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Published October 1988 | Published
Journal Article Open

Transformerless DC-to-DC converters with large conversion ratios

Abstract

A new switching dc-to-dc converter is introduced in which large voltage step-down ratios can be achieved without a very small duty ratio and without a transformer. The circuit is an extension of the Ćuk converter to incorporate a multistage capacitor divider. A particularly suitable application would he a 50-V to 5-V converter in which dc isolation is not required. The absence of a transformer and a larger duty ratio permits operation at a high switching frequency and makes the circuit amenable to partial integration and hybrid construction techniques. An experimental 50-W three-stage voltage divider Ćuk converter converts 50 V to 5 V at 500 kHz, with efficiency higher than for a basic Ćuk converter operated at the same conditions. A corresponding voltage-multiplier Ćuk converter is described, and also dual buck-boost-derived step-down and step-up converters.

Additional Information

© 1988 IEEE. Manuscript received January 29, 1988; revised May 23, 1988. This paper was presented in part at INTELEC '84, New Orleans, LA, Nov. ll-14, 1984.

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Created:
August 19, 2023
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October 25, 2023