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Heater energization control circuit, heater energization control method, and image forming apparatus

  • US 20030136777A1
  • Filed: 01/16/2003
  • Published: 07/24/2003
  • Est. Priority Date: 01/22/2002
  • Status: Active Grant
First Claim
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1. A heater energization control circuit comprising:

  • means for supplying an alternating current to a heater;

    a first capacitor that charges and discharges in accordance with a first time constant that is determined by an electrostatic capacity of the first capacitor and a resistance value of a first resistor;

    a second capacitor that charges and discharges in accordance with a second time constant that is determined by an electrostatic capacity of the second capacitor and a resistance value of a second resistor; and

    means for determining an energization start timing to the heater in accordance with a size relationship between a voltage of the first capacitor and a voltage of the second capacitor, and starting to supply the alternating current to the heater by the means for supplying under this timing.

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