在大量电子设备的实际应用过程中,往往因为使用单台直流电源的输出参数(如电压、电流、功率)不能满足要求或发生故障,这样就引起整个系统效率低下甚至系统崩溃。所以在实际应用中通常采用多个电源并联运行。并联均流技术是当前电力电子技术发展的重点,大功率开关电源并联均流系统利用多个中、小功率的电源模块并联,通过改变并联模块的数量来满足不同功率的负载,本文介绍基于UC3902的最大电流自动均流法在大功率开关电源中的应用。 In the practical application of a large number of electronic devices, the output parameters (such as voltage, current and power) of a single DC power supply often fail to meet the requirements or fail, which leads to inefficiency of the entire system and even system breakdown. Therefore, in practical applications, multiple power supplies are usually used in parallel operation. Parallel current-sharing technology is the focus of current power electronics technology development. High-power switching power supply parallel current-sharing system uses multiple medium and low power power supply modules in parallel, and by changing the number of parallel modules to meet the different power load, this article describes based on UC3902 The Maximum Current Automatic Current Sharing Method in High Power Switching Power Supply.