Lighting power source and luminaire

摘要

A lighting power source according to an embodiment includes a rectification circuit (9), a smoothing capacitor (40), a waveform shaping circuit (10), and a DC-DC converter (11). The rectification circuit (9) rectifies an AC voltage input thereto. The waveform shaping circuit (11) is connected between the rectification circuit (9) and the smoothing capacitor (40), performs a switching operation to repeat an ON state and an OFF state when the voltage output from the rectification circuit (9) is relatively high, continues to be in the ON state to allow the current to flow to the rectification circuit (9) when the voltage output from the rectification circuit (9) is relatively low. The DC-DC converter (11) converts a voltage charged in the smoothing capacitor (40).