Control device for an electromagnet, with a power supply powered by the holding current of the electromagnet

摘要

The command mechanism feeds a maintenance coil (1) in series with an electronic switch (T4) with a voltage (Va). A maintenance current circuit (8) is connected in series with the coil and electronic switch. The maintenance circuit is connected to an additional electronic switch (T5) and measurement resistance, which is command controlled (9,10) and periodically conducts through the additional electronic switch.