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Circuit for adjusting the output voltage for a resonant DC/DC converter

  • US 8,406,014 B2
  • Filed: 12/29/2006
  • Issued: 03/26/2013
  • Est. Priority Date: 12/30/2005
  • Status: Active Grant
First Claim
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1. A method for controlling a resonant DC/DC converter, which adjusts an output voltage by changing a turn-on frequency of at least one input switch device of a resonant circuit of the converter, comprising:

  • adjusting a duty ratio of the at least one input switch device based on a feedback signal from a load circuit wherein the at least one input switch device of the resonant circuit is controlled by a driving pulse through a drive circuit, where acquisition of the driving pulse includes;

    acquiring the feedback signal of the load circuit;

    determining based on the feedback signal whether the load operates at a light load or non-load state; and

    using a pulse signal as the driving pulse of the drive circuit wherein both the frequency and the duty ratio are adjusted in accordance with a change in the feedback signal if the load operates in a range of between the light load and the non-load state so as to have the resonant circuit operate in a combined mode of pulse width modulation (PWM) control and pulse frequency modulation (PFM) control; and

    otherwise using a pulse signal as the driving pulse of the drive circuit wherein the duty ratio is stable and the frequency varies in accordance with the change of the feedback signal, so as to have the resonant circuit operate in a PFM control mode.

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