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在中国散裂中子源中,快循环同步加速器射频系统要求偏流源电源的输出带宽大于10 kHz,而开关电源样机的输出带宽最大输出只有3 kHz,无法满足带宽设计要求。因此在偏流源开关电源正式工程机中,加入了线性调整支路,以提高整个系统的输出带宽。开关电源中加入线性调整支路的方法有多种,本文介绍了开关电源并联线性调整支路方法的选取原则,分析了不同方法的优缺点,并对加入线性调整支路前后开关电源的带宽测试结果进行了对比。测试结果表明,线性调整支路可以弥补开关电源带宽的不足,加并联线性支路后的开关电源输出带宽大于10 kHz。
In China’s spallation neutron source, the fast cycling synchrotron RF system requires that the output bandwidth of the bias current source be greater than 10 kHz, while the maximum output bandwidth of the prototype of the switching power supply is only 3 kHz, which can not meet the bandwidth design requirements. Therefore, in the official project of the bias current source switching power supply, a linear adjustment branch is added to improve the output bandwidth of the entire system. There are many ways to add a linear adjustment branch in the switching power supply. This paper introduces the selection principle of the parallel adjustment branch of the switching power supply, analyzes the advantages and disadvantages of different methods, and tests the bandwidth of the switching power supply before and after adding the linear adjustment branch The results are compared. The test results show that the linear adjustment branch can make up for the shortage of the switching power supply bandwidth. The output bandwidth of the switching power supply with parallel linear branch is larger than 10 kHz.