Transformational bus coupling

• US 20050163112A1
• Filed: 12/20/2004
• Published: 07/28/2005
• Est. Priority Date: 12/23/2003
• Status: Active Grant

• Current Assignee: Airbus Operations GmbH (Airbus SE)
• Original Assignee: Airbus Deutschland GmbH (Airbus SE)
• Inventors: Rieckmann, Norbert
• Granted Patent: US 7,564,324 B2
• Time in Patent Office: Days
• US Class Current: 370/362
• CPC Class Codes: H04B 2203/5425 improving S/N by matching impedance, noise reduction, gain control
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• CPC Class Codes: H04B 3/56 Circuits for coupling, blocking, or by-passing of signals
• CPC Class Codes: H04L 12/40 Bus networks
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 2012/4028 the transportation system being an aircraft
• CPC Class Codes: H04L 25/0266 Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
• CPC Class Codes: H04L 25/0274 Arrangements for ensuring balanced coupling
• CPC Class Codes: H04L 25/0278 Arrangements for impedance matching

Abstract

Currently, in transformationally coupled linear data bus systems having separate transmission and reception lines, two transformers are used in order to achieve electrical isolation of data bus and terminal. According to one exemplary embodiment of the present invention, a data bus system is specified in which the terminal is connected via a directional coupler to the data bus lines in order to transmit and receive data via the data bus.

Claims

1. A data bus system, comprising

a data bus and a terminal;

wherein the data bus has a first data line and a second data line; and

wherein the terminal is connected via a directional coupler to the first and the second data lines in order to transmit and receive data via the data bus.

2. The data bus system according to claim 1,

wherein the terminal has a transmitter and a receiver;

and

wherein the receiver is isolated from the transmitter by the directional coupler.

3. The data bus system according to claim 2,

wherein the directional coupler relays an input signal coming from the bus line to the transmitter and the receiver;

and

wherein the directional coupler relays an output signal going from the transmitter to the data bus to the data bus, but not to the receiver.

4. The data bus system according to claim 1,

wherein the directional coupler is designed so that in the event of a non-transmitting transmitter, an input impedance assigning the data bus is adapted in such a way that no reflections arise on the data bus.

5. The data bus system according to claim 1,

wherein the directional coupler has a transformer;

and

wherein the transformer essentially has a turn ratio of primary {square root}2 to secondary 2×

1.

6. The data bus system according to claim 1,

wherein the data bus system is designed as a data bus for an aircraft;

and

wherein the terminal is an aircraft system in the aircraft.

7. A terminal for connection and operation with a data bus, wherein the data bus has a first and a second data line;

wherein the terminal comprises;

a directional coupler; and

wherein the terminal is connected to the first and the second data lines using the directional coupler in order to transmit and receive data via the data bus.

8. The terminal according to claim 7,

wherein the terminal has a transmitter and a receiver;

and

wherein the receiver is isolated from the transmitter by the directional coupler.

9. The terminal according to claim 8,

wherein the directional coupler relays an input signal coming from the bus line to the transmitter and the receiver;

and

wherein the directional coupler relays an output signal going from the transmitter to the data bus to the data bus, but not to the receiver.

10. The terminal according to claim 7,

wherein the directional coupler is designed so that in the event of a non-transmitting transmitter, an input impedance which assigns the data bus is adapted in such a way that no reflections arise on the data bus.

11. The terminal according to claim 7,

wherein the directional coupler has a transformer;

and

wherein the transformer essentially has a turn ratio of primary {square root}2 to secondary 2×

1.

12. The terminal according to claim 7,

wherein the terminal is part of an aircraft system of an aircraft.

13. A data transmission method for transmitting data between a data bus and a terminal,

wherein the data bus has a first and a second data line, the method comprising the following step:

connecting the first and the second data lines to the terminal using a directional coupler to transmit and receive data via the data bus.

14. The method according to claim 13, further comprising the following steps:

isolating a receiver and a transmitter of a terminal using a directional coupler; and

adapting an input impedance of the directional coupler which assigns the data bus in the event of a non-transmitting transmitter in such a way that no reflections arise on the data bus.

15. The method according to claim 14,

wherein the method is used on a data bus of an aircraft.