Browse Prior Art Database

Solenoid Driver Circuit

IP.com Disclosure Number: IPCOM000090339D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Johnson, TG: AUTHOR

Abstract

The solenoid driver circuit is for decreasing the switching time of solenoid 10. The conventional driver circuit at the left employs capacitor C1 connected by line 11 to transistor driver 12 to decrease the pickup time of the solenoid. The conventional circuit is changed as shown at the right to decrease the dropout time of the solenoid. Diode D1 connects C1 as before when the solenoid is being picked up, but blocks that path when the solenoid is dropped. Instead, resistor R3 is inserted in the path, operating transistor 13. A portion of the current from C1 is directed by diode D2 to resistor R4 to discharge the capacitor. The remainder of the current is supplied through resistor R5 as reverse current to the solenoid, speeding its release.

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Solenoid Driver Circuit

The solenoid driver circuit is for decreasing the switching time of solenoid 10. The conventional driver circuit at the left employs capacitor C1 connected by line 11 to transistor driver 12 to decrease the pickup time of the solenoid. The conventional circuit is changed as shown at the right to decrease the dropout time of the solenoid. Diode D1 connects C1 as before when the solenoid is being picked up, but blocks that path when the solenoid is dropped. Instead, resistor R3 is inserted in the path, operating transistor 13. A portion of the current from C1 is directed by diode D2 to resistor R4 to discharge the capacitor. The remainder of the current is supplied through resistor R5 as reverse current to the solenoid, speeding its release.

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