Browse Prior Art Database

Magnetic Core Driver

IP.com Disclosure Number: IPCOM000098652D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Vincent, WR: AUTHOR [+2]

Abstract

The circuit provides a single standardized power pulse, suitable for switching magnetic cores, in response to an input signal which may vary in duration or amplitude.

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Magnetic Core Driver

The circuit provides a single standardized power pulse, suitable for switching magnetic cores, in response to an input signal which may vary in duration or amplitude.

The leading edge of a positive input signal at terminal 1 is coupled through capacitor 2 to the base of transistor 3, biasing the transistor for increased conduction. As conduction increases, the change in current through the collector circuit causes regenerative feedback through transformer 4 to the base of transistor 3 which goes toward saturation. The transistor is cut off when saturation is reached because the differentiating action of C causes the input pulse to die out and feedback bias ceases when the current becomes steady at saturation.

The resonant action of inductance 5 (which may be the inductance of the primary of transformer 4), capacitance 6 and resistance 7 controls the rate of change of current through the transistor load circuit 8 to provide standardized time duration to the current pulse for proper power output. Dependance on the characteristics of the transistor is thus minimized.

Diode 9 prevents reverse currents from turning on the transistor. Diode 10 provides a low resistance path for positive feedback signals without impairing the function of the negative bias circuit from terminal 11 through resistances 12 and
13.

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