There is a Huge Need for Rationalization of Coal Distribution for Uninterrupted Power Supply

During the first quarter of this year, warnings have been issued in terms of heatwaves that posed a serious threat to the country’s electricity generation. According to a report by S&P Global, India’s electricity demand increased by 8.7 percent in 2022, and on the other hand, coal generation increased by 8.7 percent causing massive emissions. Now, speaking of the higher demand, the Central Power Ministry started finding out solutions to provide ample power during the summer months.

Top 10 Mini DIY Projects for Learning Basics of Electronics

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If you are an electronics enthusiast, want to learn the basics of electronics, and improve your basics with some practicals and hands-on projects, then this article is for you. In this article, we are going to look at the top 10 mini-projects that you can build very easily and can help you understand the function and workings of different electronic components.

Smart Electronic Candle

Ordinary candles work fine but they melt away pretty fast making the place nasty, and at times if unattended, it can also lead to fire hazards. This DIY Smart Electronic Candle utilizes an LDR (Light Dependent Resistor) and an LM358 IC to create a flameless candle. When darkness falls, the LDR's resistance increases, triggering the LM358 IC, which, in turn, lights up an LED, mimicking the glow of a real candle. The circuit is calibrated using a potentiometer to adjust sensitivity, ensuring it activates in low-light conditions. Powered by a low-voltage source such as a lithium battery, this project provides a safe and aesthetically pleasing alternative to traditional candles, perfect for decorative or ambient lighting purposes.

Link: DIY Smart Electronic Candle using LDR

Fridge Door Alarm Circuit

This fridge Door Alarm Circuit is a good solution that will inform the user about the door in prolonged open. This circuit triggers the alarm if the door of the Fridge is left open for a long time. 

As soon as we open the Door of the refrigerator, LDR senses it and starts the countdown using the 555 Timer, and after a preset time, the buzzers start beeping as an alarm signal.

Link: Fridge Door Alarm Circuit using 555 and LDR

Electronic Code Lock Circuit

The 555 Timer Electronic Code Lock Circuit is a digital security system that requires pressing specific four buttons simultaneously to unlock. Utilizing a 555 IC in monostable mode, it operates without a microcontroller. When the correct combination is entered, an LED stays on for around 5 seconds, indicating access. With 8 buttons, the lock offers 40,000 unique combinations, enhancing security. The system's simplicity lies in its straightforward design and lack of complex electronics, making it an efficient and accessible solution for digital code-based locks.

Link: 555 Timer Based Electronic Code Lock Circuit

Clap Switch Circuit

The Clap Switch project is an ingenious electronic circuit that turns on a light or device in response to a clap sound. Utilizing an electric condenser microphone as a sound sensor, the circuit translates the sound energy into electrical signals. When a clap or similar sound is detected, the microphone triggers a transistor, activating a 555 timer IC. The IC, in turn, illuminates an LED for a specific duration before automatically switching it off.

Link: Clap Switch

Fire Alarm using Thermistor

The Fire Alarm using Thermistor project presents a simple yet effective fire detection system. It utilizes a Thermistor, NPN transistor, and a 555 Timer IC to sense temperature changes indicative of a fire. When the Thermistor detects a rise in temperature, its resistance decreases, triggering the transistor to turn off. This action activates the 555 Timer IC, which generates an oscillating signal to drive a buzzer. The circuit's sensitivity is adjustable using a variable resistor. 

Link: Fire Alarm using Thermistor

Battery Level Indicator using Op-amp

The "Simple Battery Level Indicator using Op-amp" project is a straightforward and effective solution for monitoring 12V batteries. Leveraging the LM324 Quad Op-amp IC, it employs a reference voltage system with Zener diodes and resistors to establish specific voltage thresholds. When compared to the battery voltage, LEDs light up to indicate the charge level, eliminating the need for complex calculations. Its simplicity and cost-efficiency make it suitable for diverse applications, such as portable electronics and automotive systems.

Link: Simple Battery Level Indicator using Op-amp

Solar Powered Cell Phone Charger Circuit

The "Solar Powered Cell Phone Charger Circuit" project offers a practical solution for charging mobile phones using solar energy. It utilizes three 5.5V 245mA Monocrystalline solar panels connected in parallel to provide a stable 5.5V and 735mA output. A 5V Boost Converter ensures constant voltage, and a switch controls the charging process. The circuit's efficiency was confirmed using the "Ampere" app, demonstrating its effectiveness in charging a mobile phone even under varying solar radiation.

Link:  Solar Powered Cell Phone Charger Circuit

Musical Doorbell Circuit

The "DIY Musical Doorbell Circuit using UM66T" project empowers enthusiasts to create a musical doorbell with minimal components, including UM66T-19L Melody Generator IC, transistors, resistors, and a speaker. This accessible tutorial guides users through assembling the circuit, utilizing a time delay feature to control the musical tone duration upon button press. The UM66T IC, operating between 1.5V to 4.5V, generates specific tunes when triggered. Transistors amplify the IC's output before reaching the 8-ohm speaker, ensuring audibility.

Link: DIY Musical Doorbell Circuit using UM66T

DIY Foam Cutter

The "DIY Foam Cutter Using the IRF540N MOSFET" project introduces a portable hot wire foam cutting tool designed for crafters and hobbyists working with Styrofoam and polystyrene. Utilizing Nichrome wire and an IRF540N MOSFET, this DIY tool offers precise control over heat, enabling intricate designs and models. The circuit features a 2S 3A Battery Protection BMS for efficient power management and longer battery life. A 3D-printed case houses the components, ensuring portability and durability. With adjustable heat settings through a 100KΩ potentiometer, users can tailor the tool to their specific needs.

Link: DIY Foam Cutter Using the IRF540N MOSFET

10. Simple Wireless Power Transmission Circuit to Glow an LED

Wireless Power Transmission Circuit

The "Simple Wireless Power Transmission Circuit to Glow an LED" project illustrates wireless electricity transfer principles using a transmitter and receiver setup. Utilizing coils and a transistor, the transmitter generates a high-frequency electromagnetic field. The receiver captures this field's energy and illuminates an LED without physical connections. While limited in power, the project showcases fundamental wireless energy transfer concepts.

Link: Simple Wireless Power Transmission Circuit to Glow an LED

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How to Address the Current Challenges in Global Semiconductor Supply Chain Ecosystem, Define Analysts

In order to meet the overall demand, the fabs capacity has been escalated to 95 percent, but they are not being able to counter the issue.

In the past two years, experts have mentioned that the chip manufacturing market has been extremely strained all over the world and the impediments in the supply chain will persist by the end of 2023 or early 2024. Semiconductor analysts have added that the production slump in this industry is not that new and they are cyclical. The production shortages can happen due to natural disasters, altering fiscal conditions, geopolitical scuffles, and  also variations in the supply of semiconductor material.

Now, over the last 2-3 years, several businesses have shifted towards just-in-time inventory strategies, which is cost-saving and effective. It is beneficial when there are no shortages in the supply chain because this just-in-time strategy helps businesses to improve their inventory storage division and saves costs as the supply chain inventory volume is reduced. When the coronavirus pandemic commenced in 2020, car-makers massively decreased their chip orders as they were under an impression that sales will decrease to a larger extent.

Although manufacturing decreased, digitization has gained more momentum and the demand for consumer electronics and IT hardware products have augmented. Therefore, the semiconductor manufacturing companies have stopped making low-cost chips and started making the expensive ones. In order to meet the overall demand, the fabs capacity has been escalated to 95 percent, but they are not being able to counter the issue.

Semiconductor Supply Chain Precompetitive Research

Tamera Max, who was associated with S&P Global as Director Technical Parts, said, "The global shutdown affected semiconductor manufacturing companies across the world, unilaterally stopping wafer production. Fabs in some countries were offline longer than others and, depending on how the production line was paused, it took weeks to months to bring a fab back online. Once a fab is online, it takes 26 weeks to fill the production pipeline from wafer start to completion."

"Wafers are processed in lots or batches that take 12 weeks to cycle through the fab (14 to 20 weeks for complex process technologies). An additional 12 to 14 weeks are required for testing, die bonding and packaging. Manufacturers prioritized the existing semiconductor inventory to fill orders, so as fabs came back online, production was already lagging demand. Longer lead times made it difficult to meet demands, and semiconductor manufacturers found that increasing capacity was not enough to make up for the difference between supply and demand," added Tamera.

Even before the COVID-19 scenario, there was a huge demand for semiconductors that was putting a huge pressure on the production units and in the logistics. It is just that the pandemic augmented that pressure in various ways. The entire supply chain was impacted both in the transportation sector and shipping and also reduced the volume of human workforce. Compared to other manufacturing sectors, the chip industry is very technical and around 25 percent of the workforce during that time was affected with the infection and quarantined.

In 2021, chip-makers and the foundries have decided to set-up 29 new chip manufacturing units and many of these top-notch fabs are located in Taiwan and in China, which is followed by Korea, Japan, and the US. Around 14 fabs commenced constructing new factories in 2021 for 300 mm technology and in 2022, another 10 fabs decided to build new units. Technically speaking, a fab construction can be completed in two years and an additional year is required to install the machinery. According to the analysts at S&P Global, around 200 fabs with 300 mm technology will be fully operational by the end of 2026. The point to be noted is that most of the chip-making firms have started building their assembly and packaging division in-house, but 80 percent of the fb units are still located in China, South Korea, Japan, and Taiwan.

Akshara Bassi, Senior Research Analyst with Counterpoint Research told CircuitDigest, "Biggest supply chain challenge for the semiconductor ecosystem is concentration of manufacturing of advanced semi chips in Taiwan. Additionally, the foundry equipment suppliers lead times to deliver fab equipment and investments required to open new fab pose challenges to expand global foundry footprint.

The countries are indulging in inshoring and allyshoring activities to bring manufacturing of chips that would help in derisking geopolitical risks with chip manufacturing. In 2023, the pricing of semiconductor components also posed a significant challenge as price erosion happened due to oversupply of components. Another risk due to global geopolitical situations are the availability of raw materials which have come under restrictions. China has restricted exports of Gallium and Germanium  or the Russia-Ukraine war impacted supply of Neon gas,” added Akshara.

And apart from the pandemic, the chipset making firms went through a lot of additional challenges, which further affected the international supply chain. For instance, in March 2021, the Renesas fabrication plant went up in flames, which halted the microcontroller manufacturing for over three months. This is extremely essential for the automotive industry. After that there was a massive ice storm in Texas in February 2022, which affected the power supply. Therefore, NXP, Infineon, and Samsung fabs failed to operate for several months. Moreover, there was a huge fire in Ukraine that affected the production of semiconductor packaging material. Most importantly, the continuous lockdowns in China reduced the volume of workforce in both electronics components and semiconductor manufacturing plants.

Projected High-Volume Fabs Starting Construction Graph

Highlighting the challenges of global semiconductor supply chain issues, Anku Jain, managing director of MediaTek India said, “The demand of semiconductor chips soared five to seven years prior to the COVID. This is mostly due to rising demand for consumer electronic items, smartphones, cars, and IT hardware products. COVID has just increased the demand to a certain extent. The global semiconductor companies and the foundries have done exceptionally well to increase production rate within a very short span of time. After a massive pandemic scenario, it’s a commendable task by both the manufacturers and the government. In the coming two years, the situation will not only return to normalcy, but the volume of production will increase by two-folds.

While speaking of the entire international semiconductor supply chain, it is important to understand that chipsets are extremely intricate to manufacture and design. There are no sectors, which same amount of investments in both R&D and capital expenditure. The requirement for in-depth technical knowledge and scale has helped in forming a massive global supply chain in which every country performs different functions. For example, the US spearheads the R&D based activities such as electronic design automation (EDA), core intellectual property (IP), chip design, and advanced manufacturing equipment. While the East Asian countries are extremely brilliant in wafer fabrication that requires huge capital investments backed by the government schemes and initiatives. China is at the forefront in assembly, packaging, and testing (ATMP), which does not require much proficiency and investments.

A media report has also added that in the coming ten years, the global semiconductor industry will have to have an investment of $3 trillion in R&D and capital expenditure. In an effort to meet the same, both the government and the industry leaders will have to work together to provide state-of-the-art access to markets, talent, technologies, capital, and make the supply chain more sturdy. Throughout the supply chain, there are about 50 points where one country has more than 65 percent of the international market share. When we speak about the overall semiconductor supply chain, manufacturing is the key. According to a report of Semiconductors Industry Association (SIA), around 75 percent of manufacturing units and suppliers of important materials are located in East Asia and China.

Both the regions are surrounded with geopolitical tensions and high seismic activity. Moreover, the cutting-edge semiconductor manufacturing capacity in 10-nm nodes are concentrated in Taiwan (92 percent) and South Korea (8 percent). To counter the challenges of international supply chain imbalances, governments must unleash market oriented incentive schemes that will help in setting-up more production units, especially in the US as well as expanding the volume of manufacturing sites and supply sources for critical components and equipment. 

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CDIL will be the First Company in India to Introduce Silicon Carbide based Products in the Country Soon

Around ten years back, there was a huge challenge in India in the ESDM and semiconductor manufacturing ecosystem mostly due to lack of proper policies by the government, concentration in the software ecosystem, and most importantly, there is no proper education about the importance of the ecosystem. Now, the government has undertaken various initiatives and unleashed schemes such as Production Linked Incentive (PLI), Scheme for Promotion of Manufacturing of Electronic Components and Semiconductors (SPECS), FDIs etc to boost the industry.

The Imperious Historical Facts that Forced India to Move Generations Behind in Semiconductor Manufacturing

India lost the semiconductor growth race during the late 1980s. But, for the past five to six years, the government has unleashed various schemes, initiatives, and educational programs to boost chip fabs and design. Investments are happening, but there are a couple of grave impediments such as lack of proficient workforce and infrastructures. Currently, it is difficult to compete with countries like the USA, Vietnam, China, and South Korea as they have better policies, subsidies, and cost-efficiency. Apart from huge investment, chip fabrication units require gallons of pure water and uninterrupted power supply.

However, there is a constant price pressure from various international players, mostly China, which is forming an in-house semiconductor program by which 70 percent of locally manufactured chips will be used in all its products by the end of 2025. Industry experts from various associations have stated that India has done exceptionally well in the area of electronics manufacturing and chip design, but now it is the time to set-up more chip fabrication and manufacturing facilities.

Anurag Awasthi, Vice President, Policy, Government Corporate Relations at India Electronics and Semiconductor Association (IESA) said that skilling is always an important requirement to fulfill the goals of Atmanirbhar Bharat. He told CircuitDigest, “The important policies such as SPECS, DLI, and PLI will boost in-house design, manufacturing, and assembly. But, the point is self-reliance in manufacturing, skilling, distribution, and design. Amid the current subsidies proclaimed in Europe and in the US, and the unleashing of the CHIPS Act, Asia will dominate the global market as it has the expertise and the resources to control the volumes of semiconductor production. In an effort to boost economies of scale, a couple of global Asian firms are setting-up their production units in other countries, but it will take more time as the process is intricate and time-consuming.

Awasthi added, “Europe and East Asia are now spearheading the R&D, South Korea and Taiwan dominating the manufacturing/OSAT, and China with a history of monopoly market leading the testing and packaging industry. The international value chains in this domain have crumbled. No country is a central location of all the semiconductor processes, and hence the hurdles in this sector are conspicuous.

Semiconductor Chip

Why India Lost The Semiconductor Growth Journey During The Late 80s- A Historical Perspective.

In an article with the Statesman, Independent Journalist CHOODIE SHIVARAM said that before 1987 India was progressing in this sector at a large-scale and today, it should have its own semiconductor fabrication units. Now, the worst part is that the nation is twelve generations behind. There are some unforgivable reasons due to which India missed the bus numerous times such as bureaucratic lassitude, lack of leadership with a clear vision, improper infrastructures, and corruption. When the silicon revolution started happening during the early 1960s, Fairchild Semiconductor announced to set-up a fab, but bureaucratic fatigue helped them to move to Malaysia. A couple of months after the 1962 Indo-China war, Bharat Electronics Ltd. started a new fab to produce germanium and silicon based transistors.

The demand for these transistors were so high various global companies were lined up to place orders. This is when the cost-efficient integrated circuits (ICs) from Taiwan, South Korea, and China dominated the Indian market and BEL could not compete with the quality and price standards. Several fab units were forced to shut down. In the mid 1980s, there was another revolution in this sector when IISc professor A.R. Vasudeva Murthy in association with BEL formed Metkem Silicon Limited to manufacture polysilicon wafers for electronics and solar cells. Devoid of any proper policies, incentives, schemes, and lack of subsidized power, Metkem failed to manufacture top-notch polysilicon wafers.

Faisal Kawoosa, senior research analyst and founder at techArc said, “The point to be noted is that the country’s semiconductor journey already commenced way back in late 60s. Interestingly, Semiconductor Complex Ltd (SCL) was formed in Mohali in 1976 and started operation in 1984. Initially, the company started functioning with 5,000 nm chips and 800 nm cutting-edge technology and that was the time when countries like Taiwan and China could not even think of competing with India in this sector. In 1989, when a major fire incident broke out in the plant, the country suffered a massive setback. The mysterious fire ruined billions of dollars worth imported equipment and there was a colossal loss of Rs 60 crore.

This is when India’s dream of leading the semiconductor industry shattered into pieces. The intelligence bureau carried out a detailed investigation, but the reasons are yet to be revealed. If all these companies survived until now then, the country could have been the leading destination of chip manufacturing design and there would be no dependence on China, Taiwan, South Korea, and Vietnam,” added Kawoosa.

A media portal, Organizer Weekly, clearly stated that the UPA government never took the matter seriously of growing the semiconductor industry. Numerous global companies started operating their units in the southern parts of India in 2005, but these companies faced immense challenges in terms of the manufacturing equipment as they were to be imported from the US. In the end of 2013, the World Semiconductor Council penned a letter to the then government for possible cooperation. There were no subsidies and incentives given by the government to these companies and moreover, a huge import duties were also charged. This is when China again played the game of monopoly business and capitalized on this front by providing all kinds of financial assistance to global companies to start manufacturing in their country.

In an effort to meet the escalating demand, both European and the US semiconductor firms have carefully analyzed the Indian design talent and used the facilities in Taiwan for mass production, claims science commentator Dinesh C. Sharma. SCL, again failed to fully commence its manufacturing facility again, but nonetheless during the time of technological proscription, the company started producing chips for strategic ventures in defense and aerospace. Basically, after 1989, the business dynamics have altered all over the globe and the fact is that technology and equipment in this industry changes very rapidly. In India, the in-house demand was very poor and ample investments were not being provided.

Highlighting the historical aspects of India’s semiconductor industry growth, Minister of state for skill development & entrepreneurship and electronics & IT Rajeev Chandrasekhar ahead second edition of Semicon India 2023 event told the media that India missed the semiconductor bus due to lack of vision, clear strategy, and clarity by the previous governments. Speaking to the media prior to the conference, the minister added that the current government has made a lot of progress in this sector.

Semiconductor Chip Manufacturing

How India Is Now Aiming To Lead The Chip Manufacturing Race In The Coming Ten Years

After monitoring and analyzing the current challenges, the US based global firm Intel back in 2014 ignored to set-up its production unit in the country. Then, the government has started unleashing various schemes such as Scheme for Promotion of Manufacturing of Electronic Components and Semiconductors (SPECS), National Policy On Electronics (NPE), Modified Special Incentive Package Scheme (M-SIPS), and the much-awaited semiconductor incentive scheme of Rs 76,000 crore has been approved by the government back in December 2021 to boost semiconductor industry growth.

According to a previous report of CircuitDigest, the government has earlier notified that they are likely to approve another Rs 25,000 crore scheme to grow chip manufacturing. Under the Modified Semicon India Program, the fresh new applications were being invited by the union government from Jun 1, 2023 onwards in an effort to grow the nation’s display and semiconductor fabs. India Semiconductor Mission (ISM) will receive the applications and is tasked with leading the nations’ $10 billion semiconductor manufacturing program.

On Jul 21, 2023, in a written response to the Rajya Sabha, Rajeev Chandrasekhar has approved the beginning and restructuring of SCL Mohali again and he aims to turn it into a brownfield semiconductor manufacturing facility. And on the same day, the Odisha cabinet ministry has also approved the state’s semiconductor manufacturing and fabless policy by which the state cabinet is looking forward to magnetizing global investors and set-up electronics/chip manufacturing unit in the eastern front of the state. Speaking of this policy, the state is anticipating at least one chip producing unit and scores of fabless design operations.

Other than this, Rapidus Corporation, Japan's chip manufacturing firm has formed an MoU with the Indian government recently and then as per the recent report of the Economic Times, HCL group has also proclaimed its intention to set-up an assembly, testing, marking, and packaging (ATMP) unit with an investment around US$200-300 million. Now, although Foxconn canceled its $19.5 billion JV with Vedanta, both the companies announced plans to form its own chip unit. And last but not least, the US based Micron Technology has finally signed an agreement with the Gujarat government for setting-up a chip production facility with an investment of US$2.74 billion. The manufacturing unit will commence its operations in just eighteen months and it will provide direct employment to 5,000 people.

Speaking of the semiconductor growth in the coming decades, Amrit Manwani, managing director at Sahasra Group of Industries said, “The semiconductor industry is growing in India at an extraordinary level. By the end of 2026, the chip market in the country will reach around 55 billion that will augment at a CAGR of 20 percent from the period between 2022-2026. Now, speaking of the historical factor, the growth rate could have been tripled if we could have maintained that momentum and pace from the early 70s. As an entrepreneur I feel during that time, there was a lack of education and programs about how important industry electronics and semiconductors are in the future.

Conclusion

When we speak of India turning into a global manufacturing hub for chips, there is a huge scarcity of talent and skilled workforce. And obviously, the period after 1987 until 2014 was a big hindrance in boosting the growth of the industry. The nation has faced various challenges in setting-up fabrication facilities required for large scale manufacturing. Now, with the increased pace of digitization and the growing demand for electronic products, India is still a huge importer of computer and memory chips and a couple of industry insiders have opined that the country is investing more on chip imports than oil. Obviously, to decrease that import reliance, India must find ways to develop semiconductor manufacturing for which both the union and the state governments must unveil impeccable policies, infrastructures, initiatives, and schemes crafted for scalable manufacturing. In order to meet the same, the nation can carefully analyze the case studies of the Asian country markets.

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Evolving Battery Management Systems

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Lithium battery systems are increasingly moving to higher capacity and increased voltage levels as the trend toward electrifying mobility, tools, and industrial equipment continues. Though excellent for enhanced mobility and productivity, these higher battery cell counts and voltage levels mean that battery management system (BMS) technology needs to advance to accommodate this trend. Given the complexity, increased cost, and safety requirements of the latest electrified devices and equipment, BMS must also have greater capability and features for enhanced communication functions, fuel gauging, cell balancing, timing, and accommodating various lithium battery chemistries.

Primer On Lithium Battery Technology

Lithium batteries are energy storage devices stored within chemicals that are trapped in battery cells with a positive electrode (cathode) and a negative electrode (anode). Lithium-ion batteries are based on materials with layered crystalline structures where the lithium ions can migrate between layers, known as intercalation compounds. The discharge cycle of a lithium-ion battery sees the lithium ions migrate from the anode to the cathode, which induces electrons to move in an opposing direction from the cathode to the anode. This allows for energy transfer for the battery's terminals and the electrical load. The voltage level and current output at the lithium battery terminals depend on the number of lithium ions that are migrating. When voltage levels begin to sag, the current is reduced, as the number of lithium ions available to migrate decreases.

The charge cycle of a lithium battery works in the opposite way, where inducing a voltage at the terminals of the lithium battery causes the lithium ions to reverse their migration across the electrolyte and re-embed within the negative electrode. Modern lithium batteries can be made of a variety of different intercalation compounds for the cathode, the most common being lithium-ion (li-ion), lithium-ion polymer (LiPo), and lithium iron phosphate (LiFePO4). The negative electrode of lithium batteries is often graphite. However, ongoing experimentation and efforts exist to develop higher performing batteries using various anode, cathode, and electrolyte materials and technologies.

Given the highly reactive nature of lithium batteries, it is necessary to monitor the batteries' temperature, current, and voltage characteristics during charging and discharging. Without proper battery monitoring and control, a lithium battery cell, even if it is made of "safer" or more stable lithium compounds, may reach a state of thermal runaway. This runaway could cause damage to the cell electrodes or housing, possibly leading to an uncontrolled chemical reaction where the battery cells could catch fire or even explode.

Many lithium battery systems are composed of several lithium battery cells in series to reach higher voltage levels and in parallel to achieve higher current output levels. Given the tolerances in fabrication, inconsistent aging of lithium batteries, and many other factors, the discrepancies between the battery voltage and current characteristics can result in several possible performance degradations or battery damaging conditions. For instance, if a battery cell is in series or parallel to other lithium battery cells and isn’t performing to specification, that cell may act as a load. This results in the degraded battery drawing current, while the voltage of the other cells may be reduced below a safe threshold.

These discrepancies are why cell balancing technology is critical in lithium batteries with more than one cell. Systems that incorporate battery monitoring, control, and cell balancing are commonly known as battery management systems (BMS). As lithium battery technology has advanced and become more widely used, BMS technology has also advanced to ensure greater safety, performance, and longevity for lithium battery systems (Figure 1).

Battery Management System Block Diagram
Figure 1: High-level diagram of a battery management system (BMS) for lithium battery technologies. (Source: Qorvo)

Trends in New Lithium Battery Systems

For many power garden tools, construction tools, mobility, and industrial equipment, gasoline and corded electric systems have dominated the markets for over a century. However, the developments in lithium battery technology have led to the transcendence of electric battery-powered tools for everything from mobility to equipment to everyday necessities. Examples include battery electric string trimmers, blowers, chainsaws, SDS drills, scooters, e-bikes, motorcycles/mopeds, concrete saws, and portable welders. These battery electric systems are commonly made with 20V, 40V, 60V, and 80V, with higher voltage levels likely becoming popular.

The success of battery-operated tools and mobility systems naturally results in even higher performance, which necessitates increasing the voltage levels, capacity, and current capability of the lithium battery systems powering these devices. Due to lithium technology's cell voltage level limits, increasing the number of cells in series is the only way to reach higher voltage levels. Drawing too much current from or dumping too much current into a lithium cell can result in cell damage and catastrophic failure. Increasing the current output/input capability will increase the number of lithium cells in parallel. Therefore, enhancing the overall capacity of a lithium battery system may require even greater numbers of parallel series of cells or much higher capacity lithium battery cells.

Intelligent BMS Step Up to Meet the Challenge of Modern Lithium Battery Systems

Given that lithium battery systems are being developed to push the performance of battery electric systems for various applications—from electric vehicles (EVs) and electric backup generators to autonomous mobile robots—BMS technologies must also advance to accommodate these new higher voltage levels, capacity, and current input/output battery systems.

Qorvo's intelligent BMS (PAC22140/PAC25140), with an integrated microcontroller unit (MCU) and cell balancing technology (Figure 2), is a natural evolution of simple BMS that merely monitored the battery and shut off charging when either temperature or voltage levels reached unacceptable thresholds. These new BMS chips can monitor 10-series (10S) to 20S li-Ion, Li-Polymer, and LiFePO4 battery packs, including the most common lithium battery technologies. Qorvo’s new BMS include a FLASH-programmable MCU (Arm® Cortex®-M0) with power management, current/voltage/temperature sense, drive circuits for charge/discharge FETs, and protection fuses. Moreover, these intelligent BMS also include built-in UART/SPI, I2C/SMBus, and even CAN communication on some units.

Features of Qorvo Intelligent BMS
Figure 2: Feature set of Qorvo Intelligent BMS with an integrated microcontroller unit (MCU) and cell balancing. (Source: Qorvo)

Since it is essential to evaluate new BMS chips and familiarize oneself with their programming and control aspects, Qorvo provides an evaluation kit (PAC22140EVK1 and PAC225140EVK1) for these chips.

These evaluation kits are complete hardware solutions for evaluating the new intelligent BMS devices and also enable solution development with access to all of the device's signals and all the necessary circuitry to energize the MCU and internal peripherals (Figure 3).

Qorvo PAC22140EVK1 evaluation kit
Figure 3: Qorvo PAC22140EVK1 evaluation kit used to develop an intelligent BMS for a 10S lithium battery pack. (Source: Qorvo)

Conclusion

The growth in popularity and utility of lithium battery electric systems has pushed the boundaries on voltage, capacity, and current capability. With greater series cell counts and higher user performance expectations, these new battery electric systems must be appropriately managed and cell-balanced with the latest intelligent BMS technology. Qorvo's new intelligent BMS technologies aid in developing new BMS solutions that augment present lithium battery technology with more efficient cell balancing, monitoring, and protection features.

Original Source: Mouser

About the Author

Principal of Information Exchange Services: Jean-Jacques DeLisle Jean-Jacques (JJ) DeLisle attended the Rochester Institute of Technology, where he graduated with a BS and MS degree in Electrical Engineering. While studying, JJ pursued RF/microwave research, wrote for the university magazine, and was a member of the first improvisational comedy troupe @ RIT. Before completing his degree, JJ contracted as an IC layout and automated test design engineer for Synaptics Inc. After 6 years of original research—developing and characterizing intra-coaxial antennas and wireless sensor technology—JJ left RIT with several submitted technical papers and a US patent.

Further pursuing his career, JJ moved with his wife, Aalyia, to New York City. Here, he took on work as the Technical Engineering Editor for Microwaves & RF magazine. At the magazine, JJ learned how to merge his skills and passion for RF engineering and technical writing.

In the next phase of JJ’s career, he moved on to start his company, RFEMX, seeing a significant need in the industry for technically competent writers and objective industry experts. Progressing with that aim, JJ expanded his companies scope and vision and started Information Exchange Services (IXS).

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We Need To Encourage Building Hands-on Electronics Projects and should build the Ecosystem for the Same

Over the past few years, India has escalated its in-house production of electronic products, but in spite of that growth, import of these items, mostly components, continued at the same volume. The picture shows that there are various impediments in the sector, which still needs to be addressed like the companies must manufacture finished goods in large quantities and at competitive prices. Also, there is a lack of investments in producing ICs, irregular power supply, supply chain disruptions, and many more.

Giving Voice to Smart Products

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‘It is not only about what you say. It is also about how you say it.’ This old-age adage quite aptly sums up the need for human beings to communicate effectively with each other. The necessity of humans to interconnect with one another through voice and sounds has presented a future where communication with machines has become inevitable.

A key enabler for the increasing adoption of voice communication has been accelerated with the expansion of the Internet of Things (IoT) and artificial intelligence (AI). Integration of AI at the endpoint— combined with advances in voice analytics—is changing the availability of products, and the consumption of product experiences are giving rise to a new ecosystem of companies that are participants and enablers of these products. Intelligent endpoint solutions are making it possible to implement both online and offline systems, reducing reliance on always-on internet/cloud connections. This, in turn, is creating new opportunities to solve many challenges related to real-time voice analytics across several consumer and industrial applications. The advances in psycholinguistic data analytics and affective computing make allowance for inferring emotions, attitudes, and intent with data-driven voice modeling. With the voice medium becoming a natural way for humans to interact, it will lead to improvements in measuring intent from voice recognition and voice analytics.

Challenges of Using VUIs

Voice user interfaces (VUIs) allow the user to interact with endpoint systems through voice or speech commands. Despite mass deployments across a wide range of applications, VUIs have some limitations.

  • Poor sound quality: Inconsistent sound quality with continued background noise can make voice recognition a challenge. Voice controllers in IoT can only operate flawlessly if the sound is crystal clear, which is a formidable task in a noisy environment. A voice-enabled assistant can only be truly effective if it is able to support different languages and accents, as well as isolate the human voice from the background noise.
     
  • Power consumption: Voice Command systems are restrictive as they require the activation of at least one microphone as well as the processor that recognizes the wake word.
     
  • Real-time processing: Slow or congested networks can result in command latencies that can impact the user experience. This issue may be addressed by implementing distributed intelligence at the endpoint with the ability to process the voice command in real time without any reliance on the centralized cloud system.
     
  • Accuracy and noise immunity: Voice recognition accuracy and background noise immunity are always major concerns when designing any VUI system. Voice recognition presents a number of challenges as there can be multiple sound sources, including interior and exterior noise and echoes from surfaces in the room, etc. Isolating the source of a command, canceling echoes, and reducing background noise require sophisticated technology depending on multiple microphones, beamforming, echo cancellation, and noise suppression.

Renesas Electronics provides general-purpose MCUs enabling VUI integration without compromising performance and power consumption.

Requirements for Robust Voice Recognition

To make the experience compelling for the user, devices need to be equipped with several components to ensure robust voice recognition.

Command Recognition

One of the most significant features of a voice-enabled device is its ability to identify speech commands from an audio input. The speech command recognition system on the device is activated by the wake word, which then takes the input, interprets it, and transcribes it to text. This text ultimately serves the purpose of the input or command to perform the specific task.

Voice Activity Detection

Voice activity detection (VAD) is the process that distinguishes human speech from the audio signal and background noise. VAD is further utilized to improve the optimization of overall system power consumption otherwise; the system needs to be active all the time, resulting in unnecessary power consumption. The VAD algorithm can be subdivided into four stages (Figure 1):

VAD algorithm block diagram
Figure 1: The block diagram specifies the four stages of the VAD algorithm: noise minimization, segregation, classification, and response. (Source: Renesas Electronics)

The Renesas RA voice command solution built on the RA MCU family and partner-enabled voice recognition MW boasts a robust noise reduction technique that helps in ensuring high accuracy in VAD. In addition, Renesas can help to address some of the key voice command features outlined below:

Keyword Spotting

Keyword spotting systems (KWS) are one of the key features of any voice-enabled device. The KWS relies on speech recognition to identify the keywords and phrases. These words trigger and initiate the recognition process at the endpoint, allowing the audio to correspond to the rest of the query (Figure 2).

keyword spotting process
Figure 2: The diagram illustrates the keyword spotting process, which relies on speech recognition to identify the keywords and phrases, the identified keywords and phrases triggering and initiating the recognition process at the endpoint, and allowing the audio to correspond to the rest of the query. (Source: Renesas Electronics)

To contribute to a better hands-free user experience, the KWS is required to provide highly accurate real-time responses. This places an immense constraint on the KWS power budget. Therefore, Renesas provides partner-enabled high-performance optimized machine learning (ML) models capable of running on advanced 32-bit RA microcontrollers. They come with pre-trained DNN models, which help in achieving high accuracy when performing keyword spotting.

Speaker Identification

Speaker identification, as the name suggests, is the process of identifying which registered speaker has the given voice input (Figure 3). Speaker recognition can be classified as text dependent, text independent, and text prompted. To train the DNN for speaker identification, individual idiosyncrasies such as dialect, pronunciation, prosody (rhythmic patterns of speech), and phone usage are obtained.

Speaker ID System Block Diagram
Figure 3: Speaker identification system block diagram illustrates the process of training the DNN for speaker identification and individual speech idiosyncrasies. (Source: Renesas Electronics)

Voice/Sound Anti-Spoofing

Spoofing is a type of scam where the intruder attempts to gain unauthorized access to a system by pretending to be the target speaker. This can be countered by including anti-spoofing software to ensure the security of the system. The spoofing attacks are usually against Automatic Speaker Verification (ASV) systems (Figure 4). The spoofed speech samples can be generated using speech synthesis, voice conversion, or by just replaying recorded speech. These attacks can be classified as direct or indirect depending on how they interact with the ASV system.

  • Direct Attack: This can occur through the sensor at the microphone and transmission level and is also known as Physical Access.
     
  • Indirect Attack: This is an intrusion into the feature extraction, models, and the decision-making process of the ASV system software and is also known as Logical Access attack.
Automatic Speaker Verification Block Diagram
Figure 4: Block representation of an automatic speaker verification. (Source: Renesas Electronics)

Multi-Language/Accent Recognition and Understanding

Accent recognition in English-speaking countries is a much smoother process due to the availability of training data, hence accurate predictions. The downside for organizations operating in countries where English is not the first language is less precision with speech recognition due to the availability of a limited amount of data. An inadequate amount of training data makes building conversational models of high accuracy challenging.

To overcome the accent recognition issue, Renesas offers a VUI partner-enabled solutions that support more than 44 languages, making it a highly adaptable speech recognition solution that can be used by any organization worldwide.

Original Source: Mouser

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Amid Recessions and Supply Chain Disruptions, How Europe will Lead The Global EV Market

In the quarter one of 2023, sales of battery powered electric cars increased by 32 percent YoY, but there is a sales decline of plug-in hybrid EVs by 13 percent YoY

A latest survey report has now mentioned that the growth in sales of electric vehicles in the European region has escalated by 13 percent YoY in Q1 of 2023. Now, when the entire sales of cars are taken into consideration, there are massive signs of growth and improvement in the region, although they are yet to meet the target like the pre-pandemic levels, claim experts. If the total EV sales are taken into account, Germany is spearheading the segment, which is then followed by the UK, France, Italy, Netherlands, and Norway. Speaking of sales of the passenger cars segment in EVs, the highest growth was observed in the Netherlands and Norway.

The point to be noted is that in the quarter one of 2023, sales of battery powered electric cars increased by 32 percent YoY, but there is a sales decline of plug-in hybrid EVs by 13 percent YoY. It was also observed that the EV market share of passenger vehicle sales reduced drastically in Q1 2023 as compared to that of Q1 2022. A counterpoint survey report has further highlighted that there has been a huge improvement and development in the EU region for hybrid EVs and mild-hybrid EVs. This provides a crystal clear picture that Europe has been busy in unleashing a lot of schemes and initiatives to capture the lower-end electric car market, while at the same time, it is developing the battery infrastructure and craving for a circular economy. These initiatives are already given high priority much before putting a solid emphasis on genuine EV sales.

Sohinder Gill, CEO at Hero Electric India said, “Currently, it is right to say that vehicles powered by batteries are leading the automotive market. Amid the coronavirus pandemic and the ongoing supply chain imbalances, the growth in EVs are still significant. The current impediments and augmenting production prices due to escalating raw material prices, electric cars sales are still moving at a rapid scale. Now, if the pace continues at the same level, then very soon this segment will wipe out the sales growth of conventional ICE vehicles. If you see the market in 2020, EV sales have increased by two folds in 2021 with an increasing rate of 108 percent. Ultimately, it has helped EVs sales to have 5 percent of international passenger car sales in 2021.

In 2021, when strict lockdowns were imposed throughout the world, China still topped the list in highest number of EV sales, which is around five times more than Germany. There are a couple of imperative factors that have helped China to lead the EV sales that includes massive subsidies on EVs, a huge variety of mini electric cars, and more cost-effective varieties are appearing in the market. What’s interesting about China is that around 3.3 million electric cars were sold in China in 2021 and during the same year, the fleet of EVs in the country stood at 7.8 million. The stock of electric cars are actually double the volume in 2019 and during the same period around 2.7 million BEVs were sold, which accounts to 82 percent of the new electric car sales.

Europe’s EV market share reached 66 percent between 2020 and 2021, and the sales share of plug-in hybrid EVs witnessed the largest in the globe. The European EV market is driven by purchase incentives and schemes, a huge variety of models, and market evolution. The growth is expected to increase more in the coming years due to Eu nation’s strict adoption of Co2 emission standards and also magnetizing zero emission vehicle standards. Although the EV market is growing massively in the EU, it is still limited to a part of the region. Speaking of the overall EV sales competition, the US, China, and Europe account for 95 percent of the market, while the other parts of the world including India are still facing challenges to come close to it. The major challenges other countries witnessed are mostly lower subsidies by the government on manufacturing and purchase of EVs, lack of proper charging stations, and extremely high prices of the vehicles.

BEV vs PHEV sales share chart

According to an exclusive report of the International Energy Agency, in 2021 EV sales augmented by more than 65 percent YoY, which is around 2.3 million. The sales remained solid in the region in spite of the fact that the global automobile market is yet to recuperate from the pandemic. The period of five years between 2016 until 2021, sales of the electric cars in the Eu region increased by a CAGR of 61 percent, which is larger than China 58 percent and the US 32 percent. The global automobile experts opine that the distribution is bumpy throughout the EU nations. Germany still holds the record of highest number of EVs sold in the region, which is around 25 percent. The highest market share for new electric car sales in 2021 in Europe are Norway (86%), Iceland (72%), Sweden (43%) and the Netherlands (30%), followed by France (19%), Italy (9%) and Spain (8%).

Now, speaking again of the EV sales in Q1 2023, the market is dominated by top five automobile firms such as Volkswagen, Tesla, Stellantis, Mercedes Benz, and Hyundai-Kia. All these companies accounted for nearly two-thirds of the market share. While speaking of genuine electric cars, Tesla grabs the second spot and is a bit behind Volkswagen. In terms of PHEV market, Volkswagen again tops the chart and is followed by Mercedes Benz and BMW. At this moment, the EV makers in China are facing a lot of challenges to perk-up their market in the EU region in this quarter. Nonetheless the chinese companies such as Aiways, NIO, BYD, Ora, and MG slightly managed to augment their share as compared to the preceding year. But, companies such as Xpeng, LYNK & Co, and Hongqi faced hurdles in the EU market. Experts anticipate that the Chinese EV manufacturers will be able to increase their sales share in the EU nations in the coming quarters by providing affordable vehicles with cutting-edge features and this because the EV market is speculated to perform better.

Highlighting the growth of EVs in the European market, senior automobile research analyst at Counterpoint Research Peter Richardson said, “In the current quarter, the overall penetration of electric cars in passenger vehicles sales slumped by 18.4 percent from the previous 27.6 percent in Q4 2022. This shift is considered to be notable compared to the earlier trend of continuous Quarter on Quarter growth. Now, other than France, all the major nations in the EU witnessed the growth slump.

electric car registration graph

Richardson further added, “There are a couple of reasons that have boosted this revenue slump. The financial conditions were very unsteady and because of Norway’s removal of the EV subsidy scheme. In Europe, Germany has the biggest market share of EVs, which also witnessed a revenue decrease because of the ongoing recession and lesser consumer spending. But from April 2023, the market in the EU has started observing signs of growth and therefore, it is speculated that EV’s share will increase more than 25 percent towards the end of this year.

The point to be noted is that throughout the four countries, the price factor is very important. This is because battery powered cars are so expensive which is why it failed to gain the desired traction among the European consumers. Around 60 percent of the citizens are still hesitant to opt for EVs and the number has massively escalated in Germany from 40 to 61 percent, and the Netherlands from 54 to 66 percent. Secondly, the possibility of not finding ample charging stations and the worry regarding the presence of low charging ports has also increased by 5 percent. Also, four out of 10 Europeans still think EVs take more time than conventional gasoline vehicles.

Rohit Pandit, managing director at Shuzlan Energy told CircuitDigest, “Currently, everything in the European countries now depends on the commitment made in the Paris agreement. Currently, in Europe, the market for EVs are now mandatory and compulsory. They are constantly making numerous efforts to meet the goal unlike India and this is why Eu is moving forward. The infrastructures are being built stupendously and the subsidies and incentives are also very high. In India, there are a lot of bottlenecks as we have started the initiative very late and we face immense challenges while working on the ground.

In the past few years, various countries in Europe have been provided with fiscal incentives like taxation exemptions for the consumers who choose to purchase an electric car. The government of France also offers incentives of up to €5,000 to help people purchase electric vehicles, which are powered by hydrogen, electricity or the amalgamation of both. In the EU, the transport sector is the largest contributor of carbon emissions and hence, the commission in Europe barred selling of ICE vehicles by 2035.

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Shuzlan Energy to install around 750 AC and DC Chargers across Country based on Captive Charging Model

The electric vehicle ecosystem has been growing in India tremendously over the past few years owing to various schemes and initiatives unleashed by the government. But, in our country, charging infrastructure is not growing upto the expectations. The lack of convenient and wide range of charging networks makes it very intricate for EV owners, especially for those living in apartments or without a proper parking area.