Bus station, bus system, and method for transmitting data in a two-wire bus system
AssigneeRobert Bosch GmbH
InventorsNorman Schuetze, Thomas Walker, Balint Nagy, Matthias Renner, Michael Gerlach, Stephan Voehringer
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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.
Claims10
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.