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Power supply apparatus and heating apparatus and image forming apparatus

  • US 20060093388A1
  • Filed: 10/21/2005
  • Published: 05/04/2006
  • Est. Priority Date: 10/29/2004
  • Status: Active Grant
First Claim
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1. A power supply apparatus comprising:

  • a voltage detecting section for outputting a first pulse signal which is at a first voltage level when the AC power supply voltage is below a specified threshold value, and at a second voltage level when the AC power supply voltage exceeds the specified threshold value; and

    a power control section for controlling supplied power in response to the first pulse signal fed from said voltage detecting section, wherein said power control section successively measures a period of an edge in one direction of the first pulse signal fed from said voltage detecting section, sets a set time period at a time period equal to half the period of the edge in one direction, and controls a switching device for switching between turning-on and turning-off of said AC power supply in accordance with timing of the edge in one deirection and timing when the set time period has elapsed after the edge in one direction.

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