WO2011100775A1 - Unterdrückung von überspannung verursacht durch indirekten blitzschlag - Google Patents
Unterdrückung von überspannung verursacht durch indirekten blitzschlag Download PDFInfo
- Publication number
- WO2011100775A1 WO2011100775A1 PCT/AT2011/000082 AT2011000082W WO2011100775A1 WO 2011100775 A1 WO2011100775 A1 WO 2011100775A1 AT 2011000082 W AT2011000082 W AT 2011000082W WO 2011100775 A1 WO2011100775 A1 WO 2011100775A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bus
- winding
- transformer
- signal
- capacitor
- Prior art date
Links
- 230000001629 suppression Effects 0.000 title description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims abstract description 17
- 230000003071 parasitic effect Effects 0.000 claims abstract description 10
- 230000008054 signal transmission Effects 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000006378 damage Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/28—Reducing interference caused by currents induced in cable sheathing or armouring
-
- H04B5/266—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/605—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors with galvanic isolation between the control circuit and the output circuit
- H03K17/61—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors with galvanic isolation between the control circuit and the output circuit using transformer coupling
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/689—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors with galvanic isolation between the control circuit and the output circuit
- H03K17/691—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors with galvanic isolation between the control circuit and the output circuit using transformer coupling
-
- H04B5/22—
Definitions
- the invention relates to a coupling circuit for a bus subscriber to a bus line of a field bus with DC-free and differential, EIA-485 / EIA-422 compliant signal transmission according to a TTP protocol, in which the two inputs / outputs a send / receive component of the bus station with a first winding of a signal transformer and the two poles of the bus line are connected to a second winding of the signal transformer.
- Inductive bus couplers use a signal transformer for galvanic isolation, which acts as a galvanic isolation between the data bus and the bus participant.
- a signal transformer for galvanic isolation acts as a galvanic isolation between the data bus and the bus participant.
- potential differences between the bus participants and the bus participants and the bus line are allowed.
- Taking into account the properties of real signal transformers in contrast to theoretically ideal transformers occurs due to the capacitive coupling between the transformer windings for coupling at least a portion of occurring dynamic disturbances.
- Such over-coupling interference can lead to transmission errors or cause permanent damage to the connected components. Therefore, if necessary, a corresponding protective circuit must adequately suppress these disturbances.
- Common-mode interference caused by indirect lightning strike can occur between reference potentials of the bus users and are often referred to as "ground offset" or they can occur through coupling into the differential bus line.
- An object of the invention is to suppress such interference on the part of the bus subscribers to a safe level, without affecting the signal quality.
- the first winding has a center tap, which is connected to the local reference potential of the bus subscriber via a capacitor whose capacity is at least 100 times the parasitic capacitance of the transformer.
- crosstalk disturbances on the part of the bus subscriber are suppressed.
- the suppression is carried out in a manner that, although common-mode interference can be suppressed, the push-pull useful signal, however, no attenuation dampened.
- the capacitive connection of the center tap to a local reference potential is expedient if connected components superimpose a dc voltage on the useful load signal.
- the parasitic coupling capacitance of the transformer Since the capacitor is located on the isolated side for interference suppression, in addition to the low internal resistance of the interference source, the parasitic coupling capacitance of the transformer also acts. Only then is it possible on the one hand to substantially reduce the interference voltage, and on the other hand there is only a small current flow, since the parasitic coupling capacitance in the pF range Hegt and thus limits current to values that no longer lead to the destruction of components.
- the capacitance of the capacitor is 5 to 500 nF.
- the signal transmitter is arranged near the transmitting / receiving component of the bus subscriber.
- the local reference potential corresponds to the common ground, but it can also be provided that the local reference potential corresponds to one pole of a supply voltage, since the poles of the supply voltage also have a fixed capacitive coupling to ground.
- a bus subscriber 101 is coupled by means of a signal transmitter 103 to a bus line 102.
- the bus subscriber 101 has a transmitting / receiving component 104, of which for simplicity only the receiving component is shown, and a local reference potential 106, in this example ground.
- the terminals 108, 109 namely the input terminals of the transmitting / receiving component 104 of the bus subscriber 101 are connected to a first winding of a signal transformer 103 and the two poles of a bus line 102 are connected to a second winding of this signal transformer.
- the first winding of the transformer 103 has a center tap 107, which is connected via a capacitor 105 to the reference potential 106.
- a direct coupling of the center tap 107 to the local reference potential 106 is for typical ElA-485 or EIA-422 compliant transmit / receive components 104 is not possible because the terminals 108 and 109 a DC voltage is superimposed.
- the signal transformer 103 is constructed with the bus driver 101 in a common housing or on a common printed circuit board, since it is advisable to arrange the transformer as close as possible to the transmitting / receiving component 104 in order to achieve as low a connection to the reference potential 106 as possible.
- the coupling circuit counteracts dynamic common-mode interference in the form of a potential difference between the bus subscriber 101 and the bus line 102 and the transmit / receive component 104 is protected against over-voltage at the terminals 108 and 109 against the local reference potential 106.
- the interference currents through the signal transformer winding run in opposite directions, whereby no magnetic field builds up.
- the transformer winding mainly the ohmic conductor resistances and only a small inductive resistance component by stray inductances or asymmetries in winding or current flow act.
- the measure of the achievable interference suppression is approximately calculated by the dividing ratio of the parasitic capacitance 110 of the transformer 103 and that of the capacitor 105 as follows: u Stör c
- Ustör interference voltage between bus subscriber 101 and bus line 102.
- C K parasitic capacitance 110.
- the parasitic capacitance of signal transducers is typically in the range of 10 pF to 50 pF. With a capacitance of the capacitor of e.g. 47nF calculated according to the above formula, a noise suppression of about 1000 to 5000. Practice has shown that the capacity should usefully at least 100 times the parasitic capacitance 110 of the transformer 103 should be. Conventional values of the capacitance of the capacitor 105 are between 5 to 500 nF.
- the DC-free, differentially transmitted useful signal is not subject to any additional Dämpf ung by the bypass capacitor 105, since no current flows through the capacitor 105 for differential signals.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Logic Circuits (AREA)
- Dc Digital Transmission (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11709311A EP2537258A1 (de) | 2010-02-17 | 2011-02-17 | Unterdrückung von überspannung verursacht durch indirekten blitzschlag |
JP2012553144A JP2013520111A (ja) | 2010-02-17 | 2011-02-17 | 誘導雷が原因の過電圧の抑制 |
US13/579,503 US20130049853A1 (en) | 2010-02-17 | 2011-02-17 | Suppression of overvoltage caused by an indirect lightning strike |
CN2011800101774A CN102934367A (zh) | 2010-02-17 | 2011-02-17 | 抑制间接雷击所致的过电压 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA239/2010A AT509840B1 (de) | 2010-02-17 | 2010-02-17 | Unterdrückung von überspannung verursacht durch indirekten blitzschlag |
ATA239/2010 | 2010-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011100775A1 true WO2011100775A1 (de) | 2011-08-25 |
Family
ID=44065549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2011/000082 WO2011100775A1 (de) | 2010-02-17 | 2011-02-17 | Unterdrückung von überspannung verursacht durch indirekten blitzschlag |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130049853A1 (de) |
EP (1) | EP2537258A1 (de) |
JP (1) | JP2013520111A (de) |
CN (1) | CN102934367A (de) |
AT (1) | AT509840B1 (de) |
WO (1) | WO2011100775A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011114527B4 (de) * | 2011-09-29 | 2014-05-15 | Eads Deutschland Gmbh | Bussystem |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
US20030154316A1 (en) * | 2002-02-14 | 2003-08-14 | The Boeing Company | System and associated suppression assembly for limiting electromagnetic emissions in network devices communicating via a network bus |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6400772B1 (en) * | 1998-06-16 | 2002-06-04 | Rc Networks | Line interface and method for detecting and eliminating an impedance mismatch between a transceiver and a transmission line |
US6870928B1 (en) * | 2001-05-25 | 2005-03-22 | Lsi Logic Corporation | Line interface, apparatus and method for coupling transceiver and transmission line |
GB0321658D0 (en) * | 2003-09-16 | 2003-10-15 | South Bank Univ Entpr Ltd | Bifilar transformer |
-
2010
- 2010-02-17 AT ATA239/2010A patent/AT509840B1/de not_active IP Right Cessation
-
2011
- 2011-02-17 US US13/579,503 patent/US20130049853A1/en not_active Abandoned
- 2011-02-17 EP EP11709311A patent/EP2537258A1/de not_active Withdrawn
- 2011-02-17 JP JP2012553144A patent/JP2013520111A/ja not_active Withdrawn
- 2011-02-17 WO PCT/AT2011/000082 patent/WO2011100775A1/de active Application Filing
- 2011-02-17 CN CN2011800101774A patent/CN102934367A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
US20030154316A1 (en) * | 2002-02-14 | 2003-08-14 | The Boeing Company | System and associated suppression assembly for limiting electromagnetic emissions in network devices communicating via a network bus |
Also Published As
Publication number | Publication date |
---|---|
AT509840A3 (de) | 2012-09-15 |
EP2537258A1 (de) | 2012-12-26 |
CN102934367A (zh) | 2013-02-13 |
US20130049853A1 (en) | 2013-02-28 |
AT509840B1 (de) | 2013-03-15 |
JP2013520111A (ja) | 2013-05-30 |
AT509840A2 (de) | 2011-11-15 |
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