CMOS开关电源中的节能控制器的设计与实现  

Design and implementation of energy-saving controller for CMOS switching power supply

作　　者：柏世兵 

机构地区：[1]重庆工程学院,重庆400056

出　　处：《现代电子技术》2016年第22期124-128,共5页Modern Electronics Technique

基　　金：国家自然科学基金:基于人眼固视微动机制的超分辨率红外成像方法与实验研究(61275099)

摘　　要：传统节能控制器调控CMOS开关电源中,通过脉冲频率调制的方法实现开关电源负载情况进行控制,但是该方法无法解决负载电流的大规模波动问题,抗噪性能较低,节能控制效果较差。因此,设计并实现一种基于脉冲宽度调制的低功耗CMOS式开关电源节能控制器,该控制器融合脉冲宽度调制(PWM)和脉冲跨周期调制(PSM)进行负载控制。若反馈电压取值范围波动不大,则采用脉冲宽度调制,运行时钟下降沿并关停峰值电流,输出控制波形;若波动较大,则采用脉冲跨周期调制,避免控制波形的输出,使得功率开关管处于关断状态,降低功率开关管的损耗。实验结果表明,设计的节能控制器控制CMOS开关电源具有较好的输入电压调整率和负载调整率,最高转换效率可达98%,节能控制效果较好。The method of pulse frequency modulation is used to control the load of switching power supply in traditional CMOS switching power supply regulated with energy-saving controller, but it can＇t solve the large fluctuation problem of load current, and has poor anti-noise performance and energy-saving control effect. Therefore, a energy-saving controller of low-power consumption CMOS switching power supply based on pulse width modulation （PWM） was designed and implemented. The con- troller fuses the PWM and pulse skipping modulation （PSM） for load control. If the feedback voltage value range has little fluctu- ation, the PWM is adopted to run the clock falling edge and shut down the peak current to output the control waveform; other- wise, the PSM is adopted to avoid the output of control waveform, let the power switching tube keep the turn-off state to reduce the wastage of the power switching tube. The experimental results show that the designed energy-saving controller in the process of controlling the CMOS switching power supply has good input voltage regulation and load regulation, its highest conversion effi- ciency can reach up to 98%, and its energy-saving control effect is perfect.

关 键 词：CMOS 开关电源 节能控制 脉冲宽度调制 

分 类 号：TN86-34[电子电信—信息与通信工程] TN433