采用多输入DC/DC变换器实现对谐波和纹波的抑制

Realizing the Suppression of Harmonic Waves and Ripple Waves by Adopting Multiple Input DC/DC Converter

电子仪器和设备中的电源越来越广泛地采用开关方式的DC/DC变换器 ,以致于工频电源中高次谐波的含量增多 ,国际IEC对此作了限制 .文中提出采用多输入的DC/DC变换器 ,抑制输入电流的高次谐波 ,获得良好效果用前馈控制和反馈控制相结合的办法 ,使输出电压的低频纹波 ,由单输入时的 2 80mV左右降至80mV左右 ;同时使功率因数得到提高 ,从而降低了谐波失真系数 .

As power supply of electronic instruments and equipments, DC/DC converters of switching mode are so increasingly adopted that the content of high order harmonic waves in power frequency supply increases and they are restricted by International Electro-technical Commission (IEC). The authors suggest to adopt multiple input DC/DC converter for suppressing high order harmonic waves of input current on which good effect has been obtained. By means of feedforward control in combination with feedback control, low frequency ripple waves of output voltage exhibit a decrease from about 280 mV of one input to about 80 mV of multiple input; while power factor exhibits an increase. Thus the distortion factor of harmonic waves decreases.