Power directly affect the performance of various types of electronic equipment,so we designed one excellent performance switching mode power supply.Taking UC3844 as the core of the design of the power supply control,the DC/DC converter main circuit uses a single-ended flyback circuit.Supply voltage feedback section using typical optocoupler PC8 1 7 and TL43 1 ,the paper gave a detailed analysis.The experimental results show that the circuit has high efficiency, stability of output,superior performance and relatively low cost.%电源的优劣直接影响到各类电子设备的性能，文中设计了一款性能优良的开关电源。该电源控制电路以UC3844为核心进行设计；DC/DC变换主电路采用单端反激式电路；电源电压反馈部分采用典型的TL431加光耦PC817。实验结果表明该电路效率高，输出稳定，性能优越，成本相对较低。
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