Research on Zero Crossing Current Spike of Totem-Pole Bridgeless PFC Circuit Based on SiC

doi:10.16628/j.cnki.2095-8188.2023.02.004

Abstract

Abstract:

The totem-pole bridgeless PFC circuit based on SiC has excellent performance,but there is still an inherent problem of zero crossing current spike.In order to suppress the zero crossing current spike,based on the depth analysis of the zero crossing current spike of totem-pole bridgeless PFC circuit,a new current spike suppression strategy based on digital control is proposed,which inserts a transition interval near the zero crossing.The new strategy includes the control of fast switching bridge arm switch soft start before the zero crossing,and the control of enhanced PI controller after the zero crossing.In order to achieve the smooth soft start,a soft start strategy based on the real-time current closed-loop PI feedback is further proposed.The new control strategy has fewer circuit modes,simple and effective control and easy implementation.

Key words: SiC, totem-pole PFC, current spike, current distortion rate

CLC Number:

TM714.1

LIN Zhiwei, MAO Xingkui, CHEN Qi, ZHENG Runmin, ZHU Jungao. Research on Zero Crossing Current Spike of Totem-Pole Bridgeless PFC Circuit Based on SiC[J]. LOW VOLTAGE APPARATUS, 2023, 0(2): 16-21.

Figures/Tables 11

References 12

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参数	数值
输入电压u_ac	AC 100~270 V/50 Hz,额定220 V
母线电压u_bus/V	DC 400
输出功率P_o/W	500
开关频率f_sw/kHz	100
快切换桥臂开关管VT1,VT2	CreeC3M0120065K(SiC)
慢切换桥臂开关管VT3,VT4	IPW60R037CSFD(Si)