【摘要】 无论是不控整流电路,还是相控整流电路,功率因数低都是难以克服的缺点。PWM整流电路是采用PWM控制方式和全控型器件组成的整流电路,本文以《电力电子技术》教材为基础,详细分析了单相电压型桥式PWM整流电路的工作原理和四种工作模式。通过对PWM整流电路进行控制,选择适当的工作模式和工作时间间隔,交流侧的电流可以按规定目标变化,使得能量在交流侧和直流侧实现双向流动,且交流侧电流非常接近正弦波,和交流侧电压同相位,可使变流装置获得较高的功率因数。更多还原

【Abstract】 Not only uncontrolled rectifier but also phase controlled rectifier have the same weakness of low power factor.PWM rectifier is made of full-controlled device,working as PWM mode.Based on teaching material of Power Electric Technology,this paper analyses fundamental and four work modes of single phase voltage type PWM rectifier.If appropriate work modes and right interval between various modes are adopted,the current of AC side will vary according to scheduled aim,the energy can be bidirectional flow between AC side and DC side.The current of AC side is close to sine wave very much,and gets the same phase with voltage of AC side,then the convert will get high power factor.更多还原