| 摘要 |
PROBLEM TO BE SOLVED: To obtain SEPIC type power supply device and lighting fixture in which lowering of power factor can be suppressed by suppressing distortion of an input current waveform, while suppressing the harmonic current sufficiently.SOLUTION: In a converter 3, one end of an inductor L1 is connected with the positive potential side terminal of a smoothing capacitor C1. One end of a coupling capacitor C2 is connected with the other end of the inductor L1. A switching element SW is connected between the other end of the inductor L1 and the negative potential side terminal of the smoothing capacitor C1. One end of an inductor L2 is connected with the other end of the coupling capacitor C2, and the other end is connected with the negative potential side terminal of the smoothing capacitor C1. Anode of a diode D1 is connected with the other end of the coupling capacitor C2. In a path for outputting charges from the smoothing capacitor C1 to a converter 3, the anode of a diode D2 is connected with the positive potential side terminal of the smoothing capacitor C1, and the cathode is connected with the positive potential side terminal of the switching element SW.SELECTED DRAWING: Figure 1 |
