Patent ID: 8665922
Filing Date: 2014-03-04
Classification: H01S,H05B,Y02B

Abstract:
1. A driver circuit of a light-emitting element, comprising: a series-connected unit having a light-emitting element and a current limiting inductor directly connected to the light-emitting element; a regenerative unit which is connected in parallel to the series-connected unit and which regenerates energy stored in the current limiting inductor; a switching element which controls a current flowing through the light-emitting element and the current limiting inductor; a controller which controls an operation of the switching element according to a voltage change of a power supply applied to the light-emitting element; and a timing inductor which is electromagnetically coupled to the current limiting inductor and which outputs a control signal to the controller, wherein the controller controls a timing of switching of the switching element according to the control signal, and the switching element is switched from an OFF state to an ON state at a time when an inter-terminal voltage of the switching element becomes a minimum, according to the control signal.