US3810034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optoelectric signal coupler
Assignee: Siemens AG
•
Filing: 1972-08-29
•
Granted: 1974-05-07
•
Expires: 1992-08-29
Abstract
Abstract Apparatus is described for transmitting d.c. signals from an input circuit to an output circuit electrically isolated from the input circuit. Optoelectric coupling is used to achieve the isolation. Photodiodes form the output of the optoelectric couplers, and the photodiodes are connected in series, if more than one coupler is used, and are reverse-biased. Each photodiode has an output terminal connected to an input of an operational amplifier. The input terminals of the amplifier are connected across the fixed ends of a potentiometer, and the variable tap is grounded in common with the ground connection of the amplifier. Positive feedback resistances couple the amplifier outputs to its inputs, and these resistances have values such that the output voltage of the amplifier assumes a value corresponding to the input signal received by the optoelectric couplers.
Inventors
- 👤 G Brunsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03F; H03F3/00; H03F3/04; H03F3/08; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
Apparatus for transmitting d.c. signals from an input circuit to an output circuit electrically isolated from said input circuit, comprising: luminescent means for receiving input signals and converting same to light of an intensity corresponding to said input signal values, at least one photodiode arranged to receive said light and convert it to corresponding electrical signals, voltage means for reverse biasing said photodiode, operational amplifier means having an input connected to an output of said photodiode, potentiometer means having its fixed terminals connected in parallel with the input terminals of said amplifier and a variable terminal connected in common with a terminal of said amplifier to a reference voltage and at least one positive feedback resistance connecting an output of said amplifier to an input of said amplifier, said feedback resistance having a resistance value such that the output voltage of said amplifier will be caused to assume a value corresponding to the value of said input signal.
Claim 2
Dependent Claim
158 words
Apparatus for transmitting d.c. signals from an input circuit to an output circuit electrically isolated from said input circuit, comprising: luminescent means for receiving input signals and converting same to light of an intensity corresponding to said input signal values, at least one photodiode arranged to receive said light and convert it to corresponding electrical signals, voltage means for reverse biasing said photodiode, operational amplifier means having an input connected to an output of said photodiode, potentiometer means having its fixed terminals connected in parallel with the input terminals of said amplifier and a variable terminal connected in common with a terminal of said amplifier to a reference voltage and at least one positive feedback resistance connecting an output of said amplifier to an input of said amplifier, said feedback resistance having a resistance value such that the output voltage of said amplifier will be caused to assume a value corresponding to the value of said input signal.
Claim 3
Dependent Claim
95 words
The apparatus defined in claim 1 having two said luminescent means, each of which is responsive to a different polarity of said input signal and having two said photodiodes, each arranged to be response, respectively, to a different one of said two luminescent means, each said photodiode having one terminal connected to said voltage means as to be reverse biased and each said photodiode having the other terminal connected to a different input terminal of said amplifier, said fixed terminals of said potentiometer being connected in parallel with said other terminals of said two photodiode.
Claim 4
Dependent Claim
20 words
The apparatus defined in claim 2 wherein a said positive feedback resistance is connected to each input of said amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |