一种断续导电模式的单相AC-DC变换器

A Single-phase AC-DC Converter Using Discontinuous Conduction Mode

基于一种已有三相AC-DC变换器拓扑,提出一种升降压型单相AC-DC变换器拓扑,其特点是:功率电感置于桥臂内部,3只功率开关采用同一PWM驱动信号,且工作在断续导电模式(DCM),可以获得单位输入功率因数。对该单相AC-DC变换器的工作原理进行理论分析,包括最大占空比限制和关键器件参数选择依据,采用Matlab/Simulink进行仿真验证,结果表明:该单相AC-DC变换器电路控制简单,易于实现。

Based on an existing three-phase AC-DC converter topology,a kind of step up/down singlephase AC-DC converter topology was proposed.It is characteristic of that the power inductor is built inside the bridge arm,three power switches employ the same PWM driving signal and work in the discontinuous conduction mode(DCM),and the unitary input power factor can be obtained.The principle of the single phase AC-DC converter was theoretically analyzed,including the maximum duty cycle limit and the selection of key device parameters,and the simulation verification was carried out by means of Matlab/Simulink.The results show that the single-phase AC-DC converter has simple circuit and easy to implement.