DIMMING LIGHTING CIRCUIT AND LUMINAIRE

摘要

A dimming lighting circuit includes: a rectifier circuit; a phase detection circuit which outputs a dimming signal having a signal level corresponding to a conduction phase angle of an AC voltage; and a DC-DC converter which receives a DC voltage output from the rectifier circuit and supplies a light source with a DC current corresponding to the signal level of the dimming signal output from the phase detection circuit. If the conduction phase angle detected when the dimming lighting circuit receives the AC voltage at power-on is less than or equal to a predetermined angle, the phase detection circuit outputs, as the dimming signal, a substitute signal having a signal level corresponding to a conduction phase angle greater than the conduction phase angle of the AC voltage, for a predetermined time period.

主权项

1. A dimming lighting circuit which receives an AC voltage which is phase-controlled, and supplies a light source with a DC current, the dimming lighting circuit comprising:
a rectifier circuit which rectifies the AC voltage to output a DC voltage; a phase detection circuit winch detects a conduction phase angle of the AC voltage and outputs a dimming signal having a signal level corresponding to the conduction phase angle detected; and a converter which receives the DC voltage output from the rectifier circuit and supplies the light source with a DC current corresponding to a signal level of the dimming signal output from the phase detection circuit, wherein, if the conduction, phase angle detected when the dimming lighting circuit receives the AC voltage at power-on is less than or equal to a predetermined angle, the phase detection circuit outputs, as the dimming signal, a substitute signal having a signal level corresponding to a conduction phase angle greater than the conduction phase angle detected, for a predetermined time period.