Control circuit for heat fixing device for use in an image formi

Details Control circuit for heat fixing device for use in an image formi Control circuit for heat fixing device for use in an image formi

1989-02-28

1990-05-22

Wong, Peter S.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

323235, 323319, G05F 500

Patent

active

049280554

ABSTRACT:
A control circuit for heat fixing device for use in an image forming apparatus is disclosed. The control circuit comprises device for detecting a power source voltage, device for detecting zero-crossing points of the power source voltage, device for determining frequency of the source voltage from the detected zero-crossing points, device for determining a power supplying time based on the detected power supply voltage and the power source frequency, device for controlling the power supply to a load based on the determined power supply line, in such a manner that a given power is automatically applied to the load against the change or fluctuation of the power supply source.

REFERENCES:
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4377739 (1983-03-01), Eckert, Jr. et al.
patent: 4689548 (1987-08-01), Mechlenburg

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