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Ultralow Power stan-By Supply

  • US 20080049452A1
  • Filed: 10/25/2005
  • Published: 02/28/2008
  • Est. Priority Date: 10/28/2004
  • Status: Abandoned Application
First Claim
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1. A switched mode power supply for conversion of an input voltage into at least one output voltage comprising:

  • an inductive device (3;

    30) for transforming the input voltage present at at least one input (1) of the power supply into the at least one output voltage provided at at least one output (2) of the power supply, a switching device (4;

    40) for periodically coupling the inductive device (3;

    30) to the input voltage, a controller (5;

    50) coupled to the switching device (4;

    40) for controlling the switching of the switching device, characterized by an auxiliary voltage supply (6;

    60) for supplying electrical energy to at least the controller (5;

    50), and a feedback device (7;

    70) coupled to the at least one output (2), which feedback device is arranged to provide a first signal corresponding to the output voltage to the auxiliary voltage supply (6;

    60), wherein the auxiliary voltage supply (6;

    60) is arranged to reduce its supply of electrical energy to the controller (5;

    50) in response to an increase of the output voltage according to the first signal from the feedback device (7;

    70).

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