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| 摘要: |
| 在建立全桥移相PWMDC/DC变换器小信号模型的基础上对稳流型开关电源的控制系统进行了研究,给出了稳流型开关电源的闭环控制系统的电路组成和数学模型。引入新型PWM电源控制器UCC3895对中大功率全桥移相软开关方式稳流型开关电源控制电路进行了具体设计。稳流电源控制器由主控芯片UCC3895及其外围的时钟与锯齿波形成、自适应死区设置、隔离驱动、保护、电压电流采样和调节器等子模块组成。用Matlab对控制参数进行了整定,采用PSpice电子仿真软件对系统进行仿真,结果表明根据系统小信号模型设计的开关稳流电源是可行的。 |
| 关键词: 稳流,开关电源,控制系统,UCC3895,PSpice仿真 |
| DOI： |
| 分类号:TM44 |
| 基金项目: |
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| Stable current control of switching power supply |
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CAI Zi-liang FANG Bo
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| Abstract: |
| Based on the small-signal model of full-bridge phase-shifted PWM DC /DC converter,the stable current control system of switching power supply is developed,with the mathematic model and circuit of its closed-loop control system presented.The control circuit of high /middle power is designed with UCC3895,PWM power supply controller,and sub-modules:clock and saw-tooth wave generator,adaptive dead band,insulated driver,protection,voltage /current sampler,regulator,etc..The control parameters are set by Matlab software and the system is simulated with PSpice,results show the design is feasible. |
| Key words: stable current,switching power supply,control system,UCC3895,PSpice simulation |
