Controller for inductive drives

摘要

The invention relates to a controller for inductive drives which operate in the intermittent mode or using two-point regulation, in order to avoid spark interference pulses, which are caused by switching on and off, and starting difficulties in coolant circuits. The aim is for the solution according to the invention to have high efficiency with respect to radio interference in the radio-frequency band, preferably in the very high frequency band, and for highly-sensitive recording and replay equipment in the audio-frequency band. The features of the invention comprise the creation of an upstream controller. A connection to the mains is produced only when the mains voltage is zero. This means that the sinusoidal half-cycle is passing through the zero region at the moment of switching on. <IMAGE>