论文部分内容阅读
3.PFC(功率因素校正)电路(见图5,图见上期)15V电压进入ICl的⑧脚后,ICl开始工作,从⑦脚输出脉冲信号,控制Q7、Q8组成的推挽电路的交替截止、导通。当PFC电路的驱动信号是高电平时,Q7导通、Q8截止,Q5和Q6的栅极为高电平,栅、源极两端电位正向偏置,Q5和Q6导通。当PFC电路的驱动信号是低电平时,Q7截止、Q8导通,控制Q5、Q6的栅极为低电平(此时栅、源极两端电位反向偏置),Q5和Q6截止,使L4A不断地进行储能,将整流后的电压提升到380V左右,经电容C13滤波,输出到PWM(脉冲宽度调制)电路。
3. PFC (power factor correction) circuit (see Figure 5, see the previous period) 15V voltage into the ICl ⑧ feet, ICl began to work, from the ⑦ pin pulse signal to control Q7, Q8 composed of push-pull circuit cut-off , Turn on. When the driving signal of the PFC circuit is high, Q7 is turned on, Q8 is turned off, the gates of Q5 and Q6 are high, the potentials of the gate and the source are forward biased, and Q5 and Q6 are conducted. When the driving signal of the PFC circuit is low, Q7 is turned off and Q8 is turned on to control the gates of Q5 and Q6 to be at a low level (at this time, the potentials at the gate and the source are reverse biased) and Q5 and Q6 are turned off L4A continuously energy storage, the rectified voltage to 380V or so, the capacitor C13 filtered, output to the PWM (pulse width modulation) circuit.