Patent US4734919A successfully refreshed from Google Patents.
US4734919A
Expired / Lapsed
US
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Circuit for serial data communication and power transmission
Assignee: LG Electronics Inc
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Filing: 1982-02-12
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Granted: 1988-03-29
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Expires: 2002-02-12
Abstract
Abstract A circuit for serial data communication and power transmission between a main controller and a sub-station along two balanced transmission lines. The circuit includes a power supply for providing a DC voltage to the sub-station along the transmission lines. A main controller sending circuit generates two data signals of substantially equal magnitude and opposite polarity and supplies the data signals to the transmission lines. A sub-station receiving circuit detects the data signals, on the transmission lines and converts the data signals into a serial format output data signal.
Inventors
- 👤 Choe J. Tae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:31
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/548; H04B3/02; H04B3/04; H04B2203/00; H04B2203/54; H04B2203/5462; H04B2203/547; H04B2203/5483; H04B2203/5495
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
171 words
A circuit for serial data communication and power transmission between a main controller and sub-station along two balanced transmission lines, comprising: power supply means for providing a DC voltage to the sub-station along the transmission lines, said power supply means including DC voltage supply means and choke coils coupled between the DC voltage supply means and the transmission lines; main controller sending means for generating two first data signals of substantially equal magnitude and opposite polarity in response to a first serial format input signal, and supplying the first data signals along the transmission lines; sub-station receiving means for detecting first data signals on the transmission lines and converting the first data signals into a first serial format output data signal; and regulating means, coupled to the transmission lines for supplying a DC bias voltage to the sub-station receiving means from the DC voltage provided by the power supply means, said regulating means including choke coils coupled to the transmission lines for substantially eliminating non-DC components from the DC bias voltages.
Claim 2
Dependent Claim
171 words
A circuit for serial data communication and power transmission between a main controller and sub-station along two balanced transmission lines, comprising: power supply means for providing a DC voltage to the sub-station along the transmission lines, said power supply means including DC voltage supply means and choke coils coupled between the DC voltage supply means and the transmission lines; main controller sending means for generating two first data signals of substantially equal magnitude and opposite polarity in response to a first serial format input signal, and supplying the first data signals along the transmission lines; sub-station receiving means for detecting first data signals on the transmission lines and converting the first data signals into a first serial format output data signal; and regulating means, coupled to the transmission lines for supplying a DC bias voltage to the sub-station receiving means from the DC voltage provided by the power supply means, said regulating means including choke coils coupled to the transmission lines for substantially eliminating non-DC components from the DC bias voltages.
Claim 3
Dependent Claim
64 words
The circuit of claim 1, further including sub-station sending means for generating two second data signals in response to a second serial format input signal and supplying the second data signals to the transmission lines; and main controller receiving means for detecting the second data signals on the transmission lines and converting the second data signals into a second serial format output data signal.
Claim 4
Dependent Claim
18 words
The circuit of claim 2, wherein the main controller sending means comprises voltage dividing means and switch means.
Claim 5
Dependent Claim
20 words
The circuit of claim 3, wherein the switch means is a transistor and the voltage dividing means are four resistors.
Claim 6
Dependent Claim
17 words
The circuit of claim 2, wherein the sub-station receiving means includes balanced coupling means and differential means.
Claim 7
Dependent Claim
23 words
The circuit of claim 5, wherein the coupling means are two capacitors of equal capacitance and the differential means is a differential amplifier.
Claim 8
Dependent Claim
25 words
The circuit of claim 2, wherein the main controller sending means and receiving means and the sub-station sending means and receiving means are balanced circuits.
Claim 9
Dependent Claim
18 words
The circuit of claim 1, wherein the main controller sending means comprises voltage dividing means and switch means.
Claim 10
Dependent Claim
20 words
The circuit of claim 8, wherein the switch means is a transistor and the voltage dividing means are four resistors.
Claim 11
Dependent Claim
17 words
The circuit of claim 1, wherein the sub-station receiving means includes balanced coupling means and differential means.
Claim 12
Dependent Claim
23 words
The circuit of claim 10, wherein the coupling means are two capacitors of equal capacitance and the differential means is a differential amplifier.
Claim 13
Dependent Claim
19 words
The circuit of claim 1, wherein the main controller sending means and the sub-station receiving means are balanced circuits.
References Cited (Backward Citations)
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US3671671A
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US3835334A
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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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |