WO2008098303A1 - Suppresseur de tension induite destiné à un usage dans un régulateur de signalisation de flux de circulation - Google Patents

Suppresseur de tension induite destiné à un usage dans un régulateur de signalisation de flux de circulation Download PDF

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Publication number
WO2008098303A1
WO2008098303A1 PCT/AU2008/000197 AU2008000197W WO2008098303A1 WO 2008098303 A1 WO2008098303 A1 WO 2008098303A1 AU 2008000197 W AU2008000197 W AU 2008000197W WO 2008098303 A1 WO2008098303 A1 WO 2008098303A1
Authority
WO
WIPO (PCT)
Prior art keywords
induced voltage
load
voltage
resistor
switching element
Prior art date
Application number
PCT/AU2008/000197
Other languages
English (en)
Inventor
Malcolm Young
Original Assignee
Aldridge Traffic Controllers Pty Ltd
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
Priority claimed from AU2007900871A external-priority patent/AU2007900871A0/en
Application filed by Aldridge Traffic Controllers Pty Ltd filed Critical Aldridge Traffic Controllers Pty Ltd
Priority to AU2008215174A priority Critical patent/AU2008215174B2/en
Priority to CN2008800053228A priority patent/CN101669154B/zh
Priority to NZ579581A priority patent/NZ579581A/en
Publication of WO2008098303A1 publication Critical patent/WO2008098303A1/fr
Priority to HK10108244.5A priority patent/HK1141891A1/xx

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals

Definitions

  • the present invention relates to an induced voltage suppressor for use in a traffic signal controller.
  • the invention relates to an apparatus and a method for switching the output of a traffic signal controller to prevent voltage on wires to and from the controller undesirably affecting the voltage in nearby supply wires that power LED traffic lights operated by the controller.
  • the load capacitor forms a capacitive voltage divider with the wire capacitance and can thus reduce the undesired voltage by the ratio of these capacitances.
  • This method is flawed in that some traffic control systems use lights connected via transformers.
  • the transformer inductance may disadvantageously resonate with the capacitance of the wire and the load capacitor to neutralise the beneficial effect of the load capacitor.
  • the obvious solution to this is to use a resistor in place of the load capacitor.
  • the resistor would, in normal use, become undesirably hot as it has the full mains voltage applied to it while ever the light is lit.
  • an induced voltage suppression device for use in a traffic signal controller, and located along a lamp drive circuit of a traffic light, the device comprising a low impedance element and an independently controllable switching element able to disconnect the low impedance element from the circuit at any time.
  • the low impedance element has a resistance that depends on applied voltage such that the power dissipated by the low impedance element does not exceed a predetermined level with any applied voltage in a normal operating range of the lamp drive circuit. It is preferred that the low impedance element is a resistor that has a positive temperature coefficient of resistance sufficient to permit the full voltage of the lamp drive circuit to be applied to the resistor without causing permanent damage to the resistor. In a preferred form, the switching element is controlled so as to be switched on when the traffic light is switched off.
  • the switching element is preferably controlled so as to be switched off when a measured voltage on the traffic light exceeds a predetermined level. It is preferred that the induced voltage suppressor is connected to a means for measuring power, current or voltage, wherein such measurements are made with the switching element on and with the switching element off, thereby allowing a check that the measuring means is functional.
  • the induced voltage suppressor is preferably connected to a means for measuring power, current or voltage, wherein such measurements are made with the switching element on and with the switching element off, thereby allowing an estimate of the impedance of a load by recognising that a high impedance load is significantly affected by the switching operation and a low impedance load is only slightly affected by the switching operation in the measured power, current or voltage of the load.
  • an induced voltage suppressor for use in a traffic signal controller, the induced voltage suppressor located along a lamp drive circuit and comprising a traffic light load switch, a load resistor having a low impedance for reducing an induced voltage along the drive circuit, and a low power switch for allowing the load resistor to be disconnected from the lamp drive circuit when the traffic light load switch is in the off position.
  • the traffic light load switch is a triac. It is preferred that the load resistor has a sufficiently positive temperature coefficient of resistance, such that, if full mains voltage is applied to the load resistor as a result of a fault, the natural heating of the load resistor will increase its resistance and thus limit further heating.
  • Fig. 1 is a block diagram of a second preferred embodiment of the invention.
  • the induced voltage suppressor Operating in a traffic signal controller is an induced voltage suppressor which is located along a lamp drive circuit.
  • the induced voltage suppressor consists of a conventional traffic light load switch, typically a triac, together with a load resistor sufficiently low in impedance to reduce the induced voltage to a low level and with an additional low power switch to allow the load resistor to be disconnected from the circuit when the main traffic light load switch is operated.
  • the load resistor in this embodiment, has a high positive temperature coefficient of resistance such that if full mains voltage is applied to the load resistor by some wiring or control fault, the natural heating of the load resistor will increase its resistance, thus limiting further heating.
  • Such resistors are commonly available and known as PTC thermistors. Connection of the load resistor to the output of the traffic light load switch occurs either automatically, whenever the load switch is in the off condition, or when instructed to do so by a traffic controller microprocessor.
  • the load resistor has the additional characteristic of intrinsic current limiting by means of a positive temperature coefficient of resistance in part or all of the load sensor.
  • This first embodiment of the invention also has voltage measure capability, whereby measuring the voltage with the load resistor in circuit and out of circuit can allow an estimation of the impedance of the load to be made. Furthermore, power measurement is another capability of this embodiment of the invention. By measuring the load power with the load resistor in circuit and out of circuit, it is possible to confirm the proper functioning and calibration of the load switch power measurement capability.
  • FIG. 1 A second embodiment of the invention is shown in Fig. 1.
  • a microcomputer 10 is connected to controllable switching element 12 via connection means 14, thus allowing PTC thermistor 16 to conduct current from the triac 18 to the common mains neutral conductor 2O.
  • There is an optional resistor 22 which, although not essential to the invention, is often useful to set a maximum current limit when switching element 12 is turned on.
  • the power is fed to the circuit 24 and the output from the circuit 24 to the traffic lantern (not shown) is connected at 25.
  • a protective fuse 26 which, although not essential to the invention, may be useful.
  • the microcomputer 10 controls the triac 18 via an interface arrangement 28 and monitors the operation by measuring arrangement 30 which measures the current using current sensing resistor 32 connected by connection means 34, 36 and measures the voltage connected by connection means 38, 40.
  • the PTC thermistor 16 could be part no 2322-660- 51993 made by the BC components company. This thermistor has a resistance of about 1200 ohms when cold and will heat to a temperature of about 140 degrees C when full mains voltage is applied. Resistor 22 could be chosen to have a resistance of about 1200 ohms. When combined with the cold resistance of thermistor 16, the maximum cold current through the resistor 22, thermistor 16, and switching element 12 is set to a convenient value of about 100mA.
  • the switching element 12 can conveniently be a triac driver type
  • the triac 18 could be type MAC16M made by the ON semiconductor company.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention se rapporte à un dispositif de suppression de tension induite destiné à un usage dans un régulateur de signalisation de flux de circulation, qui est placé dans un circuit de commande de feux (24) d'un feu de circulation. Le dispositif comprend un élément à faible impédance (16) et un élément de commutation (12) contrôlable de manière indépendante qui est apte à déconnecter l'élément à faible impédance du circuit à tout moment.
PCT/AU2008/000197 2007-02-16 2008-02-18 Suppresseur de tension induite destiné à un usage dans un régulateur de signalisation de flux de circulation WO2008098303A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2008215174A AU2008215174B2 (en) 2007-02-16 2008-02-18 Induced voltage suppressor for use in a traffic signal controller
CN2008800053228A CN101669154B (zh) 2007-02-16 2008-02-18 用于交通信号控制器的感应电压抑制器
NZ579581A NZ579581A (en) 2007-02-16 2008-02-18 Induced voltage suppressor for use in a traffic signal controller
HK10108244.5A HK1141891A1 (en) 2007-02-16 2010-08-31 Induced voltage suppressor for use in a traffic signal controller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007900871A AU2007900871A0 (en) 2007-02-16 Induced voltage suppressor for use in a traffic signal controller
AU2007900871 2007-02-16

Publications (1)

Publication Number Publication Date
WO2008098303A1 true WO2008098303A1 (fr) 2008-08-21

Family

ID=39689555

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000197 WO2008098303A1 (fr) 2007-02-16 2008-02-18 Suppresseur de tension induite destiné à un usage dans un régulateur de signalisation de flux de circulation

Country Status (5)

Country Link
CN (1) CN101669154B (fr)
AU (1) AU2008215174B2 (fr)
HK (1) HK1141891A1 (fr)
NZ (1) NZ579581A (fr)
WO (1) WO2008098303A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230956A (zh) * 2011-06-21 2011-11-02 天津市顺通电子有限公司 工频市电灯组通断实时检测方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103457224B (zh) * 2013-09-06 2016-01-20 国家电网公司 一种基于阻抗调整的输电线路感应电压抑制装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698721A (en) * 1983-11-07 1987-10-06 Puroflow Corp. Power line filter for transient and continuous noise suppression
US20070075147A1 (en) * 2005-09-30 2007-04-05 Stmicroelectronics Asia Pacific Pte. Ltd. Circuits for preventing overvoltage conditions on antenna terminals and method
JP2008020583A (ja) * 2006-07-12 2008-01-31 Meidensha Corp Ｌｅｄ表示器の制御回路

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1566922B2 (de) * 1967-01-24 1976-03-25 Signalbau-Huber München KG, 8000 München Schaltungsanordnung zur ueberwachung der betriebsfaehigkeit eines gluehfadens in einer gluehlampe
US6072406A (en) * 1997-07-30 2000-06-06 Leonard; William H. Traffic light control apparatus for emergency vehicles
DE10237983A1 (de) * 2002-08-14 2004-03-04 Kurz, Gerhard Vorrichtung zur Leistungssteuerung durch Phasenanschnitt und Verfahren zur Verringerung von Oberwellen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698721A (en) * 1983-11-07 1987-10-06 Puroflow Corp. Power line filter for transient and continuous noise suppression
US20070075147A1 (en) * 2005-09-30 2007-04-05 Stmicroelectronics Asia Pacific Pte. Ltd. Circuits for preventing overvoltage conditions on antenna terminals and method
JP2008020583A (ja) * 2006-07-12 2008-01-31 Meidensha Corp Ｌｅｄ表示器の制御回路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230956A (zh) * 2011-06-21 2011-11-02 天津市顺通电子有限公司 工频市电灯组通断实时检测方法

Also Published As

Publication number Publication date
AU2008215174A1 (en) 2008-08-21
HK1141891A1 (en) 2010-11-19
CN101669154B (zh) 2012-07-18
AU2008215174B2 (en) 2012-02-02
NZ579581A (en) 2011-05-27
CN101669154A (zh) 2010-03-10

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