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INTEGRATED ON-TIME EXTENSION FOR NON-DISSIPATIVE BLEEDING IN A POWER SUPPLY

  • US 20110193494A1
  • Filed: 02/09/2010
  • Published: 08/11/2011
  • Est. Priority Date: 02/09/2010
  • Status: Active Grant
First Claim
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1. A controller for a switched mode power supply, the controller comprising:

  • a zero-crossing detector coupled to generate a first signal prior to a zero-crossing of an input voltage of the power supply;

    drive logic to be coupled to generate a drive logic output signal in response to a feedback signal representative of an output of the power supply, wherein the drive logic output signal is representative of an initial on-time; and

    an on-time extension block coupled to the zero-crossing detector and the drive logic to generate a drive signal in response to the drive logic output signal, the drive signal to control switching of a switch to be coupled to the controller to remove charge from a filter capacitor of the power supply, wherein the drive signal is representative of a total on-time of the switch equal to a sum of the initial on-time and an extended on-time, wherein the extended on-time is responsive to the first signal.

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