With the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life is increasingly close, and electronic equipment is inseparable from reliable power supply. In the 1980s, computer power supply fully realized switching power supply, and completed the computer first. In the 1990s, switching power supplies have entered various fields of electronics and electrical equipment. Program-controlled switches, communications, electronic testing equipment power supplies, and control equipment power supplies have widely used switching power supplies, which has promoted the rapid development of switching power supply technology. Now, intelligent applications in emerging fields such as digital TV, LED, IT, security, high-speed rail, and smart factories will greatly promote the development of the switching power supply market. 
Switching power supply module is a new generation of switching power supply products, mainly used in civil, industrial and military applications, including switching equipment, access equipment, mobile communications, microwave communications, optical communications, routers and other communications fields and automotive electronics, aerospace Wait. Due to the short design cycle, high reliability and easy system upgrade, the module power supply has more and more applications. Especially in recent years, due to the rapid development of data services and the continuous promotion of distributed power supply systems, the increase of module power supply has exceeded the primary power supply.
First, the power density is not the highest, only higher
With the large use of semiconductor technology, packaging technology and high-frequency soft switches, the module power supply density is getting larger and larger, the conversion efficiency is getting higher and higher, and the application is becoming more and more simple. The current new conversion and packaging technology enables the power density of the power supply to exceed (50W/cm3), which is more than double the power density of the conventional power supply, and the efficiency can exceed 90%. For example, Vicor recently announced the launch of its first ChiP (Converter housed in Package) platform power device module. The new ChiP Bus Converter Module (BCM) delivers up to 1.2 kW at 48 V output with 98% peak efficiency and a power density of 1,880 W/in3 (115 W/cm3). Breakthrough performance is four times higher than the power converters of the same type currently available on the market, enabling efficient high-voltage DC distribution infrastructure for data center, telecom and industrial applications.
Second, low voltage and high current
As the microprocessor's operating voltage drops, the module's power supply output voltage has dropped from the previous 5V to the current 3.3V or even 1.8V. The industry predicts that the power supply output voltage will drop below 1.0V. At the same time, the current required by the integrated circuit increases, requiring the power supply to provide a larger load output capability. For a 1V/100A module power supply, the payload is equivalent to 0.01Ω, and traditional technology is difficult to meet such difficult design requirements. In the case of a 10mΩ load, every mΩ resistor to the load path reduces efficiency by 10%, wire resistance of the printed circuit board, series resistance of the inductor, on-resistance of the MOSFET, and die wiring of the MOSFET. Efficiency has an impact.
Third, digital control technology is widely used
The digital signal control (DSC) technology is used to control the closed-loop feedback of the power supply, and form a digital communication interface with the outside world. The module power supply adopting the digital control technology is a new trend of the future development of the module power supply industry. Currently, there are few products, most of the modules. Power companies do not have digitally controlled module power technology. Pan Dawei, vice president of sales for Asia Pacific, International Rectifier Corporation (IR) believes that in terms of industry development, in many applications, the need to improve energy efficiency will drive power management ICs in the coming year. demand. After several years of slow development, digital power management has now entered a stage of rapid development. In the next 10 years, key research on energy-efficient products will be expected to promote digital power management in applications such as DC-DC converters.
Fourth, the intelligent power module begins to heat up
The IPM Intelligent Power Module not only integrates the power switching device and the driver circuit. Moreover, fault detection circuits such as overvoltage, overcurrent and overheating are built in, and detection signals can be sent to the CPU. It consists of a high speed, low power die and an optimized gate drive circuit as well as a fast protection circuit. Even if a load accident or improper use occurs, the IPM itself can be guaranteed to be free from damage. IPM generally uses IGBT as a power switching component, and has an integrated structure of a current sensor and a driving circuit. IPM is winning more and more large market with its high reliability and ease of use. It is especially suitable for inverters and various inverter power supplies for driving motors. It is a variable frequency speed control, metallurgical machinery, electric traction, servo drive, and frequency conversion appliances. A very ideal power electronic device.
In 2014, as ICs continue to increase integration and intelligence, and the industry is also vying to provide higher power density packages, such as SO8FL, μ8FL, PhaseFET, dual MOSFET packages, etc., smart power modules will also achieve great development, currently IR Companies such as ON Semiconductor and Linear Technology have layouts.
Statistics show that from 2004 to 2010, the global sales of switching power supply market has maintained an average growth of about 15%. According to the China Power Supply Society and ICTresearch, the output value of China's power industry will reach 215.6 billion yuan in 2015. The output value of switching power supplies will be It reached 187.5 billion yuan. 2011-2015 annual compound growth of 13.39%! Although the open source power market is promising, the current high-end market is mainly dominated by international brands. Local brands need to continue to strengthen their product detail design, quality control and reliability in order to make the Nuggets a big market.
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