A Series-Connected Power Decoupling Single-Phase Current-Type PWM Rectifier

To reduce the direct-current (DC)-side inductances of single-phase current-source pulse-width-modulation (PWM) rectifiers while improving their power densities. This paper introduces a symmetric half-bridge power decoupling circuit topology. First, the circuit structure and its operating principles are analyzed in detail, following which system performance is further enhanced, leveraging the magnetic integration technology. Furthermore, a simplified control strategy based on the indirect closed-loop control of the DC-side output current is introduced. This method requires fewer sensors and simpler calculations, thereby improving system stability, and achieves approximately a 15% increase in efficiency compared to conventional methods. Simulation results demonstrate that the proposed topology significantly suppresses second harmonic ripples commonly observed in the DC-side currents of single-phase current-source PWM rectifiers. Furthermore, it reduces the values of DC-side inductances while lowering the system volume and cost. Finally, experimental validations confirm the significant potential of the symmetric half-bridge power decoupling circuit topology in enhancing the performance of single-phase current-source PWM rectifiers.