Browse Prior Art Database

Core Driver

IP.com Disclosure Number: IPCOM000098611D
Original Publication Date: 1959-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Stahl, WL: AUTHOR [+2]

Abstract

This circuit provides a single drive pulse of known characteristics as a result of an input pulse which may vary in duration and amplitude.

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Core Driver

This circuit provides a single drive pulse of known characteristics as a result of an input pulse which may vary in duration and amplitude.

Thyratron transistor 1 is normally biased off by voltage divider resistors 2 and 3 and clamping diode 4. A positive input pulse across terminals 5 and 6 through capacitor 7 turns it on. With the collector connected to positive terminal 8, and the emitter connected to ground through the load, the transistor exhibits thyratron characteristics, i. e., remains conducting regardless of the bias voltage, so long as the collector remains positive with respect to the emitter.

The extinguishing circuit comprises choke 9 and an RC network made up of resistor 10 and capacitor 11. When transistor 1 turns on, current flows as capacitor 11 charges toward 60 volts. As the capacitor charges and the current through it decreases, the collapsing field about choke 9 continues to charge capacitor 11 beyond 60v. At a point during the collapse of the field about the choke and the charging of the capacitor, the emitter of transistor 1 becomes positive with respect to the collector, turning the transistor off. This extinguishing voltage breaks down the transistor, but diode 12, which is chosen to have a much higher reverse resistance than the transistor, limits reverse current through the transistor to a non-destructive value. An inductive load such as a magnetic core may be connected across terminals 13 and 14. Positive transients induce...