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High-Efficiency, Low-Power Power Supply Circuit

  • US 20140043878A1
  • Filed: 08/08/2012
  • Published: 02/13/2014
  • Est. Priority Date: 08/08/2012
  • Status: Active Grant
First Claim
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1. A circuit for charging a capacitor, wherein the capacitor has first lead coupled to an output voltage VO node, and wherein the capacitor has a second lead coupled to a GND node, the circuit comprising:

  • a full wave bridge rectifier that supplies a rectified voltage signal (VR) onto a VR node, and that supplies a ground potential GND onto the GND node; and

    a charging circuit that;

         1) decouples the VO node from the VR node when VR is greater than a first predetermined voltage VP and,

         2) supplies a charging current (ICHARGE) from the VR node and onto the VO node when VR is less than VP provided that VO is less than a second predetermined voltage VO(MAX) and provided that VR is greater than VO.

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