Paralleled DC/DC converter via primary current droop current sharing control

The paralleling DC/DC converters via primary current droop current sharing control is presented in this paper. Firstly, the steady state droop voltage characteristics are deduced from the output voltage regulation specification and then the parameters of the feedback weighted voltage resistor network can be determined accordingly. Hereafter, the inner loop voltage controller of the converter is designed by using pole placement scheme at a given bandwidth and phase margin. Furthermore, when single DC/DC converter is operated, one can find that the loop gain characteristics will not affect significantly via output, inductor and primary currents sensing schemes. Unfortunately, the cross coupling effect will occurs at paralleling operation. In order to improve the cross coupling effects, a droop voltage controller is proposed. Finally, an interleaved dual switch forward converter with an output inductor was used to verify the proposed control method. The effectiveness of the proposed scheme will be demonstrated by the simulation and experimental results.