ELECTRONIC CONTROL DEVICE WITH AUTOMATIC PROTECTION AGAINST THE CONDITION OF EXHAUSTED BATTERY FOR BISTABLE TYPE SOLENOID VALVE, PARTICULARY FOR WATERING SYSTEMS

摘要

An electronic control device for a bistable solenoid valve, comprising: a power supply battery (B); a capacitor in parallel with the battery; a switch having first switching means (P1) interposed between the battery and the capacitor and second switching means (P2, P3) interposed between the capacitor and the bistable solenoid (X4), said switch having a first operating position (rest position), in which the capacitor is connected to the battery to receive charge therefrom and is disconnected from the solenoid valve and second and third operating positions in which the capacitor is disconnected from said battery and is connected to the solenoid valve to transfer control voltages having opposite signs from the capacitor to the solenoid valve for respectively causing closing and opening of the soleniod valve; and a programmed logic control unit (M) which controls said switch so that at each request for the opening of the solenoid valve the switch operates, in succession, first switching from said first operating position to said second operating position for the closing of the solenoid valve after a first preset time has elapsed from a previous valve closing operation, then swtiching to said first operating position and finally switching to said third operating position for the opening of the solenoid valve after a second preset time from said second switching, said second preset time being shorter than said first preset time. 2242 ה' בחשון התשס" ד - October 31, 2003