Method of and apparatus for deriving information, electric...

Details Method of and apparatus for deriving information, electric... Method of and apparatus for deriving information, electric...

2005-08-16

2005-08-16

Tran, Hoan (Department: 2852)

Electrophotography

Machine operation

Having power supply

C323S282000

Reexamination Certificate

active

06931222

ABSTRACT:
An AC power source supplies power to a switching power source and a fixing heater. A power source waveform detecting circuit obtains a voltage waveform of the AC power source at a predetermined timing after the main power switch is turned on. A processor derives zero crossing information concerning zero crossing such as a zero crossing point based on the obtained voltage waveform. The processor controls power supply to the fixing heater based on the derived zero crossing information.

REFERENCES:
patent: 5802421 (1998-09-01), Miura
patent: 5994671 (1999-11-01), Suzuki et al.
patent: 6111230 (2000-08-01), Cao et al.
patent: 6157010 (2000-12-01), Mine
patent: 8-308215 (1996-11-01), None
patent: 2002-268450 (2002-09-01), None

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