Energising circuit for electromagnetic coil of combustion engine flow valve solenoid

摘要

The circuit consists of a power switch (2) coupled to a voltage source, in series with the electromagnetic coil (1), and a control appts. connecting line, leading to the power switch between the line terminal (5) and the control appts. connecting line (4) is incorporated an overvoltage circuit (7). The line terminal lies between the power switch and the electromagnetic coil, while the overvoltage circuit makes the power switch, on appearance of a preset voltage level, by self-induction in the electromagnetic coil, and pref. consists of a series-connection of a blocking diode (7.1) and a Zener diode (7.2).