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Computer system including power supply circuit with controlled output power

  • US 6,003,139 A
  • Filed: 01/27/1998
  • Issued: 12/14/1999
  • Est. Priority Date: 09/26/1996
  • Status: Expired due to Term
First Claim
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1. A computer system comprising:

  • a computer system unit;

    a power supply circuit coupled to receive input power and generate output power, the power supply circuit including a circuit to generate a control signal related to the power level of the input power, the control signal having a first value relative to an input signal if the input signal level exceeds a selected threshold level and the control signal having a second value relative to the input signal if the input signal level does not exceed the selected threshold level, wherein the power level of the output power is controlled so that it does not exceed a maximum power level which is based on the level of the control signal; and

    a plurality of power-consuming elements housed within the computer system unit, the power consuming elements being powered by the output power from the power supply circuit;

    wherein the power supply circuit comprises;

    a rectifier;

    a current detector with an input coupled to the rectifier;

    a voltage detector with an input coupled to the rectifier;

    a divider circuit with an input coupled to an output of the voltage detector;

    a multiplier with a first input coupled to an output of the divider circuit and a second input coupled to an output of the current detector;

    a comparator with an input coupled to an output of the multiplier; and

    an AC-DC converter with a signal input coupled to the rectifier and a control input coupled to an output of the comparator.

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