Patent ID: 8941317
Filing Date: 2015-01-27
Classification: H05B,Y02B

Abstract:
1. A power drive system of light-emitting diode (LED) strings for driving a plurality of LED strings, the power drive system comprising: an isolation transformer having a primary-side winding and a secondary-side winding, the primary-side winding receiving an AC power source, and the secondary-side winding having a dotted terminal and a non-dotted terminal; a current-sharing capacitor, one terminal of the current-sharing capacitor connected to the dotted terminal of the secondary-side winding; two rectifying units, one rectifying unit connected to the other terminal of the current-sharing capacitor and the other rectifying unit connected to the non-dotted terminal of the secondary-side winding; each rectifying unit correspondingly connected to a LED string; and a current control integrated circuit (IC), connected between common points of the rectifying units and corresponding anode terminals of the LED strings and corresponding cathode terminals of the LED strings, and configured to simultaneously drive the LED strings and control total current flowing through the LED strings.