A novel single-switch high conversion ratio DC-DC converter

By employing the coupled-inductor technique to the two cascaded boost converters, a single-switch high conversion ratio DC-DC converter is proposed. Unlike its predecessor, high voltage gain can be obtained without operating at extreme duty cycle. In addition to the operating principles and the analysis, a 100 kHz 36–75V DC input, 400V/240W converter is implemented and tested. The 91.2% maximum efficiency can be achieved under high-line 85% full load operation condition.

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