| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a such a lighting control device for a luminaire as being capable of preventing the influence of electric failure even if a commercial power supply is in electric failure in the ambient darkness. SOLUTION: This device has a circuit 18 to supply DC power from a commercial power supply C, a circuit 16 to supply DC power when in electric failure, a circuit 11 to generate a detection signal corresponding to ambient brightness, a control part (a circuit 12 and elements 13, 14) to find out the detection signal from the circuit 11 to be at a preset value or less and supply the power supply C to a bulb A when a dark condition is detected and an electric failure detection part (a switch 15, a circuit 17 and an element 19) to supply DC power from the circuit 18 to the circuits 11, 12 when the power supply C is detected to be normal and generate a detection signal showing the detection result and supply DC power from the circuit 16 to the circuits 11, 12 when it is detected to be in electric failure. The control part supplies DC power from the circuit 16 to a bulb B when ambient darkness is detected after receiving the detection signal for electric failure.</p> |
