Power Supply Device, Luminaire, and Lighting System

A luminaire comprising:

• a power supply device;
• and
• a lighting load supplied with electric power from the power supply device,
• the power supply device including
• a terminal connected to an output side of a dimmer connected to an alternating-current power supply,
• a rectifier circuit,
• a switching circuit including an inductor, a switching element connected to the inductor in series, and a first rectifying element, one end of the first rectifying element being connected between the inductor and the switching element, the switching circuit configured to change the switching element to an ON state to feed an output current of the rectifier circuit to the inductor, after the dimmer changes from a non-conduction state to a conduction state, when the dimmer is a dimmer of a phase control type, and the switching circuit configured to change the switching element to the ON state to feed the output current of the rectifier circuit to the inductor, after the dimmer changes from the conduction state to the non-conduction state, when the dimmer is a dimmer of an anti-phase control type, and
• a DC-DC converter configured to convert the output voltage of the switching circuit.

A lighting system comprising:

• a luminaire including
• a power supply device, and
• a lighting load supplied with electric power from the power supply device;
• and
• a dimmer configured to supply a phase-controlled alternating-current voltage to the power supply device,
• the power supply device including
• a terminal connected to an output side of a dimmer connected to an alternating-current power supply,
• a rectifier circuit,
• a switching circuit including an inductor, a switching element connected to the inductor in series, and a first rectifying element, one end of the first rectifying element being connected between the inductor and the switching element, the switching circuit configured to change the switching element to an ON state to feed an output current of the rectifier circuit to the inductor, after the dimmer changes from a non-conduction state to a conduction state, when the dimmer is a dimmer of a phase control type, and the switching circuit configured to change the switching element to the ON state to feed the output current of the rectifier circuit to the inductor, after the dimmer changes from the non-conduction state to the conduction state, when the dimmer is a dimmer of an anti-phase control type, and
• a DC-DC converter configured to convert the output voltage of the switching circuit.