When we use low-dropout switching power switching converter to reduce positive input voltage, we usually need an extra low - power negative output voltage.

在采用降压开关功率开关转换器降低正输入电压的同时，通常还需要一个额外的低功率负输出电压。

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Receiving the third signal and based on a reference voltage, the switching circuit controls the pulse wave width of the switching signal so as to adjust output current of the power converter.

切换电路接收第三讯号并依据一参考电压，以 控制切换讯号的脉波宽度，所以可调整功率转换器的输出电 流。

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Simulation and experimental results show that the proposed converter has sine wave input current and output voltage, low harmonic content, adjustable power factor, and zero voltage commutation.

仿真和实验结果表明：所提出的变换器输入电流和输出电压为正弦，谐波小且输入功率因数可控，并可实现零电压换流。

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