Research of RCD Clamp Circuit of Fly-back Converter
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摘要: 分析了反激变换器的工作原理,比较了反激变换器在电流连续模式和电流断续模式下的工作情况;详细介绍了一种开关电源RCD箝位电路的设计,通过计算和仿真选取了适合的器件和参数。Matlab仿真和实验分析结果表明,加入RCD箝位电路并选取适当的R、C值后,开关管的DS电压波形有了明显的改善,电压尖峰降低了60%以上,有效地减少了对开关管的应力要求和损害,降低了开关管的损耗。Abstract: The paper analyzed working principle of fly-back converter and compared working state in current continuous mode with the one in discontinuous current mode of fly-back converter. It introduced a design method of RCD clamp circuit of switch power in details and selected devices and parameters through calculation and simulation. The results of Matlab simulation and experiment analysis showed that DS voltage wave of switch tube is improved significantly and voltage spikes are reduced more than 60% when RCD clamp circuit is joined and suitable R,C value are selected, so as to effectively reduce damage and stress requirement of switch tube and decrease power loss of switch tube.
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