LIGHTING DEVICE AND ILLUMINATION APPARATUS HAVING THE SAME

PROBLEM TO BE SOLVED: To make it possible to reduce temperature rise of a solid-state light-emitting element at an occurrence of abnormality.SOLUTION: A lighting circuit 11 supplies a current to a light source 20. A protection circuit 12 is connected in series with the light source 20. The protection circuit 12, when a current having a current value equal to or larger than a threshold value flows, cuts off the current. When the current value of the current flowing through the protection circuit 12 is equal to or higher than the threshold value, A bypass circuit 13 causes a current to flow from the lighting circuit 11 to the protection circuit 12 by bypassing the light source 20.SELECTED DRAWING: Figure 1 【課題】異常発生時の固体発光素子の温度上昇を低減できる。【解決手段】点灯回路１１は光源２０に電流を供給する。保護回路１２は光源２０と直列に接続されている。保護回路１２は、閾値以上の電流値の電流が流れたときに、電流を遮断する。バイパス回路１３は、保護回路１２に流れる電流の電流値が閾値以上であるときに、点灯回路１１から光源２０を迂回して保護回路１２に電流を流す。【選択図】図１