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DC-DC converter with improved dynamic response

  • US 8,054,058 B2
  • Filed: 04/17/2008
  • Issued: 11/08/2011
  • Est. Priority Date: 04/17/2007
  • Status: Active Grant
First Claim
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1. A method for minimizing the output voltage deviation of a DC-DC converter in response to a load current step;

  • comprising;

    (i) detecting a load current step to a new load current by estimating or detecting a change in stored charge of a parallel output capacitor of the DC-DC converter;

    (ii) modulating a duty cycle of the DC-DC converter to change current through a series output inductor, such current being different than the new load current; and

    (iii) modulating the duty cycle of the DC-DC converter to simultaneously cause (a) the inductor current to be equal the new load current and (b) the stored charge of the parallel output capacitor to be substantially returned to a state prior to the load current step;

    wherein estimating or measuring includes using a double integrator.

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