【摘要】 传统型 PWM控制的开关电源是硬开关 ,开关损耗大 ,不利于向小型化、轻量化发展。本文提出利用零电压开关谐振技术实现功率开关管的软开关技术 ,从而降低开关损耗 ,并采用 SG3 5 2 5为核心的主开关控制电路 ,提高系统的动态响应性能 ,同时采用 UC3 85 4对 AC/DC变换过程作了功率因数校正 ,以改善输入电流的波形 ,提高电力资源的利用率更多还原

【Abstract】 Since the conventional PWM converter is the hard-switch, and it is difficult to reduce the switching loss. This paper present a soft switching PWM converter and its analysis and design, it can reduce the switching loss. And use SG3525 to improve the circuit character. The UC3854 is proposed to apply in the circuit to increase the power factor. The experimental result shows the APFC ’s feasibility.更多还原