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AC-to-DC charge pump having a charge pump and complimentary charge pump

  • US 9,716,441 B2
  • Filed: 12/31/2012
  • Issued: 07/25/2017
  • Est. Priority Date: 08/14/2011
  • Status: Active Grant
First Claim
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1. An AC-to-DC charge pump comprising:

  • a charge pump operable to convert an AC (alternating current) input voltage into a DC (direct current) voltage, wherein the charge pump includes;

    a flying node capacitor;

    a fixed node capacitor;

    a first diode circuit;

    a second diode circuit;

    a third diode circuit; and

    an output capacitor, wherein a first node of the flying node capacitor is coupled to a positive leg of the AC input voltage (VINP) and a second node of the flying node capacitor is coupled to a flying node, wherein an anode of the first diode circuit is coupled to the VINP and a cathode of the first diode circuit is coupled to a bias node, wherein an anode of the second diode circuit is coupled to the bias node and a cathode of the second diode circuit is coupled to the flying node, wherein an anode of the third diode circuit is coupled to the flying node and a cathode of the third diode circuit is coupled to an output node, and wherein a first node of the output capacitor is coupled to the output node and a second node of the output capacitor is coupled to the middle rail; and

    a complimentary charge pump operable to convert the AC voltage into a complimentary DC voltage, wherein magnitude of the DC voltage is substantially equal to magnitude of the complimentary DC voltage and wherein the charge pump is coupled to the complimentary charge pump to add the DC voltage and the complimentary DC voltages to produce an output voltage, which has a middle rail that is coupled to a negative leg (VINN) of the AC input voltage.

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