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Transformerless DC-to-DC Converters with Large Conversion Ratios

Middlebrook, R. D. (1984) Transformerless DC-to-DC Converters with Large Conversion Ratios. In: International Telecommunications Energy Conference, 1984. INTELEC '84. IEEE , Piscataway, NJ, pp. 455-460. https://resolver.caltech.edu/CaltechAUTHORS:20160408-121238318

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1109/INTLEC.1984.4794165DOIPaper
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4794165PublisherPaper
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.
Funders:
Funding AgencyGrant Number
General Telephone CompanyUNSPECIFIED
Emerson Electric CompanyUNSPECIFIED
NSFPHY05-51164
NSF Graduate Research FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20160408-121238318
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ID Code:66025
Collection:CaltechAUTHORS
Deposited By: Kristin Buxton
Deposited On:13 Apr 2016 18:29
Last Modified:03 Oct 2019 09:52

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