LIGHTING DEVICE, HEADLAMP APPARATUS AND VEHICLE USING SAME

摘要

A lighting device includes: a power converting unit; a voltage measuring unit for measuring an output voltage from the power converting unit or a value equivalent to the output voltage; a current measuring unit for measuring an output current from the power converting unit or a value equivalent to the output current; and a control unit for controlling the power converting unit. When one of the output voltage and the output current of the power converting unit is changed by a specific magnitude per unit hour, the control unit determines that a change in a load status has occurred and controls the power converting unit by switching constant current control in which a measurement value of the current measuring unit is kept at a specific current designated value to constant voltage control in which a measurement value of the voltage measuring unit is kept at a specific voltage designated value.