DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND LIGHTING APPARATUS USING THE SAME
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United States of America Patent
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Issued Date -
Jul 7, 2011
app pub date -
Feb 25, 2010
filing date -
Jan 4, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A driving circuit of light emitting diodes (LEDs) and a lighting apparatus using the same are provided in the application. The driving circuit includes a rectifier unit, an isolation element, a processing unit and a voltage converter circuit. The rectifier unit is coupled to a triac dimmer and outputs a first operation voltage. The processing unit detects a conducting condition of the triac dimmer according to a voltage waveform of the first operation voltage and outputs a pulse width modulation signal to drive the LEDs according to the detected conduction condition, so that flash problems of the LEDs caused by operation voltage variation are prevented.
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