Direction of development
High-frequency switching power supply is the direction of its development, high-frequency switching power supply to miniaturization, and the 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, More than two digits of growth rate toward the light, small, thin, low noise, high reliability, anti-jamming direction. Switching power supply can be divided into AC / DC and DC / DC two categories, DC / DC converter has been modular, and design techniques and production processes are mature and standardized at home and abroad, and has been recognized by users, but AC / DC modular, because of its own characteristics in the modular process, encountered more complex technology and process manufacturing problems. In addition, the development and application of switching power supply in the conservation of energy, conservation of resources and the protection of the environment are of great significance.
Switching power supply applications in the power electronic devices are mainly diodes, IGBTs and MOSFETs, transformers.
SCR in the switching power supply input rectifier circuit and a soft start circuit in a small amount of application, GTR drive difficult, low switching frequency, and gradually replaced by IGBT and MOSFET.
Switching power supply development direction is high frequency, high reliability, low consumption, low noise, anti-interference and modular.
Switching power supply
Switching power supply
As the switching power supply light, small, thin key technology is high frequency, so the major foreign switching power supply manufacturers are committed to simultaneously develop new and highly intelligent components, in particular, to improve the secondary rectifier device loss, and power iron Oxygen material on the scientific and technological innovation to improve the high frequency and large magnetic flux density (Bs) to obtain high magnetic properties, and the miniaturization of the capacitor is also a key technology. The application of SMT technology makes the switching power supply has made great progress in the circuit board on both sides of the layout components to ensure that the switching power supply light, small, thin. Switching power supply on the high frequency of traditional PWM switching technology must be innovative, to achieve ZVS, ZCS soft switching technology has become the mainstream switching power supply technology, and significantly improve the efficiency of switching power supply. For high reliability indicators, the US switching power supply manufacturers by reducing the operating current, reduce the junction temperature and other measures to reduce the stress of the device, making the product greatly improved reliability.
Modularity is the overall trend of switching power supply development, modular power can be used to form a distributed power system, can be designed as N + 1 redundant power supply system, and to achieve parallel capacity expansion. For the switching power supply operation noise this shortcomings, if the pursuit of high frequency of its noise will also increase with the use of part of the resonant conversion circuit technology, in theory, can achieve high frequency and can reduce noise, but some The practical application of resonant conversion technology still has technical problems, so it is still necessary to carry out a lot of work in this field, so that the technology can be practical.
Power electronics technology innovation, so that the switching power supply industry has a broad development prospects. To speed up the development of China's switching power supply industry, we must take the road of technological innovation, out of the Chinese characteristics of the joint development of production and research, for the rapid development of China's national economy to contribute.