| 摘要 |
A drive circuit for light-emitting diode (LED) lighting apparatus is disclosed. The power circuit that drives multiple interconnected light-emitting diode basically is a switching power supply and comprises a pulse width control IC, a pulse transformer and an output conversion circuit. The drive circuit provides the operating voltage for multiple light-emitting diodes. The pulse width control IC takes the output current from the output conversion circuit as feedback control signal, such that when the output current from the output conversion circuit increases, the pulse width control IC corrects the pulse width on the output to cause a decrease in voltage output to control the current output and to extend the service life of light-emitting diode.
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