【摘要】 利用耦合输出电感进行次级箝位移相控制;采用了无损耗元件及有源开关的简单辅助电路;副边整流二极管的电压应力和传统的硬开关电路一样小;轻载时箝位电容的充、放电电流能根据负载情况自动调整,可保证在很宽的负载范围内变换器都有高效率;辅助回路二极管Dc可以实现软关断,因而反向恢复影响小;本变换器不存在原边环流,因而可以提高变换效率.文中分析了该新型拓扑的工作原理,提出了参数设计依据,进而推导了变换器各种状态时的参数计算方程;采用此方案成功研制了48 V/20 A软开关电源,进行了参数设计,并给出了其仿真和试验结果.试验结果表明该变换器在1/3负载以上时效率可以高达92%以上.更多还原

【Abstract】 A novel phase-shifted control ZVZCS converter is proposed which uses a coupled output inductor.Compared with the previously proposed topologies,a simple auxiliary circuit is used which consists of neither lossy components nor active switchings.The voltage stress of the secondary rectifier diode is kept as small as that of hard-switching converter.The current to charge clamping capacitance is self-adjusted in accordance with the load at light condition,which guarantees high efficiency over wide load range.Diode D_c of auxiliary circuit is softly commutated and it′s reverse recovery is minimized.The principle of operation,topology,features and parameter-design of the novel converter is analyzed.A 48V/20A soft-switching converter is developed.The experimental results show that the efficiency of this converter may reach as high as 92% when it is in 1/3 load.更多还原