【摘要】 提出了基于UC3842的Boost(升压)电路控制策略,运用开关函数法建立了Boost功率电路的高频数学模型,进而给出了状态空间平均模型,基于这一模型,从控制理论的角度分析了Boost电路的能控、能观测性。文中给出了占空比的输入到输出的小信号传递函数,为设计校正补偿网络提供了理论依据。这一电路可应用于中小型UPS(不间断电源)中,给蓄电池升压,为UPS中的逆变器提供输入电压,可以满足掉电时UPS的动态性能。最后给出的仿真和实验结果,证明了文中分析的正确性和UC3842控制的实用性。更多还原

【Abstract】 This paper proposes the control strategy based on UC3842 applied to Boost topology.High frequency mathematic model is derived from virtue of switching function and the space state average model of main circuit is presented.Based on this model,the control to output transfer function is deduced in detail,which helpful to design compensated net of regulator to get constant voltage and achieved fast dynamic response.It is important to UPS when the grid lost electric.Finally,the simulation and experimental waveforms are given to verify the analysis in the end of the paper.更多还原