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ENERGY CONSERVING (STAND-BY MODE) POWER SAVING DESIGN FOR BATTERY CHARGERS AND POWER SUPPLIES

  • US 20090224603A1
  • Filed: 08/21/2008
  • Published: 09/10/2009
  • Est. Priority Date: 03/07/2008
  • Status: Active Grant
First Claim
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1. A power supply apparatus connectable/disconnectable to a DC device at a single output, comprising:

  • a first AC to DC power supply for supplying power to the device, producing a first power level and having an AC power source input; and

    a control circuit for turning the first power supply on and off when the device is disconnected from the apparatus and when the device is recharged said control circuit comprising;

    a second AC to DC power supply producing a second power level less than the first power level;

    a first diode (anode) connected to the first power supply;

    a shunt resistor connected between the first diode (cathode) and the output;

    a second diode connected between the second power supply (anode side) and both the shunt resistor and the first diode (cathode side), second diode cathode;

    a current shunt monitoring circuit connected across the shunt resistor and producing a control signal; and

    a solid state normal open relay connected to the AC power source input of the first power supply, connected to the current shunt monitoring circuit and controlled by the control signal.

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