Browse Prior Art Database

FUSER CONTROL CIRCUIT WITH FULL CYCLE CONTROL

IP.com Disclosure Number: IPCOM000024764D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 56K

Publishing Venue

Xerox Disclosure Journal

Abstract

A fuser controller circuit provides constant RMS voltage over the line voltage range to the radiant fusing element. At line voltages higher than the fuser setpoint voltage, regulation is achieved by periodically omitting a full cycle to maintain a constant RMS voltage across the fuser element.

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XEROX DISCLOSURE JOURNAL

FUSER CONTROL CIRCUIT WITH FULL CYCLE CONTROL
Terrence S. Tickle

Proposed Classification
U.S. CI. 355/14 FU Int. C1. G03g 15/00

A fuser controller circuit provides constant RMS voltage over the line voltage range to the radiant fusing element. At line voltages higher than the fuser setpoint voltage, regulation is achieved by periodically omitting a full cycle to maintain a constant RMS voltage across the fuser element.

The fuser voltage is sensed and converted to an RMS DC control signal via the incandescent lamp/silicon cell/current amplifier. An integrated circuit is used to generate zero crossing pulses and +/- 6 VDC supplies. The full cycle control circuit was designed to allow omission of only full cycles.

A silicon cell voltage sensor will eliminate handling and stability problems associated with a CdS cell used in the fuser regulator circuit. Integral cycle omission ensures machine fuser regulator would not create a DC bias on the power lines.

A circuit to aid the technical representative in diagnosis of a fuser control PWBA failure verses a fuser traic failure is also included on the fuser control PWBA. When a particular connector is disconnected, the technical representative will measure a specified voltage indicating the presence of triac gate pulses.

Volume 6 Number 6 November/December 1981 38 1

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DISCLOSURE XEROX 382 JOURNAL

Volume 6 Number 6 November/December 1...