EP2222137A1 - System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen - Google Patents

System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen Download PDF

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Publication number
EP2222137A1
EP2222137A1 EP09002228A EP09002228A EP2222137A1 EP 2222137 A1 EP2222137 A1 EP 2222137A1 EP 09002228 A EP09002228 A EP 09002228A EP 09002228 A EP09002228 A EP 09002228A EP 2222137 A1 EP2222137 A1 EP 2222137A1
Authority
EP
European Patent Office
Prior art keywords
driving circuit
signal lamp
driving
power supply
voltage
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
Application number
EP09002228A
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English (en)
French (fr)
Other versions
EP2222137B1 (de
Inventor
Robert Altermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales Security Solutions and Services GmbH
Original Assignee
Thales Security Solutions and Services GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thales Security Solutions and Services GmbH filed Critical Thales Security Solutions and Services GmbH
Priority to DE602009000291T priority Critical patent/DE602009000291D1/de
Priority to AT09002228T priority patent/ATE485703T1/de
Priority to EP09002228A priority patent/EP2222137B1/de
Publication of EP2222137A1 publication Critical patent/EP2222137A1/de
Application granted granted Critical
Publication of EP2222137B1 publication Critical patent/EP2222137B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/21—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults

Definitions

  • the invention relates to a driving circuit system for driving at least two DC signal lamps.
  • signal lamps are normally controlled via a two-wire circuit. For safety reasons these wires have to be supervised whether there is a short circuit to earth or between two wires to avoid the unintended lightening of a signal lamp.
  • a driving circuit system for driving at least two DC signal lamps comprising:
  • the above object is achieved, in accordance with the invention, by a method for detecting earth faults and interwire short circuits in the driving circuit system described above, wherein in a normal operation mode of the driving circuits, in which a signal lamp is turned on by connecting it to the positive and negative poles of the first power supply via the switches, an earth fault of a driving circuit is detected due to a leckage current measured by the central amperemeter, an interwire short circuit between wires of two driving circuits is detected due to a difference of the currents measured by the locals amperemeters of one of the two driving circuits, and an interwire short circuit between wires of one driving circuit is detected due to a comparison between the measured current and the expected current computed by both the measured voltage and the resistance of the wires and of the signal lamp.
  • a driving circuit system which supports automatic supervision and detection of earth faults and interwire short circuits within safety-critical systems using DC current for switching electrical devices.
  • the driving circuit system 1 for driving two DC signal lamps 2a, 2b comprises:
  • First power supply 3 is powerful enough to supply all signal lamps 2a, 2b simultaneously.
  • Second power supply 4 may to be less powerful because it has to supply one signal lamp only.
  • Power supply U E resulting from the different potentials can be very weak because it is used for earth fault detection only.
  • the central amperemeter 6 is placed between the two power supplies 3,4 to check earth faults. Periodical testing of the central amperemeter 6 is done by closing the switch S E .
  • the driving circuit system 1 specifies three voltages: U 1 and U 2 for signal lamp supply and U E for earth fault detection.
  • Each driving circuit 10a, 10b comprises:
  • Each signal lamp 2a, 2b is connected with the switches S 3 , S 4 by a two- wire cable, wherein the resistance of the signal lamp 2a, 2b is represented by R v and the resistance of one wire 11 is represented by R L .
  • the switches S 1 -S 4 can be implemented by relays or any semiconductor switch. The correct working of the switches S 1 -S 4 is checked by measuring the voltage V 1 -V 4 between the connections of the switches S 1 -S 4 and the occurrence of the expected current and is done by the control unit 17. All local amperemeters 13 and voltmeters 15 1 -154 are provided with low-pass filters (not shown). In addition to the diodes 16, further protective components (not shown) can be provided to avoid distortion caused by inductive load switching.
  • Each control unit 17 of the driving circuit 10a, 10b is controlled by the master control 7 and can be realized for example by a microcontroller.
  • Each control unit 17 supervises the voltages U A ,V 1 -V 4 and currents I E , I H , I R , actuates the switches S 1 -S 4 and defines the output voltage of the DC-DC converter 12.
  • the master control 7 commands a control unit 17 to switch on or off the signal lamp 2a, 2b, determines an operation mode of a control unit 17 and organizes the process of measurement of earth faults EF and interwire short circuits ISC. Errors which have been detected by control units 17 are reported to the master control 7 immediately.
  • the driving circuits 10a, 10b can be operated in a "normal operation mode" and a "test operation mode".
  • a signal lamp 2a, 2b is turned on by connecting it to the positive and negative poles of the first power supply 3 via the switches S 1 -S 4 . If a signal lamp 2a, 2b has to be turned on switches S 1 and S 2 are in position 1, SH is in position 1 and S R in position 2. If a signal lamp has to be turned off switches S EH and S ER are in position 1, switches S H and SR in position 2.
  • Interwire short circuits ISC between the two wires 11 of one driving circuits 10a, 10b can be deduced by measurement of U A and knowledge of I H and Rv and R L .
  • the expected value of I H can be calculated.
  • I H U A / (R v + 2 R L ).
  • a deviation is an evidence for the occurrence of a short circuit or a wire breaking.
  • R L of wire 11 may however alter depending on temperature influences R L can be measured in the test operation mode which is explained hereinafter.
  • RL has to be known for the detection.
  • the master control 7 regulates the permission of a driving circuit 10a, 10b to switch into the test operation mode. If a driving circuit 10a, 10b has finished the test master control 7 is informed accordingly.
  • driving circuit 10a If, for example, driving circuit 10a is in the test operation mode the switches S 1 , S 2 move into position 2 and the driving circuit 10a is connected to second power supply 4. If its signal lamp 2a was turned on it still remains turned on except for the short moment of alternating the power supply.
  • the electrical potential of the driving circuit 10a is below that of driving circuit 10b, i.e. of all other driving circuits. Any possible interwire short circuits ISC between this unit 10a and the others will lead to a leckage current I E .
  • the potential difference at least amounts to voltage U E .
  • the leakage current I E can be detected by calculating the difference of I H and I R if its signal lamp 2a is turned on. If signal lamp 2a is turned off, leakage current I E leads to values of I H and I R unequal to zero.
  • Switch S E is closed and I E must arise, otherwise a fault of switch SE, of amperemeter IE or ground connection must be supposed.

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP09002228A 2009-02-18 2009-02-18 System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen Expired - Fee Related EP2222137B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE602009000291T DE602009000291D1 (de) 2009-02-18 2009-02-18 System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen
AT09002228T ATE485703T1 (de) 2009-02-18 2009-02-18 System und verfahren zur automatischen und sicheren detektion von erdschlüssen und zwischenkabel-kurzschlüssen für gleichstromlampenschaltungen
EP09002228A EP2222137B1 (de) 2009-02-18 2009-02-18 System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09002228A EP2222137B1 (de) 2009-02-18 2009-02-18 System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen

Publications (2)

Publication Number Publication Date
EP2222137A1 true EP2222137A1 (de) 2010-08-25
EP2222137B1 EP2222137B1 (de) 2010-10-20

Family

ID=40910848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09002228A Expired - Fee Related EP2222137B1 (de) 2009-02-18 2009-02-18 System und Verfahren zur automatischen und sicheren Detektion von Erdschlüssen und Zwischenkabel-Kurzschlüssen für Gleichstromlampenschaltungen

Country Status (3)

Country Link
EP (1) EP2222137B1 (de)
AT (1) ATE485703T1 (de)
DE (1) DE602009000291D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015165769A1 (en) * 2014-05-01 2015-11-05 Koninklijke Philips N.V. A safety protection arrangement for a lighting arrangement.
EP3465868A4 (de) * 2016-06-02 2019-12-04 Eaton Intelligent Power Limited Redundante stromversorgung und steuerung von leuchten

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070159750A1 (en) * 2006-01-09 2007-07-12 Powerdsine, Ltd. Fault Detection Mechanism for LED Backlighting
US20080231198A1 (en) * 2007-03-23 2008-09-25 Zarr Richard F Circuit for driving and monitoring an LED
US20080238344A1 (en) 2007-03-29 2008-10-02 Koito Manufacturing Co., Ltd. Light Emitting Apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070159750A1 (en) * 2006-01-09 2007-07-12 Powerdsine, Ltd. Fault Detection Mechanism for LED Backlighting
US20080231198A1 (en) * 2007-03-23 2008-09-25 Zarr Richard F Circuit for driving and monitoring an LED
US20080238344A1 (en) 2007-03-29 2008-10-02 Koito Manufacturing Co., Ltd. Light Emitting Apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015165769A1 (en) * 2014-05-01 2015-11-05 Koninklijke Philips N.V. A safety protection arrangement for a lighting arrangement.
CN106256171A (zh) * 2014-05-01 2016-12-21 皇家飞利浦有限公司 用于照明安排的安全保护安排
US9756700B2 (en) 2014-05-01 2017-09-05 Koninklijke Philips N.V. Safety protection arrangement for a lighting arrangement
CN106256171B (zh) * 2014-05-01 2018-10-12 皇家飞利浦有限公司 用于照明安排的安全保护安排
EP3465868A4 (de) * 2016-06-02 2019-12-04 Eaton Intelligent Power Limited Redundante stromversorgung und steuerung von leuchten

Also Published As

Publication number Publication date
DE602009000291D1 (de) 2010-12-02
ATE485703T1 (de) 2010-11-15
EP2222137B1 (de) 2010-10-20

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