Transceiver device for a bus system and method for reducing conducted emissions
AssigneeRobert Bosch GmbH
InventorsSebastian Stegemann, Steffen Walker
Life of this patent
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Abstract
A transceiver device for a bus system and a method for reducing conducted emissions. The transceiver device has a transmitting stage for transmitting a transmit signal to a first bus wire of a bus of the bus system, in which bus system an exclusive, collision-free access of a user station to the bus of the bus system is at least temporarily ensured, and for transmitting the transmit signal to a second bus wire of the bus, a receiving stage for receiving the bus signal transmitted on the bus wires, and an emission reduction unit for controlling a switch-on path of a first stand-off device in the transmitting stage as a function of whether or not a dominant stage of the transmit signal occurs.
Claims16
A transceiver device for a bus system, comprising:
- a transmitting stage to transmit a transmit signal to a first bus wire of a bus of the bus system, wherein in the bus system, an exclusive, collision-free access of a user station to the bus of the bus system is at least temporarily ensured, and configured to transmit the transmit signal to a second bus wire of the bus;
- a receiving stage to receive a bus signal transmitted on the bus wires;
- and
- an emission reduction unit to control a switch-on path of a first stand-off device in the transmitting stage as a function of whether or not a dominant state of the transmit signal occurs;
- wherein the emission reduction unit includes:
- a logic block to evaluate the transmit signal and a signal received by the bus;
- a resistor which is connected at one end to a gate of the stand-off device and at its other end to ground;
- and
- a switch to switch the gate of the stand-off device as a function of an evaluation result of the logic block.
A bus system, comprising:
- a bus;
- and
- at least two user stations,. which are interconnected via the bus so that they are able to communicate with one another, wherein at least one of the at least two user stations includes a transceiver device including:
- a transmitting stage to transmit a transmit signal to a first bus wire of a bus of the bus system, wherein in the bus system, an exclusive, collision-free access of a user station to the bus of the bus system is at least temporarily ensured, and to transmit the transmit signal to a second bus wire of the bus;
- a receiving stage to receive a bus signal transmitted on the bus wires;
- and
- an emission reduction unit to control a switch-on path of a first stand-off device in the transmitting stage as a function of whether or not a dominant state of the transmit signal occurs;
- wherein the emission reduction unit includes:
- a logic block to evaluate the transmit signal and a signal received by the bus;
- a resistor which is connected at one end to a gate of the stand-off device and at its other end to ground;
- and
- a switch to switch the gate of the stand-off device as a function of an evaluation result of the logic block.
A method for reducing conducted emissions carried out using a transceiver device for a bus system, the method comprising following steps:
- transmitting, using a transmitting stage, a transmit signal to a first bus wire of a bus of the bus system, in which an exclusive, collision-free access of a user station to the bus of the bus system is at least temporarily ensured, the transceiver device including the transmitting stage, a receiving stage, and an emission reduction unit;
- transmitting the transmit signal to a second bus wire of the bus;
- receiving, using the receiving stage, a bus signal transmitted on the bus wires;
- and
- controlling, using the emission reduction unit, a switch-on path of a first stand-off device in the transmitting stage as a function of whether a dominant state of the transmit signal occurs;
- wherein the emission reduction unit includes:
- a logic block to evaluate the transmit signal and a signal received by the bus;
- a resistor which is connected at one end to a gate of the stand-off device and at its other end to ground;
- and
- a switch to switch the gate of the stand-off device as a function of an evaluation result of the logic block.
Dependencies are inferred from the claim text.