Transformerless DC-to-DC Converters with Large Conversion Ratios
- Creators
- Middlebrook, R. D.
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 be a 50V to 5V converter in which dc isolation is not required. The absence of a transformer and a larger duty ratio permits operation at very high switching frequency, and makes the circuit amenable to partial integration and hybrid construction techniques. An experimental three-stage voltage divider Ćuk converter converts 50V to 5V at 50W with an efficiency of 77% at 500 kHz and 71% at 1 MHz, higher than for a basic Ćuk converter operated at the same conditions.
Additional Information
© 1984 IEEE. This work was conducted under the Power Electronics Program, supported by grants from the General Telephone Co. and from Emerson Electric Co. A patent application has been filed on the voltage-divider Ćuk converter circuit. All of the experimental work, and the derivation of the small-signal model, for the voltage-divider Ćuk converter was done by Steve Freeland, a graduate student in the Caltech Power Electronics Group. He was supported by a National Science Foundation Fellowship.Attached Files
Published - 04794165.pdf
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Additional details
- Eprint ID
- 66025
- Resolver ID
- CaltechAUTHORS:20160408-121238318
- General Telephone Company
- Emerson Electric Company
- NSF
- PHY05-51164
- NSF Graduate Research Fellowship
- Created
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2016-04-13Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field