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VOLTAGE CONVERTER WITH COMBINED CAPACITIVE VOLTAGE DIVIDER, BUCK CONVERTER AND BATTERY CHARGER

  • US 20090033293A1
  • Filed: 07/23/2008
  • Published: 02/05/2009
  • Est. Priority Date: 08/01/2007
  • Status: Abandoned Application
First Claim
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1. A voltage converter, comprising:

  • a first capacitor coupled between a reference node and a first output node wherein said first output node develops a first output voltage;

    a second capacitor coupled between an input node and either one of said reference and first output nodes;

    a third capacitor having first and second ends;

    a switch circuit which couples said first and second ends of said third capacitor to said reference node and said first output node, respectively, in a first state of a pulse width modulation signal, and which couples said first and second ends of said third capacitor to said first output node and said input node, respectively, in a second state of said pulse width modulation signal;

    an inductor having a first end coupled to said first end of said third capacitor and having a second end forming a second output node providing a second output voltage;

    a fourth capacitor coupled between said reference node and said second output node; and

    a controller which controls duty cycle of said pulse width modulation signal between said first and second states to regulate said second output voltage to a predetermined output voltage level, and which provides a voltage control signal to control voltage of an input voltage provided on said input node to maintain said first output node between a predetermined minimum battery voltage level and a predetermined maximum battery voltage level.

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