| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED driving circuit with a simple circuit structure, capable of maintaining a suitable minimum holding current of a light control circuit, according to an ON phase angle of AC voltage phase-controlled by the light control circuit.SOLUTION: A holding current control circuit 7 is connected between a waveform shaping circuit 4 and a constant current control circuit 6. The holding current control circuit 7 generates a control signal E for controlling a holding current of the light control circuit 2 according to the ON phase angle controlled by the light control circuit 2 when a pulse signal D formed in the waveform shaping circuit 4 is inputted. The holding current of the light control circuit 2 is controlled by allowing a pulse current superimposed on a light control current outputted from the light control circuit 2 to flow according to the control signal E. |
