An interleaved high step-up DC-DC converter with cumulative voltage unit

摘要

A new interleaved high step-up dc-dc converter with the circuit of cumulative voltage unit (CVU) is proposed in this paper. The proposed converter is suitable to the application of requiring high ratio of the output voltage to input voltage. Only two switches are required to form the double boosting path and the interleaved topology. The new technique of the cumulative voltage unit forms the post part of the high step-up converter. Each CVU module can share common diodes to reduce the number of the components, step up the voltage gain and clamp the voltage effectively. The interleaved structure in the input end can reduce the power loss in each current-flowing component and the input current ripple. The CVU modules can be arranged with different manners to extend the circuit topology. The proposed CVU circuit will be verified by the simulation and experiments finally. The theoretical analyses and circuit design about this kind of converter will also be given to complete the illustration of the interleaved high step-up CVU converter.