| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting device capable of suppressing overshoot in startup, and a lighting fixture.SOLUTION: A control circuit section 40a executes control for fixing an ON time length ton and a term T of a control signal in startup for raising a voltage in both terminals of a smoothing capacitor 17. Such control is implemented during a term T1. When the voltage in both the terminals of the smoothing capacitor 17 becomes equal to or higher than a target value V, the control circuit section 40a then switches to feedback control and implements known power factor improvement control. The feedback control is being implemented during a term T2. During the feedback control, at least either the ON time length ton or the term T of the control signal is variable and a voltage value detected by potential dividing circuits of resistors 15 and 16 is fed back to a control signal of a switching element 11 in such a manner that the voltage in both the terminals of the smoothing capacitor 17 is matched with the target value V.</p> |
