Arrangement for the power supply of relays

摘要

The subject-matter of the invention is an arrangement for the power supply of relay coils (8, 9) which can optionally be switched in parallel by means of a programmable controller. The relay coils (8, 9) are designed for low voltage. The arrangement contains a mains transformer (3) and a rectifier (4). The coils (8, 9) of the relays (1, 2) are supplied with a voltage which is compared (via a circuit (14) which forms the mean value of the voltage) as the actual value of the relay variable with a desired value which is proportional to the rated voltage of the relays (1, 2). A signal corresponding to the control deviation is passed to a switch (6) which is arranged between the rectifier (4) and the coils (8, 9). <IMAGE>