A novel shunt active current shaping scheme for multiple paralleled DC-DC converters

A new shunt current shaping scheme with zero average power consumption for multiple paralleled DC-DC converters is proposed in this paper. The current command for the shunt current shaper is indirectly obtained by forcing the source current to follow the demanded sinusoidal signal. The amplitude of the demanded sinusoidal source current which is in phase with the source voltage can be determined from the total load currents of the post-stage DC-DC converters. Neither high-order filters nor time-consuming computations are required. The shunt current shaper supplies all the harmonics of the distorted input current and the power source only supplies the fundamental component. Experimental results on a prototype system verify the feasibility of the presented scheme. The implemented shunt current shaper demonstrates an efficiency of 92% and a high power factor at the source side of 0.99