LIGHTING DEVICE AND ILLUMINATION APPARATUS

• Main Authors: HARADA KAZUHIKO, WADA MANABU, NAKASHIRO AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

To reduce stress applied to an element constituting a circuit, in a lighting device that turns on a light-emitting element by receiving power supply from a phase control type dimmer.SOLUTION: A lighting device includes: a power conversion circuit 1b receiving power supply from a phase control type dimmer and supplying power to a light-emitting element; a constant current circuit 91 flowing constant current through the light-emitting element; and a voltage feedback circuit 1m to output, to the power conversion circuit, a control signal for controlling the output voltage of the power conversion circuit to a predetermined target value. The feedback circuit 1m includes an RC filter circuit 1n provided between the constant current circuit 91 and the power conversion circuit 1b, the RC filter circuit having a cutoff frequency fc in the range of 10 Hz<fc<50 Hz. An applied voltage Vq to the constant current circuit 91 is set such that a ripple component of supply power from the dimmer is not generated in an applied voltage Vf to the light emitting element.SELECTED DRAWING: Figure 5 【課題】位相制御式の調光器から電力供給を受けて、発光素子を点灯させる点灯装置において、回路を構成する素子に与えるストレスを低減できるようにする。【解決手段】位相制御式の調光器から電力供給を受けて、電力を発光素子に供給する電力変換回路１ｂと、定電流を発光素子に流す定電流回路９１と、電力変換回路の出力電圧を所定目標値に制御するための制御信号を電力変換回路に出力する電圧フィードバック回路１ｍとを設ける。フィードバック回路１ｍは、定電流回路９１と電力変換回路１ｂとの間に設けられたカットオフ周波数ｆｃが１０Ｈｚ＜ｆｃ＜５０Ｈｚの範囲であるＲＣフィルタ回路１ｎを有し、発光素子の印加電圧Ｖｆに、調光器からの供給電力のリプル成分が発生しないように定電流回路９１の印加電圧Ｖｑを設定する。【選択図】図５