Aiming at the condition of high voltage input in the PV system, This paper proposed an improved circuit, which adopts two flyback circuit in series to solve the single tube pressure problem, and then to solve the problem of high cost, low frequency, low power and so on. First, the main circuit and calculation of the main parameters are provided, it provides a main output of 24 V, control circuit uses current type chip PWM UC2844. And then, the experiment shows the waveforms. The results show that it can solve those problems mentioned above efficiently.%针对光伏系统中高压输入的情况，提出一种改进型的电路，即采用2个反激电路串联来解决单管耐压问题，进而解决系统成本高、频率低、功率密度低等问题。首先，给出了主电路和主要参数计算，设计了一款主输出24 V的串联反激电路，控制部分采用电流型脉宽调制芯片UC2844。然后通过实验测出了开关管电压波形和输出电压波形。实验结果表明，该电路能很好地解决单管耐压和低频等问题。
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