CAJ | 학술논문

本文提出一种用于DC/DC转换器的高效PWM控制电路。该控制电路采用电流控制模式,在宽范围内有着良好的瞬态响应。斜坡补偿信号与误差放大器的输出信号进行叠加,叠加后的信号与电流采样信号进行比较,产生一个占空比信号控制功率管的通断。并且本PWM控制电路中的误差放大器与软启动结合在一起,实现输出电压平滑稳定上升,有效减少了输入电流和输出电压过冲现象,保护了系统安全。
본문제출일충용우DC/DC전환기적고효PWM공제전로。해공제전로채용전류공제모식,재관범위내유착량호적순태향응。사파보상신호여오차방대기적수출신호진행첩가,첩가후적신호여전류채양신호진행비교,산생일개점공비신호공제공솔관적통단。병차본PWM공제전로중적오차방대기여연계동결합재일기,실현수출전압평활은정상승,유효감소료수입전류화수출전압과충현상,보호료계통안전。
A High-efficient PWM control circuit which is applied to DC/DC converter is presented in this paper. Based on current-mode control, good transient response has been realized in wide range. Superimposed signal of slope compensation and error amplifier output is compared with the signal of current sense, then produce a duty cycle to control the power transistor off. Meanwhile, This PWM control circuit combine error amplifier with soft-start, which realize the voltage of output smooth and steady increase. It is effective to reduce input current and output voltage overshoot, and protect the system security.