针对感应钎焊过程中谐振频率不断变化的问题,在常规以SG3525A为控制核心的逆变电源基础上,设计了一套基于PI调节的谐振频率自动跟踪技术。该技术充分利用了SG3525A芯片的功能,具有跟随速度快、频率跟踪准确、电路设计简单、工作可靠等优点,同时简化了串联谐振电源的起动方法。并对该技术的工作原理、电路设计以及实验结果等作了详细的分析和介绍。 Aiming at the problem that the resonant frequency changes constantly in induction brazing process, a set of resonant frequency automatic tracking technology based on PI regulation is designed based on the conventional inverter with SG3525A as the control core. The technology takes full advantage of the SG3525A chip features, with fast follow-up, accurate frequency tracking, circuit design is simple, reliable work, etc., while simplifying the start-up method of series resonant power supply. And the working principle of the technology, circuit design and experimental results made a detailed analysis and introduction.