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Master/slave outlet system

  • US 7,772,718 B2
  • Filed: 06/30/2008
  • Issued: 08/10/2010
  • Est. Priority Date: 04/09/2008
  • Status: Active Grant
First Claim
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1. A master/slave outlet system, which comprises:

  • an alternative current (AC) plug for receiving AC power;

    at least one master outlet, coupled to the AC plug;

    at least one salve outlet;

    a power switch, whose first end is coupled to the AC plug, and whose second end is coupled to the slave outlet;

    a current sensor, coupled to the master outlet, for receiving a feedback current from the master outlet and for outputting a sensing signal;

    an operational amplifier, coupled to the current sensor, in which the operational amplifier is used for amplifying and comparing the sensing signal with a first reference voltage to output a first control signal, and for amplifying and comparing the sensing signal with a second reference voltage to output a second control signal;

    a power supply, coupled to the AC plug, operational amplifier and power switch, which is controlled by the first control signal, so as to convert the AC power into a supply voltage to provide to the power switch; and

    a driver, coupled to the operational amplifier and power switch, which receives the second control signal and outputs a driving signal to the power switch, so as to control the power switch.

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