Plunger solenoid driving circuit

Abstract

Abstract PURPOSE: To provide an accurate driving operation with a plunger by a closed circyit loop consisting of charge/discharge circuit and conductive circuit and having a circuit configuration to emit a positive feedback signal which drastically accerelates output variation. CONSTITUTION: A closed circuit consists of a capacitor C 5 , a resistor R 17 , a transistor TRQ 9 , a resistor R 15 , and a transistor TRQ 8 . In this closed circuit, when charging current to the capacitor C 5 starts decreasing, the base voltage of the TRQ 9 start to decrease, permitting the TRQ 8 to increase its base voltage. Thus, the charging current to the cpacitor C 5 via the TRQ 8 further decreases. This positive feedback action causes the TRQ 8 to be instantaneously converted from a conductive to nonconductive state. Due to this positive feedback, the voltage applied to the plunger solenoid PL 2 rapidly falls from the starting voltage +V 1 to the maintenance voltage +V 2 , thus permitting the plunger to perform an accurate driving operation. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Ryuichi Nanjo

Bibliographic Details