Power drive system of light-emitting diode strings

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 at least two secondary-side windings, the primary-side winding receiving an AC power source, and each secondary-side winding having a dotted terminal and a non-dotted terminal;
• two current-sharing capacitors including a first current-sharing capacitor and a second current-sharing capacitor;
• one terminal of the first current-sharing capacitor connected to the dotted terminal of one secondary-side winding, and one terminal of the second current-sharing capacitor connected to the non-dotted terminal of another secondary-side winding;
• at least one common choke, each common choke connected between one dotted terminal and one non-dotted terminal of two secondary-side windings;
• at least four rectifying units, two rectifying units correspondingly connected to the other terminal of the first current-sharing capacitor and the other terminal of the second current-sharing capacitor, and other rectifying units correspondingly connected to the at least one common choke;
• 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.