A Parallel-Connected 40-Pulse Diode Rectifier With DC-Link Passive Pulse Multiplication Circuit

This article proposes a parallel-connected 40-pulse diode rectifier (40PDR) based on a 20-pulse diode rectifier (20PDR) with a passive pulse multiplication circuit (PPMC) to mitigate harmonics. The PPMC deployed in this article is connected to the 20PDR dc-side and consists of a modified interphase transformer and two single-phase rectifiers. Since the proposed design only requires a low-capacity PPMC and does not need any switching and control circuits, the proposed 40PDR is a simple and low-cost solution. More importantly, using the proposed circuitry, the input current is almost sinusoidal; its input current total harmonic distortion is less than 1%. Simulations and experimental results reveal the proposed 40PDR's effectiveness in reducing harmonic distortion.