适用于宽输入电压范围的Buck转换器设计和优化  

Design and Optimization of Buck Converter Applicable for Wide Input Voltage Range

作　　者：余正军[1] YU Zhengjun(Shantou Polytechnic,Shantou 515078,China)

机构地区：[1]汕头职业技术学院,广东汕头515078

出　　处：《电工技术》2024年第20期144-148,152,共6页Electric Engineering

基　　金：汕头市社科规划项目(编号ST23YB24);汕头职业技术学院横向课题项目(编号SZ2022-KY-019,SZ2022-KY-024)。

摘　　要：设计了一种基于0.18μm DTI高压BCD工艺的Buck转换器,其适用于输入电压8~36 V、输出电压6~7 V、负载电流50 mA~2 A、温度范围-40~150℃的应用场景。采用并联有源器件实现低损耗,并采用高压浮地技术的比较器进行电压比较。利用自举技术实现高电压源,通过高压Level shift电路驱动功率管的PWM控制信号,并采用预驱动和后驱动控制减小电流损耗。采用轻负载跳周期工作模式降低开关导通损耗,过压、欠压检查电路提高可靠性,并通过逐周期自检测技术解决故障。仿真结果表明,当输入电压14 V、输出电压6.5 V时,该电路在负载电流0.2~2 A范围内的转换效率均在90%以上,最大达93.18%。The present work designed a 0.18μm DTI high-voltage BCD process-based Buck converter which is applicable to scenarios with input voltage of 8~36 V,output voltage of 6~7 V,load current of 50 mA~2 A,and temperature range of-40~150℃.The design uses parallel active devices to achieve low losses,and a comparator with high-voltage floating ground technology for voltage comparison.It adopts bootstrap technology to achieve a high voltage source which can drive the PWM control signal of the power transistor through a high voltage Level shift circuit,and employs pre-driven and post-driven control to reduce current loss.A light load skip cycle working mode and over/under-voltage check circuits were also utilized to reduce switch conduction loss and improve reliability.In addition,the converter is designed to realize automated fault handling through cycle-by-cycle self detective circuits.The simulation results show that when the input voltage is 14 V and the output voltage is 6.5 V,and the load current is between 0.2~2 A,the conversion efficiency of the circuit remains above 90%with a peak value of 93.18%.

关 键 词：宽输入范围 Buck转换器 高压浮地技术 PWM调制 

分 类 号：TM433[电气工程—电器]