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Voltage Regulation for a DC/DC Converter

IP.com Disclosure Number: IPCOM000081797D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Milander, BJ: AUTHOR

Abstract

A technique for voltage regulation and improved efficiency of a DC-to-DC converter is shown. Oscillator 10 produces square-wave voltages V1, V2 which provide the base drive to transistors 11, 12 through pulse width controller 14. The turn-on of transistors 11, 12 is delayed by a time tau, which is controlled from the output of differential amplifier 15.

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Voltage Regulation for a DC/DC Converter

A technique for voltage regulation and improved efficiency of a DC-to-DC converter is shown. Oscillator 10 produces square-wave voltages V1, V2 which provide the base drive to transistors 11, 12 through pulse width controller 14. The turn-on of transistors 11, 12 is delayed by a time tau, which is controlled from the output of differential amplifier 15.

The output of amplifier 15 is proportional to the difference between the voltage from divider 18 and a control voltage on line 19.

The minimum delay time is designed to be greater than the maximum charge storage in transistors 11, 12, so that both transistors are not on during the switching transitions. This operation results in minimum dissipation and permits slower transistors to be used than in the usual configuration.

The output Vo of full-wave rectifier 16 is applied to low-pass filter 17 and produces a DC output voltage Vout = T - tau over T Vp. Thus, the output voltage is proportional to tau allowing output voltage control through pulse width control. Pulse width is controlled by variation of the control voltage.

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