EP2691784A1 - Device for measuring a supply voltage in electric vehicles - Google Patents

Device for measuring a supply voltage in electric vehicles

Info

Publication number
EP2691784A1
EP2691784A1 EP12718102.2A EP12718102A EP2691784A1 EP 2691784 A1 EP2691784 A1 EP 2691784A1 EP 12718102 A EP12718102 A EP 12718102A EP 2691784 A1 EP2691784 A1 EP 2691784A1
Authority
EP
European Patent Office
Prior art keywords
capacitor
voltage
sensor arrangement
measured
charging
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Withdrawn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
EP12718102.2A
Other languages
German (de)
French (fr)
Inventor
Helge Grasshoff
Timo Dietz
Wolfgang Jöckel
Thomas Gaertner
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 Teves AG and Co oHG
Original Assignee
Continental Teves AG and Co oHG
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 to DE102011006377 priority Critical
Application filed by Continental Teves AG and Co oHG filed Critical Continental Teves AG and Co oHG
Priority to PCT/EP2012/055709 priority patent/WO2012130990A1/en
Publication of EP2691784A1 publication Critical patent/EP2691784A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10Measuring sum, difference or ratio
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/255Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00 and G01R33/00 - G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/16Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005Testing of electric installations on transport means
    • G01R31/006Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for dc mains or dc distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00Special adaptation of control arrangements for generators
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K7/00Modulating pulses with a continuously-variable modulating signal
    • H03K7/08Duration or width modulation Duty cycle modulation

Abstract

A sensor arrangement for measuring an electric voltage (Uterm), wherein the potential point (1), at which the electric voltage relative to a defined electric potential, in particular relative to earth, is intended to be measured, is connected to a capacitor (2), to which a comparator unit (3) is connected which ascertains whether a first defined threshold voltage (URef) is present at the capacitor (2), wherein the sensor arrangement is configured such that it provides an output signal which is dependent on at least one charging process of the capacitor (2) and comprises at least the information of the charging time for charging the capacitor to the first defined threshold voltage.

Description

Device for measuring a supply voltage in electric vehicles

The invention relates to a sensor arrangement for measuring an electrical voltage and to the use of the sensor arrangement in motor vehicles.

For battery powered vehicles it is important to know the condition of the battery. This also includes a measurement of the supply or terminal voltage.

The voltage is measured via a resistive voltage divider with a downstream A / D converter. The challenge lies in the requirement that the battery is charged with a current of> ΙΟμΑ when switched off. This is achieved, inter alia, by switching an opto-MOSFET in series, which separates the voltage divider from the battery. In addition, the voltage divider ratio increases with increasing battery voltage ¬, that must in the high-voltage

Voltage divider ratio be extremely high, for example, 1000 to 1. For many high-impedance resistors are switched in Rei ¬ hey, which is expensive. The invention is based on the object to propose a Sensoranord ¬ tion for measuring electrical voltages, which is inexpensive and yet still meets the requirements of the automotive industry

This object is achieved by the Sensoran ¬ Regulation according to claim 1.

 In particular, the sensor arrangement is also suitable for measuring relatively large voltages, without having to use a cascaded voltage divider to achieve high resistances, which is expensive.

A capacitor is preferably understood to mean a primarily capacitive element.

The sensor arrangement is preferably designed such that it converts the information of the voltage to be measured into a frequency-coded or pulse-width-coded output signal.

The sensor arrangement preferably has a time measuring unit or is connected to an external time measuring unit with which the time for charging the capacitor is measured.

The electric voltage to be measured is preferably the terminal voltage of a voltage source which is connected to the Sensoranord ¬ voltage.

The voltage source connected to the sensor arrangement preferably has a terminal voltage of at least 100V, in particular 1000V or more.

The sensor arrangement preferably has a turn-off element that is designed and connected in such a way that it removes the capacitor from the potential point of the electrical component to be measured. can see voltage, this switch-off is designed ¬ particular as a transistor, particularly preferably as a field effect transistor, for example as a MOS-FET.

The sensor arrangement is preferably designed such that it has a 2-wire interface, in particular a PSI5 interface. Particularly preferably, the sensor arrangement is designed and connected so that it is supplied via the 2-wire interface at least with electrical energy and transmits the output signal.

It is preferred that the sensor arrangement is designed so that the voltage to be measured charges the capacitor via an intermediate charging resistor and the capacitor is subsequently discharged, said Ausgangssig ¬ nal of the sensor arrangement contains at least the information in which charging time of the capacitor to the first defined threshold voltage, which is detected by the comparator, is charged.

It is expedient that the comparator unit is configured as monosta ¬ bile flip-flop, which is formed in particular triggerable, particularly preferably for initialization or at the start of a measuring operation.

It is preferred that the shutdown element is designed and interconnected such that at its control input or

Switching input or gate / base terminal is applied a second reference ¬ voltage and the base point or source / emitter terminal of the shutdown element is connected to the capacitor and in the course of charging the capacitor approaches the electrical potential at the bottom of the second ¬ ten reference voltage and / until then the switch-off ¬ element separates the capacitor from the potential point of mes ¬ send electrical voltage. The sensor arrangement is preferably designed such that the voltage to be measured over a zwischenge ¬ off load resistor is applied to the collector or drain terminal of the transistor configured as Abschaltele ¬ ments at least, wherein to the base terminal or

Gate terminal of a second reference Abschaltelements clamping ¬ voltage is applied, which is in particular higher than the first defined threshold voltage, wherein the

Emitter connection or source terminal of the turn-off element of the capacitor is connected and connected in parallel with the capacitor, a switch which is arranged so that it can bring about a wiring, which leads to a discharge of the capacitor, and wherein the

Emitter terminal or source terminal of the turn-off additionally the comparator unit is connected, which is adapted to detect the voltage across the capacitor and compared with the first threshold voltage, and in the case that the first threshold voltage applied to the capacitor, the switch is actuated, so that the capacitor Entla ¬ is or can be.

It is preferred that the sensor arrangement is designed in such a way that it can carry out measurements in succession in free-running fashion and for this purpose the comparator unit has a fixed hysteresis and is designed to be free-running.

It is expedient that the comparator unit is designed such that it is connected to a supply voltage, wherein in the case that this supply voltage is not availabl ¬ bar, the sensor arrangement and the comparator are formed so that the switch is a switching state ¬ occupies, in which the capacitor can be charged or not discharged and that the switch-off element assumes a state that it separates the voltage to be measured from the capacitor. It is expedient that the sensor arrangement itself a

Computing unit has or is connected to a computer unit ¬ connected, in which the height of the voltage to be measured is calculated from the charging time detected by the time measuring unit.

It is preferred that the at least one charging resistor and the capacitor in substantially the same temperature coefficient and / or a substantially identical temperature dependence having, at least within a DEFINE ¬ th temperature interval.

It is preferred that the sensor arrangement is designed so that it provides an output signal that each voltage ¬ measurement encoded by a pulse whose pulse width is dependi of the charging time of the capacitor, in particular wherein the edges of a pulse of a through time points

Trigger signal of the comparator to start the voltage measurement ¬ and reaching the voltage at the capacitor accordingly the first threshold voltage are defined and / or by the time interval of these times.

The voltage measurement in the measuring device is preferably no longer via a resistive voltage divider, which must be isolated when the supply voltage from the battery, but via a voltage-frequency - or pulse width converter circuit, the liert himself in the absence of supply voltage from the voltage source or battery ¬ is ¬ , The voltage information lies in the frequency, which can be measured very accurately with a μθ. It also eliminates the need for a second A / D converter channel. In addition, it is possible to dynamically, galvanically disconnects from the high-voltage battery to the low-voltage circuit to transfer.

The invention also relates to the use of the sensor arrangement in motor vehicles.

Fig. 1 shows a schematic representation of an embodiment of the sensor arrangement, wherein the potential point 1 rela ¬ tively applied to the ground voltage, as terminal voltage U K iemm the voltage source 6, is measured. The voltage to be measured is applied via at least one intermediate load resistor 7 to the collector or drain terminal of the Abschaltelements 4 formed as a MOS FET transistor, to the base terminal or gate terminal of the turn ¬ elements, a second reference voltage U2 is applied, which is in particular higher when the first defined Schwellspan ¬ voltage U Re f, being connected to the emitter terminal or source terminal of the Abschaltelements 4, the capacitor 2, and is connected parallel to the capacitor, a switch 8, which is arranged such that it can lead ¬ a wiring induced, which leads to a discharge of the capacitor. The discharge of the capacitor 2 is caused by comparator 3. At the emitter terminal or source terminal of the ex ¬ switching element 4 is in addition, the comparator unit 3 is attached ¬ closed, which is adapted to detect the tensioning ¬ voltage across the capacitor 2 and compares it with the first threshold voltage U Re f, and in the case that the first Schwellspan ¬ voltage applied to the capacitor, the switch is actuated, so that the capacitor is discharged.

The comparator unit 3 is exemplified as monostable

Tripple formed, which is triggerable, via the input trigger to start a measurement process.

The comparator unit 3 is designed to be connected to a Supply voltage is connected, wherein in the event that this supply voltage, for example, "ignition off" in a motor vehicle is not available, the sensor ¬ arrangement and the comparator are designed so that the switch 8 assumes a switching state in which the capacitor 2 charged can be or is not discharged, so it is open, and that the switch-off element 4 assumes a state that it separates the voltage to be measured from Kon ¬ capacitor.This is achieved by the Abschaltele ¬ ment 4 is formed and interconnected, that at its control input or switching input or gate / base terminal, the second reference voltage U2 is applied and the base point or source / emitter terminal of the turn-off element 4 is connected to the Kon ¬ capacitor 2 and in the course of a

Charging the capacitor approaches the electrical potential at the base of the second reference voltage and / until that then the turn-off element separates the capacitor 2 from the Potenti ¬ alpunkt of the measured electrical voltage U K iemm.

The sensor arrangement is designed so that it consists ¬ output signal provides the each voltage measurement by ei ¬ NEN pulse coded whose pulse width depends on the charging time of the capacitor 2, wherein the edges of a Pul ¬ ses through the points in time of a trigger signal of the

Comparator unit to start the voltage measurement and the voltage at the capacitor to be defined according to the first threshold voltage or by the time interval of these times.

Claims

claims
1. Sensor arrangement for measuring an electrical voltage (U K iemm), characterized in that the potential point (1) at which the electrical voltage relative to a defined electrical potential, in particular relative to the mass to be measured with a capacitor (2) is connected to which one
Connected to the comparator unit (3) which detects whether a first defined threshold voltage (U Re f) applied to the Kon ¬ capacitor (2), wherein the sensor arrangement is designed so that it provides an output signal, which depends on at least one charging process of Capacitor (2) and at least includes the information of the charging time for charging the capacitor to the first defined threshold voltage.
2. Sensor arrangement according to claim 1, characterized in that the sensor arrangement has a time measuring unit or is connected to an external time measuring unit with which the time for charging the capacitor (2) is measured.
3. Sensor arrangement according to claim 1 or 2, characterized in that the electrical voltage to be measured is the terminal voltage (U K iemm) of a voltage source (6) which is connected to the sensor arrangement.
4. Sensor arrangement according to at least one of claims 1 to 3, characterized in that the sensor arrangement comprises a shut-off element (4) which is designed and connected so that it is the capacitor (2) of the potential point (1) of the electrical voltage to be measured (U K iemm) can separate, said turn-off element (4) is designed in particular as a transistor.
5. Sensor arrangement according to at least one of claims 1 to 4, characterized in that the sensor arrangement is formed so that the voltage to be measured (U K iemm) charges the capacitor (2) via an intermediate charging resistor (7) and the capacitor (2 ) is subsequently discharged, wherein the output signal of the sensor arrangement contains at least the information in which charging time of the capacitor up to the first defined threshold voltage (U Ref ), of the
 Comparator unit (3) is detected, is charged.
6. Sensor arrangement according to at least one of claims 1 to 5, characterized in that the
Comparator unit (3) is formed as a monostable multivibrator ¬ is formed in particular triggerable.
7. Sensor arrangement according to at least one of claims 4 to 6, characterized in that the turn-off element (4) is designed and interconnected, that at its control input a second reference voltage (U2) is applied and the base of the turn-off element (4) with the Kon ¬ capacitor (2) is connected and in the course of a
Charging the capacitor approaches the electrical Potential ¬ tial at the base of the second reference voltage (U2) and that then the shutdown element (4) the capaci ¬ tor of the potential point (1) of the electrical voltage to be measured.
8. Sensor arrangement according to at least one of claims 1 to 7, characterized in that the voltage to be measured via at least one intermediate charging resistor (7) to the collector terminal or
Drain terminal of the designed as a transistor Ab ¬ switching element (4) is applied, wherein the base is applied circuit or gate terminal of the Abschaltelements a second reference voltage (U2), which in particular ¬ sondere is higher than the first defined Schwellspan ¬ voltage (U Ref), wherein the emitter terminal or
Source terminal of the turn-off of the capacitor is closed to ¬ and parallel to the capacitor, a switch (8) is connected, which is arranged so that it can bring about a wiring, which leads to a discharge of the capacitor, and wherein at the emitter terminal or source terminal of Abschaltele ¬ In addition, the comparator unit is connected, which is set up in such a way that it detects the voltage across the capacitor (2) and compares it with the first threshold voltage, and in the case that the first one
Threshold voltage is applied to the capacitor, the switch is actuated, so that the capacitor is discharged or can be.
Sensor arrangement according to at least one of claims 1 to 8, characterized in that the sensor arrangement is designed so that they can perform measurements in freewheeling nach ¬ each other and to the comparator unit (3) has a fixed hysteresis and is free-running ¬ forms.
Sensor arrangement according to claim 8 or 9, characterized in that the comparator unit (3) is formed so that it is connected to a supply voltage, wherein in the event that this supply voltage is not available, the sensor arrangement and the
Comparator are formed so that the switch assumes a switching state in which the capacitor can be charged or not discharged and that the shutdown element (4) assumes a state that it is the voltage to be measured from the capacitor (2) separates.
11. The sensor arrangement according to at least one of claims 1 to 10, characterized in that the sensor assembly itself has a computer unit or is connected to a computing ¬ nereinheit in which from the information detected by the time measuring unit charging time, the amount of the voltage to be measured is calculated.
12. Sensor arrangement according to at least one of claims 1 to 11, characterized in that the at least one charging resistor (7) and the capacitor (2) in wesentli ¬ chen same temperature coefficient and / or have a substantially equal temperature dependence, at least within a defined temperature interval ,
13. The sensor arrangement according to at least one of claims 1 to 12, characterized in that the sensor arrangement is designed so that it provides an output signal ¬ encoding each voltage measurement by a pulse whose pulse width depends on the
 Charging time of the capacitor, in particular wherein the edges of a pulse by the times of a
Trigger signal of the comparator to the start of Span ¬ voltage measurement and the achievement of the voltage at the capacitor are defined according to the first threshold voltage and / or by the time interval of these times.
14. Use of the sensor arrangement according to at least one of claims 1 to 13 in motor vehicles.
EP12718102.2A 2011-03-29 2012-03-29 Device for measuring a supply voltage in electric vehicles Withdrawn EP2691784A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102011006377 2011-03-29
PCT/EP2012/055709 WO2012130990A1 (en) 2011-03-29 2012-03-29 Device for measuring a supply voltage in electric vehicles

Publications (1)

Publication Number Publication Date
EP2691784A1 true EP2691784A1 (en) 2014-02-05

Family

ID=46025623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12718102.2A Withdrawn EP2691784A1 (en) 2011-03-29 2012-03-29 Device for measuring a supply voltage in electric vehicles

Country Status (6)

Country Link
US (1) US9239342B2 (en)
EP (1) EP2691784A1 (en)
KR (1) KR20140017631A (en)
CN (1) CN103534600A (en)
DE (2) DE102012205154A1 (en)
WO (1) WO2012130990A1 (en)

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Also Published As

Publication number Publication date
WO2012130990A1 (en) 2012-10-04
DE102012006269A1 (en) 2012-10-04
US9239342B2 (en) 2016-01-19
DE102012205154A1 (en) 2012-10-04
CN103534600A (en) 2014-01-22
US20140015513A1 (en) 2014-01-16
KR20140017631A (en) 2014-02-11

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