US3675109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information transmitting device
Assignee: Sweda International Inc
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Filing: 1970-11-18
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Granted: 1972-07-04
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Expires: 1990-11-18
Abstract
Abstract A device for transmitting information, represented by different levels of DC-voltage, from a transmitter to a receiver galvanically separated from the transmitter. A transformer, one winding of which forms a part of a LC-oscillator, and the second winding of the transformer is connected to a first transistor via a diode, the transistor in emitter-follower configuration. A second transistor, also having an emitter follower configuration is a part of the LC-oscillator. A second output diode is connected to the emitter of the second transistor. The arrangement being so designed that the voltage level appearing at the cathode of the second diode corresponds to the input voltage level appearing at the input of the first transistor.
Inventors
- 👤 Hilding G Skoog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:32
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/0266; H04L25/0268
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A device for transmitting information represented by different levels of DC-voltage from a transmitter to a receiver galvanically separated from the transmitter comprising; a transformer, a first rectifier connected to the primary winding of said transformer, a second rectifier, a transmitter in series with said first rectifier, an oscillator of the Colpitt''s LC- type part of which is formed by the secondary winding of the transformer, and includes a transistor, and wherein the secondary winding is connected between a base and collector of said transistor and further wherein capacitors are connected between said base and the emitter and between the emitter and the collector of the transistor, and wherein said second rectifier is coupled to the output of said oscillator, and whereby a DC-voltage of a specific level supplied to the primary winding of the transformer will cause a DC-voltage of a corresponding level to appear as an output signal via said second rectifier.
Claim 2
Independent Claim
154 words
A device for transmitting information represented by different levels of DC-voltage from a transmitter to a receiver galvanically separated from the transmitter comprising; a transformer, a first rectifier connected to the primary winding of said transformer, a second rectifier, a transmitter in series with said first rectifier, an oscillator of the Colpitt''s LC- type part of which is formed by the secondary winding of the transformer, and includes a transistor, and wherein the secondary winding is connected between a base and collector of said transistor and further wherein capacitors are connected between said base and the emitter and between the emitter and the collector of the transistor, and wherein said second rectifier is coupled to the output of said oscillator, and whereby a DC-voltage of a specific level supplied to the primary winding of the transformer will cause a DC-voltage of a corresponding level to appear as an output signal via said second rectifier.
Claim 3
Independent Claim
61 words
A device for transmitting information represented by different levels of DC-voltage from a transmitter to a receiver comprising; a transformer having primary windings and secondary windings, the primary windings galvanically coupled to the transmitter, and an oscillator of the inductive-capacitive type, having its inductive portion formed by the secondary windings of the transformer, galvanically separated from the transmitter by said transformer.
Claim 4
Independent Claim
61 words
A device for transmitting information represented by different levels of DC-voltage from a transmitter to a receiver comprising; a transformer having primary windings and secondary windings, the primary windings galvanically coupled to the transmitter, and an oscillator of the inductive-capacitive type, having its inductive portion formed by the secondary windings of the transformer, galvanically separated from the transmitter by said transformer.
Claim 5
Dependent Claim
67 words
The device of claim 5 wherein both windings of the transformer have windings in the same direction and the transistor is an NPN transistor operating as an emitter follower and the second rectifier is connected to the emitter of the transistor so that an increase in the input voltage to the primary winding of the transformer results in an increased output voltage level after the second rectifier.
Claim 6
Dependent Claim
65 words
The device of claim 5 wherein the primary winding of the transformer Includes a transistor, its base-emitter being connected in series with the first rectifier and the primary winding and its collector-emitter being connected in parallel with a series circuit formed by the first rectifier and the primary winding, DC-voltages which shall be transmitted being supplied between the base and the collector of the transistor.
Claim 7
Dependent Claim
27 words
The device of claim 2 wherein only the secondary windings of the transformer form the inductive portion of the oscillator and is directly coupled in said oscillator.
Claim 8
Dependent Claim
37 words
The device of claim 2 further including, variable impedance means, coupled to the primary windings of said transformer, responsive to the magnitude of the DC-voltage from the transmitter, for controlling the magnitude of the oscillator''s output signal.
Claim 9
Dependent Claim
46 words
The device of claim 2 further including, variable impedance means, coupled to the primary windings of said transformer, responsive to the magnitude of the DC-voltage from the transmitter and the voltage induced in the primary winding of the transformer from the secondary windings of the oscillator.
Claim 10
Dependent Claim
47 words
The device of claim 7 wherein said variable impedance means includes an electronic valve means and a unidirectional conducting means, said electronic valve means being controlled by said DC-voltage and the voltage induced in the primary windings of the transformer from the secondary windings of the oscillator.
Claim 11
Dependent Claim
38 words
The device of claim 8 wherein the electronic valve means includes a transistor and wherein said unidirectional conducting means includes a diode, and wherein said diode and transistor are in series with the primary windings of said transformer.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |