Subscriber station for a bus system and method for reducing line-related emissions in a bus system

Patent metadata

Field	Value
Publication number	US-2016269200-A1
Application number	US-201415033919-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Nov 8, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

A subscriber station for a bus system and a method for reducing line-related emissions in a bus system are provided. The subscriber station includes an edge controller for symmetrizing switching edges in the bus system. The edge controller includes an element for generating a setpoint voltage characteristic on a bus in the bus system and a current mirror for transmitting the generated setpoint voltage characteristic to the bus.

First claim

1 - 10 . (canceled)

11 . A subscriber station for a bus system, comprising:
an edge controller for symmetrization of switching edges in the bus system, the edge controller including an element for generating a setpoint voltage characteristic on a bus of the bus system; and a current mirror for transmitting the generated setpoint voltage characteristic to the bus.

12 . The subscriber station as recited in claim 11 , wherein the element for generating the setpoint voltage characteristic includes a Miller capacitor, which is connected to a PMOS transistor at one end and to a resistor at the other end.

13 . The subscriber station as recited in claim 11 , wherein the element for generating the setpoint voltage characteristic includes two current sources which are connected to a PMOS transistor.

14 . The subscriber station as recited in claim 11 , wherein the edge controller includes two current sources, a Miller capacitor, a PMOS transistor, and a resistor.

15 . The subscriber station as recited in claim 14 , wherein the two current sources and the Miller capacitor are connected to the gate of the PMOS transistor.

16 . The subscriber station as recited in claim 11 , wherein the current mirror is formed with MOS low-voltage transistors having an identical structure in the layout.

17 . The subscriber station as recited in claim 11 , wherein the current mirror is connected to the bus via MOS high-voltage transistors.

18 . The subscriber station as recited in claim 11 , further comprising:
a reverse voltage protection diode for protecting against a potential of a dominant level in the bus system; and a reverse voltage protection diode against a signal CAN_L.

19 . A bus system, comprising:
a bus; and at least two subscriber stations connected to one another via the bus in such a way that the subscriber stations are able to communicate with one another, wherein at least one of the at least two subscriber stations includes: i) an edge controller for symmetrization of switching edges in the bus system, the edge controller including an element for generating a setpoint voltage characteristic on a bus of the bus system, and ii) a current mirror for transmitting the generated setpoint voltage characteristic to the bus.

20 . A method for reducing line-related emissions in a bus system, comprising:
generating, by an edge controller for symmetrizing switching edges in the bus system, a setpoint voltage characteristic on a bus of the bus system using an element for generating the setpoint voltage characteristic; and transmitting the setpoint voltage characteristic to the bus via a current mirror.

Assignees

• Bosch Gmbh Robert

Inventors

• Pannwitz Axel
• Hilgenberg Bernd
• Walker Steffen
• Hehemann Ingo

Classifications

• H04L25/0274 Primary

  Arrangements for ensuring balanced coupling · CPC title

• H04L12/40

  Bus networks · CPC title

• H04L2012/40215

  Controller Area Network CAN · CPC title

• H04L25/02

  Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} · CPC title

• H04L5/02 Primary

  Channels characterised by the type of signal · CPC title