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Switching battery charging systems and methods

  • US 20070188134A1
  • Filed: 02/16/2006
  • Published: 08/16/2007
  • Est. Priority Date: 02/16/2006
  • Status: Active Grant
First Claim
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1. A Universal Serial Bus (USB) battery charger comprising:

  • a switching regulator having at least one switching transistor, the switching transistor having first input and a first output, wherein the first input of the switching transistor is coupled to a USB power source;

    a filter having a first input and a first output, wherein the first input of the filter is coupled to the first output of the switching transistor; and

    a battery coupled to the first output of the filter, wherein the switching regulator is configured to receive a USB voltage, and in accordance therewith, generate a switching signal to the control terminal of the switching transistor, and wherein a switching current and switching voltage at the output of the switching transistor are coupled through the filter to generate a filtered current and a filtered voltage to charge the battery.

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