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Analysis of active power decoupling in single-phase rectifier using six-switch topology

In this paper, active power decoupling using six switch rectifier with a built-in ripple port (inductive or capacitive or combination of both) to reduce the size of the E-cap is studied. The six switch rectifier is analyzed as a three-port converter: (i) AC source at the input port, (ii) a load at the DC output port, and (iii) an inductor or capacitor connected to the third port called ripple port. With appropriate modulation technique, second harmonic ripple power is circulated between the input port and the ripple port without disturbing the active power flow between the input port and the output port. A suitable closed-loop controller is designed to regulate the DC bus voltage and minimize the second harmonic ripple simultaneously. The step response results presented in the paper confirm the stability of the closed loop design. The relation between modulation indices of ripple port and active port is derived to maximize the utilization of DC bus in these converters. Simulation results are presented to validate the analysis and effectiveness of the circuit. The analysis made for the ripple port can be extended to micro-inverters as well.