Patent ID: 10390401

Abstract:
A lighting control device includes a bidirectional switch, an inputter, a controller, and a corrector. The bidirectional switch is configured to switch between conduction and non-conduction of a bidirectional current between a pair of input terminals. The inputter is configured to receive a dimming level specifying the magnitude of a light output of a load. The controller is configured to control the bidirectional switch so as to retain the bidirectional switch in an ON state for an on time having a length determined in accordance with the dimming level within a prescribed range in each of half periods of an AC voltage of an AC power supply. The corrector is configured to (i) determine whether or not a target waveform has an anomaly with reference to a prescribed determination condition, and (ii) correct the prescribed range so as to narrow the prescribed range when the target waveform has the anomaly; wherein the target waveform is a waveform of at least one of a voltage and a current input to the pair of input terminals.