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Online Voltage Adjustment Circuit for Board Power Supply

  • US 20190271999A1
  • Filed: 05/17/2019
  • Published: 09/05/2019
  • Est. Priority Date: 11/17/2016
  • Status: Active Grant
First Claim
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1. An online voltage adjustment circuit for a board power supply, comprising:

  • a first switch;

    a first bias resistor, wherein a first end of the first bias resistor is configured to couple to an output pin of the board power supply;

    a first voltage division element coupled in series to the first switch to form a first voltage division circuit, wherein the first voltage division circuit is coupled in parallel to the first bias resistor;

    a second switch;

    a second bias resistor, wherein a first end of the second bias resistor is configured to couple to a ground pin of the board power supply;

    a second voltage division element coupled in series to the second switch to form a second voltage division circuit, wherein the second voltage division circuit is coupled in parallel to the second bias resistor,wherein the first bias resistor is further configured to couple in series to the second bias resistor,wherein the first voltage division circuit is further configured to couple in series to the second voltage division circuit,wherein a first coupling point couples the first voltage division circuit and the second voltage division circuit, wherein a second coupling point couples the first bias resistor and the second bias resistor, and wherein the second coupling point is configured to couple the first coupling point to a feedback pin of the board power supply;

    a control chip coupled to the first switch and the second switch; and

    a detection chip, wherein a first end of the detection chip is coupled to the output pin, wherein a second end of the detection chip is coupled to the control chip, and wherein the detection chip is configured to obtain an initial output voltage of the output pin, andwherein the control chip is configured to;

    control, based on the initial output voltage and a preset voltage, the first switch and the second switch; and

    adjust the initial output voltage to a target voltage.

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