再论双频感应熔炼工艺的关键器件——换频开关

On the Key Device of Dual frequency Induction Melting Technology:Frequency Changeover

介绍用同一台开关向同一感应器输入两种不同频率电流的同时，实现在不同频率下感应器接法的改变并实现在阻抗匹配的前提下经济运行的换频开关结构设计。

In this paper,the authors introduce a frequcency changeover which can input two currents of different frequency into the same inductor with the connection of the inductor changed for different frequency,and can operate economically under the condition of the matched impedance.