Control Laws and Characters of Pulse Train Controlled Buck Converters
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摘要: 研究了开关DC-DC变换器电压型和电流型脉冲序列控制的特点和实现方式,分析和对比了脉冲序列控制Buck变换器的稳态工作特性、控制规律和启动特性.理论分析、仿真和实验结果表明:电压型和电流型脉冲序列控制变换器在负载变化时控制规律基本相同,即负载增大时控制器产生较多的高能量脉冲.当输入电压升高时,电压型和电流型脉冲序列控制器分别产生较多的低能量脉冲和高能量脉冲.与电压型相比,电流型脉冲序列控制变换器具有更平稳的启动特性.Abstract: The merits and implementation of voltage mode pulse train (VMPT) and current mode pulse train (CMPT) control techniques for switching DC-DC converters were analyzed by theoretical analysis,simulation and experiment to compare their steady state characters,control regulation and startup process.The results show that the control regulations of VMPT and CMPT controllers have basically the same control law under the variation in load,i.e.they generate more high-energy pulses when the load increases;under the variation in input,i.e.when the input voltage increases,VMPT and CMPT controllers generate more low-energy and more high-power pulses,respectively;and the startup process of the CMPT converter is smoother compared with that of the VMPT converter.
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Key words:
- pulse train control /
- Buck converter /
- voltage mode /
- current mode /
- control law
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