US3916221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.C. voltage detector with delayed triggering signal generation
Assignee: Alcatel CIT SA
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Filing: 1974-01-02
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Granted: 1975-10-28
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Expires: 1994-01-02
Abstract
Abstract Circuitry used in detecting a data signal on an electric transmission line includes a detector with a charge capacitor and a circuit comprising a diode, resistors and an auxiliary capacitor. Upon the appearance of a data signal at the input of the detector, the circuitry generates a delayed triggering signal at its output due to the parallel connection of the charge and auxiliary capacitors and the resulting large time constant of the circuitry. When the data signal ceases to appear, the diode becomes reverse biased by the charge having been stored on the auxiliary capacitor, and since the time constant of the circuitry is thereby made smaller, the provision of the triggering signal is rapidly ended.
Inventors
- 👤 Marcel-Louis Boyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:46
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H04; H04L; H04L1/00; H04L1/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A circuit for detecting an alternating current voltage comprising peak-to-peak detector means, responsive to the application of said alternating current voltage at its input, for generating at its output a direct current voltage having a value corresponding to the peak-to-peak voltage of said alternating current voltage; a series connection of a first resistor, a diode and a first capacitor connected across said output of said peakto-peak detector means, said diode being reverse biased by said capacitor upon the termination of said application of said alternating current voltage; a second resistor connected across said first capacitor and an output resistor connected across the series circuit of said diode and said first capacitor, wherein said series connection introduces a delay in the appearance of said direct current voltage across said output resistor.
Claim 2
Dependent Claim
130 words
A circuit for detecting an alternating current voltage comprising peak-to-peak detector means, responsive to the application of said alternating current voltage at its input, for generating at its output a direct current voltage having a value corresponding to the peak-to-peak voltage of said alternating current voltage; a series connection of a first resistor, a diode and a first capacitor connected across said output of said peakto-peak detector means, said diode being reverse biased by said capacitor upon the termination of said application of said alternating current voltage; a second resistor connected across said first capacitor and an output resistor connected across the series circuit of said diode and said first capacitor, wherein said series connection introduces a delay in the appearance of said direct current voltage across said output resistor.
Claim 3
Dependent Claim
53 words
A circuit as defined in claim 1 wherein said peak-to-peak detector means includes a second diode in series with said first resistor, a third capacitor connected across said series connection of said first resistor, diode and first capacitor, and a third diode connected in series with said second diode across said third capacitor.
Claim 4
Dependent Claim
18 words
A circuit as defined in claim 2 wherein a rapid discharge circuit is connected across said output resistor.
Claim 5
Dependent Claim
20 words
A circuit as defined in claim 2 wherein a peak limiter circuit is connected in series with said second capacitor.
Claim 6
Dependent Claim
50 words
A circuit as defined in claim 4 wherein a third resistor is connected in series with said output resistor, and a Zener diode connected between the point of connection of said output resistor and said third resistor and the point of connection of said second diode and said third capacitor.
Claim 7
Dependent Claim
118 words
A circuit for detecting an alternating current voltage, comprising a peak-to-peak detector including first and second diodes and first and second capacitors, said first and second diodes connected in series across said second capacitor, and said first capacitor connected to the point of connection of said first and second diodes, an input of the circuit being applied to said point of connection through said first capacitor; a series connection of a first resistor, a third diode and a third capacitor, said series connection connected across said second capacitor; and a second resistor connected in parallel with said third capacitor, the output of the circuit being derived across the series connection of said third diode and said third capacitor.
Claim 8
Dependent Claim
118 words
A circuit for detecting an alternating current voltage, comprising a peak-to-peak detector including first and second diodes and first and second capacitors, said first and second diodes connected in series across said second capacitor, and said first capacitor connected to the point of connection of said first and second diodes, an input of the circuit being applied to said point of connection through said first capacitor; a series connection of a first resistor, a third diode and a third capacitor, said series connection connected across said second capacitor; and a second resistor connected in parallel with said third capacitor, the output of the circuit being derived across the series connection of said third diode and said third capacitor.
Claim 9
Dependent Claim
18 words
A circuit as defined in claim 6, further comprising a rapid discharge circuit connected to said third capacitor.
Claim 10
Dependent Claim
53 words
A circuit as defined in claim 7, wherein said rapid discharge circuit includes an amplifier connected between a power source and the point of connection of said first resistor and said third diode, and a transistor connected between said amplifier and the point of connection of said third diode and said third capacitor.
Claim 11
Dependent Claim
20 words
A circuit as defined in claim 6, further comprising a peak limiter circuit connected in series with said first capacitor.
Claim 12
Dependent Claim
57 words
A circuit as defined in claim 9, further comprising a load resistor coupled across the series connection of said third diode and said third capacitor, a third resistor connected in series with said load resistor, and a Zener diode connected between said load resistor and the point of connection of said second diode and said second capacitor.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |