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Single-stage soft-switched PWM flyback power factor correction with reduced dead angle

机译:具有减小死角的单级软开关PWM反激功率因数校正

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摘要

This study proposes a single-stage zero-voltage transition pulse width modulation (PWM) flyback power factor correction converter. The bulk capacitor voltage is controlled by using negative magnetic feedback (NMF) without any input current dead angle. In the proposed circuit, the main and auxiliary switches turn on and off under zero-voltage switching and zero-current switching conditions, respectively. The proposed auxiliary circuit provides soft switching condition while eliminating the dead angle caused by NMF winding. Thus, high-efficiency and high-power factor is achieved. Experimental results obtained from a 160 V/300 W circuit are provided to verify that the proposed structure can suppress the dead angle at zero crossing and soft switching of all switches can be achieved properly.
机译:本研究提出了一种单级零电压过渡脉冲宽度调制(PWM)反激功率因数校正转换器。大容量电容器电压通过使用负磁反馈(NMF)来控制,而没有任何输入电流死角。在提出的电路中,主开关和辅助开关分别在零电压开关和零电流开关条件下导通和关断。所提出的辅助电路提供了软开关条件,同时消除了由NMF绕组引起的死角。因此,实现了高效率和高功率因数。提供了从160 V / 300 W电路获得的实验结果,以验证所提出的结构可以抑制零交叉处的死角,并且可以正确实现所有开关的软开关。

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