EP0822907A1 - Cellule pour entrees alternatives destinees a des circuits d'acquisition d'informations - Google Patents
Cellule pour entrees alternatives destinees a des circuits d'acquisition d'informationsInfo
- Publication number
- EP0822907A1 EP0822907A1 EP96908937A EP96908937A EP0822907A1 EP 0822907 A1 EP0822907 A1 EP 0822907A1 EP 96908937 A EP96908937 A EP 96908937A EP 96908937 A EP96908937 A EP 96908937A EP 0822907 A1 EP0822907 A1 EP 0822907A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elements
- chain
- cell
- voltage
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
- 230000008901 benefit Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/16—Security signalling or alarm systems, e.g. redundant systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
Definitions
- the present invention relates essentially to a cell for alternative inputs intended for information acquisition circuits, and more particularly in the railway environment. Technological back-pian.
- the cells for alternative inputs intended for information acquisition circuits essentially consist of mechanical safety relays which are connected together by simple cabling.
- the present invention aims to propose a cell for alternative inputs intended for information acquisition circuits, and in particular in the rail sector, which exhibits behavior at least equivalent in terms of safety than that of the state of the technique while retaining its own advantages, which are a reduced size, greater ease of maintenance and adaptation as well as a longer service life. More particularly, the present invention aims to propose a cell where the reading by error is always carried out in the direction of security.
- the present invention also aims to detect failures which could occur in the various constituent elements of the cell.
- the present invention also aims to minimize the influence of the variation in the characteristics of the components used under the effect of an external factor such as a rise in temperature, for example.
- the present invention relates to a cell for alternative inputs intended for information acquisition circuits, comprising at least one device for detecting a voltage greater than the reference for positive alternation at the input voltage, and a device for detecting a voltage greater than the reference for the negative alternation of the input voltage.
- Each of these detection devices comprises a zener diode, an optocoupler comprising an emission LED, a diode and a resistor, these elements being arranged in series.
- the elements constituting each of the two detection devices mentioned above are arranged on a branch, the two branches being arranged in parallel.
- the elements constituting the detection device for negative alternation are arranged in reverse arrangement with respect to those constituting the detection device for positive alternation.
- the two detection devices are arranged in series on the same branch.
- the elements constituting the detection device for negative alternation are mounted in reverse assembly compared to those constituting the detection device for positive alternation.
- a resistor is arranged in parallel on each of the optocouplers, so as to limit the influence of the leakage current of the zener diodes.
- Figures 1 and 2 show block diagrams which show the essential elements constituting a device according to the present invention.
- FIG. 3 represents an embodiment of the device according to the present invention in practice by applying the principles described in FIGS. 1 and 2. Description of several preferred embodiments of the invention.
- FIGS. 1 and 2 where the main characteristic elements are repeated.
- the device according to the present invention commonly called cell for alternative inputs for information acquisition circuits, as shown in the figure
- branches A and B are essentially composed of two branches called branches A and B, which respectively comprise a device for detecting a voltage greater than the reference for positive alternation at the input voltage (branch A) and a device for detecting '' a voltage higher than the reference for the negative alternation of the input voltage
- the voltage threshold is achieved by measuring the time during which, during a alternating, the input voltage is higher than the reference voltage. If this time is greater than the predefined limit time, then it is considered that the input voltage is sufficient; otherwise, it is considered that there is not sufficient voltage at the input.
- the branches A and B comprise the same elements, but arranged in a reverse arrangement.
- the branch A which constitutes the detection device for positive alternation, comprises a zener diode DZl, an optocoupler Ul, a diode D2 and a resistor RI, these elements being arranged in series; while the branch B which constitutes the detection device for negative alternation comprises a zener diode DZ2, an optocopleur U2, a diode D4 and a resistor R3, also arranged in series but in a reverse arrangement.
- the main drawback of this arrangement described in FIG. 2 lies in the fact that the zener diodes DZl and DZ2 can have a particularly large leakage current which increases with temperature.
- FIG. 3 describes a practical example of a device according to the present invention, using the principles described in FIG. 2.
- the device described in FIG. 3 is a 110 volt - 50 Hertz alternative input cell essentially comprising 3 functional blocks arranged in cascade.
- the first block (block I) essentially limits overvoltages.
- the second block (block II) guarantees the power consumption of the input.
- the third block (block III) achieves the cell voltage threshold, as well as the galvanic isolation between the input and the output processing chains.
- Block I consists of a varistor VR1, a resistor R5, diodes and spark gaps in order to protect the cell against overvoltages, while block II which ensures the minimum nominal consumption (reactive power) consists of a capacity " 4 terminals "C4 coupling the cell input terminals to block III which itself provides the voltage threshold.
- the varistor VR1 clips the overvoltages appearing during differential discharges, while the resistor R5 limits the amplitude of the current peaks in the "4-terminal" capacity C4 during the discharges, as well as the dV / dt.
- the "4-terminal" capacity C4 must be determined so as to guarantee a minimum consumption for a given input voltage of 50 Hertz.
- the device for detecting a voltage greater than the reference for the positive alternation of the input voltage, which is located on branch A essentially consists of the elements described in Figures 1 and 2: the zener diode DZl, l optocoupler Ul, diode D2 and resistance RI, while the device for detecting a voltage greater than the reference for the negative alternation of the input voltage, which is located on branch B, is essentially consisting of the same elements as those described in FIGS. 1 and 2: the zener diode DZ2, 1 Optocoupler U2, the diode D4 and the resistor R3.
- a fuse FI or F2 is present in each of the branches A or B.
- the main selection criterion for the two main optocouplers Ul and U2 is to operate with the lowest possible LED current, in order to dissipate a minimum of power in the series resistors RI and R3. This also makes it possible to minimize the contribution of the characteristic of the emission LED in the value of the voltage threshold.
- the conduction time of the optocouplers Ul and U2 is measured by sampling 32 times at regular intervals of 20 milliseconds (therefore corresponding to a frequency of 50 Hertz), the electrical level supplied to the output processing chains and by counting the number of 'samples for which there is a logical state "0".
- the emission LED of Ul emits during all the time when the input voltage is higher than the threshold voltage of branch A.
- the emission of this LED of 1 Optocoupler Ul is materialized by the grounding of the resistors R2 , R9 and RIO arranged in "Pull Up" on 1 Optocoupler Ul, thus leading to the blocking of Ql and the reading of a logic level "0" on the input of the multiplexer scanned by the processing chain A (transmitter Ql).
- the emission LED of U2 transmits during all the time when the input voltage is higher than the threshold voltage of branch B.
- the emission of this LED from the optocoupler U2 is materialized by the grounding of the resistors R4,
- the processing chain A scans the voltage on the transmitter Ql, while the chain B is connected to the collector of the output transistor of the optocoupler U2.
- a and B exchange their own value for the purpose of mutual verification on the number of samples taken while Ul or U2 were conductive.
- the signals useful for the cell output occur naturally on the collectors of the output optocouplers with a high output impedance level for the electrical state "1" and a low impedance level for the electrical state "0 ".
- This characteristic presents the risk of being able to carry out on the two processing chains a logical "OR" function (from the point of view of the state of the inputs) in the event of faults consisting of the appearance of a short circuit between the output signals. of different cells.
- This buffer stage consists of the transistor Ql and the resistor R6 placed in the processing chain A.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Electronic Switches (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96908937A EP0822907B1 (fr) | 1995-04-19 | 1996-04-12 | Cellule d'entrees alternatives destinee a des circuits d'acquisition d'informations |
ES96908937T ES2143756T3 (es) | 1995-04-19 | 1996-04-12 | Celula de entradas alternas destinada a unos circuitos de adquisicion de informaciones. |
GR20000400744T GR3033056T3 (en) | 1995-04-19 | 2000-03-24 | Ac input cell for data acquisition circuits |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95870039 | 1995-04-19 | ||
EP95870039 | 1995-04-19 | ||
EP96908937A EP0822907B1 (fr) | 1995-04-19 | 1996-04-12 | Cellule d'entrees alternatives destinee a des circuits d'acquisition d'informations |
PCT/BE1996/000040 WO1996033086A1 (fr) | 1995-04-19 | 1996-04-12 | Cellule pour entrees alternatives destinees a des circuits d'acquisition d'informations |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0822907A1 true EP0822907A1 (fr) | 1998-02-11 |
EP0822907B1 EP0822907B1 (fr) | 2000-02-02 |
Family
ID=8222128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96908937A Expired - Lifetime EP0822907B1 (fr) | 1995-04-19 | 1996-04-12 | Cellule d'entrees alternatives destinee a des circuits d'acquisition d'informations |
Country Status (21)
Country | Link |
---|---|
US (1) | US6229349B1 (fr) |
EP (1) | EP0822907B1 (fr) |
JP (1) | JPH11504587A (fr) |
KR (1) | KR100403087B1 (fr) |
CN (1) | CN1182393A (fr) |
AP (1) | AP820A (fr) |
AT (1) | ATE189430T1 (fr) |
AU (1) | AU713905B2 (fr) |
CA (1) | CA2218502A1 (fr) |
CZ (1) | CZ289720B6 (fr) |
DE (1) | DE69606527T2 (fr) |
DK (1) | DK0822907T3 (fr) |
EA (1) | EA000206B1 (fr) |
ES (1) | ES2143756T3 (fr) |
GR (1) | GR3033056T3 (fr) |
HU (1) | HUP9802642A3 (fr) |
OA (1) | OA10527A (fr) |
PL (1) | PL180737B1 (fr) |
PT (1) | PT822907E (fr) |
SK (1) | SK283834B6 (fr) |
WO (1) | WO1996033086A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2763184B1 (fr) * | 1997-05-07 | 1999-07-23 | Csee Transport | Dispositif de validation de messages numeriques, applicable notamment aux systemes de regulation du trafic ferroviaire |
FR2798538B1 (fr) * | 1999-09-10 | 2001-12-14 | Soprano | Circuit logique d'entree sans dissipation thermique et adaptable en tension |
DE10329655A1 (de) * | 2003-07-01 | 2005-02-03 | Infineon Technologies Ag | Elektronisches Bauelement |
US7808892B1 (en) * | 2006-11-21 | 2010-10-05 | Meteorcomm, Llc | Redundant data distribution systems and methods |
US8674681B2 (en) * | 2010-05-25 | 2014-03-18 | Rockwell Automation Technologies, Inc. | Voltage detection and measurement circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4091292A (en) * | 1977-03-07 | 1978-05-23 | General Signal Corporation | Fail-safe monitor of d.c. voltage |
FR2569916B1 (fr) * | 1984-09-03 | 1986-09-26 | Charbonnages De France | Circuit de puissance et dispositif de declenchement le comportant |
GB2166918B (en) * | 1984-11-13 | 1988-09-14 | Westinghouse Brake & Signal | A circuit arrangement for providing in a fail-safe manner an alternating output signal to a load |
AUPM744794A0 (en) * | 1994-08-15 | 1994-09-08 | Garrick, Gilbert Alain Lindsay | Smoke alarm system with standby battery and elv reactive primary power supply |
-
1996
- 1996-04-12 PT PT96908937T patent/PT822907E/pt unknown
- 1996-04-12 DE DE69606527T patent/DE69606527T2/de not_active Expired - Lifetime
- 1996-04-12 HU HU9802642A patent/HUP9802642A3/hu unknown
- 1996-04-12 AT AT96908937T patent/ATE189430T1/de active
- 1996-04-12 SK SK1415-97A patent/SK283834B6/sk not_active IP Right Cessation
- 1996-04-12 EP EP96908937A patent/EP0822907B1/fr not_active Expired - Lifetime
- 1996-04-12 KR KR1019970707288A patent/KR100403087B1/ko not_active IP Right Cessation
- 1996-04-12 CZ CZ19973220A patent/CZ289720B6/cs not_active IP Right Cessation
- 1996-04-12 JP JP8531361A patent/JPH11504587A/ja active Pending
- 1996-04-12 AU AU52626/96A patent/AU713905B2/en not_active Expired
- 1996-04-12 CA CA002218502A patent/CA2218502A1/fr not_active Abandoned
- 1996-04-12 AP APAP/P/1997/001071A patent/AP820A/en active
- 1996-04-12 EA EA199700237A patent/EA000206B1/ru not_active IP Right Cessation
- 1996-04-12 WO PCT/BE1996/000040 patent/WO1996033086A1/fr active IP Right Grant
- 1996-04-12 PL PL96323041A patent/PL180737B1/pl unknown
- 1996-04-12 ES ES96908937T patent/ES2143756T3/es not_active Expired - Lifetime
- 1996-04-12 US US08/952,362 patent/US6229349B1/en not_active Expired - Fee Related
- 1996-04-12 DK DK96908937T patent/DK0822907T3/da active
- 1996-04-12 CN CN96193384A patent/CN1182393A/zh active Pending
-
1997
- 1997-10-17 OA OA70110A patent/OA10527A/fr unknown
-
2000
- 2000-03-24 GR GR20000400744T patent/GR3033056T3/el unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9633086A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1182393A (zh) | 1998-05-20 |
WO1996033086A1 (fr) | 1996-10-24 |
OA10527A (fr) | 2002-04-29 |
AU5262696A (en) | 1996-11-07 |
CZ289720B6 (cs) | 2002-03-13 |
PL180737B1 (en) | 2001-03-30 |
KR19980703887A (ko) | 1998-12-05 |
EA000206B1 (ru) | 1998-12-24 |
JPH11504587A (ja) | 1999-04-27 |
AU713905B2 (en) | 1999-12-16 |
DE69606527D1 (de) | 2000-03-09 |
PT822907E (pt) | 2000-07-31 |
ES2143756T3 (es) | 2000-05-16 |
ATE189430T1 (de) | 2000-02-15 |
CZ322097A3 (cs) | 1998-01-14 |
EP0822907B1 (fr) | 2000-02-02 |
GR3033056T3 (en) | 2000-08-31 |
CA2218502A1 (fr) | 1996-10-24 |
HUP9802642A3 (en) | 1999-08-30 |
KR100403087B1 (ko) | 2004-02-11 |
EA199700237A1 (ru) | 1998-02-26 |
DK0822907T3 (da) | 2000-07-24 |
DE69606527T2 (de) | 2000-08-17 |
US6229349B1 (en) | 2001-05-08 |
AP820A (en) | 2000-04-20 |
SK283834B6 (sk) | 2004-03-02 |
PL323041A1 (en) | 1998-03-02 |
HUP9802642A2 (hu) | 1999-03-29 |
SK141597A3 (en) | 1998-06-03 |
AP9701071A0 (en) | 1997-10-31 |
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