Vaihtosuuntainen virransuuntaaja.

摘要

A reversible converter for feeding a DC load such as a motor from an AC network has a current regulator which is supplied with a signal representing the actual value of the direct current and a desired value. The regulator is connected both to an emitter for delivering control pulses to the rectifier with a control angle which is dependent on the output voltage of the current regulator, and to a device for switching the polarity of the converter depending on the polarity of the desired current value, which causes a retarding of the converter towards inverter operation before shifting of the polarity of the converter, unblocking and advancing towards rectifier operation. A member which senses the voltage over the DC load is connected to the current regulator when the polarity of the inverter is shifted and delivers to it a signal corresponding to a control angle of the control pulses such that the sum of the inner direct voltage of the converter and the voltage over the DC load is slightly less than zero.