原理：晶閘管中頻感應加熱電源是利用晶閘管將三相工頻交流電能變換成幾百或幾千赫茲的單相交流電能。中頻電源的工作原理為：采用三相橋式全控整流電路將交流電整流為直流電，經電抗器平波后，成為一個恒定的直流電流源，再經單相逆變橋，把直流電流逆變成一定頻率（一般為1000至8000Hz）的單相中頻電流。負載由感應線圈和補償電容器組成，連接成并聯諧振電路。 Principle: Thyristor Medium frequency induction heating power is the use of thyristor three-phase three-phase AC power can be converted into several hundred or several thousand Hertz single-phase AC power. The working principle of medium frequency power supply is used for three-phase full bridge controlled rectifier circuit for rectifying the alternating current direct current, the flat wave reactor, a direct current source is a constant, then the single-phase inverter bridge, the inverter DC current into a certain frequency (typically 1000 to 8000Hz) of the single-phase medium frequency current. The load is composed of an induction coil and a compensating capacitor, and is connected into a parallel resonant circuit. 用途：廣泛用于鑄鋼、不銹鋼或合金鋼的冶煉、真空冶煉、鍛件的加熱和鋼管的彎曲、擠壓成型、工件的預熱、鋼件表面淬火、退火熱處理、金屬零件的焊接、粉末冶金、輸送高溫工質的管道加熱、晶體的生長等不同場合。在我廠，中頻電源適用于鋼鐵、銅、鋁、鋅、鎳、金銀等金材料的熔煉和鍛壓、熱軋、彎管成型前的透熱處理。主要用于鑄造熔煉行業；具有控制方便、效率高、運行可靠、勞動強度低的特點； Application: widely used in steel, stainless steel or alloy steel smelting, vacuum smelting, forging and heating pipe bending, extrusion molding, preheating of workpiece, the surface of steel quenching, annealing, metal parts welding, powder metallurgy, conveying high temperature refrigerant pipe heating, crystal growth on different occasions. In our factory, heating treatment of intermediate frequency power supply for steel, copper, aluminum, zinc, nickel, gold and silver and other metal materials smelting and forging, hot rolling, bending and molding before. Mainly used in foundry and smelting industry. It has the characteristics of convenient control, high efficiency, reliable operation and low labor intensity;