A Novel Switch-Coupled Inductor High Gain Quadratic Converter with Low Input Current Ripple

In order to reduce the ripple of input current at the input and increase the output voltage of the converter, a new switch coupled-inductor high-gain converter is proposed. The principle of operation of the proposed new switch coupled-inductor converter is analyzed. According to the influence of L-1 and L-2 in the switch coupledinductor unit on the working state, the inductors L-1 and L-2 are divided into three cases: L-1 = L-2 , L-1 > L-2 , L-1 < L-2 , the expressions of voltage gain ratio and coupling input inductor current ripple of the converter under three conditions are derived. By comparing with the original quadratic converter, it is concluded that the proposed magnetic integrated converter reduces the ripple of input current, while increasing the voltage gain, and summarizes the best working conditions of inductors L-1 and L-2 . Finally, the outstanding characteristics of the proposed converter have been confirmed by simulation and experiment.