The circuit principle, parameters and some problems of primary power supply driven by constant-voltage charging are analyzed, and the similarities and differences between the primary power supply based on capacitor of energy storage and constant-voltage charging are discussed. 对恒压充电实现重频运行初级能源回路的电路设计、工作原理、参数选择、稳压问题进行分析,并比较了与储能电容方式实现重频强流脉冲加速器初级能源的异同。