The common server function is a type of computer that receives service requests submitted by other client terminals on the network and responds, and is characterized by strong processing capability, high reliability, and good scalability. With the continuous enrichment of cloud service applications, more and more large and medium-sized enterprises will gradually adopt hybrid or private clouds to replace traditional data centers. This will generate huge demand for servers. According to reports, domestic server sales reached in 2015 49.12 billion yuan, an increase of 14.9% over the same period last year. It is expected that by 2018, the market sales volume is expected to reach 87.1 billion, and the compound annual growth rate will be maintained at around 20%. Figure 1, global and Chinese server market With the intensification of trade disputes between China and the United States, domestic substitution has been brought back; the country’s emphasis on information security has also increased, and with the improvement of the performance and stability of domestic servers, it has been fully capable of replacing international brands. In addition, as the local suppliers are able to serve customers more flexibly, the market share of the domestic brand servers continues to increase. The power supply, as the heart of the server equipment, has increased its market capacity year by year. At the same time, the reliability and efficiency of the power supply are still important technical issues. According to statistics, it is expected that the power consumption of the US data center will increase by 40 billion kilowatt-hours by 2020, so the increase in power efficiency will bring about considerable energy savings. Figure 2 shows the 80 Plus power certification standard. The server power supply generally requires that the power supply efficiency can reach the platinum standard. Figure 2, 80Plus Certification Standard The power MOSFET serves as a core component in the power supply, and its characteristics determine the reliability and efficiency of the power supply. The Super Junction MOSFET produced by Shang Yang Tong Technology has developed to the third generation technology level. Based on the second-generation technology pitch5-6um, the pitch distance of the super-junction MOSFET is further reduced to 4-5um, as shown in Figure 3. With the reduction of the pitch distance, the on-resistance per unit area of ​​the third generation MOSFET is significantly lower than that of the second generation. As shown in Fig. 4, FOM1 of Shang Yang Tong's second-generation super junction MOS is 20mR/mm^2. Through iterative updating of process design, the third-generation FOM1 has reached 12.9mR/mm^2, and the on-resistance per unit area has been reached. It can be reduced by 40% and reached the world's leading level. Through the reduction of this parameter, Shang Yangtong can achieve a lower Rdson in the same package, providing customers with more cost-effective solutions. Figure 3, MOSFET pitch development Fig. 4, the development of Shang Yangtong super junction MOSFET FOM1 Shang Yang Tong also uses a patented gate structure to control gate-level charge and switching speed. It is well-known that Ciss and Crss all have an important influence on the switching speed, and Sunyangtong can adjust the size of the parasitic capacitance by adjusting the gate structure to realize the adjustment of the switching speed of the device to meet the needs of different customers. For example, by increasing the gate area and increasing the output Crss capacitance, the switching rate can be reduced to meet the high EMI requirements of customers. Shang Yang Tong has adopted a patented design method to launch third-generation N-series and F-series super-junction MOSFETs to meet customer's different requirements according to customers' different needs. Among them, N series is ordinary version MOSFET, F series is high-speed version MOSFET. Its corresponding FOM2=Qg*Rdson has reached the industry-leading level, as shown in Figure 5, to meet customers' requirements for higher efficiency and lower energy consumption. Figure 5, Shang Yang Tong's third-generation product FOM2 position Compared with the second-generation products, the third-generation N series considers the compatibility of the system, and can be better compatible with existing customer products to meet customer requirements for drive and EMI compliance. F series achieves high efficiency and high power density requirements for customers with its optimal switching speed and extremely low gate charge. Figure 6 shows the comparison of switching waveforms of N series and F series. It can be seen that the turn-on and turn-off speeds of the third-generation F series products can be significantly improved, which can significantly reduce the switching losses; while the N series can help customers improve EMI with better dvdt. Performance is also more easily compatible with customer systems. Fig. 7 compares the switching loss of F and N series under different Rg, can see, through adopting F series products, the switching loss can be reduced by more than 30%, can help the customer to improve the power efficiency significantly. Figure 6, N series and F series turn-on and turn-off waveforms Figure 7. Switching loss ratios for different drive resistances Fig. 8 is the 1800W power supply topological structure and the efficiency curve of adopting Shang Yangtong 90mΩ products respectively. PFC adopts the traditional boost rectifier circuit, and DCDC adopts an efficient half-bridge LLC architecture. Using the test efficiency of the Sunny 90mR product, we can see that the efficiency is higher than 93% and the peak efficiency is over 94.5% in the heavy load range (100A~135A). Figure 8, power structure and efficiency curve of 1800W miner Conclusion: Shangyangtong has introduced a third generation of high voltage superjunction MOSFETs and designs proprietary N and F series products based on proprietary technology to meet different customer needs. The N series emphasizes system compatibility design and provides a user-friendly design interface. The F series products help customers improve power efficiency and reduce power costs with their high switching speeds. 0-20Kva Diesel Generator,Portable Power Generator,Open Type Power Generator,Container Power Generator Shanghai Kosta Electric Co., Ltd. , https://www.ksdgenerator.com
