As the core components that make up power electronic conversion devices, power semiconductors support the modern technology ecosystem. With the emergence and development of new application scenarios, the application scope of power semiconductors has expanded from traditional consumer electronics, industrial control, power transmission, computers, rail transportation and other fields to the Internet of Things, new energy vehicles and charging, intelligent equipment manufacturing, Emerging application areas such as cloud computing and big data.

Power semiconductors in mainland China started relatively late. After years of policy support and the efforts of domestic manufacturers, most of the low-end devices have been localized, but the mid-to-high-end products are monopolized by international companies, and the degree of localization is low. The main reason is that with the development of the semiconductor industry, the consistency requirements of the manufacturing process are getting higher and higher, which leads to an increase in the manufacturing difficulty index; the semiconductor industry needs a lot of basic physical research, and the early basic research in China is extremely weak, lacking experience accumulation and talent precipitation.

As early as 2010, Yunyi Electric (stock code 300304) began to deploy high-end power semiconductors, positioned itself in the high-end market, introduced advanced technical teams at home and abroad, and focused on the research and development of TVS products in the automotive field. To do the hardest thing to do, to gnaw on the hardest bone, to become an “industry leader” has become the gene of the Yunyi Semiconductor team. After two years of unremitting efforts from 2012 to 2014, the team overcame various problems and finally achieved a technological breakthrough: successfully mastered the world’s leading two core processes of “chemical split” and “polyimide chip protection”, thus becoming the only company in China. A design company that can apply two advanced technologies to mass-produce core power devices at the same time is also the first to enter the manufacturing company of automotive-grade power semiconductors.

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“Chemical Fragmentation”

1. No damage: The world’s leading chemical method is used for splitting. Compared with traditional mechanical cutting, chemical splitting technology eliminates cutting stress and avoids chip damage;

2. High reliability: The chip is designed as R-angled hexagon or round, which will not produce tip discharge, which improves product reliability;

3. Low cost: For the hexagonal honeycomb design, the output of the chip is increased under the same wafer area, and the cost advantage is realized.

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“Polyimide Chip Protection”

1. Anti-brittle cracking: Polyimide is an insulating adhesive material, and it is used to protect the chip, which is not easy to be brittle and cracked compared with the existing glass protection in the industry;

2. Impact resistance: Polyimide has good elasticity and is resistant to high and low temperature impact;

3. Low leakage: Polyimide has strong adhesion and small leakage current;

4. No warping: The polyimide curing temperature is low, and the wafer is not easy to warp.

In addition, the commonly used diode chips on the market are GPP chips. GPP chips use glass passivation technology, and glass is a brittle material, which is prone to cracks during chip fabrication, packaging and application, thereby reducing the reliability of the product. Based on this, the Yunyi Semiconductor team has developed a new type of chip that adopts organic passivation technology, which can improve the reliability of the chip on the one hand, and reduce the leakage current of the chip on the other hand.

The zero-defect quality goal requires not only advanced technology, but also strict quality system guarantee:

In 2014, the Yunyi Electric Semiconductor team and Valeo joined forces to strictly upgrade the existing production system, passed the Valeo VDA6.3 audit with a high score of 93, and established a strategic partner relationship; since 2017, more than 80% of Valeo’s power semiconductors in China have come from Yunyi, making it the largest supplier of Valeo in China;

In 2019, the Yunyi Semiconductor team launched the DO-218 automotive product series, which was highly praised by the industry as soon as it was launched, and its load-dumping capability surpassed that of many international semiconductor giants, breaking the monopoly of Europe and the United States in the global market;

In 2020, Yunyi Semiconductor successfully passed the SEG product verification and became its preferred supplier in China.

In 2022, more than 75% of the semiconductors in the national automotive generator OE market will come from Yunyi Semiconductor. The recognition of customers and the affirmation of peers also constantly urge Yunyi Semiconductor team to innovate and move forward. With the rapid development of the new energy vehicle industry in the future, IGBT and SIC will also usher in a broad space for growth. Yunyi Semiconductor has become the first high-end semiconductor R&D and production company to enter automotive-grade applications, and has become a leader in the localization of semiconductors in the high-end field.

In order to break through the dominant pattern of Europe and the United States in the global power semiconductor market, Yunyi has increased its investment in the semiconductor field again. In May 2021, it formally established Jiangsu Zhengxin Electronic Technology Co., Ltd. The first-phase investment is 660 million yuan, the plant area exceeds 40,000 square meters, and the annual output value is 3 billion yuan. The intelligent production line with Industry 4.0 standards is a complete system that integrates OT operation technology, IT digital technology and AT automation technology. Through the CNAS laboratory, AEC-Q101 vehicle-level reliability verification, to achieve a high degree of integration of design and manufacturing.

In the future, Zhengxin Electronics will still focus on the high-end semiconductor market, expand product categories, introduce senior talents at home and abroad, give full play to the world’s leading technological advantages, master the internal structure design of independent intellectual property rights, rely on the parent company Yunyi Electric (stock code 300304) 22 Years of industry experience in the automotive field, vertical integration of the industry chain, and go all out to lead the development of China’s power semiconductor industry.