改进型有源箝位正激电路的研究

在有源箝位正激电路中,为了使主开关管和辅助开关管能较容易地实现零电压开通条件,提出了一种改进型有源箝位正激拓扑方案。与传统有源箝位正激变流器相比,新方案增加了一个辅助网络,由一个箝位电容和电感构成,这将使变流器能在整个负载范围内轻松地实现零电压开通。因此,大大减少了开关损耗并使电路效率得以提高。详细介绍了变流器的工作模态,并与传统有源箝位电路的性能作了比较。设计了一个230V输入,14.4V/10A输出的样机,给出了工作流程和实验结果,实验数据证明了理论分析的正确性。

Study Of Improved Active-clamp Forward Converter

In order to achieve Zero Voltage Switching (ZVS) easier for both primary switch and auxiliary switch in the active clamp forward converter,an improved active-clamp ZVS forward converter topology is proposed in this paper.Compared with the conventional active-clamp forward converter,the improved one with an auxiliary network which is consisted of a clamp capacitor and an inductor could easily achieve ZVS in full-load range.Therefore the circuit efficiency is increased by reducing the switching loss of the switches.The operation principles of the proposed converter circuit are analyzed in detail and the performance is compared with the conventional one.The design procedure and the experimental results are presented for a converter with a 230 V input,14.4 V/10 A output.The experimental results match the theoretical analysis very well.