Interleaved high step-up DC-DC converter with parallel-input series-output configuration and voltage multiplier module

An interleaved high step-up dc-dc converter is proposed for high voltage gain and high efficiency applications. The configuration is composed of modified two-phase interleaved boost converter with parallel-input series-output connection and a voltage multiplier module stacking on the output side. In the proposed converter, the parallel-input connection is used to share the input current and to reduce the conduction losses, while the series-output connection and voltage multiplier module are employed to obtain the high voltage gain without operating at extreme duty ratio. In addition, the input current ripple is reduced due to the interleaved operation. The voltage stresses on the power switches are greatly lower than the output voltage such that the low-voltage-rated MOSFETs with low conduction resistor are available to reduce the conduction losses and to improve the conversion efficiency. Meanwhile, the output diode reverse-recovery problem is alleviated by the leakage inductance of the coupled inductors. Finally, the experimental results from a 1-kW prototype are provided to validate the effectiveness of the proposed converter.