Abstract
This paper proposes a high step-up high-efficiency converter, comprised of an active switched coupled-inductor cell. The secondary windings are integrated into a rectifier voltage multiplier cell in a boost-flyback configuration, allowing the operation with high voltage gain with low switches duty cycle and low turn-ratios on the coupled-inductors. Both coupled-inductors are integrated into a single core due to the parallel operation of the switches. The leakage inductances of the coupled-inductors are used to mitigate the reverse recovery currents of the diodes, while regenerative clamp circuits are used to protect the switches from the voltage spikes caused by the leakage inductances. The operation of the converter is analyzed both quantitatively and qualitatively, and the achieved results are validated through experimentation of a 400 W prototype. A 97.1% CEC efficiency is also reported.
Highlights
Many applications require DC–DC low voltage (20–50 V) to high voltage (380–400 V) power conversion
To overcome the aforementioned disadvantages, this paper proposes a new high step-up, high efficiency Voltage Multiplier Cells (VMCs) coupled switched-inductors based DC–DC converter
VMC techniques, the proposed converter is capable of achieving high voltage gain without high duty cycle and turn-ratios and low total component count
Summary
Many applications require DC–DC low voltage (20–50 V) to high voltage (380–400 V) power conversion. Interleaved DC–DC converters are capable to achieve high voltage gain and present the beneficial features of reduced current ripples and current stress on the switches, due to the input current sharing between phases, while still maintaining good power density [25,26,27] This arrangement, leads to an increased number of components with the same power rating of a single switch converter, as each phase of the interleaved converter operates alternately to each other. The VMC output capacitors are placed in a boost-flyback configuration, which permits high voltage gain with small voltage stress across all components, allowing the use of low Rds,on semiconductors Since both pairs of windings share the same operation modes, the magnetic components are integrated into a single core. To supress voltage spikes on the switches, regenerative clamper circuits are used
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