DE10223977C1 - Current measuring circuit for controlling multi-phase electric motor uses 2 measuring transducers with offset inputs coupled to combining stage providing overall output - Google Patents

Current measuring circuit for controlling multi-phase electric motor uses 2 measuring transducers with offset inputs coupled to combining stage providing overall output

Info

Publication number
DE10223977C1
DE10223977C1 DE2002123977 DE10223977A DE10223977C1 DE 10223977 C1 DE10223977 C1 DE 10223977C1 DE 2002123977 DE2002123977 DE 2002123977 DE 10223977 A DE10223977 A DE 10223977A DE 10223977 C1 DE10223977 C1 DE 10223977C1
Authority
DE
Germany
Prior art keywords
current
offset
transducer
measuring circuit
measuring
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.)
Expired - Fee Related
Application number
DE2002123977
Other languages
German (de)
Inventor
Martin Goetzenberger
Dirk Hofmann
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
Priority to DE2002123977 priority Critical patent/DE10223977C1/en
Application granted granted Critical
Publication of DE10223977C1 publication Critical patent/DE10223977C1/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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
    • G01R19/0092Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

Abstract

The measuring circuit (1) has a pair of measuring transducers (6,7) converting respective measuring signals into output signals, combined via a combining stage (8) to provide an overall output signal. Each measuring transducer has an offset input coupled to a current source or current sink (10), the combining stage provided by a difference amplifier having an offset input coupled to a reference source (9).

Description

The invention relates to a measuring circuit, in particular for Current measurement on a half-bridge circuit for control an asynchronous motor according to the preamble of claim 1.

It is known, for example, from EP 0 397 102 B1 for elec tric control of multi-phase electric motors half br use the individual phases of the electromo tors through a low-side switch Switch) with ground and through a voltage side High-side switch) with a supply voltage.

Here it is important to measure the electrical current flows in the individual phases of the electric motor because that Torque of the electric motor essentially by the current is determined.

So-called SENSEFETS are used to measure current at half bridges knows that from two parallel connected MOS transistors exist, which are controlled together. One of both MOS transistors form a main transistor Switching element of the half-bridge while the other MOS tran sistor of the SENSEFET is referred to as a sense transistor. The electrical current through the half-bridge is divided into the SENSEFET according to a component-specific ratio nis on the main and sense transistor, with the through Sense transistor flowing current is much smaller and reproduces the current through the half-bridge.

However, such SENSEFETs are only used to measure the current used in one direction because the ohmic character of a SENSEFETs normally only symmet in the forward direction Current distribution to the main and sense transistors safely provides. With a current measurement in the reverse direction  the current distribution between the main and sense transistor not exactly sym within the entire operating range metric, which leads to measurement errors.

In certain operating states of a three-phase asynchronous However, motors are two of the three phases of the Asyn chronmotors in freewheeling, the current flowing backwards through the SENSEFET flows.

Furthermore, DE 101 31 229 A1 includes a measuring circuit of the type mentioned at the beginning two transducers known, the output signals of the at the transducer brought together by a link become. However, this measuring circuit also has one Current measurement on half-bridges the above mentioned night le on.

The invention is therefore based on the object, the first to improve the measuring circuit described, that a current measurement in the forward and reverse directions is possible.

The task is based on the one described above known measuring circuit according to the preamble of the claim 1, according to the invention solved by the characterizing features of claim 1.

The invention is based on the technical knowledge that the resistive characteristic of a SENSEFET in relation to that Current divider ratio between the main and sense transistor a restriction of the operating range also in reverse direction remains. The required for a current measurement Liche symmetrical current distribution between main and sense transistor is also given for a backward measurement, if the operating range of the SENSEFET is restricted.

The invention therefore provides a measuring circuit with a Transducer that converts a measurement signal into an output signal converts, the transducer having an offset input,  to use a given offset when converting view and the measurement of a measurement signal with any To enable polarity or current direction. In the preferred The th embodiment of the invention thus becomes a measurement signal with any polarity or current direction through the pre given offset in an output signal with a given Polarity or current direction converted.

The transducer is preferably one Current amplifier that receives a measuring current on the input side and outputs a corresponding output current on the output side.

The given offset for the signal conversion is concerned it is preferably an offset current through a Current source or a current sink is specified. Vorzugswei the current source or current sink has a regulator, so that the offset current is as constant as possible.

Here, the measurement circuit for the ground-side scarf ter and for the voltage side switch of a half bridge one transducer each, both transducers one Have offset input to a pre when converting given offset to take into account and measuring a measurement Signals with any polarity or current direction possible union.

On the output side, the two transducers are linked tion member connected from the output signals of the two Transducer generates an output signal, preferably the given offset falls out.

The link is a difference amplifier of the output signals of the two transducers subtracted from each other with the given offset gone falls.  

In the preferred embodiment of the invention is made from compatibility on the output side with the input voltage pe a downstream analog / digital converter Microprocessor reached. This is the differential amplifier preferably connected to a reference voltage source, which the output voltage level of the measuring circuit by one predetermined voltage offset shifts. circuitry, this can be realized, for example, in that the Reference voltage source via a coupling resistor with the non-inverting input of the differential amplifier verbun that is.

The measuring circuit according to the invention is particularly advantageous when measuring current on a half-bridge circuit, which is used for electrical control of a phase of an asynchronous motor is used because a current measurement in the forward direction and is possible in the reverse direction.

Other advantageous developments of the invention are in the Subclaims contain or are summarized below with the description of the preferred embodiment of the Invention explained with reference to the drawings. Show it:

Fig. 1 shows a measuring circuitry according to the invention forming a block diagram,

Fig. 2 is a detailed block diagram of the current sink shown in FIG. 1,

Fig. 3 is a detailed block diagram of the differential amplifier shown in Fig. 1 and

Fig. 4 is a detailed block diagram of the current amplifier shown in Fig. 1.

The block diagram in Fig. 1 shows a measuring circuit 1 , which enables a current measurement both in the forward direction and in the reverse direction on a half bridge 2 .

The half-bridge 2 consists of two SENSEFETs 3 , 4 connected in series with a central voltage tap 5 for one phase of an asynchronous motor, the asynchronous motor not being shown for simplification. Via the voltage grip 5 , a phase current I PH flows here, which is controlled by the SENSEFETs 3 , 4 . The SENSEFET 3 here forms a voltage-side (high-side) switch and is connected to a supply voltage VCC, while the SENSEFET 4 forms a ground-side (low-side) switch and is connected to ground.

Each of the two SENSEFETs 3 , 4 consists of a main transistor TH and a sense transistor TS, the gate connections of which are connected together and are controlled jointly by a control signal Control1 or Control2, the control signal Control1 or Control2 from a motor control is generated, which is not shown for simplicity.

The main transistor TH is used to switch the half bridge 2 , while the sense transistor TS is used to measure a current I H or I L flowing through the SENSEFET 3 or 4 . The drain connections of the main transistor TH and the sense transistor TS are therefore connected together and connected to the supply voltage VCC in the SENSEFET 3 and to the central voltage tap 5 in the SENSEFET 4 .

The current I H in the SENSEFET 3 is divided into a main current and a measuring current I S1 in accordance with a component-specific division ratio k 1 , the main current flowing through the main transistor TH of the SENSEFET 3 , while the measuring current I S1 flows via the source connection of the Sense-Tran sistors TS flows to a measurement input of a current amplifier 6 of the measurement circuit 1 . It therefore applies to the measuring current I S1

I S1 = k 1 .I H.

In the same way, the current I L flowing in the half-bridge 2 on the ground side is divided into a main current and a measurement current I S2 in accordance with the same component-specific division ratio k 1 , the main current flowing through the main transistor TH of the SENSEFET 4 , while the measurement current I S2 flows through the source terminal of the sense transistor TS of the SENSEFET 4 and a current amplifier 7 of the measuring circuit 1 is supplied. So the following applies:

I S2 = k 1 .I L.

The two current amplifiers 6 , 7 are each connected on the input side to the source connection SOURCE of the main transistor TH of the SENSEFETs 3 and 4 , so that the measurement current I S1 or I S2 received by the current amplifiers 6 , 7 is again connected to the source connection SOURCE of the main transistor TH flows back.

The ohmic character of the conductive channel in the two SENSEFETs 3 , 4 ensures a symmetrical distribution of the currents I H , I L to the main transistor TH and the sense transistor TS in forward operation at I L ≧ 0 and I H ≧ 0. In addition, the current distribution is also symmetrical in reverse operation when I L < 0 or I H < 0, provided the operating range is restricted.

The two current amplifiers 6 , 7 are identical in construction and will be described in detail later with reference to FIG. 4.

The power amplifier 6 amplifies the measuring current I S1 with a component-specific gain factor k 2, wherein the power amplifier 6, an offset input, on which an off set current I OFESET applied, is determined by which the operating point of the power amplifier. 6 On the output side, the current amplifier 6 outputs an output current I A1 , which is calculated using the following formula:

I A1 = k 2 .I S1 + I OFFSET

The output current I A1 of the current amplifier 6 flows via an output resistor R1 = 500 Ω to ground, so that a voltage U A1 = I A1 .R1 is output at the output of the current amplifier.

In the same way, the current amplifier 7 amplifies the measurement current I S2 with the same gain factor k 2 , the current amplifier 7 also having an offset input which defines the working point of the current amplifier 7 . An offset current is due to the offset input of the current amplifier 7 I OFFSET at the same height, so that the current amplifier 7 ausgangssei term an output current I A2 outputs the after follow is calculated by the formula:

I A2 = k 2 .I S2 + I OFFSET .

The output current I A2 of the current amplifier 7 also flows through an output resistor R2 = 500 Ω to ground, so that a voltage U A2 = I A2 .R2 is output at the output of the current amplifier.

Furthermore, the measuring circuit has a differential amplifier 8 , which is connected on the input side to the two current amplifiers 6 , 7 and is shown in detail in FIG. 3.

The differential amplifier 8 is connected to a reference voltage source 9 , which provides an offset voltage U OFFSET and thus defines the operating point of the differential amplifier 8 . The determination of the operating point by the reference voltage source 9 advantageously enables an adaptation of the output voltage level to the input voltage level of an analog / digital converter which can be connected to the measuring circuit 1 . On the output side, the differential amplifier 8 therefore outputs a voltage U OUTPUT , which is given by the following formula:

U OUTPUT = k 3. (U A1 - U A2 ) + U OFFSET = k 3 .R1. (I A1 - I A2 ) + U OFFSET = k 3 .R1.k 2. (I S1 - I S2 ) + U OFFSET = k 3 .R1.k 1 .k 2. (I H - I L ) + U OFFSET = k 3 .R1.k 1 .k 2 .I PH + U OFFSET = k * .I PH + U OFFSET

The output voltage U OUTPUT is therefore linearly dependent on the current I PH , which flows off via the voltage tap 5 of the half-bridge 2 .

It is important here that the offset current I OFFSET is the same for those in the current amplifiers 6 , 7 , so that the two current amplifiers 6 , 7 have the same operating point. To generate the offset current I OFFSET , a current sensor 10 is therefore provided, which is shown in detail in FIG. 2.

To determine the operating points for the two current amplifiers 6 , 7 , the current sink 10 has two transistors T1, T2, each of which has an offset input of the two current amplifiers 6 , 7 via a resistor R3 = 500 Ω or R4 = 500 Ω connect to ground.

The offset current I OFFSET is here regulated by the current sink 10 by means of two operational amplifiers DA1, DA2 to a target value, the target value being predetermined by a voltage U CONTROL = 3.5 V of a reference voltage source 11 .

The two operational amplifiers DA1, DA2 are supplied with power by a further voltage source 12 with a supply voltage of VCC = +10 V.

The inverting input of the operational amplifier DA1 is connected to the ground connection of the transistor T1, while the non-inverting input of the transistor T1 is connected to the reference voltage source 11 . The operational amplifier DA1 thus regulates the offset current I OFFSET at the offset input of the current amplifier 6 to the predetermined setpoint.

In the same way, the inverting input of the operational amplifier DA2 is connected to the ground connection of the transistor T2, while the non-inverting input of the operational amplifier DA2 is connected to the reference voltage source 11 . The operational amplifier DA2 thus regulates the offset current I OFFSET at the offset input of the current amplifier 7 to its predetermined desired value.

By regulating the offset current I OFFSET is ensured that the two current amplifiers 6 , 7 have the same working point so that the subtraction in the differential amplifier 8 eliminates the quiescent current of the current amplifiers 6 , 7 .

The structure of the differential amplifier 8 will now be described, which is shown in detail in FIG. 3.

The differential amplifier 8 has two measurement inputs which are connected to the outputs of the two current amplifiers 6 , 7 . In the differential amplifier 8 , the two measuring inputs are each connected via an input resistor R5 = 10 kΩ, R6 = 10 kΩ to an operational amplifier DA3, which is supplied with current by a voltage source 13 . The operational amplifier DA3 creates a virtual short circuit between the two inputs of the differential amplifier 8 , which is important for the measurement accuracy. On the output side, the operational amplifier DA3 is connected to the inverting input of the operational amplifier DA3 via a feedback resistor R7 = 10 kΩ. In addition, the non-inverting input of the operational amplifier DA3 is connected to the reference voltage source 9 via a resistor R8 = 20 kΩ. Furthermore, the non-inverting input of the operational amplifier DA3 is connected to ground via a resistor R9 = 20 kΩ.

Finally, the structure of the current amplifier 6 will now be described with reference to FIG. 4, the current amplifier 7 being of identical construction and therefore not being described separately.

The current amplifier 6 has an operational amplifier DA4 on the input side with a downstream transistor T10, which forces the same potential at the inputs of the current amplifier 6 .

The two inputs of the current amplifier 6 are connected to one another by a resistor R10 = 100 Ω, the resistor R10 suppressing the tendency to oscillate.

On the output side, the operational amplifier DA1 is connected via three current mirror arrangements R11-R17, T3-T9 to a signal output on which the output current I A1 is output.

Since the transistor T10 only allows a current to flow in one direction, a resistance is set by the resistors R12, R17 and R16, which is mirrored by the transistors T4, T3, T9 and T8 on the input side. Due to the additional current, the exact size of which is irrelevant, the current in the transistor T10 always flows in one direction. The sense current I S1 is therefore potential-independent at the collector of the transistor T10 and is available in total with the offset current I OFFSET through the current mirror of the transistors T5, T6 and T7 to a subsequent circuit.

Furthermore, the current amplifier 6 has two voltage sources 14 , 15 , which represent the voltage supply to the measuring circuit, the supply reference potential being applied to the source connection SOURCE of the SENSEFET 3 . This is advantageous since the driver supply of the SENSEFET 3 must also relate to its SOURCE source connection.

In addition, it should be mentioned that the structure of the Stromver amplifier 6 is designed such that the internal cross current through the resistors R12, R17 and R16 or the transistors T4, T3 and T9, T8 is not included in the measurement. This is important for an integration in an IC.

The invention is not to be described above preferred embodiment limited. Rather is one Many variations and modifications possible, the just if make use of the inventive idea and therefore fall within the protection area.

Claims (8)

1. Measuring circuit ( 1 ), in particular for current measurement at a half-bridge circuit for controlling a multi-phase electric motor, with
a first measuring transducer ( 6 ) for converting a first measuring signal (I S1 ) into a first output signal (I A1 ),
a second transducer ( 7 ) for converting a second measurement signal (I S2 ) into a second output signal (I A2 ),
wherein the first transducer ( 6 ) and the second transducer ( 7 ) are connected on the output side to a logic element ( 8 ) which determines a third output signal (U OUTPUT ) from the first output signal (I A1 ) and the second output signal (I A3 ) .
characterized by
that the first transducer ( 6 ) has an offset input in order to take a predetermined offset (I OFFSET ) into account during the conversion and to enable the measurement of a measurement signal with any polarity,
that the second transducer ( 7 ) has an offset input in order to take a predetermined offset (I OFFSET ) into account during the conversion and to enable the measurement of a measurement signal with any polarity,
that the logic element ( 8 ) is a differential amplifier.
2. Measuring circuit ( 1 ) according to claim 1, characterized in that the differential amplifier ( 8 ) has an offset input which is connected to a reference voltage source ( 9 ).
3. Measuring circuit ( 1 ) according to one of the preceding claims, characterized in that the first measuring signal (I S1 ) and / or the second measuring signal (I S2 ) is a current signal.
4. Measuring circuit ( 1 ) according to claim 3, characterized in that the first transducer ( 6 ) and / or the second transducer ( 7 ) is a current amplifier.
5. Measuring circuit ( 1 ) according to claim 4, characterized in that at the offset input of the first transducer ( 6 ) and / or the second transducer ( 7 ) a current source or a current sink ( 10 ) with a predetermined offset current (I OFFSET ) is connected.
6. Measuring circuit ( 1 ) according to claim 5, characterized in that the offset current (I OFFSET ) at the offset input of the first transducer ( 6 ) is equal to the offset current (I OFFSET ) at the offset input of the second Transducer ( 7 ).
7. Measuring circuit ( 1 ) according to claim 5 or claim 6, characterized in that the current source or the current sink ( 10 ) has a Stromreg ler, which regulates the offset current (I OFFSET ) to a predetermined setpoint.
8. Measuring circuit ( 1 ) according to one of the preceding claims, characterized in that the first transducer ( 6 ) is connected on the input side to a first SENSEFET ( 3 ), while the second transducer ( 7 ) is connected on the input side to a second SENSEFET ( 4 ) is connected, the first SENSEFET ( 3 ) and the second SENSEFET ( 4 ) being part of a half bridge ( 2 ).
DE2002123977 2002-05-29 2002-05-29 Current measuring circuit for controlling multi-phase electric motor uses 2 measuring transducers with offset inputs coupled to combining stage providing overall output Expired - Fee Related DE10223977C1 (en)

Priority Applications (1)

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DE2002123977 DE10223977C1 (en) 2002-05-29 2002-05-29 Current measuring circuit for controlling multi-phase electric motor uses 2 measuring transducers with offset inputs coupled to combining stage providing overall output

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DE2002123977 DE10223977C1 (en) 2002-05-29 2002-05-29 Current measuring circuit for controlling multi-phase electric motor uses 2 measuring transducers with offset inputs coupled to combining stage providing overall output
PCT/DE2003/001640 WO2003103127A1 (en) 2002-05-29 2003-05-20 Test circuit

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Cited By (7)

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WO2012001157A1 (en) * 2010-07-01 2012-01-05 Continental Teves Ag & Co. Ohg Current sensor
EP2876453A1 (en) * 2013-11-22 2015-05-27 Analog Devices, Inc. Bi-directional current sensor
CN104914912A (en) * 2014-03-12 2015-09-16 英飞凌科技奥地利有限公司 Linear high speed tracking current sense system with positive and negative current
US9664713B2 (en) 2014-10-30 2017-05-30 Infineon Technologies Austria Ag High speed tracking dual direction current sense system
US9667243B2 (en) * 2015-09-11 2017-05-30 Infineon Technologies Austria Ag High speed tracking current sense system
EP2732488B1 (en) * 2011-07-14 2017-05-31 Continental Teves AG&Co. Ohg Device for conducting an electric current
US9798347B2 (en) 2014-10-30 2017-10-24 Infineon Technologies Austria Ag High speed tracking dual direction current sense system

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FI121561B (en) 2009-06-30 2010-12-31 Helvar Oy Ab Adjusting and measuring the functions of the electronic ballast

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012001157A1 (en) * 2010-07-01 2012-01-05 Continental Teves Ag & Co. Ohg Current sensor
CN102959407A (en) * 2010-07-01 2013-03-06 大陆-特韦斯贸易合伙股份公司及两合公司 Current sensor
CN102959407B (en) * 2010-07-01 2016-04-13 大陆-特韦斯贸易合伙股份公司及两合公司 Current sensor
EP2732488B1 (en) * 2011-07-14 2017-05-31 Continental Teves AG&Co. Ohg Device for conducting an electric current
EP2876453A1 (en) * 2013-11-22 2015-05-27 Analog Devices, Inc. Bi-directional current sensor
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CN104914912B (en) * 2014-03-12 2017-06-16 英飞凌科技奥地利有限公司 Linear high speed follow current sensing system with positive current and negative current
CN104914912A (en) * 2014-03-12 2015-09-16 英飞凌科技奥地利有限公司 Linear high speed tracking current sense system with positive and negative current
US9798347B2 (en) 2014-10-30 2017-10-24 Infineon Technologies Austria Ag High speed tracking dual direction current sense system
US9664713B2 (en) 2014-10-30 2017-05-30 Infineon Technologies Austria Ag High speed tracking dual direction current sense system
US9667243B2 (en) * 2015-09-11 2017-05-30 Infineon Technologies Austria Ag High speed tracking current sense system
DE102016115879B4 (en) 2015-09-11 2019-08-01 Infineon Technologies Austria Ag Nachverfolgungs high-speed current detection system

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Owner name: CONTINENTAL AUTOMOTIVE GMBH, 30165 HANNOVER, DE

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee