Active power decoupling topology for AC-DC and DC-AC single-phase systems with decoupling capacitor minimization

Passive power decoupling in single-phase DC-AC and AC-DC systems usually requires usage of electrolytic capacitors. To minimize converter volume, increase reliability, robustness and to eliminate ripple power effect on the DC side, new solutions for Active Power Decoupling are proposed. In this paper a novel Active Power Decoupling topology for low power single-phase AC-DC and DC-AC converters is presented. The proposed topology is based on well-known boost and buck-boost topologies but with a completely different control scheme. The topology description with a complete control algorithm is presented. The proposed APD solution is verified by experimental results of a 450 W converter in AC-DC mode and a 320 W converter in DC-AC mode.