Mono-stable control for bi-stable relay, has condensers charged through resistances by input voltage, where relay is returned to OFF state by slowly reducing voltage such that one condensers voltage attains preset threshold

摘要

The control has condensers (Con, Coff) charged through resistances (Ron, Roff) by an input voltage (Vin). A bi-stable relay is switched to ON state by control logic, when a voltage (Vcoff) is higher than a threshold. The relay is returned to OFF state by slowly reducing the voltage (Vin) such that the voltage (Vcoff) attains another threshold by auto-discharge.