Lighting circuit for light emitting element and illumination apparatus including same

摘要

A light-emitting-element lighting circuit for dimming a light emitting element having a diode characteristic by a PWM dimming signal is provided. The lighting circuit includes a dimming signal conversion unit configured to generate the PWM dimming signal having a duty ratio corresponding to an emission level specified by an input dimming signal. The lighting circuit further includes a minimum current generating circuit configured to flow a minimum current during an OFF period of the PWM dimming signal generated by the dimming signal conversion unit such that a voltage greater than a threshold voltage designed to allow the light emitting element to emit a light is applied to the light emitting element, and the light emitting element emits a light of a brightness equal to or less than a lowest emission level specified by the dimming signal.