EP 0619888 A4 19950726 - OSCILLATOR AND RECTIFIER CIRCUITS FOR PROXIMITY SWITCHES.
Title (en)
OSCILLATOR AND RECTIFIER CIRCUITS FOR PROXIMITY SWITCHES.
Title (de)
OSZILLATOR UND GLEICHRICHTER-SCHALTUNGEN FÜR EIN ANNÄHERUNGSSCHALTER.
Title (fr)
CIRCUITS OSCILLATEURS ET REDRESSEURS POUR INTERRUPTEURS DE PROXIMITE.
Publication
Application
Priority
- GB 9127570 A 19911231
- US 9211233 W 19921228
Abstract (en)
[origin: GB2263025A] When a critically damped oscillator is used in inductive proximity sensors there is no electrical information regarding the target position when the target is closer than the detection distance. This is detrimental to the speed of operation of the proximity sensor when the target is removed. The invention, therefore, provides a proximity switch circuit including first and second transistors (Q4, Q6) connected as a long tail pair with an inductive sensing circuit (LC) connected to one leg thereof and an emitter follower circuit (Q7, Q8) connected between said one leg and the base of the transistor of the other leg, whereby an oscillator circuit can be provided which is non-critically damped to enable faster speed of operation of the proximity switch.
IPC 1-7
IPC 8 full level
H03K 17/95 (2006.01)
CPC (source: EP)
H03K 17/9535 (2013.01)
Citation (search report)
- [XA] US 3609580 A 19710928 - THOMPSON FRANCIS T, et al
- See references of WO 9313436A1
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
GB 2263025 A 19930707; GB 2263025 B 19960103; GB 9127570 D0 19920219; EP 0619888 A1 19941019; EP 0619888 A4 19950726; WO 9313436 A1 19930708
DOCDB simple family (application)
GB 9127570 A 19911231; EP 93902773 A 19921228; US 9211233 W 19921228