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Electronic power-saving power control circuit

  • US 20040218325A1
  • Filed: 04/29/2003
  • Published: 11/04/2004
  • Est. Priority Date: 04/29/2003
  • Status: Active Grant
First Claim
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1. An electronic power-saving power control circuit connected between a single-phase power supply and a lighting fixture for controlling the output of power supply to the lighting fixture, comprised of a CPU (central processing unit), a power voltage detector, a silicon controlled semiconductor circuit, a current phase detector, a trigger circuit, a resistor, a current detector, and a DC power supply circuit, wherein:

  • said CPU is the control center of the power-saving power control circuit, and adapted to turn on said silicon controlled semiconductor circuit subject to the triggering angle required for a predetermined voltage drop and the time in which the electric current detected by said current phase detector is zeroed when received a power voltage from said power voltage detector, causing said silicon controlled semiconductor circuit to provide a power output to said lighting fixture;

    said voltage detector detects the voltage level of said single-phase power supply, providing the information of detection result to said CPU;

    said silicon controlled semiconductor circuit is a circuit formed of a silicon controlled semiconductor and a protection circuit and connected in series between said single-phase power supply and said lighting fixture for working with said current phase detector and said trigger circuit to control power output to said lighting fixture;

    said current phase detector detects the time where the electric current passing through said silicon controlled semiconductor is zeroed, and provides the detection information to said CPU for triggering said silicon controlled semiconductor;

    said trigger circuit is adapted to trigger said silicon controlled semiconductor circuit for output of power supply to said lighting fixture subject to the control of said CPU;

    said resistor is electrically connected between said single-phase power supply and said lighting fixture, and adapted to cause a voltage drop upon passing of the electric current;

    said current detection circuit detects the value of the electric current passing through said resistor subject to the voltage drop at the resistor and, provides the measured current value to said CPU.

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