Three-Phase high power factor rectifier based on hysteresis control

Now diodes and thyristors are used in many rectifying devices.The common problems of those devices are high harmonic content in grid current and low power factor.Aiming at the question of harmonic waves ,many methods are proposed by experts,such as active power filters,multiple technology,and so on.However,harmonic waves are not elimilated radically.Three-Phase high power factor rectifier has the advantages of not causing harmonic current,operating in high power factor,and flexible controling.The main circuit structure and control method of the three-phase high power factor rectifier are presented in this paper.Also,the principle of hysteresis control which outputs the PWM signals to drive IGBT is introduced in detail.The possibility of the hysteresis control used in three-phase high power factor rectifier is verified by simulation of Matlab.