LIGHTING DEVICE AND LUMINAIRE

摘要

A lighting device includes a constant-current circuit, a smoothing capacitor, a bypass circuit, a detection unit, and a bypass control unit. The constant-current circuit supplies a constant current to a plurality of solid-state light-emitting elements connected in series. The smoothing capacitor is connected between output terminals of the constant-current circuit. The bypass circuit is connected in parallel to one or more of the plurality of solid-state light-emitting elements. The detection unit detects whether the one or more solid-state light-emitting elements are open-circuited. When the detection unit detects that at least one of the one or more solid-state light-emitting elements is open-circuited, the bypass control unit discharges the smoothing capacitor during a discharge period to then bypass the one or more solid-state light-emitting elements through the bypass circuit.

主权项

1. A lighting device, comprising:
a constant-current circuit configured to supply a constant current to a plurality of solid-state light-emitting elements connected in series; a smoothing capacitor connected between output terminals of the constant-current circuit; a bypass circuit connected in parallel to one or more of the plurality of solid-state light-emitting elements, the bypass circuit configured to bypass the one or more solid-state light-emitting elements; a detection unit configured to detect whether the one or more solid-state light-emitting elements are open-circuited; and a bypass control unit configured to, when the detection unit detects that at least one of the one or more solid-state light-emitting elements is open-circuited, discharge the smoothing capacitor during a discharge period to then bypass the one or more solid-state light-emitting elements through the bypass circuit.