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Matrix Driver Checking Apparatus

IP.com Disclosure Number: IPCOM000093049D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Harrison, TJ: AUTHOR [+2]

Abstract

When driver circuits are commoned together, current flow in their commoned line can be used, with comparator circuitry, to indicate the status of the drivers.

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Matrix Driver Checking Apparatus

When driver circuits are commoned together, current flow in their commoned line can be used, with comparator circuitry, to indicate the status of the drivers.

A plurality of relay coils 10, 12, 14, and 16 and their associated diodes 18, 20, 22, and 24, arranged in a matrix, is utilized to operate associated switches not shown. lt is necessary to energize a single relay coil at a time. This is accomplished by establishing a current flow through that relay coil. A plurality of driver circuits X1...Xn and Y1...Yn is arranged in rectangular coordinate fashion. In order to energize relay coil 10, for example, it is necessary to have current flowing coincidentally from driver X1 and driver Y1. No other relay coil shown has current coincidentally supplied from an X driver and a Y driver under the stated conditions. Thus no other coil is energized. If two drivers X1...Xn or Y1...Yn be energized at one time, more than one relay coil is energized and an error condition results. Thus, it is desirable to monitor the operation of drivers X1...Xn and Y1... Yn so as to insure that only one X driver and one Y driver are on at the same time.

This is realized by commoning the drive lines for drivers X1...Xn in a single line 26 and commoning the drive lines for drivers Y1...Yn in a similar line 28. A plurality of resistors can then be inserted in each line, resistors 30 and 32 in line 26 and resistors 34 and 36 in line 28. Associated with each resistor is a comparator circuit 38, 40, 42, and 44 resp...