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Transformerless DC-to-DC converters with large conversion ratios

Middlebrook, R. D. (1988) Transformerless DC-to-DC converters with large conversion ratios. IEEE Transactions on Power Electronics, 3 (4). pp. 484-488. ISSN 0885-8993. doi:10.1109/63.17970.

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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.

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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.
Issue or Number:4
Record Number:CaltechAUTHORS:20151221-093816368
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63101
Deposited By: Kristin Buxton
Deposited On:22 Dec 2015 19:44
Last Modified:10 Nov 2021 23:11

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