EP1523795A1 - Circuit de protection de capteur - Google Patents

Circuit de protection de capteur

Info

Publication number
EP1523795A1
EP1523795A1 EP03787619A EP03787619A EP1523795A1 EP 1523795 A1 EP1523795 A1 EP 1523795A1 EP 03787619 A EP03787619 A EP 03787619A EP 03787619 A EP03787619 A EP 03787619A EP 1523795 A1 EP1523795 A1 EP 1523795A1
Authority
EP
European Patent Office
Prior art keywords
sensor
line
circuit
protection circuit
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.)
Withdrawn
Application number
EP03787619A
Other languages
German (de)
English (en)
Inventor
Thomas Maier
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1523795A1 publication Critical patent/EP1523795A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems

Definitions

  • the invention relates to a sensor protection circuit, in particular for a vehicle electrical system, according to the preamble of claim 1.
  • Numerous sensors are usually used in modern motor vehicles in order to detect the state of the motor vehicle or the surroundings.
  • the sensors can be powered by separate supply lines that are separated from the vehicle electrical system. This offers the advantage that the sensor query is not disturbed by the generally higher load currents of the vehicle electrical system.
  • Protective circuits of the sensors can consist, for example, of Zener diodes or capacitors.
  • the invention is therefore based on the object of making it possible to use known sensors with a short-circuit strength up to a voltage of 12 V in a modern motor vehicle electrical system with a voltage of 42 V without the risk of damage to the sensors in the event of a short circuit ,
  • the invention encompasses the general technical teaching, a
  • Use sensor protection circuit that detects the current rise on the supply line in the event of a short-circuit of a supply line for a sensor and thereby enables the initiation of suitable countermeasures.
  • the sensor's overvoltage protection takes effect. Thanks to fast fault detection and the quick initiation of countermeasures, sensors with a short-circuit strength below the nominal voltage of the vehicle electrical system can be used.
  • the countermeasure in the event of a short circuit can be that the supply line for the sensors is separated by a switching element, which prevents a further increase in current.
  • the supply line for the sensors can be separated either with one pole for the ground line or the voltage line or with two poles for the ground line and the voltage line, preferably using a switching element which is connected in series with a supply line.
  • the switching element for separating the supply line for the sensors can also be controlled externally independently of the current on the supply line, for which purpose the sensor protection circuit preferably has a separate control input.
  • This separate shutdown can be software-controlled, for example, if a short circuit continues for a predetermined period of time.
  • the current measurement on the supply line for the sensors is preferably carried out on the ground line, but in principle it is also possible for the current to be measured on the voltage line of the sensors.
  • the sensor protection circuit according to the invention preferably also has a passive protective circuit in order to prevent damage to the sensors in the event of a short circuit.
  • Such a protective circuit can consist, for example, of capacitors or Zener diodes, these components te can be connected between the two supply lines for the sensors.
  • the components of the passive protective circuit may connect the ground line and / or the voltage line of the sensors to ground.
  • Zener diodes when using Zener diodes as passive protective circuitry, it is advantageous if the Zener diodes in the sensor protective circuit according to the invention have a lower breakdown voltage than the Zener diodes which are usually provided in the sensors as protective circuitry. This is advantageous because after a short transient phase, the short-circuit current then flows exclusively via the Zener diodes in the sensor protection circuit and no longer via the Zener diodes in the sensors, so that the Zener diodes in the sensors only transmit the short-circuit current for one have to wear for a very short period of time.
  • sensor used in the context of the invention is to be understood in general terms and includes all components that are supplied with electricity and supply a measured variable. Lambda sensors, temperature sensors, pressure sensors, inclination sensors and acceleration sensors are only examples here.
  • the invention is also not limited to use in future automotive electrical systems with a mains voltage of 42V. Rather, it is also possible for on-board networks with other mains voltages to be developed on the basis of corresponding standardization, in which the sensor protection circuit according to the invention can also be used.
  • FIG. 1 shows a sensor protection circuit according to the invention with a sensor in the form of a circuit diagram
  • FIG. 2 shows a current limiter circuit of the sensor protection circuit from FIG. 1.
  • FIG. 1 shows a sensor protection circuit 1 according to the invention, which is used in a motor vehicle electrical system with a line voltage of 42 V in order to be able to operate a conventional sensor unit 2 with a short-circuit resistance of 12 V without the sensor unit 2 in the Damaged or even destroyed in the event of a short circuit.
  • the sensor unit 2 is shown in FIG. 1, but a plurality of sensor units can also be operated on the sensor protection circuit 1, as indicated by the dashed lines.
  • the sensor protection circuit 1 has a ground line 3 and a voltage line 4 for supplying power to the sensor unit 2, the voltage line 4 being connected on the input side to a voltage regulator 5 which regulates the voltage on the voltage line 4 to the operating voltage of the sensor unit 2, which is 5 V in this embodiment.
  • the ground line 3 is connected to ground on the input side, a buffer capacitor C1 being arranged at the input of the sensor protection circuit 1 between the voltage line 4 and the ground line 3.
  • the sensor unit 2 consists of the actual sensor 6, which measures a physical state variable, such as temperature, pressure or the air ratio ⁇ , and outputs a corresponding measurement signal via a signal line 7.
  • a physical state variable such as temperature, pressure or the air ratio ⁇
  • the sensor unit 2 has a passive protective circuit to prevent damage in the event of a short circuit. Prevent damage to the sensor 6, the passive protective circuit of the sensor unit 2 is designed for the previously common vehicle electrical system voltage of 12 V.
  • the Zener diode Dl is therefore connected between the signal line 7 and the ground line 3.
  • the Zener diode D2 is therefore connected between the voltage line 4 and the ground line 3.
  • the passive protective circuit of the sensor unit 2 only offers a short-circuit strength compared to the previously usual on-board electrical system voltage of 12 V, whereas the passive protective circuit of the sensor unit 2 is overwhelmed when used in a modern motor vehicle electrical system with a voltage of 42 V alone.
  • the sensor protection circuit 1 therefore has a current limiter 8, which is arranged in the ground line 3 for the sensor unit 2 and measures the current via the ground line 3, the current limiter 8 being shown in detail in FIG. 2 and described below.
  • the current limiter 8 has a measuring resistor Rl, which is arranged in the ground line 3, so that the voltage drop across the measuring resistor Rl reflects the current flowing through the ground line 3.
  • a MOSFET transistor T1 is arranged in the ground line 3, which, depending on its control, enables both a current limitation and a complete separation of the ground line 3 in the event of a short circuit.
  • the gate connection of the MOSFET transistor T1 is connected to the output of a comparator circuit which consists of two resistors R3, R4 and two transistors T2 and T3.
  • the comparator circuit is connected on the input side to the measuring resistor R1 and thus detects the via
  • the comparator circuit controls the gate connection of the MOSFET transistor T1 in dependence on the electrical current flowing via the ground line 3 in such a way that the current is limited in order to damage the sensor 6 in the event of a short circuit prevent.
  • the current limiter 8 also has a transistor T4 which connects the gate connection of the MOSFET transistor Tl to ground, so that the MOSFET transistor Tl disconnects the ground line 3 when the transistor T4 turns on, since the potential of the gate connection of the MOSFET transistor T1 is then pulled to ground.
  • the control of the transistor T4 takes place via a separate control input 9 and two intermediate resistors R5, R6 by means of a software control which separates the MOSFET transistor Tl when the short-circuit case lasts for a predetermined period of time.
  • the sensor protection circuit 1 to protect the sensor 6 also has a passive protective circuit, which consists of two Zener diodes D3, D4 and three capacitors C2, C3 and C4.
  • the Zener diode D3 is connected between the signal line 7 and the ground line 3 and prevents an overload on the output side of the sensor 6 in the event of a short circuit between the on-board electrical system voltage of 42 V and the signal line 7.
  • the Zener diode D4 is connected between the voltage line 4 and the ground line 3 and prevents an overload on the input side of the sensor 6 in the event of a short circuit between the vehicle electrical system voltage of 42 V and the voltage line 4.
  • the capacitor C2 is connected between the signal line 7 and ground and thus buffers EMC voltage peaks on the signal line 7, which likewise counteracts an overload on the output side of the sensor 6.
  • the capacitor C3, connects the voltage line 4 to the ground line 3 and thus buffers voltage fluctuations at the input of the sensor unit 2 and takes over the current.
  • the capacitor C4 connects the ground line 3 to ground, as a result of which EMC fluctuations in the ground potential on the ground line 3 are suppressed.
  • the passive protective circuit of the sensor protective circuit 1 therefore takes over the short-circuit current from the passive protective circuit of the sensor unit 2, thereby preventing the passive protective circuit of the sensor unit 2 from being overloaded.
  • the current limiter 8 then limits the short-circuit current on the ground line 8 in order to prevent overloading the passive protective circuit of the sensor protective circuit 1. In the event of a persistent short circuit, the control input 9 of the current limiter 8 is then triggered, whereupon the MOSFET transistor T1 completely disconnects the ground line 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

La présente invention concerne un circuit de protection de capteur pour au moins un capteur (6), notamment dans le réseau de bord d'une automobile, qui comprend au moins une conduite d'alimentation (3, 4) conçue pour assurer l'alimentation en courant du capteur (6), ainsi qu'une unité de mesure de courant (8) conçue pour détecter le courant électrique qui passe sur la conduite d'alimentation (3), afin d'éviter qu'une surtension n'endommage le capteur (6). Ladite unité de mesure de courant (8) est reliée à un limiteur de courant ou à un élément de commutation, afin de limiter le courant ou de déconnecter la conduite d'alimentation (3).
EP03787619A 2002-07-19 2003-07-01 Circuit de protection de capteur Withdrawn EP1523795A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10232941.9A DE10232941B4 (de) 2002-07-19 2002-07-19 KFZ-Bordnetz mit einer Sensor-Schutzschaltung
DE10232941 2002-07-19
PCT/DE2003/002189 WO2004017481A1 (fr) 2002-07-19 2003-07-01 Circuit de protection de capteur

Publications (1)

Publication Number Publication Date
EP1523795A1 true EP1523795A1 (fr) 2005-04-20

Family

ID=30128188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03787619A Withdrawn EP1523795A1 (fr) 2002-07-19 2003-07-01 Circuit de protection de capteur

Country Status (5)

Country Link
US (1) US7099133B2 (fr)
EP (1) EP1523795A1 (fr)
JP (1) JP2005533478A (fr)
DE (1) DE10232941B4 (fr)
WO (1) WO2004017481A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008043923A1 (de) * 2008-11-20 2010-05-27 Robert Bosch Gmbh Schutzvorrichtung für zumindest einen dauerversorgten Kondensator
DE102011016551A1 (de) * 2011-04-08 2012-10-11 Valeo Schalter Und Sensoren Gmbh Fahrerassistenzeinrichtung, Kraftfahrzeug mit einer Fahrerassistenzeinrichtung und Verfahren zum Betreiben einer Fahrerassistenzeinrichtung
DE102011118203A1 (de) * 2011-11-11 2013-05-16 Festo Ag & Co. Kg Automatisierungssystem
KR102007397B1 (ko) * 2012-06-19 2019-08-05 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. 과전류 및 과전압 보호 장치를 포함하는 인터페이스 유닛
FR3011989B1 (fr) * 2013-10-10 2019-04-05 Valeo Systemes Thermiques Dispositif electrique ou electronique a deux tensions d'alimentation
FR3021764B1 (fr) * 2014-05-27 2016-05-27 Valeo Systemes Thermiques Dispositif electrique ou electronique a deux tensions d'alimentation
DE102015207783B4 (de) * 2015-04-15 2019-01-31 Continental Automotive Gmbh Gegen Überspannung geschütztes elektronisches Steuergerät
DE102019204619A1 (de) * 2019-04-01 2020-10-01 Robert Bosch Gmbh Sensoranordnung für ein Fahrzeug
DE102020203591A1 (de) * 2020-03-20 2021-09-23 Robert Bosch Gesellschaft mit beschränkter Haftung Schutzvorrichtung für ein an eine Schnittstelle angeschlossenes elektronisches Bauteil

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Publication number Priority date Publication date Assignee Title
US5196980A (en) * 1991-01-28 1993-03-23 John Fluke Mfg. Co., Inc. Low impedance, high voltage protection circuit
EP0552471A1 (fr) * 1992-01-21 1993-07-28 Siemens Aktiengesellschaft Circuit de protection pour circuits électroniques
DE4320112C2 (de) * 1993-06-17 2003-10-23 Bosch Gmbh Robert Monolithisch integriertes Endstufenbauteil mit einer Überlast-Schutzeinrichtung
US5414792A (en) * 1994-01-27 1995-05-09 Dax Industries, Inc. Electric throttle and motor control circuitry
TW265482B (fr) * 1994-06-01 1995-12-11 Siemens Akitengesellschaft
JP3752022B2 (ja) * 1995-08-25 2006-03-08 株式会社デンソー 故障診断機能付き電子制御装置
DE50002081D1 (de) * 1999-03-31 2003-06-12 Pepperl & Fuchs Sicherheitsbarriere zum begrenzen von strom und spannung
JP2000332207A (ja) * 1999-05-25 2000-11-30 Hitachi Ltd 過電圧保護回路
US6381114B1 (en) * 2000-03-31 2002-04-30 Micro Motion, Inc. Integrated current source feedback and current limiting element

Non-Patent Citations (1)

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Title
See references of WO2004017481A1 *

Also Published As

Publication number Publication date
US20060114632A1 (en) 2006-06-01
JP2005533478A (ja) 2005-11-04
DE10232941A1 (de) 2004-02-12
US7099133B2 (en) 2006-08-29
WO2004017481A1 (fr) 2004-02-26
DE10232941B4 (de) 2017-07-27

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