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Magnetic Voltage Regulator

IP.com Disclosure Number: IPCOM000080897D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Williams, ER: AUTHOR

Abstract

This circuit provides closely regulated voltages at relatively high-power levels at a low cost. Regulation is achieved by alternately directing the magnetic flux M in the transformer core through the appropriate windings.

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Magnetic Voltage Regulator

This circuit provides closely regulated voltages at relatively high-power levels at a low cost. Regulation is achieved by alternately directing the magnetic flux M in the transformer core through the appropriate windings.

Voltage source 4 energizes winding 11 on leg 1 of transformer 10. Flux Phi generated in leg 1 is divided between legs 2 and 3 depending upon the reluctance presented by each path. Winding 13 on leg 3 is the control winding. When bidirectional switch 5 is conducting, the current induced in winding 13 prevents flux Phi from flowing through this leg, and flux Phi is forced through leg 2 which induces a current in output winding 12.

Rectifier and filter 6, connected to winding 12, provide a DC output voltage, VO, at terminal 14. Error amplifier 8 controls the fraction of each cycle during which winding 13 is shorted by switch 5. Amplifier 8 is responsive to an error signal generated by summing circuit 7, which compares VO to a reference voltage provided by battery 9.

Since no voltage is externally applied to winding 13, as in a saturable reactor circuit, flux Phi never reaches a saturating level in transformer 10. The circuit, therefore, can respond to one-half cycle variations in input and output voltages while maintaining high efficiency.

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