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DC-DC converter with improved dynamic response

  • US 20080258701A1
  • Filed: 04/17/2008
  • Published: 10/23/2008
  • 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;

    (A) (i) detecting a positive load current step to a new load current, the positive load current step removing at least a portion of the stored charge from a parallel output capacitor of the DC-DC converter;

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

    (iii) decreasing the duty cycle of the DC-DC converter to simultaneously cause (a) the inductor current to decrease to be equal the new load current and (b) the at least a portion of the stored charge removed from the parallel output capacitor during the positive load current step to be replaced; and

    /or(B) (i) detecting a negative load current step to a new load current, the negative load current step adding charge to the stored charge of a parallel output capacitor of the DC-DC converter;

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

    (iii) increasing the duty cycle of the DC-DC converter to simultaneously cause (a) the inductor current to increase to be equal the new load current and (b) the charge added to the parallel output capacitor during the negative load current step to be removed.

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