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: the thyristor medium frequency induction heating power supply is to use the thyristor to convert the energy of the three-phase frequency conversion to several hundred or thousands of Hertz single phase alternating current energy. The working principle of intermediate frequency power supply for: the three-phase bridge type all control the ac rectifier for dc rectifier circuit, after the flat wave reactor, became a constant dc current source, then through single phase inverter bridge, the dc current inverter with a certain frequency (generally between 1000 and 8000 hz) of single-phase medium frequency current. The load consists of inductive coils and compensation capacitors connected to parallel resonant circuits. 　　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； USES: widely used in cast steel, stainless steel or alloy steel smelting and vacuum smelting and forging heating and steel tube bending, extrusion molding, workpiece preheating, steel surface hardening, annealing heat treatment, welding, powder metallurgy, metal parts of the pipeline conveying high temperature heating, different occasions, such as crystal growth. In our factory, the intermediate frequency power supply is applicable to the heat treatment of steel, copper, aluminum, zinc, nickel, gold and silver, and other gold materials, such as smelting and forging, hot rolling, and bending tube. Mainly used in foundry smelting industry; It has the characteristics of easy control, high efficiency, reliable operation and low labor intensity;