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No load detection and slew rate compensation

  • US 9,711,990 B2
  • Filed: 06/21/2013
  • Issued: 07/18/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method of controlling an output voltage of a power converter, the method comprising:

  • a. while in a sleep mode, periodically turning a main switch ON and OFF according to a burst mode of operation and detecting a load condition at an output of the power converter comprising the main switch coupled to a primary side winding and the load coupled to a secondary side winding, wherein the load condition causes the output voltage to decrease at a first rate during a wake-up time period, wherein a rate is an amount of output voltage decrease during the wake-up time period divided by the wake-up time period;

    b. applying a plurality of slew rate compensation adjustments to a driving signal for the main switch of the power converter, wherein each slew rate compensation adjustment results in a voltage pull-up of the output voltage during the wake-up time period to decrease the first rate to a second rate at which the output voltage decreases during the wake-up period; and

    c. discontinuing application of the plurality of slew rate compensation adjustments and resuming regulation of the output voltage at a regulated output voltage level after the wake-up time period.

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