| 摘要 |
1 The invention provides a light emitting device driving circuit, comprising a 2 rectification unit, a current limiting unit and a load. The load comprises a first light 3 emitting device, a reverse voltage providing unit and a second light emitting device 4 connected in serial. When the rectification unit rectifies an alternate current voltage to 5 output a direct current voltage, and the current limiting unit limits the direct current in 6 a predetermined value, the direct current is provided to the first light emitting device 7 or the second light emitting device for operation. The reverse voltage providing unit 8 provides a reverse voltage to reduce the total operating voltage of the light emitting 9 devices in order to enhance the driving efficiency and the power factor. current limiting unit first light emitting device / AC rect if ication unit reverse voltage providing unit / second light emitting device' Fig. I |
