采用准谐振和同步整流技术的隔离功率开关电源研究

Disquisition of Switch Power-Supply with Quasi-Resonance Techniques and Synchronous Rectifying Techniques

介绍一种由常规PWM控制器改进设计为FM控制器,从而实现固定关断时间的变频准谐振模式的开关电源,输出级采用同步整流技术,大大降低了开关损耗和开关瞬时漏感引起的高频噪声,从而较好地解决了功率隔离开关电源的高频噪声电平高、功率损耗大的问题。

One design of normal PWM controller improve to FM controller is discussed, accordingly, frequency changing resonance techniques with changeless off-time is designed, circuit output end with synchronous rectifying, so the high frequency noise and on-off-time power waste are reduced, then, the key problem of isolated switch power-supply is resolved.