高频变压器饱和后的影响

一旦高频变压器处于饱和状态，那将对开关元件造成致命的影响，会因过流而烧断或击穿。
因此设计高频变压器时，一定要考虑温升对磁芯的影响，留足余量

Born in the last century 60's switching power supply is a kind of modern power electronic technology to control switch turn-on and turn-off time ratio, so that the output voltage is stable in a power supply. In general, switching power supply components for PWM ( pulse width modulation ) IC MOSFET and power control.

Switching power supply from the birth of inception, due to its efficiency, both in volume or weight, is superior to the linear power supply, so in the past half century, accompanied by the rapid development of power electronics technology, the development of a switching power supply is also change rapidly, and gradually on low-power occasions instead of linear power supply.

Because of its small volume, light weight, high efficiency, small ripple, low noise characteristics, the switching power supply is widely used in military, aerospace, big, small household appliances, now without switching power supply.

The development of a switching power supply is based on the development of power electronics. In the past more than half a century, the development of power electronic devices is rapid, upgrading more is to let people see things in a blur. Therefore, the switching power supply development is rapid. In the past time, switching power supply experience the power semiconductor, high frequency switching power supply and soft switch technology and system integration technology in three main stages. But from on eighty time begin the century research and high frequency soft switching technology in past twenty years, is one of the research hotspots in the field of power electronics.

In the present, switching power supply has become today's power and the rapid development of electronics industry and an indispensable power supply mode. Domestic and foreign to the switching power supply technology in different fields have a lot of new research hotspot. The switching power supply is integrated, intelligent direction, high integration, powerful single chip switching power supply represents the current development trend of switching power supply.

In recent years, switching power supply high-frequency converter appeared push-pull, full bridge, bridge, single ended forward and single end flyback and other forms, new soft switch control technology also has zero voltage and zero current two. This paper introduces a low power dual switch forward soft switching control mode switching power supply, the power supply, with isolated transformer, gives a two-transistor forward converter type DC-DC, PWM control and driving circuit of the detailed design method and design ideas, and use the ORCAD / Pspice software on the main circuit of the switching power supply system performance for the simulation, according to the simulation results show that, the switching power supply with high efficiency, stable output voltage, circuit design more perfect, stable performance.