Image fusing device and image forming apparatus

Details Image fusing device and image forming apparatus Image fusing device and image forming apparatus

2006-11-21

2006-11-21

Chen, Sophia S. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

C219S216000, C399S328000, C399S088000, C315S291000, C363S019000

Reexamination Certificate

active

07139500

ABSTRACT:
This invention is intended to control the amount of power to be supplied to a fusing heater below a maximum applicable current value. The engine controller supplies electricity to both of two heating bodies at the same fixed duty D1.At a phase angle α1corresponding to the fixed duty D1,pulse signals ON1and ON2are issued in response to a ZEROX signal as a trigger. A current value I1is detected based on a HCRRT signal from the current detection circuit. The engine controller calculates an upper limit of applicable power duty Dlimit based on the detected current value I1,the fixed duty D1and the preset applicable current value Ilimit. Then, a PI temperature control is performed at a duty below the upper limit duty Dlimit.

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