摘要
传统平均电流模升降压DC-DC变换器在两升降斜坡电压出现交叠和分离时,电流控制环路误差比较器输出电压与斜坡电压无法正确比较,导致环路调制错误和阻塞问题。提出了一种斜坡电压发生电路,其采用环路调制信号反馈调节斜坡充放电电流,实现两斜坡峰值电压自适应调整,优化了Buck-Boost DC-DC变换器反馈环路停滞和四开关同时调制的问题,减少功率管的开关损耗和导通损耗,有效提高变换器转换效率。基于0.18μm BCD工艺设计,仿真结果表明,变换器在2.5~5 V输入电压范围,不同PVT变化情况下实现了BUCK/BOOST模式无缝切换,带载能力可达3 A,最高峰值效率为97.46%。
In conventional average current mode buck-boost DC-DC converters,when the two ramp voltages for boosting and bucking become interleaved or separated,the output signal of the inner current-loop compensator cannot be effectively compared with the ramp signal.This presents modulation errors and blockage issues within the loop.In this study,we proposed a circuit for generating ramp voltages,which utilizes the feedback of the control loop signal to regulate the charging and discharging currents of the ramps.This approach enables the adaptive adjustment of the peak voltages of the two ramps,thereby effectively optimizing the problems of feedback loop stagnation and simultaneous modulation of the four switches in the buck-boost DC-DC converter.The proposed approach reduces the switching and conduction losses of the power transistors,thereby significantly improving the efficiency of the converter.The simulation results demonstrate that the converter,which is designed based on 0.18μm BCD process,achieves seamless switching of buck/boost modes under different process,voltage,and temperature(PVT)variations in the input voltage range of 2.5 to 5 V,with a load carrying capacity of up to 3 A and the highest peak efficiency of 97.46%.
作者
许仕海
蒋丽
韦雪明
徐卫林
韦保林
韦家锐
刘程斌
XU Shihai;JIANG Li;WEI Xueming;XU Weilin;WEI Baolin;WEI Jiarui;LIU Chengbin(Guangxi Key Lab.of Wireless Wideband Communication and Signal Processing,Guilin,Guangxi 541004,P.R.China;Goke Microelectronics Co.,Ltd,Changsha 410131,P.R.China)
出处
《微电子学》
北大核心
2025年第2期229-234,共6页
Microelectronics
基金
国家自然科学基金资助项目(62164003,62364009)
广西自然科学基金项目(2024GXNSFAA010487)
广西无线宽带通信与信号处理重点实验室主任基金项目(GXKL06230106,GXKL06200131)。
