Patent ID: 9131577
Filing Date: 2015-09-08
Classification: H05B

Abstract:
1. A light emitting element drive device, comprising: a light emitting element; a power conversion circuit that supplies electric power to the light emitting element; a dimming switch element that performs an open/close operation for a path in which a current flows in the light emitting element; a current detection circuit that detects a current value of the current flowing in the light emitting element; a voltage detection circuit that detects a voltage value of a voltage that is output from the power conversion circuit; and a control circuit that performs feedback control, wherein when the dimming switch element is turned ON, the control circuit performs feedback control so as to make the current value close to a first target value, and the first target value is a predetermined value, when the dimming switch element is turned OFF, the control circuit performs the feedback control so as to make the voltage value close to a second target value, and the second target value is set based on the voltage value, and the second target value is set based on the voltage value that is detected by the voltage detection circuit while the dimming switch element is turned ON.