Bus station, bus system, and method for transmitting data in a two-wire bus system

Patent metadata

Field	Value
Publication number	US-12549221-B2
Application number	US-202218562715-A
Country	US
Kind code	B2
Filing date	May 24, 2022
Priority date	May 31, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A bus station, a two-wire bus system, and methods for transmitting data in a two-wire bus system. The method includes: supplying a variable battery voltage to a first bus station and a second bus station, and transmitting data from the first bus station to the second bus station using a modulation signal that is superposed on the variable battery voltage, wherein the modulation signal is adjusted to follow a level of the variable battery voltage in a predefined manner.

First claim

The invention claimed is:

1 . A method for transmitting data in a two-wire bus system, comprising the following steps:
supplying a first bus station and a second bus station with a variable battery voltage; and transmitting data from the first bus station to the second bus station using a modulation signal superposed on the variable battery voltage, wherein the modulation signal is adjusted to follow a level of the variable battery voltage in a predefined manner, wherein the modulation signal comprises a high level defined by subtracting a first predefined voltage from the variable battery voltage, and a low level defined by subtracting a second, higher predefined voltage from the variable battery voltage, such that the modulation signal floats with the variable battery voltage.

2 . The method according to claim 1 , wherein a difference: (i) between the variable battery voltage and high levels of the modulation signal and/or (ii) between the high levels and low levels of the modulation signal, is kept constant.

3 . A method for transmitting data in a two-wire bus system, comprising the following steps:
supplying a first bus station and a second bus station with a variable battery voltage; and transmitting data from the first bus station to the second bus station using a modulation signal superposed on the variable battery voltage, wherein the modulation signal is adjusted to follow a level of the variable battery voltage in a predefined manner, wherein a mean value of the modulation signal is adjusted to follow the variable battery voltage at a predefined offset.

4 . The method according to claim 1 , wherein all bus stations present in the two-wire bus system are supplied by a battery, which provides the variable battery voltage.

5 . The method according to claim 1 , wherein the modulation signal is derived from the variable battery voltage using a modulation resistor, through which a current that is predefined for generating the modulation signal flows.

6 . A method for transmitting data in a two-wire bus system, comprising the following steps:
supplying a first bus station and a second bus station with a variable battery voltage; and transmitting data from the first bus station to the second bus station using a modulation signal superposed on the variable battery voltage, wherein the modulation signal is adjusted to follow a level of the variable battery voltage in a predefined manner, wherein the modulation signal is derived from the variable battery voltage using a modulation resistor, through which a current that is predefined for generating the modulation signal flows, wherein a desired voltage swing between a high level and a low level of the modulation signal is generated using a plurality of current sources between the modulation resistor and an electrical ground.

7 . The method according to claim 1 , wherein the modulation signal is generated from the variable battery voltage using a control stage and a driver stage.

8 . The method according to claim 1 , wherein no voltage regulator is present in the first bus station.

9 . A bus station for use as a first bus station, comprising:
a two-wire bus terminal configured for communication and to obtain a variable battery voltage; wherein the first bus station is configured to supply a second bus station with energy via the two-wire bus terminal using the variable battery voltage, and to transmit a modulation signal, superposed on the variable battery voltage, to the second bus station, wherein the first bus station is further configured to adjust the modulation signal to follow a level of the variable battery voltage in a predefined manner, wherein the modulation signal comprises a high level defined by subtracting a first predefined voltage from the variable battery voltage, and a low level defined by subtracting a second, higher predefined voltage from the variable battery voltage, such that the modulation signal floats with the variable battery voltage.

10 . A bus system, comprising:
a first bus station, including:
a two-wire bus terminal configured for communication and to obtain a variable battery voltage,
wherein the first bus station is configured to supply a second bus station with energy via the two-wire bus terminal using the variable battery voltage, and to transmit a modulation signal, superposed on the variable battery voltage, to the second bus station, wherein the first bus station is further configured to adjust the modulation signal to follow a level of the variable battery voltage in a predefined manner; and
a second bus station connected to the first bus station using a two-wire line, wherein the modulation signal comprises a high level defined by subtracting a first predefined voltage from the variable battery voltage, and a low level defined by subtracting a second, higher predefined voltage from the variable battery voltage, such that the modulation signal floats with the variable battery voltage.

Assignees

• Bosch Gmbh Robert

Inventors

• Schuetze Norman
• Walker Thomas
• Nagy Balint
• Renner Matthias
• Gerlach Michael
• Voehringer Stephan

Classifications

• H04B3/542

  the information being in digital form · CPC title

• H04B2203/5416

  by adding signals to the wave form of the power source · CPC title

• H04B2203/547

  via DC power distribution · CPC title

• H04L12/12

  Arrangements for remote connection or disconnection of substations or of equipment thereof · CPC title

• H04B3/548 Primary

  the power on the line being DC (arrangements for feeding power H04L12/10; extracting feeding power from signals H04L25/02) · CPC title