Energy-saving dimming apparatus

Details Energy-saving dimming apparatus Energy-saving dimming apparatus

2005-02-22

2005-02-22

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315SDIG004

Reexamination Certificate

active

06858995

ABSTRACT:
Disclosed is an energy-saving dimming apparatus connected to a power source and a load, and adapted to control a luminance of the load. The dimming apparatus includes 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, and a low-pass filter for removing ripple components contained in a voltage applied to the load via the first switching unit.

REFERENCES:
patent: 5416387 (1995-05-01), Cuk et al.
patent: 5583402 (1996-12-01), Moisin et al.
patent: 6008593 (1999-12-01), Ribarich
patent: 20030160579 (2003-08-01), Amith et al.

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