原理：晶闸管中频感应加热电源是利用晶闸管将三相工频交流电能变换成几百或几千赫兹的单相交流电能。中频电源的工作原理为：采用三相桥式全控整流电路将交流电整流为直流电，经电抗器平波后，成为一个恒定的直流电流源，再经单相逆变桥，把直流电流逆变成一定频率（一般为1000至8000Hz）的单相中频电流。负载由感应线圈和补偿电容器组成，连接成并联谐振电路。 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：广泛用于铸钢、不锈钢或合金钢的冶炼、真空冶炼、锻件的加热和钢管的弯曲、挤压成型、工件的预热、钢件表面淬火、退火热处理、金属零件的焊接、粉末冶金、输送高温工质的管道加热、晶体的生长等不同场合。在我厂，中频电源适用于钢铁、铜、铝、锌、镍、金银等金材料的熔炼和锻压、热轧、弯管成型前的透热处理。主要用于铸造熔炼行业；具有控制方便、效率高、运行可靠、劳动强度低的特点； 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;