Subscriber station for a bus system and method for reducing wire-bound emissions in a bus system

Patent metadata

Field	Value
Publication number	US-2016285653-A1
Application number	US-201415034456-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Nov 8, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

A subscriber station for a bus system and a method for reducing wire-bound emissions in a bus system are provided. The subscriber station includes a digital-analog converter for converting a digital signal into an analog signal, and an analog-digital converter, the digital-analog converter and the analog-digital converter being connected for a balancing of the dominant bus state of the bus system.

First claim

1 - 10 . (canceled)

11 . A subscriber station for a bus system, comprising:
a digital-analog converter for converting a digital signal into an analog signal; and an analog-digital converter, the digital-analog converter and the analog-digital converter being connected for a balancing of a dominant bus state of the bus system.

12 . The subscriber station as recited in claim 11 , wherein the digital-analog converter is fashioned for at least one of: i) cyclical execution of the balancing, and ii) on-chip execution of the balancing.

13 . The subscriber station as recited in claim 11 , further comprising:
a volatile memory in which a control word of the digital-analog converter for carrying out the balancing is stored.

14 . The subscriber station as recited in claim 11 , further comprising:
a switch for separating the digital-analog converter and the analog-digital converter from a bus of the bus system to carry out the balancing.

15 . The subscriber station as recited in claim 14 , wherein the switch includes a PMOS-HV cascode and an NMOS-HV cascode, which can be switched high-ohmic in order to carry out the balancing, to separate the digital-analog converter and the analog-digital converter from the bus of the bus system.

16 . The subscriber station as recited in claim 15 , further comprising:
a short-circuit path from an NV-NMOS transistor to an NV-PMOS transistor for starting a digital control loop for the balancing.

17 . 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 can communicate with one another, wherein at least one of the at least two subscriber stations includes: i) a digital-analog converter for converting a digital signal into an analog signal, and ii) an analog-digital converter, the digital-analog converter and the analog-digital converter being connected for a balancing of a dominant bus state of the bus system.

18 . A method for reducing wire-bound emissions in a bus system, comprising:
providing a digital-analog converter for converting a digital signal into an analog signal and an analog-digital converter in a subscriber station of the bus system; and connecting the digital-analog converter and the analog-digital converter to one another in such a way that the digital-analog converter and the analog-digital converter carry out a balancing of a dominant bus state of the bus system.

19 . The method as recited in claim 18 , wherein at least one of: i) the execution of the balancing is carried out at least one of cyclically and as on-chip balancing, and ii) for the carrying out of the balancing, a control word of the digital-analog converter is used that is stored in a volatile memory.

20 . The method as recited in claim 18 , wherein a PMOS-HV cascode and an NMOS-HP cascode are switched high-ohmic to separate the digital-analog converter and the analog-digital converter from a bus of the bus system for the carrying out of the balancing, in order to start, with a short-circuit path from a first a current-determining element at a side of an output current mirror to a second current-determining element at a side of an output current mirror, a digital control loop in which current of the first current-determining element and second current of the current-determining element is controlled to an approximately equal value, for the balancing.

Assignees

• Bosch Gmbh Robert

Inventors

• Walker Steffen
• Pannwitz Axel

Classifications

• H04L25/02

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

• H04L2012/40215

  Controller Area Network CAN · CPC title

• H04L25/0274 Primary

  Arrangements for ensuring balanced coupling · CPC title

• H04L12/40

  Bus networks · CPC title

• H03K17/04106

  in field-effect transistor switches (H03K17/0412, H03K17/0416 take precedence) · CPC title