Patent US2249959A successfully refreshed from Google Patents.
US3609546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for indicating leak currents in a diode matrix by means of current sensors in the conductors of the matrix
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1969-03-13
•
Granted: 1971-09-28
•
Expires: 1989-03-13
Abstract
Abstract An arrangement for indicating eventual leakage currents through the diodes of a diode matrix includes a potential-indicating means connnected to each conductor of the matrix. The deteriorating operation of any of the diodes causes a potential drop in the associated potential which signifies means indicating the conductor to which the faulty diode is connected. Each potential-indicating means is adjusted to give an indication when the potential drop reaches a value including a certain safety factor determined in advance which deviates from the potential drop resulting when a permitted current passes through the conductor.
Inventors
- 👤 Bengt-Gunnar Magnusson
- 👤 Sture Erwin Hilding Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:25
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20; H04Q1/22; H04Q1/24; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
298 words
A selection matrix which is monitored for faults comprising: at least first and second row conductors; at least first and second column conductors; said conductors being insulated from each other; a first impedance means connecting said first row conductor to said first column conductor; a second impedance means connecting said first row conductor to said second column conductor; a third impedance means connecting said second row to said first column conductor; a fourth impedance means connectiNg said second row conductor to said second column conductor; each of said impedance means including an impedance and a diode connected in series; at least four mutually independently operable switchable potential sources; each of said potential sources being connected to one end of each of said conductors, respectively; and at least four indicating means, each of said indicating means being connected to the other end of each of said conductors, respectively, for monitoring the flow of current through the associated conductor and each of said indicating means including means for generating a signal that is related to the current passing through the associated conductor and comparing means for comparing the amplitude of the so generated signal with the amplitude of a reference signal, said comparing means comprising a first resistor having one end connected to said signal generating means, a capacitor having one end connected to the other end of said first resistor, a source of a pulse sampling signal connected to the other end of said capacitor, a diode having one end connected to the other end of said first resistor, an indicator device connected to the other end of said diode, a second resistor having one end connected to said one end of said first resistor, and a reference signal source connected to the other end of said second resistor.
Claim 2
Dependent Claim
298 words
A selection matrix which is monitored for faults comprising: at least first and second row conductors; at least first and second column conductors; said conductors being insulated from each other; a first impedance means connecting said first row conductor to said first column conductor; a second impedance means connecting said first row conductor to said second column conductor; a third impedance means connecting said second row to said first column conductor; a fourth impedance means connectiNg said second row conductor to said second column conductor; each of said impedance means including an impedance and a diode connected in series; at least four mutually independently operable switchable potential sources; each of said potential sources being connected to one end of each of said conductors, respectively; and at least four indicating means, each of said indicating means being connected to the other end of each of said conductors, respectively, for monitoring the flow of current through the associated conductor and each of said indicating means including means for generating a signal that is related to the current passing through the associated conductor and comparing means for comparing the amplitude of the so generated signal with the amplitude of a reference signal, said comparing means comprising a first resistor having one end connected to said signal generating means, a capacitor having one end connected to the other end of said first resistor, a source of a pulse sampling signal connected to the other end of said capacitor, a diode having one end connected to the other end of said first resistor, an indicator device connected to the other end of said diode, a second resistor having one end connected to said one end of said first resistor, and a reference signal source connected to the other end of said second resistor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |