| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting device and the like which allows for stabilized lighting of solid light-emitting elements having different characteristics, where variation of optical output is suppressed with simple configuration.SOLUTION: A lighting device 1a for lighting an LED 4 includes a DC power supply C1, a back converter 3, and a control circuit 5. The back converter 3 has a switching element Q1, an inductor L1, and a diode D1. The control circuit 5 has a current detection circuit 6 for detecting a current flowing through the switching element Q1, a voltage detection circuit 8 for detecting the voltage across the inductor L1, a delay circuit 9 for generating a delay time depending on the voltage detected by the voltage detection circuit 8, and a drive circuit 10 generating a control signal for turning the switching element Q1 off upon elapsing a delay time generated from the delay circuit 9, after a time when a current detected by the current detection circuit 6 has reached a predetermined current command value, and outputting the control signal to the switching element Q1.</p> |
