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基于电路的输出效果,采用电荷转移原理阐述平衡式Cockcroft-Walton(C-W)倍压电路较为复杂的物理过程,将电路中二极管的非线性导通特性等效为周期性线性导通的数学解析模型,推导了表征其输出特性的纹波电压和带载输出电压的理论输出表达式。采用仿真软件对比了基本式和平衡式C-W电路的输出特性曲线,结果表明平衡式拓扑结构的纹波大小约为基本式拓扑结构的8%。同时建立的多阶平衡式C-W电路纹波电压理论模型计算值略低于电路软件仿真值,带载输出电压的理论模型计算值与仿真值的相对误差低于10%。
Based on the output of the circuit, the more complex physical process of the balanced Cockcroft-Walton (CW) voltage doubling circuit is described by using charge transfer theory. The nonlinear conduction characteristics of the diodes in the circuit are equivalent to the mathematical model of periodic linear conduction , The theoretical output expression of ripple voltage and on-load output voltage characterizing its output characteristics is deduced. The output characteristics of basic and balanced C-W circuits are compared by simulation software. The results show that the ripple size of balanced topology is about 8% of the basic topology. Simultaneously, the theoretical value of ripple voltage of multi-stage balanced C-W circuit is slightly lower than the simulation value of circuit software. The relative error between theoretical value and simulation value of output voltage with load is lower than 10%.