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Burst-mode control method for low input power consumption in resonant converters and related control device

  • US 9,698,688 B2
  • Filed: 09/04/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 07/16/2012
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • controlling burst-mode operation of a resonant converter having an oscillator configured to set a switching frequency of on-off driven power switches of the resonant converter in response to a feedback control signal based on an output error voltage of the converter;

    operating the oscillator, when a load on the converter is light, relative to a maximum capacity of the converter, in a hysteretically controlled burst-mode including causing said oscillator to stop oscillating when said feedback control signal reaches a first threshold value; and

    introducing a discontinuity in at least one of;

    a functional relation between the switching frequency and said feedback control signal, or a derivative of the functional relation between the switching frequency and said feedback control signal, the discontinuity being introduced while the feedback control signal is between a lower, second threshold value, and the first threshold value and while the oscillator is not in the burst-mode, such that the switching frequency remains equal to or smaller than a value of the switching frequency when the feedback control signal is equal to the second threshold value.

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