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Energy-saving dimming apparatus

  • US 6,858,995 B2
  • Filed: 03/18/2003
  • Issued: 02/22/2005
  • Est. Priority Date: 03/18/2002
  • Status: Expired due to Fees
First Claim
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1. An energy-saving dimming apparatus connected to a power source and a load, and adapted to control a luminance of the load, comprising:

  • a first switching unit connected to a power supply line;

    a second switching unit connected between the first switching unit and a ground line;

    a microprocessor for generating a square-wave pulse having a duty cycle according to a luminance control command;

    a switch driver for generating switching control signals respectively adapted to perform alternate ON/OFF controls for the switching units in accordance with the square-wave pulse inputted thereto;

    a low-pass filter for removing ripple components contained in a voltage applied to the load via the first switching unit; and

    a level amplifier for amplifying a level of the square-wave pulse.

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