Patent US3865979A successfully refreshed from Google Patents.
US3865979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix control circuit
Assignee: Individual
•
Filing: 1973-06-21
•
Granted: 1975-02-11
•
Expires: 1993-06-21
Abstract
Abstract A matrix control circuit using ground potential marks to implement the switch through of a switching network. The ground reduces transients on the matrix during the switching and makes it easier to control the rate of rise of the signal which is especially important when using switching elements, such as silicon control rectifiers. The matrix control circuits also include a constant current source for use in holding the network switched through.
Inventors
- 👤 Alfred Hestad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:33
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A matrix control switching arrangement for use with automatic switching systems to interconnect selected inlets and outlets, said system comprising a plurality of cascaded matrices arranged in first, intermediate and final stages, each matrix including intersecting horizontal and vertical busses, cross point switching elements for selectively interconnecting selected ones of said horizontal and vertical busses, said switching elements comprising switching devices having separate control paths and communication paths, a matrix control arrangement for applying end marking potentials at the output side of the network to cooperate with end marking potentials at the input side of the network to cause a fan out beginning at the end marked points and extending through the network, said matrix control arrangement being common to a plurality of matrices, said matrix control circuit arrangement comprising means using ground end marking potentials for detecting and switching through the switching network, and means responsive to the switching through of the path for providing holding current therefor.
Claim 2
Dependent Claim
159 words
A matrix control switching arrangement for use with automatic switching systems to interconnect selected inlets and outlets, said system comprising a plurality of cascaded matrices arranged in first, intermediate and final stages, each matrix including intersecting horizontal and vertical busses, cross point switching elements for selectively interconnecting selected ones of said horizontal and vertical busses, said switching elements comprising switching devices having separate control paths and communication paths, a matrix control arrangement for applying end marking potentials at the output side of the network to cooperate with end marking potentials at the input side of the network to cause a fan out beginning at the end marked points and extending through the network, said matrix control arrangement being common to a plurality of matrices, said matrix control circuit arrangement comprising means using ground end marking potentials for detecting and switching through the switching network, and means responsive to the switching through of the path for providing holding current therefor.
Claim 3
Dependent Claim
25 words
The matrix control circuit arrangement of claim 1 including means for enabling cross point switching elements in the final stage of said multi-stage switching network.
Claim 4
Dependent Claim
54 words
The matrix control circuit arrangement of claim 2 wherein said cross point switching elements comprise semi-conductor devices having switching functions that vary in accordance with the slope and frequency of the switching signal, and wherein said enabling means for the final stage includes means for minimizing rate effect on the cross point switching elements.
Claim 5
Dependent Claim
35 words
The matrix control circuit arrangement of claim 3 wherein the means for minimizing the rate effect comprises means for controlling the rate of rise of the signal used to switch through an enabled switching element.
Claim 6
Dependent Claim
29 words
The matrix control circuit arrangement of claim 1 wherein said ground potential is provided responsive to a mark pulse applied to the input of said matrix control circuit arrangement.
Claim 7
Dependent Claim
72 words
The matrix control circuit arrangement of claim 5 wherein said means for providing the ground at the output of said matrix control circuit arrangement comprises a first diode connected to ground, second diode means for normally blocking the first diode to prevent conduction therethrough, and switching means operated by said mark pulse for connecting unblocking voltage to said grounded diode to thereby provide ground to said output responsive to said mark pulse.
Claim 8
Dependent Claim
22 words
The matrix control circuit arrangement of claim 1 including constant current source means for providing holding current to said switched through path.
Claim 9
Dependent Claim
49 words
The matrix control circuit arrangement of claim 7 wherein the constant current source means comprises a first transistor, said first transistor normally biased to the non-conducting state, and means responsive to changed signal on the switched through path for varying the bias to cause said first transistor to conduct.
Claim 10
Dependent Claim
117 words
The matrix control circuit arrangement of claim 8 wherein said last named means comprises a second transistor normally biased to the non-conducting condition, means responsive to the application of the ground signal to the output of said matrix control circuit arrangement followed by the switching through of the path for causing said second transistor to switch on and to thereby cause the first transistor comprising the constant current source means to operate and provide an opposite signal to said switched through path, and further swItching means operated responsive to the switching on of the first transistor constant current control to maintain the first transistor in the operated condition even when the opposite signal is on the output.
Claim 11
Dependent Claim
31 words
The matrix control circuit arrangement of claim 1 wherein sequential allotting means are provided for controlling the intermediate stage switching elements, and said allotting means including square wave signal generating means.
References Cited (Backward Citations)
US3251036A
Cited
US3531773A
Cited
US3626111A
Cited
US3573384A
Cited
US3585310A
Cited
US3720792A
Cited
US3646368A
Cited
US3694812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |