INDUCTION HEATING COOKER AND CONTROL CIRCUIT THEREFOR

  • US 20130008892A1
  • Filed: 09/14/2012
  • Published: 01/10/2013
  • Est. Priority Date: 01/07/2008
  • Status: Active Grant
First Claim
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1. A control circuit for controlling an induction heating cooker, which comprises an inductive coil and a switch element, wherein the inductive coil is coupled between a power voltage and a first terminal of the switch element, and a second terminal of the switch element is coupled to a common voltage, the control circuit comprising:

  • a first comparator having a first input terminal coupled to a first terminal of the inductive coil, a second input terminal coupled to a second terminal of the inductive coil, and an output terminal for outputting a trigger signal;

    a second comparator having a first input terminal coupled to a first reference voltage, a second input terminal coupled to the first terminal of the switch element, and an output terminal for outputting a fading signal, which is enabled when a voltage of the second input terminal is higher than the first reference voltage;

    a pulse generator for outputting a pulse to control the switch element when the trigger signal is changed from a second logic level to a first logic level, and for reducing a pulse width of the pulse when the fading signal is enabled; and

    a pulse phase control circuit, which is coupled to the pulse generator and is for controlling the pulse outputted from the pulse generator to have a high potential or a low potential.

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