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在西欧各国,由于电子技术发展较快,五十年代时已开始使用中频感应加热以代替古老落后的地炉灌砂弯管工艺。当时所采用的中频电能系由中频发电机组所产生,而中频发电机组不仅造价昂贵,占地面积大,而且维护保养不便,所以一直未能普遍被应用。在五十年代末期可控硅元件诞生之后,于1966年西欧及世界各国相继制造出利用可控硅元件组成的一种新型中频电源——“可控硅逆变器”,这是一种能够把三相50周波的工频交流电能转换成单
In Western Europe, due to the rapid development of electronic technology, the mid-1950s have begun to use medium-frequency induction heating to replace the ancient and backward furnace sand filling pipe bending process. The intermediate frequency power used at that time was generated by the intermediate frequency generator set. However, the medium frequency generator set has not been widely used because of its high cost, large area and inconvenient maintenance. In the late fifties after the birth of SCR components, in 1966 in Western Europe and the rest of the world have been manufactured using SCR components of a new type of intermediate frequency power - “SCR inverter” The three-phase 50-cycle AC power can be converted into single