Lighting device of semiconductor light-emitting element and illumination fixture using the same

摘要

[Object] To light and dim a semiconductor light emitting element with high accuracy in a simple configuration. [Means for Settlement] A lighting device of a semiconductor light emitting element including: a switching element connected in series to a direct-current power source and controlled to be turned on and off at a high-frequency wave; an inductance component which is connected in series to the switching element and to which an electric current flows from the direct-current power source at on-time of the switching element; a regeneration diode for emitting energy accumulated in the inductance component at the on-time of the switching element to the semiconductor light emitting element at off-time of the switching element; current detection means adapted to detect an electric current flowing to the switching element; and control means adapted to turn off the switching element when a current value detected by the current detection means reaches a predetermined value and to turn on the switching element when the emission of energy of the inductance component is completed, wherein the control means dims the semiconductor light emitting element by intermittently blocking at a low frequency an operation to detect the completion of the energy emission of the inductance component.