US3760284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for taking the mean of several input voltages
Assignee: Bodenseewerk Geratetechnik GmbH
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Filing: 1971-09-20
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Granted: 1973-09-18
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Expires: 1991-09-20
Abstract
Abstract A control apparatus has redundant input signals from which an output signal is produced. There is an input for each input signal respectively and a double-pole between the respective input and the common output. Each double-pole defines a predetermined magnitude of signal that it will pass and predetermined resistance below the threshold so as to limit the extent of the voltage step at the output by interference in a respective channel.
Inventors
- 👤 E Matejka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:54
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/003; H03K19/00392; G; G06; G06G; G06G7/00; G06G7/12; G06G7/25
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
In an apparatus for use with a plurality of channels and of the type for forming the mean value of several input voltages from said channels, said apparatus having a plurality of inputs at which said input voltages are applied respectively, an output at which said mean value appears and a plurality of resistor means with each resistor means connecting a respective input with the output, and wherein each resistor means comprises a voltage dependent double-pole whose resistance becomes very great above a threshold, the improvement comprising: said voltage Ut at said threshold being Ut (n-1/n) Delta Uo where n is the number of inputs of respective resistor branches and U is the tolerance for a maximal occurring signal step in said mean value when there is interference in a channel, and the resistance R of each double-pole has a finite value below the voltage at said threshold of about R Ut/Io where Io iS the required maximal output current at said output.
Claim 2
Dependent Claim
163 words
In an apparatus for use with a plurality of channels and of the type for forming the mean value of several input voltages from said channels, said apparatus having a plurality of inputs at which said input voltages are applied respectively, an output at which said mean value appears and a plurality of resistor means with each resistor means connecting a respective input with the output, and wherein each resistor means comprises a voltage dependent double-pole whose resistance becomes very great above a threshold, the improvement comprising: said voltage Ut at said threshold being Ut (n-1/n) Delta Uo where n is the number of inputs of respective resistor branches and U is the tolerance for a maximal occurring signal step in said mean value when there is interference in a channel, and the resistance R of each double-pole has a finite value below the voltage at said threshold of about R Ut/Io where Io iS the required maximal output current at said output.
Claim 3
Dependent Claim
96 words
In an apparatus as set forth in claim 1, wherein each double-pole includes: a symmetrical field effect transistor having three connections a first of which is a gate connection, a diode and a resistor connected in series between the first and a second of the transistor connections with a first juncture therebetween, a diode and a resistor connected in series between the first and third of the transistor connections with a second juncture therebetween, a balancing resistor, said junctures and said balancing resistor being connected in series between the respective input and output of the double-pole.
Claim 4
Dependent Claim
77 words
In an apparatus as set forth in claim 2 wherein each resistor means includes an operational amplifier having an input and an output connected in the series circuit between said input and output of the respective resistor means, the amplifier output being connected to the first juncture, a negative feedback circuit including a resistor connecting the second juncture with the amplifier input, and a resistor connecting the amplifier input to the input of the respective resistor means.
Claim 5
Dependent Claim
46 words
In an apparatus as set forth in claim 1, wherein each voltage sensitive double-pole includes a pair of field effect transistors connected back-to-back by a pair of resistors and connected in series with a balancing resistor between the input and output of the respective resistor means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |