Patent ID: 7375477

Claim:
A cold-cathode fluorescent lamp (CCFL) driving system comprising: a plurality of CCFL loads, a driving circuit, a controlling circuit, and a feedback circuit; wherein said driving circuit comprises a transformer with a primary winding and a secondary winding; said primary winding coupled to a voltage source; said secondary winding coupled to said plurality of CCFL loads; each of said CCFL loads is coupled with an impedance for balancing said CCFL loads; said CCFL loads are parallel connected before being connected to said feedback circuit; said controlling circuit comprising a first circuit block and a second circuit block coupled to and configured for manipulating said driving circuit, said first circuit block for warming up each of said CCFL loads to be ignited when said CCFL loads are initially powered on, said second circuit block for generating a modulation signal to maintain said CCRL loads to remain at an operationally-on state; and said feedback circuit is coupled to the CCFL loads and the controlling circuit for generating feedback voltage to said controlling circuit; wherein said first circuit block comprises a capacitor and a resistor connected in series; said capacitor is connected to a reference voltage outputted from said second circuit block, said resistor is connected to ground, a voltage (Vo) generated between said capacitor and said resistor (R) is coupled to said second circuit block.