本文针对原 KGPS—100/2.5可控硅中频炉逆变启动问题,提出了将原辅助可控硅内外桥转换启动方法改为预充电放电的方法,并介绍了这种启动方法的原理、触发脉冲的形成电路、自动调频控制、逆变系统的调试及故障分析等。该启动方法具有线路简单、换流容易、不烧硅、逆变成功率高、运行稳定可靠等优点,能较好地满足生产的需要。 In this paper, in view of the original KGPS-100 / 2.5 SCR inverter furnace start-up problem, the proposed method of conversion of the original auxiliary SCR internal and external bridge conversion start-up method to pre-charge and discharge, and introduces the principle of this startup method, trigger Pulse forming circuit, automatic frequency control, inverter system debugging and fault analysis. The starting method has the advantages of simple circuit, easy commutation, no burning of silicon, high success rate of inverter, stable and reliable operation and the like, and can better meet the needs of production.