Patent ID: 7466567

Claim:
A half-bridge CCFL driving apparatus, used for driving at least one CCFL, comprising: a bridge rectifier converting AC into a DC voltage; a capacitor unit connected with the bridge rectifier and storing the DC voltage, and averaging the DC voltage into two equal voltage to output; at least one transformer having a primary winding and a secondary winding, wherein the primary winding of the transformer is connected with the capacitor unit via a half-bridge switch; at least one resonant capacitor individually connected with the secondary winding of the transformer and the CCFLs; and a PWM controller connected with the resonant capacitors, the CCFLs, and the half-bridge switch to obtain the feedback values of the operation current and the operation voltage of the CCFLs, wherein the PWM controller drives the half-bridge switch via an isolated driving element according the feedback values; wherein the PWM controller driving the half-bridge switch via the isolated driving element by turns means to transmit the two equal voltages outputted from the capacitor unit to the primary winding of the transformer by turns, and the serial leakage inductance produced at the secondary winding of the transformer works with the resonant capacitors to generate a continuous sine-wave voltage that is supplied to the CCFL.