Browse Prior Art Database

POWER REGULATOR FOR A RESISTIVE LOAD

IP.com Disclosure Number: IPCOM000023728D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 228K

Publishing Venue

Xerox Disclosure Journal

Abstract

A circuit is disclosed for regulating the level of current supplied to an incandescent lamp or fuser heater resistive load without causing disturbances on the incoming power line that would otherwise exceed predetermined limits. The circuit includes a full-wave rectifier 10 operative to receive an alternating current signal for conversion to a pulsating unidirectional power signal which is supplied to a series circuit including the resistive load 12, a transistor 14 and a sampling resistor 16. A control signal developed across the sampling resistor 16 is supplied to a pulse width modulator 18 which has its output connected to the base of transistor 14 whereby the pulsating unidirectional power signal is chopped into pulses that have a high frequency relative to that of the alternating current signal and have uniform duration through a given cycle of the alternating current signal whereby a power factor approaching one is achieved.

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XEROX DISCLOSURE JOURNAL

~RREGULATQRFORA~SISTIVE

Halsey P. Quinn

Proposed Classification
U.S. Cl. 363/124
mt. Cl, HO2rn

A circuit is disclosed for regulating the level of current
supplied to an incandescent lamp or fuser heater resistive
load without causing disturbances on the incoming power line
that would otherwise exceed predetermined limits. The circuit
includes a full~wave rectifier 10 operative to receive an
alternating current signal for conversion to a pulsating
unidirectional power signal which is supplied to a series
circuit including the resistive load 12, a transistor 14 and a
sampling resistor 16. A control signal developed across the
sampling resistor 16 is supplied to a pulse width modulator 18
which has its output connected to the base of transistor 14
whereby the pulsating unidirectional power signal is chopped
into pulses that have a high frequency relative to that of the
alternating current signal and have uniform duration through a
given cycle of the alternating current signal whereby a power
factor approaching one is achieved.

Volume 3 Number 6 November/December 1978 453

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