In recent years, with the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life has become increasingly close, and electronic equipment is inseparable from reliable power supply. In the 1980s, computer power supply fully realized the modularization of switching power supply. The first to complete the power generation of the computer, into the 90s, switching power supply has entered a variety of electronic and electrical equipment fields, program-controlled switches, communications, electronic testing equipment power, control equipment power supply, etc. have widely used switching power supply, promoted switching power supply Rapid development of 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 system 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.
Some insiders believe that the high frequency of switching power supply is the direction of its development. The high frequency makes the switching power supply miniaturized, and the switching power supply enters a wider range of applications, especially in high-tech applications, which promotes the switching power supply. The development progresses with the growth rate of more than two digits every year toward light, small, thin, low noise, high reliability and anti-interference.
Switching power supply modules can be divided into AC/DC and DC/DC. The DC/DC converters are now modularized, and the design technology and production process have been matured and standardized at home and abroad, and have been recognized by users. However, the modularity of AC/DC, due to its own characteristics, leads to more complex technical and process manufacturing problems in the process of modularization. In addition, the development and application of switching power supplies are of great significance in terms of energy conservation, resource conservation and environmental protection.
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%. 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 operating voltage of the microprocessor 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 0.01, and traditional technology is difficult to meet such difficult design requirements. In the case of a 10m load, every m of resistance to the load path reduces efficiency by 10, the wire resistance of the printed circuit board, the series resistance of the inductor, the on-resistance of the MOSFET, and the die wiring of the MOSFET. Have an impact.
Third, digital control technology is widely used
The switching power supply module uses digital signal control (DSC) technology 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 digital control technology is a new trend in the future development of the module power supply industry. Currently, there are few products. Most module power companies do not master the digitally controlled module power technology. The industry believes that in many applications, the need to improve energy efficiency will drive the demand for power management ICs in the coming year. 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 efficiency products will be expected to promote digital power management in applications such as DC-DC converters.
Fourth, the intelligent power module began to heat up
The intelligent power module not only integrates the power switching device and the drive circuit. Moreover, fault detection circuits such as overvoltage, overcurrent and overheating are built in, and the detection signal can be sent to the CPU. It consists of a high-speed, low-power die, an optimized gate drive circuit, and a fast-protection circuit that protects the IPM from damage even in the event of a load accident or improper use. IPM generally uses IGBT as a power switching element, and has an integrated structure of a current sensor and a driving circuit. IPM is winning more and more 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 2018, switching power supply modules continue to increase integration and intelligence, and the industry is also vying to provide higher power density packages, and smart power modules will also be greatly developed. Although the prospect of the switching power supply market is attractive, 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.