Solenoid driver system

Details Solenoid driver system Solenoid driver system

1988-10-04

1989-12-26

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361153, 361194, 361203, 361 93, 340664, 307 82, H01H 4722, H01H 4732

Patent

active

048901881

ABSTRACT:
A solenoid driver system drives a solenoid, such as a solenoid in a glue applicator or any like apparatus incorporating a solenoid, and which requires control of the solenoid in response to a signal voltage. The solenoid driver system generates a turn on signal that enables the solenoid, such as that of a glue gun applicator, to energize quickly because of a rapid rise solenoid signal. A solenoid driver stage of two switching transistors and two high voltage fast recovery diodes are connected to a control pulse through a high side optical isolator and a high side buffer, and a low side optical isolator and a low side buffer. The low side circuit includes a trigger circuit and a delay circuit connected to a gate along with a free-running oscillator for periodically energizing the low side drive of the circuit in a mode as long as the input signal is energized. This ensures that the amount of current dissipated in the solenoid coil is small. A current sensing fault logic and shut down logic are provided to prevent damage to the solenoid driver system circuitry or the solenoid coil.

REFERENCES:
patent: 3864608 (1975-02-01), Normile et al.
patent: 4173030 (1979-10-01), Rabe
patent: 4438478 (1984-03-01), Matsuyama
patent: 4470095 (1984-09-01), Donig
patent: 4630165 (1986-12-01), D'Onofrio

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