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(2)全桥驱动电路全桥驱动电路用于产生符合要求的交流高压,驱动CCFL(冷阴极荧光灯)工作。该机的全桥驱动电路由Q4、Q5、T1、T2等组成。Q4、Q5为复合型开关管,内含两个开关管,由U1内部振荡电路产生的振荡脉冲,使Q4、Q5内部的开关管交替导通与截止,并从⑤～⑧脚输出脉冲信号,加到升压变压器T1、T2的“一次”绕组,经T1、T2变换后,在T1、T2变压器的“二次”绕组输出高压。从变压器T1“二次”侧输出的高压经L1耦合输
(2) full-bridge driver circuit Full-bridge driver circuit used to produce the required AC high voltage, driving CCFL (cold cathode fluorescent lamp) work. The machine’s full-bridge driver circuit by the Q4, Q5, T1, T2 and other components. Q4, Q5 for the composite switch, contains two switches, the oscillation pulse generated by the U1 internal oscillator circuit, Q4, Q5 turn on and off the internal switch alternately, and from ⑤ ~ ⑧ pin output pulse signal, Is added to the “one” winding of the step-up transformers T1 and T2, and after T1 and T2 are transformed, high voltage is output on the “secondary winding of the T1 and T2 transformers. High voltage output from transformer T1 ”secondary " side is coupled via L1