Browse Prior Art Database

Constant Current Driver

IP.com Disclosure Number: IPCOM000097108D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

A constant current driver for a load L such as a core matrix drive line comprises transistor X-1 operating as an inverter to control transistors X-2 and X-3 which are connected in a tightly coupled degenerative feedback arrangement.

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Constant Current Driver

A constant current driver for a load L such as a core matrix drive line comprises transistor X-1 operating as an inverter to control transistors X-2 and X- 3 which are connected in a tightly coupled degenerative feedback arrangement.

The input to X-1 is through capacitor C for a negative-going signal. Diode D1 clamps the base of X-1 at about. 5 volt above ground so that X-2 and X-3 are initially cut off. Diode D2 holds the base of X-2 at about. 5 volt below its emitter initially.

When a negative pulse is applied at capacitor C, X-1 conducts and turns X-3 on. X-2 conducts, in accordance with variations in load current as measured by the voltage drop across resistor R, only sufficiently to control the load current by varying the base drive of X-3.

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