LIGHTING APPARATUS, DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND DRIVING METHOD THEREOF
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United States of America Patent
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N/A
Issued Date -
May 5, 2011
app pub date -
Dec 21, 2009
filing date -
Nov 3, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A driving circuit suitable for receiving an alternating current (AC) power to drive a light emitting diode (LED) is provided. The driving circuit includes a rectifier circuit, a process unit, an electric energy conversion circuit, and a detection unit. The rectifier circuit rectifies the AC power to output a first operating voltage. The processing unit is coupled to the rectifier circuit and outputs a second operating voltage and a pulse width modulation (PWM) signal. The electric energy conversion circuit is coupled between the rectifier circuit, the processing unit and the LED and drives the LED according to the PWM signal. The detection unit is coupled to the rectifier circuit and the processing unit and detects the first operating voltage. When the first operating voltage is lower than or equal to a threshold voltage, the detection unit outputs a disable signal to the processing unit to disable the PWM signal.
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