Switching power supply high frequency is the direction of its development, high frequency to make switching power supply miniaturization, and switching power supply into a wider range of applications, especially in the field of high-tech applications, to promote the development of switching power supply, the annual growth rate of more than two digits to light, small, thin, low noise, high reliability, anti-interference direction. Switching power supply can be divided into two types of AC/DC and A/V converter, DC/DC converters are now modular, and the design technology and production process at home and abroad have been mature and standardized, and has been recognized by users, but the modular AC/DC, because of its own characteristics in the modular process, Encountered more complex technical and process manufacturing problems.
In addition, the development and application of switching power supply are of great significance in saving energy, saving resources and protecting the environment.
The power electronic devices used in switching power supply are mainly diode, IGBT, MOSFET and transformer.
SCR has a few applications in switching power supply rectifier circuit and soft start circuit, the gtr drive is difficult, the switching frequency is low, and gradually replaced by IGBT and MOSFET. The development direction of switching power supply is high frequency, high reliability, low consumption, noise, anti-jamming and modularization. Since the switching power supply light, small, thin key technology is high-frequency, so foreign major switching power supply manufacturers are committed to the synchronous development of new high-intelligent components, especially to improve the loss of two rectification devices, and on the power ferrite material to increase scientific and technological innovation, in order to improve the high frequency and large magnetic flux density (Bs) High magnetic properties, and the miniaturization of capacitors is a key technology. The application of SMT technology makes the switching power supply make great progress, and the components are arranged on both sides of the circuit board to ensure that the switching power supply is light, small and thin. The high frequency of switching power supply is bound to innovate the traditional PWM switch technology, realize Zvs, ZCS soft switch technology has become the mainstream technology of switching power supply, and greatly improve the efficiency of switching power supply.
For the high reliability Index, the American switching power supply manufacturers reduce the stress of the device by reducing the operating current and reducing the junction temperature, which makes the product reliability greatly improved. Modularization is the general trend of the development of switching power supply, which can be composed of modular power supply system, can be designed as n+1 redundant power supply system, and realize the capacity expansion of parallel mode. For switching power supply operation noise is a disadvantage, if the single pursuit of high frequency of its noise will also increase, and the use of partial resonant conversion circuit technology, in theory can achieve high-frequency and reduce noise, but the actual application of some resonant conversion technology still has technical problems, it is still necessary to carry out a lot of work in this field,
To make the technology practical. With the continuous innovation of power electronic technology, the switching power supply industry has a broad development prospect.
To speed up the development speed of China's switching power supply industry, we must take the road of technological innovation, go out the road of joint development with Chinese characteristics, and contribute to the rapid development of our national economy.