EP2780579A1 - Dispositif et procédé destinés à vérifier l'état de la connexion d'une charge connectée à un point de connexion - Google Patents

Dispositif et procédé destinés à vérifier l'état de la connexion d'une charge connectée à un point de connexion

Info

Publication number
EP2780579A1
EP2780579A1 EP12797767.6A EP12797767A EP2780579A1 EP 2780579 A1 EP2780579 A1 EP 2780579A1 EP 12797767 A EP12797767 A EP 12797767A EP 2780579 A1 EP2780579 A1 EP 2780579A1
Authority
EP
European Patent Office
Prior art keywords
connection point
potential
voltage
load
switching element
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Withdrawn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
EP12797767.6A
Other languages
German (de)
English (en)
Inventor
Harald Schmauss
Sergiu Muresan
Gunther Wolfarth
Marco Well
Johann Falter
Franz Laberer
Cristian THEIL
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
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2780579A1 publication Critical patent/EP2780579A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Definitions

  • the invention relates to a device for switching a load to the high or the low potential of a supply voltage by means of switching elements, and for testing the state of connection of the load with a connection point between the switching elements, wherein a first switching element between the high supply voltage potential and the connection point and a second switching element is connected between the connection point and the lower supply voltage potential, wherein the device has at least one voltage or current source which can be connected to the connection point, and wherein the device has a potential evaluation circuit which is connected to the connection point.
  • Such a device is known from DE 102007002953 AI.
  • a large number of consumers have to be switched on and off, with power transistors or relays being used for switching because of the high currents that are usually required for switching.
  • Corresponding consumers can be, for example, the headlights, but also electric motors, for example for windows, valves, injectors or ignition coils. In any case, the corresponding circuit breaker must be controlled, including either so-called.
  • Highside switches which are connected to a terminal with the supply voltage, or lowside switches, which are connected to a terminal connected to ground.
  • Such control switches are usually realized in a larger number in ASICs (applicant specific integrated circuit), the in turn controlled by control units such as microprocessors.
  • Such circuit arrangements which are mostly realized as ASICs, are known, for example, from DE 10 2006 045 308 A1 or DE 199 20 465 C1. It is also disclosed in DE 199 20 465 C1 that instead of a high-side or low-side switch, it is also possible to use a push-pull output stage, which consists of both a high-side and a low-side switch, which then optionally the load can be switched on so that they can either be connected to the positive supply voltage potential or ground. This may be of interest if capacitive load components are to be discharged in a targeted manner.
  • Such switches must be checked to see if the connection to the switching load is intact, or if there is an open circuit, but also checked for short circuits against the supply voltage potentials and / or overcurrents.
  • a line interruption can - as disclosed in DE 10 2006 045 308 AI - at the connection point of the load with the circuit element containing circuit selectively applied a certain potential or a particular current are impressed, in which case the self-adjusting potential is then checked whether it is in certain predefined areas. If the connection is OK, a low potential will usually set, since the connected load usually has a low resistance. However, if there is a line break, the predetermined by the impressed voltage or the impressed current potential, so that it can be detected. For this test, the highside or lowside switch must be off.
  • DE 199 20 465 C1 discloses, in particular for the activation of an ignition device, the test when not activated
  • DE 102004 054374 B3 discloses a circuit arrangement for providing a diagnostic signal having a test circuit which tests the power switching device and fault symptoms depending on the test generates a filter device which, depending on a drive signal for driving the power switching devices, in each case provides a validity signal for the generated fault symptoms, the validity signal in each case determining the validity of the corresponding fault symptoms
  • Error symptom has a validation device which validates a generated error symptom depending on the associated validity signal and the drive signal and generates therefrom a group of states and complementary complementary states and has an encoder, the states and complementary states depending on the states and complementary states associated priorities the error types coded, wherein the diagnostic signal from the coded states and complementary states is formed.
  • the invention means for switching a load to the high or low potential of a Supply voltage by means of switching elements and for testing the state of connection of the load with a connection point between the switching elements, in which a first switching element between the high supply voltage potential and the connection point and a second switching element between the
  • Connection point and the lower supply voltage potential is connected to a voltage or Stromguelle, which is connectable to the connection point and a Potentialauswertesclien, which is connected to the connection point, wherein the Potentialauswertesclien is formed with at least two comparators, wherein the reference input of the first comparator with a Voltage source for a low voltage and the reference input of the second comparator with a voltage source for a voltage for a line interruption is connected.
  • connection point being between a first switching element formed between a high supply voltage potential and the connection point and a second switching element connected between the connection point and a low supply voltage potential in accordance with the invention in the switched-off state of the two switching elements by at least a connected to the connection point voltage or current source constructed a potential at the connection point and checked by means of a Potentialauswertescaria whether the potential is within a defined potential range and if so, closed on a line break between the connection point and the load.
  • the check of the connection of the connection point to a connected load is only carried out in a switching element designed as a push-pull output stage, when the switching elements are both switched off.
  • the building up of the potential at the connection point takes place only after the first switching element and then the second switching element have been switched on and off again.
  • This is particularly advantageous in a load which is formed by an ignition device in a motor vehicle, and which is connected by closing the first switching element to the supply voltage potential and thereby energized, wherein when switching off the first
  • Switching element on the one hand takes place the ignition of the ignition device and on the other hand by switching on the second
  • the potential is checked at the connection point during a predetermined test period.
  • This vomZeitdauer can also be composed of several consecutive EinzelprüfZeitdauern.
  • the test duration is determined as a function of capacitive components of the load. As a result, it can be ensured that the potential at the connection point no longer appreciably changes due to the connected capacitive load.
  • the check of a line interruption in the context of a predetermined test scheme in which also short circuits of the connection point against the high and / or the low supply voltage potential and other fault symptoms are checked.
  • FIG. 1 shows a device according to the invention as a block diagram
  • FIG. 2 shows the phases of switching the switching element on and off in the case of an ignition device as a load
  • FIG. 3 a shows the profile of the voltage and the current at the connection point when the first switch and the connected load are switched on
  • FIG. 3 b shows the profile of the voltage and the current at the connection point when the second switch and the connected load are switched on.
  • FIG. 3 c shows the curve of the voltage and the current at the connection point when both switches are switched off (tristate); the possible diagnostic results with the switching elements switched off and the test voltage switched on or off; switched on test current,
  • Figure 5 shows the course of the voltage and the current in case of short circuit to ground of the connection point (over current)
  • FIG. 1 shows a device 1 according to the invention for testing the connection of a load L connected to a connection point 5.
  • the load L in the illustrated embodiment is an ignition device for a motor vehicle whose input impedance relevant to the device 1 comprises a load resistor R LOAD and a load capacitance C LOAD are shown.
  • the ignition device consists of an ignition coil, which is connected on the secondary side via a diode operated in the reverse direction with a schematically illustrated spark plug and the primary side is connected on the one hand to the battery voltage U BATT and on the other hand via a power transistor IGBT to ground.
  • the power transistor IGBT is driven by a buffer amplifier and a series resistor connected upstream of it. The bias and the buffer amplifier form the said input impedance.
  • connection point 5 which is connected to a corresponding output pin of the device 1, on the one hand via a semiconductor switch HS, which is formed in the illustrated example of two series-connected P-channel MOSFETs HSa, HSb, which are connected to each other with their drain terminals , And connected via a series-connected first current measuring resistor Rl to the positive potential of the supply voltage V DD5 _ IGN .
  • the connection point 5 is connected to the ground terminal via a second switching element LS, which is formed with an N-channel MOSFET, and a second current measuring resistor R2.
  • the control terminals of the first and second switching element HS, LS are controlled by a gate drive 2 in a known manner to connect the load L either to the positive supply voltage terminal V GDS _ IGN or to ground.
  • a voltage source 3 can be connected in accordance with the invention via a switch S2, which in the illustrated example is designed as a voltage follower and apply a voltage of 2.5 V to the connection point 5 with a precisely defined current (for example +/- 75 ⁇ ) can.
  • a potential evaluation circuit 4 is also connected, which is formed with three comparators Kl, K2, K3, whose one input is connected to the connection point 5.
  • the respective other inputs of the comparators K1, K2, K3 are subjected to voltage threshold values for a low voltage threshold V LVT (low voltage threshold), a voltage V 0 L (open load) and a voltage V ov (overvoltage).
  • Corresponding signals are output at the outputs of the comparators K1 to K3 when the voltage V 0U T at the connection point 5 exceeds the respective voltage threshold values V 0 L, V LV T and / or V 0 v.
  • the potential evaluation circuit 4 also has a fourth comparator K4, whose one input is connected to the connection point of the first switching element HS and the first current measuring resistor Rl and whose second input is supplied with a threshold value for an overflow HS_OC_THD.
  • the output of the fourth comparator K4 indicates at its output with the signal OC_HS, whether in the highside path of the output stage, ie in the path between the positive supply voltage V DD 5 _ I GN and the connection point 5, an overcurrent flows, for example, by a short circuit caused in the lowside path.
  • a fifth comparator K5 is provided, whose one input is connected to the connection point of the second switching element LS and the second current measuring resistor R2 and whose second input is supplied with a voltage threshold LS_OC_THD, and which provides at its output a signal OC_LS, which announces , if a
  • FIG. 2 shows how by means of the first
  • Switching element HS and the second switching element LS of the device 1 can be operated as a trained ignition circuit for a motor vehicle load L.
  • the control circuit 2 applies a control signal HS_ON control to the control input of the first switching element HS, whereby the connected load L is connected to the positive supply voltage potential VDD_IGN and by corresponding activation of the circuit breaker IGBT (shown in FIG. 1)
  • the primary coil of the ignition coil is energized, which is shown in Figure 2 by an increasing current.
  • Switching element HS switched off again, whereby it comes in the secondary branch of the ignition coil of the load L to a voltage increase, which leads to a spark in the spark plug.
  • Igniter ignition switch IGBT sure, with the switching off of the first switching element HS, the second switching element LS by means of the control signal LS_ON control turned on by the control circuit 2 and turned off again at a time t3. Thereafter, both switching elements HS, LS are turned off and the connection point 5 is in a so-called tristate state, it is high impedance. In this state after such an ignition process, the test for a cable break is advantageously carried out according to the invention.
  • the first switching element HS is controlled by the control signal HS_ON control at a time t 1.
  • Circuit 2 switched on. Characterized the connection point 5 and a connected load L connected to the positive comparison sorgungs voltage potential V DD5 _ IGN is connected, whereby - as shown in Figure 3a can be seen - with intact compound of the load L to the connecting point 5, a potential corresponding to the supply potential V DD5 established.
  • a current ⁇ 0 ⁇ flow, the magnitude of which will be below a threshold for an overcurrent I 0C _ HS .
  • the load L will be connected via the second switching element LS in intact connection to the ground terminal, so that the Voltage V OÜT will set at connection point 5 to about 0 V, if any load capacitance C LOAD has discharged.
  • FIG. 3b it is assumed that the load connected to the connection point 5 lies with its other connection at a positive supply potential, so that -as shown in FIG. 3b -a positive current ⁇ 0 is to be measured at the connection point 5 ,
  • Switching element LS is turned off and the connection point 5 accordingly in a high-impedance state, which is commonly referred to as tristate Zusand passes, after a short time, which is necessary for discharging any existing capacity, the current ⁇ 0 ⁇ set to 0 A. and the voltage V OÜT at the connection point 5 assume a value of about 0 V.
  • connection of the connection point 5 to a connected load L is now checked.
  • a potential is applied to the connection point 5 by means of a test voltage source 3, which potential is between two threshold values for a lower one Voltage V LV T and a voltage for a line break V 0 L is.
  • connection point 5 The voltages V.sub.OU.sub.T at the connection point 5 which now occur as a result of various fault states are shown in FIG.
  • a test voltage is applied to the connection point 5 at a time t 1 by means of the test voltage source 3, and after a first test time t 0 L_iGN the voltage detected at the connection point 5 by means of the potential evaluation circuit 4 intervenes at a time t8 0 V and the threshold for a low voltage V LV T (low voltage threshold) is, it is concluded that there is no error, the connection line is thus intact (no VOL failure).
  • a second test time t D iAG is started, after which the voltage at the connection point 5 is checked. If this lies between the threshold value for a low voltage V LV T and a threshold value for a line interruption V 0 L, a line interruption is concluded (VOL failure).
  • FIGS. 5 and 6 Such further tests are shown by way of example in FIGS. 5 and 6, wherein it is shown in FIG. 5 that in order to detect an overcurrent caused, for example, by a short circuit via the second switching element LS, the first switching element HS is switched on and the current is determined by means of the fourth comparator K4. If this amount is above a threshold I 0C _H S SO is on a short circuit of the second switching element LS to ground closed and made a shutdown of the first switching element HS at a time t3.
  • Switching element LS and checking the current by means of the fifth comparator K5 and the second current sense resistor R2 are closed to an overcurrent in the highside path when the detected current is above a threshold I 0C _ LS . Again, after a test time toc a shutdown of the second switching element takes place in order to avoid damage to the device due to excessive heating.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention concerne un dispositif et un procédé destinés à vérifier l'état de la connexion d'une charge (L) connectée à un point de connexion (1), le point de connexion (5) étant réalisé de manière ce qu'il se trouve entre un premier élément de commutation (HS) disposé entre un potentiel élevé de tension d'alimentation (VDD5_IGN) et le point de connexion (5) et un deuxième élément de commutation (LS) disposé entre le point de commutation (5) et un potentiel faible de tension d'alimentation (⊥). Lorsque les deux éléments de commutation (HS, LS) sont désactivés, au moins une source de tension ou de courant électrique (3) laquelle est branchée sur le point de connexion (5) permet d'établir un potentiel au point de connexion (5) lequel est vérifié au moyen d'un circuit d'analyse de potentiel (4) pour ainsi déterminer si le potentiel (VOUT) se situe dans un domaine de potentiel défini et, le cas échéant, en déduire que la ligne entre le point de connexion (5) et la charge (L) est interrompue.
EP12797767.6A 2011-11-15 2012-11-14 Dispositif et procédé destinés à vérifier l'état de la connexion d'une charge connectée à un point de connexion Withdrawn EP2780579A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011086412.1A DE102011086412B4 (de) 2011-11-15 2011-11-15 Vorrichtung und Verfahren zum Testen des Zustands der Verbindung einer mit einem Verbindungspunkt verbundenen Last
PCT/EP2012/072650 WO2013072385A1 (fr) 2011-11-15 2012-11-14 Dispositif et procédé destinés à vérifier l'état de la connexion d'une charge connectée à un point de connexion

Publications (1)

Publication Number Publication Date
EP2780579A1 true EP2780579A1 (fr) 2014-09-24

Family

ID=47297146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12797767.6A Withdrawn EP2780579A1 (fr) 2011-11-15 2012-11-14 Dispositif et procédé destinés à vérifier l'état de la connexion d'une charge connectée à un point de connexion

Country Status (4)

Country Link
US (1) US20140327450A1 (fr)
EP (1) EP2780579A1 (fr)
DE (1) DE102011086412B4 (fr)
WO (1) WO2013072385A1 (fr)

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AT518178B1 (de) * 2016-02-15 2017-08-15 Omicron Electronics Gmbh Prüfgerät zum Prüfen einer Steuereinheit einer Schaltvorrichtung einer Schaltanlage
US10338126B2 (en) 2016-04-15 2019-07-02 Infineon Technologies Ag Open load detection in output stages
DE102017201210A1 (de) 2017-01-26 2018-07-26 Robert Bosch Gmbh Verfahren und Schaltungsanordnung zum Erkennen eines Zustands einer an einem Schaltungsanschluss angeschlossenen Last
DE102017223327A1 (de) * 2017-12-20 2019-06-27 Robert Bosch Gmbh Verfahren zum Überprüfen einer Endstufe zum Ansteuern einer Last
KR102586102B1 (ko) * 2018-02-05 2023-10-05 삼성에스디아이 주식회사 배터리 보호 회로 및 이를 포함하는 배터리 팩
SG11202012030TA (en) 2018-09-17 2021-04-29 Carrier Corp Self validation of controller internal circuits
DE102020200260A1 (de) * 2020-01-10 2021-07-15 Vitesco Technologies GmbH Schaltungsanordnung zur Diagnose einer Service-Disconnect-Leitung eines elektrisch betriebenen Fahrzeugs
CN111273197B (zh) * 2020-04-01 2022-09-20 福建龙净脱硫脱硝工程有限公司 一种电气设备测试方法及装置
US11699998B2 (en) * 2021-08-17 2023-07-11 Allison Transmission, Inc. Switch assembly with feedback signal for fault detection
DE102022211724A1 (de) 2022-11-07 2024-05-08 Robert Bosch Gesellschaft mit beschränkter Haftung Ausgangstreiber für ein Steuergerät eines Fahrzeugs

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Also Published As

Publication number Publication date
WO2013072385A1 (fr) 2013-05-23
US20140327450A1 (en) 2014-11-06
DE102011086412B4 (de) 2023-06-15
DE102011086412A1 (de) 2013-05-16

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