LIGHT-EMITTING DIODE LIGHTING DEVICE, LIGHT FIXTURE AND LIGHT SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting diode lighting device that is of an inverter system, accurately detects a current flowing through a light-emitting diode and controls an inverter circuit in accordance with a detection result.

SOLUTION: A feedback control circuit 30 of a light-emitting diode lighting device 110 comprises a first series circuit of a rectification circuit 6 and a coupling capacitor 11, a second series circuit composed of a diode 21 series-connected with a side of the rectification circuit 6 of the first series circuit and a current detecting resistor 18 having one end connected with the diode 21 and the other end connected with reference potential, and a reverse polarity diode 24 which is connected in parallel with the second series circuit and has reverse polarity with respect to the diode 21. The feedback control circuit detects a voltage generated in the current detecting resistor 18 of the second series circuit as a diode current corresponding voltage corresponding to a current flowing through the light-emitting diode 7. An inverter control circuit 5 controls an inverter circuit 3 based on the voltage detected from the feedback control circuit 30 and the reference voltage.

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