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SCS Latching Matrix Driver

IP.com Disclosure Number: IPCOM000094296D
Original Publication Date: 1966-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Hayes, RA: AUTHOR

Abstract

A single silicon controlled switch SCS can both drive and latch on a load, such as a lamp, if that load is placed in the anode gate of the SCS.

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SCS Latching Matrix Driver

A single silicon controlled switch SCS can both drive and latch on a load, such as a lamp, if that load is placed in the anode gate of the SCS.

Lamp 10 is placed in the anode leg of SCS 12 and is also connected to positive voltage source 14. A first input switch 16 is placed in the cathode gate leg of SCS 12. A second input switch 18 is placed in the anode gate leg of SCS
12. Reset switch 20 is placed in the cathode leg of SCS 12.

A second positive voltage source 22, more positive than source 14, is also placed in the anode gate leg. A negative voltage source 24 is connected to the cathode gate leg of silicon controlled switch 12. Resistive elements are provided in accordance with the principles of circuit requirements.

In operation, closing switch 16 puts SCS 12 in its active region, but does not cause regenerative switching action. Closing switch 18 by itself is also insufficient to cause switching of SCS 12. Closing switches 16, 18 and 20 simultaneously results in a regenerative saturated-latching switching action. Then, lamp 10 is switched on and held on. Subsequently, opening switch 20 resets the device.

If a plurality of lamps is to be driven, a matrix arrangement minimizes the number of input switches needed. Using a matrix, N lamps can be driven with only square root of N input switches. N reset switches are needed. The solid state circuitry eliminates the necessity of additional isolation circuitry between drive lines of a matr...