Patent ID: 9084327
Filing Date: 2015-07-14
Classification: G05F,H02M,H05B,Y02B

Abstract:
1. A driver circuit for driving a LED array, the LED array comprising: a first LED device, a second LED device, a third LED device, a fourth LED device, and a first diode device, wherein the second LED device is connected to the first LED device, the fourth LED device is connected to the third LED device, and the first diode device is connected between the second LED device and the third LED device, the driver circuit comprising: a first constant current regulator for coupling between the first LED device and the second LED device; a second constant current regulator for coupling between the second LED device and the third LED device; a third constant current regulator for coupling between the third LED device and the fourth LED device; a fourth constant current regulator for coupling between the fourth LED device and a fixed-voltage terminal; and a control circuit coupled with the first, the second, the third, and the fourth constant current regulators; wherein when an input voltage of a target constant current regulator of the first, the second, the third, and the fourth constant current regulators exceeds a corresponding threshold voltage, the target constant current regulator reduces a current flowing through the target constant current regulator to be lower than a predetermined threshold value under control of the control circuit.