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Power supply circuit comprising detection circuit including reference voltage circuits as reference voltage generation circuits

  • US 8,704,504 B2
  • Filed: 08/19/2011
  • Issued: 04/22/2014
  • Est. Priority Date: 09/03/2010
  • Status: Active Grant
First Claim
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1. A power supply circuit comprising:

  • a control circuit comprising;

    a detection circuit including a first reference voltage generation circuit, a second reference voltage generation circuit, and an input signal adjustment circuit;

    an error amplifier circuit;

    a pulse width modulation driver;

    a triangle-wave generation circuit; and

    a capacitor,an amplifier circuit electrically connected to the control circuit that outputs an output voltage; and

    a divider circuit that is electrically connected to the control circuit and the amplifier circuit and inputs a voltage obtained by dividing the output voltage as a feedback voltage to the second reference voltage generation circuit,wherein the input signal adjustment circuit comprises a first operational amplifier having a first non-inverting input terminal electrically connected to a first resistor and a second resistor and a first inverting input terminal electrically connected to a third resistor and a fourth resistor, andwherein the first reference voltage generation circuit comprises a second operational amplifier having a second non-inverting input terminal electrically connected to a fifth resistor and a first diode and a second inverting input terminal electrically connected to a sixth resistor, the sixth resistor is electrically connected to a second diode, and the first diode and the second diode are applied with a power source voltage, andwherein the second reference voltage generation circuit comprises a third operational amplifier having a third non-inverting input terminal electrically connected to a seventh resistor and a third diode and a third inverting input terminal electrically connected to an eighth resistor, the eighth resistor is electrically connected to a fourth diode, and the third diode and the fourth diode are applied with the feedback voltage.

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