CIRCUIT FOR DRIVING ONE OR MORE ELECTROMAGNETIC RELAYS WHICH USES MINIMUM POWER AND RESULTS IN MINIMUM TEMPERATURE IN THE RELAYS

摘要

A circuit arrangement for driving at least one electromagnetic relay provides that all of the excitation circuits can be connected to a constant voltage source in parallel relative to each other and jointly in series with the switching path of an electronic switch (FET). The electronic switch (FET) is switched through and blocked in impulsive manner whereby the pulse-duty factor is adjusted in a control unit depending on the operating voltage (UB) and the ambient temperature of the relay so that it does not fall below the minimum holding current required for the connected relays.