Abstract
It's known to all that higher voltage gain is indispensable before grid connecting of renewable energy. Furthermore, auxiliary electronic equipment of electric vehicle also requires relative low rated voltage to ensure regular service. In fact, BOOST-BUCK DC-DC converter (also called Cuk DC-DC converter) could realize ascending and descending of voltage. However, in order to ensure secure operation, electrical isolation measure needs to be adopted as well. Forward converter and Flyback converter are ordinary isolated DC-DC converter. Therefore, combinational Cuk-Forward and Cuk-flyback DC-DC converter are theoretically feasible to meet above requirements. In this paper, modeling and simulation of the two combinational converter have been manipulated with OrCAD-Pspice software. The result shows that the principle of Cuk-Forward and Cuk-flyback DC-DC converter is absolutely accurate. Moreover, the harmonic of output voltage, input current, and voltage stress of switch could also be reduced by optimization design of circuit parameters.
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