One-to-two intermediate frequency furnace is a kind of intermediate frequency furnace. Its structure is that one power supply and two furnaces work at the same time. Insulation, heating, tempering, etc. are carried out at an accurate temperature to maximize production. Good starting characteristics, can start at will under full load and heavy load. Improve the power factor, and the power factor can reach 95% under any power. Constant power output, using constant power output control, during the smelting process, when the load and temperature change, the load is always full power output, which can shorten the smelting time. Therefore, the series inverter of the one-to-two intermediate frequency furnace adopts a half-bridge circuit, and because the number of main circuit components is relatively reduced, and there is a high power factor, it has a higher power.