一、绪言三相中频电源的研制是为了适应我单位科研生产上需要一台高稳定度、频率可调电压可调的电源,以满足它对电源的电压和频率稳定度的苛求。同时要满足频率、电压在较大范围內连续可变的灵活性,以满足各种型号马达的供电,并适用于各种动平衡实验及各项频率特性试验。根据这一要求,我们走访了北京、天津、上海近十几个单位,沒有找到该种电源,于是提出了自己研制三相中频电源的任务。在设计过程中,我们也走了一些弯路。研制工作的关键,是设计一个高稳定性的三 I. INTRODUCTION The development of three-phase intermediate frequency power supply is to adapt to the need of a high-stability and adjustable-frequency adjustable power supply of our institute for scientific research and production, so as to meet the requirements of its stability to voltage and frequency of power supply. At the same time to meet the frequency, voltage continuously variable in a large range of flexibility to meet the various types of motor power supply, and for a variety of dynamic balance test and the frequency characteristics of the test. According to this request, we visited nearly a dozen units in Beijing, Tianjin and Shanghai and did not find such power supply. Therefore, we proposed our own task of developing three-phase intermediate frequency power supply. In the design process, we also take some detours. The key to development is to design a high stability of the three