Patent ID: 8487550
Filing Date: 2013-07-16
Classification: H05B

Abstract:
1. A multi-channel light-emitting diode driver circuit for driving a plurality of light-emitting diode arrays, comprising: a transformer having a primary winding and a secondary winding; a main switch circuit connected to the primary winding for allowing an input voltage to be transmitted to the secondary winding and generating a secondary voltage across the secondary winding by switching operations of the main switch circuit; a plurality of regulating circuits connected to the secondary winding and the light-emitting diode arrays for receiving the secondary voltage and providing a plurality of output currents to the light-emitting diode arrays to generate a plurality of error signals; a determining circuit connected to the regulating circuits for receiving the error signals individually indicative of a power through rate of a regulating circuit and generating a feedback signal according to the power through rate indicated by the error signals; and a main control unit connected to a control terminal of the main switch circuit and the determining circuit for generating a switching control signal to control the switching operations of the main switch circuit.