DRIVER CIRCUITRY FOR AN ELECTRONIC CONTROL UNIT FOR IRRIGATION SYSTEMS, ADAPTED TO CONTROL AC SOLENOID ELECTROVALVES AND DC BISTABLE SOLENOID ELECTROVALVES

摘要

An electronic control unit for irrigation systems, adapted to control AC solenoid electrovalves and DC bistable solenoid electrovalves, includes a driver circuitry for the solenoid which consists of a first circuit (CT1) for the power supply of an AC solenoid (L) and a second circuit (CT2) for the reversible polarity power supply of a DC bistable solenoid (L). An AC voltage is applied to an input terminal (1) of the first circuit (CT1), whereas a DC voltage is applied to an input terminal (2) of the second circuit (CT2). A common terminal of the solenoid (L) is connected to the output terminal of one or the other circuit depending on whether the solenoid itself is of the AC or DC type. The other terminal of the solenoid is grounded by means of a control device (T), specifically a triac (T), in turn controlled by a microprocessor (M).