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本文指出按经典光伏理论给出的光电池等效电路存在的问题，给出改进的光电池的等效电路。在此基础上推出光电池的频率特性，为合理地设计光电检测系统提供了理论根据。
This paper points out the problems existing in the photovoltaic equivalent circuit given by the classical photovoltaic theory and presents an improved equivalent circuit of the photovoltaic cell. Based on this, the frequency characteristics of photovoltaic cells are introduced, which provides a theoretical basis for the rational design of photoelectric detection system.