AC/DC power circuit

AC/DC power circuit

  • CN 1,908,843 B
  • Filed: 08/07/2006
  • Issued: 05/20/2015
  • Est. Priority Date: 08/07/2006
  • Status: Active Grant
First Claim
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1. a power circuit, is characterized in that, it includes:

  • One input transistors, couples a voltage source;

    One the first transistor, is series at this input transistors to provide a supply voltage;

    One input circuit for detecting, is coupled to this voltage source and controls signal to produce one according to the voltage quasi position of this voltage source;

    One transistor seconds, is coupled to this input circuit for detecting, this input transistors and this first transistor, and when the voltage quasi position of this voltage source is higher than a critical voltage, this transistor seconds ends this input transistors and this first transistor according to this control signal;

    One exports circuit for detecting, is coupled to this supply voltage and produces one first enable signal and one second enable signal with the voltage quasi position according to this supply voltage;

    One impedance means, is coupled to this input transistors and this first transistor, to provide bias voltage and this input transistors of conducting and this first transistor;

    Wherein, when the voltage quasi position of this supply voltage is higher than a high output voltage level, this first enable signal ends this input transistors and this first transistor, and the voltage quasi position of this supply voltage ends the output of this power circuit lower than this second enable signal during a low output voltage level.

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