Patent ID: 9705281
Date: 2017-07-11
CPC Classifications: H01S,H05B,Y02B

Claim:
1. A semiconductor light source driving apparatus comprising: a switching power supply that supplies a DC voltage; a first switching device that switches on/off an output of a positive terminal of the switching power supply in accordance with an input PWM signal; an inductor having a first end connected to an output of the first switching device; a second switching device connected between a second end of the inductor and a negative terminal of the switching power supply, the second switching device being switched on/off in accordance with an inversion of the input PWM signal; a semiconductor light source device connected between the second end of the inductor and the negative terminal of the switching power supply; and a free-wheeling diode to which the first end of the inductor and the negative terminal of the switching power supply are connected.