Thyristorwechselrichter mit sättigbaren drosseln fü mittelfrequenzanwendungen

The frequency, which can be attained with conventional static inverters, is limited by the turn-off time of the controlled rectifiers. Resonant circuit inverters with controlled rectifiers and saturable reactors in combination make it possible to generate frequencies whose half-wave duration is equal to or less than, the turn-off time of the controlled rectifiers. When using thyristors for this purpose, resonant circuit inverters can be built for frequencies up to about 25 kc. The inverters described in this paper are suited as medium frequency generators for inductive heating purposes. In this case the inductor coil is a component of the resonant circuit. The workpiece is heated up by an effective frequency much higher than the frequency with which the thyristors are fired.