WO2018103781A1 - Dispositif de mesure du courant ainsi que procédé de mesure d'un courant électrique dans un conducteur - Google Patents

Dispositif de mesure du courant ainsi que procédé de mesure d'un courant électrique dans un conducteur Download PDF

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Publication number
WO2018103781A1
WO2018103781A1 PCT/DE2017/100979 DE2017100979W WO2018103781A1 WO 2018103781 A1 WO2018103781 A1 WO 2018103781A1 DE 2017100979 W DE2017100979 W DE 2017100979W WO 2018103781 A1 WO2018103781 A1 WO 2018103781A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
voltage
measuring
commutation path
measuring device
Prior art date
Application number
PCT/DE2017/100979
Other languages
German (de)
English (en)
Inventor
Carsten Henkenius
Original Assignee
Universität Paderborn
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 Universität Paderborn filed Critical Universität Paderborn
Priority to EP17825730.9A priority Critical patent/EP3552029A1/fr
Priority to CN201780075776.1A priority patent/CN110114684B/zh
Publication of WO2018103781A1 publication Critical patent/WO2018103781A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Definitions

  • the invention relates to a current measuring device for measuring an electric current in a conductor of a power electronic device, in particular a regulated power electronic converter, with a current transformer associated with the current transformer.
  • the invention relates to a method for measuring an electric current in a conductor of a power electronic device, in particular a power electronic converter, wherein the electric current is measured by means of an inductive current transformer.
  • the object of the present invention is therefore to specify a current-measuring device and a method for measuring an electric current in a current conductor of a power-electronic device, such that a fully compliant Current flow can be determined, with negative effects are minimized by Kommutleitersinduktditeen.
  • the invention should be used for silicon carbide or gallium nitride components.
  • the current measuring device comprises a current detection unit having an amplifier winding which is associated with the current to be measured leading current conductor for determining a coil voltage representing the current to be measured, which comprises the current transformer, which is arranged in a second commutation path for determining a measurement voltage representing the current to be measured, which has a first gradient curve which comprises an observer module to which the measuring voltage and the coil voltage are applied on the input side and which is designed such that a Output signal of the observer module in the passage state of the second Kommut ist istspfades corresponds to a course of the measuring voltage and in a passage state of the first Kommutêttechnikspfades corresponds to a course of an estimated signal, wherein the estimation design al is formed by continuation of the measurement voltage with a magnitude equal to the first gradient course, but negative second pitch curve.
  • the invention enables a very cheap and compact construction of a current measuring device, which can be placed in a very small space. Additional inductances in a commutation path are reduced to the bare minimum. Furthermore, switching characteristics of the power electronic switches are hardly affected.
  • the basic idea of the invention is to determine a total current in power electronics arrangements on the basis of an observer principle. Only a single current transformer is used to measure the electric current in a commutation path. The measurement of the current through this current transformer takes place during the transmission state of this commutation path.
  • a current detection unit is provided, at the input of which a test signal output by the current transformer and, on the other hand, a coil signal dropping in a coil connecting the commutation path with an input voltage is present.
  • the current determination unit is designed such that an output signal is determined on the basis of these two input signals, which corresponds to the course of the measurement signal in the passage state of the one commutation path in which the current transformer is located, and which corresponds to the course of an estimation signal in the pass-through state of the other commutation path.
  • the estimated signal is calculated as a continuation of the measurement signal determined in a commutation path and has the same absolute gradient progression as the measurement signal, but with a slope that is negative for the measurement signal.
  • the output signal which corresponds to the total current to be determined, has the course of the measurement signal in the pass-through state of the one commutation path, while it "connects" to the measurement signal in the pass-through state of the other commutation path and continues with a negative slope it is the case with the measurement signal.
  • the current detection unit on the one hand on a current detection device with the current transformer and a rectifier bridge circuit and a switching unit for selectively switching a rectifier bridge path, by means of which a measurement signal can be provided.
  • the current detection unit has an observer module, at the input of which the measurement signal and a coil voltage are present, which drops across the coil which is arranged in the current branch which extends between a connection point of the one (first) commutation path and the other (second) Kommut réellespfades on the one hand and a terminal of the input voltage on the other hand extends.
  • This observer module has a multiplier for multiplying the coil voltage and a regulator voltage, and an integrator integrating a multiplier voltage at the output of the multiplier to the output signal.
  • the observer module has a controller, to whose input a control difference consisting of the output signal and the measurement signal is present.
  • the observation module during the passage state of a commutation path in which the current transformer is calibrated, wherein the output signal approaches the measurement signal.
  • the course of the output signal during the passage state of a commutation path thus corresponds to the measurement signal. If there is a changeover from one commutation path to the other commutation path in which the amplifier coil is arranged, the output signal is determined as an estimated value, assuming the estimated value of the measurement signal at the switchover time and that with negative slope to the previous measurement signal during the pass-through state of the other one Commutation path is continued. In the pass-through state of the other commutation path, an estimate of the current value thus takes place.
  • the invention in conjunction with the preamble of claim 9 is characterized in that the electrical current is measured as a measuring signal by means of the current transformer in a second Kommut réellespfad, while the second Kommut réellespfad is in the für effetsschreib that the electric current in the passage state of a first Kommut réellespfades estimated signal is only estimated, the estimated signal after switching from the second Kommut réellespfad on the first Kommut réellespfad from the measurement signal under negative slope to the slope of the measurement signal in the previous passage state of the second Kommuttechnikspfades, continues.
  • the current measuring method according to the invention is inexpensive, fast and very compact. In particular, it enables current regulation and monitoring in regulated power electronic converters.
  • the compact design of the current measuring device enables the placement of a current detection in a very small space, so that the influence on the switching behavior of power electronic semiconductor devices is reduced to a minimum.
  • the current measuring method is particularly suitable for fast switching power electronic components, such as silicon carbide (SiC) or gallium nitride (GaN) semiconductor devices.
  • Fig. 1 is an illustration of a current measuring device according to the invention for
  • Fig. 4 is a time chart of sizes of the current measuring device before and after switching from one Kommutêtspfad to another Kommut réellespfad.
  • the current measuring device can be used to measure an electric current in a current conductor of a power electronic device.
  • 1 shows by way of example a half-bridge circuit having a first commutation path 1 comprising a first power electronic component D H and a second commutation path 2 comprising a second power electronic component DL.
  • the power electronic components D H , D L may be formed, for example, as a thyristor or diodes. It is assumed that both an input voltage Ui and an output voltage U 2 are constant and greater than zero. In addition, the output voltage U 2 is greater than the input voltage Ui.
  • the current measuring device essentially consists of a current detection unit 3, which has an observer module 4, a coil winding or amplifier winding L with a proportionality constant Ki and a current transformer 6 with a proportionality constant K 2 .
  • the coil winding L is assigned to the one current to be measured i L leading current conductor (commutation path 2).
  • the coil winding L is arranged in a branch current, which connects a connection point 40 with a terminal of the input voltage Ui.
  • the connection point 40 is arranged between the power electronic component DH arranged in the first commutation path 1 and the power electronic component D L arranged in the second commutation path 2.
  • the coil winding L is not arranged in parallel with the power electronic component DH arranged in the first commutation path 1.
  • the current transformer 6 is in series with that in the second Commutation path 2 arranged power electronic device D L arranged.
  • the current transformer 6 is preferably designed as an inductive current transformer.
  • the switches S H , S L are switched on or off alternately, as can be seen from FIG. If the switch SL is switched on in the second commutation path 2, the switch S H in the first commutation path 1 is switched off. As soon as the switch S L is turned on, an electric current i L to be measured, which flows through the coil winding L and the current transformer 6, rises linearly. The current i L is detected by the current transformer 6 and provided as a measuring signal, in particular measuring voltage signal U, an input of the observer module 4 available. As can be seen from FIG.
  • the current transformer 6 is integrated in a current detection device 7, which has, in addition to the current transformer 6, a rectifier bridge circuit 8, a switching unit 9 for the selective connection of a rectifier bridge path of the rectifier bridge circuit 8 and a load resistor RB.
  • the measuring voltage UM drops at the load resistor RB.
  • the switch positions Si, S 2 of the switching unit 9 are dependent on the current direction i L to be measured. Both are therefore switched over in a complementary manner as soon as the sign of the current to be measured ii_ changes. As a result, the voltage measurement signal UM is unipolar, in the present embodiment exclusively positive.
  • a voltage drop u L at the coil winding L which corresponds to the product of the proportionality factor Ki and the input voltage Ui, is applied to a further input of the observer module 4.
  • the output voltage u 0 is fed via a switch S 3 to the input of the controller 12, which is formed in the present embodiment as a PI controller with an operational amplifier, the resistors RRI, RR 2 and capacitor C R.
  • the measurement voltage u M is applied at the other input of the controller 12.
  • the regulator voltage u R applied on the output side of the regulator 12 is fed to the one input of the multiplier 0.
  • the observer module 4 uses the height and the sign of the coil voltage u L to adapt the output voltage uo to the measuring voltage UM. As a result, the observer module 4 is calibrated adaptively as long as the output voltage u 0 is not equal to the measurement voltage u M.
  • the controller 12 is formed by the switch S3 as an interruptible controller with integrating portion.
  • the controller 12 evaluates the voltage difference between the output voltage u 0 of the integrator 11 and the measurement voltage u M.
  • the switch S 3 is turned on as soon as the measuring voltage UM is not equal to zero.
  • the control difference (UM - u 0 ) is amplified by the controller 12 and fed back to the multiplier 10 via the output voltage u R. If the control difference, for example, positive, the output voltage increases u 0 and amplified by multiplication with the coil voltage u L, the input voltage us at the integrator 11. This increases the output voltage U 0 faster until it is equal to the measurement voltage u M. Then the output voltage u 0 of the observer module 4 follows exactly the scaled current K 2 x ii_. The observer module 4 is calibrated with it.
  • the measurement voltage U jumps to the value zero.
  • the control difference (u M - u 0 ) has the value 0.
  • the output voltage uo remains at the same voltage value as before the switching time tu.
  • the voltage UL on the coil winding L changes, since the gradient of the measuring voltage UM and the output voltage before the switching time tu were the same.
  • the scaled current K 2 IL decreases to the same extent as the output voltage u 0 .
  • the slope of the output voltage u 0 thus corresponds in magnitude to the slope of the output voltage u 0 before the switching time tu.
  • the output voltage u 0 has a constant positive gradient in the conducting state of the second commutation path 2 in the present exemplary embodiment and a constant negative gradient in the transmitted state of the first commutation path 1, which are equal in magnitude.
  • the current i L to be measured is thus estimated.
  • the complete course of the output voltage Uo during the passage state of the first commutation path 1 and of the second commutation path 2 corresponds to the total current ii_ to be measured.
  • K 2 The proportionality factors Ki and K 2 are linearly dependent on each other. K 2 can be derived from the following equation which applies to the switching time tu of the half-bridge circuit:
  • the regulator voltage u R is constant both in the pass-through state of the first commutation path 1 and in the second commutation path 2.
  • the multiplying voltage us jumps to a negative value after the switching time tu.
  • the current measuring device is based on the idea that, during the passage state of a commutation path 1, the current I L is measured. sen and during the passage state of the second Kommut ists- path 2 is estimated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un dispositif de mesure du courant destiné à mesurer un courant électrique dans un conducteur d'un dispositif électronique de puissance, en particulier d'un convertisseur électronique de puissance régulé, doté d'un transformateur de courant (6) associé au conducteur, le dispositif de mesure de courant comprenant une unité de détection de courant (3) qui comporte un enroulement d'amplificateur, lequel est associé au conducteur de courant conduisant le courant à mesurer pour déterminer une tension de bobine représentant le courant à mesurer ; ladite unité de détection de courant comporte le transformateur de courant, lequel est disposé dans une deuxième voie de commutation (2) pour déterminer une tension de mesure représentant le courant à mesurer et présentant une première pente ; ladite unité de détection de courant comporte un module d'observation (4), auquel, côté entrée, s'appliquent la tension de mesure et la tension de bobine, et elle est conçue de telle sorte que l'allure d'un signal de sortie du module d'observation, dans un état de passage de la deuxième voie de commutation, correspond à l'allure de la tension de mesure et, dans un état de passage de la première voie de commutation (1), correspond à l'allure d'un signal d'estimation, le signal d'estimation étant formé par prolongement de la courbe de la tension de mesure avec une deuxième pente dont la valeur est égale à la première pente, mais négative.
PCT/DE2017/100979 2016-12-06 2017-11-16 Dispositif de mesure du courant ainsi que procédé de mesure d'un courant électrique dans un conducteur WO2018103781A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17825730.9A EP3552029A1 (fr) 2016-12-06 2017-11-16 Dispositif de mesure du courant ainsi que procédé de mesure d'un courant électrique dans un conducteur
CN201780075776.1A CN110114684B (zh) 2016-12-06 2017-11-16 用于测量导电体中的电流的电流测量装置和方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016123515.6A DE102016123515B4 (de) 2016-12-06 2016-12-06 Strommesseinrichtung sowie Verfahren zur Messung eines elektrischen Stromes in einem Stromleiter
DE102016123515.6 2016-12-06

Publications (1)

Publication Number Publication Date
WO2018103781A1 true WO2018103781A1 (fr) 2018-06-14

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PCT/DE2017/100979 WO2018103781A1 (fr) 2016-12-06 2017-11-16 Dispositif de mesure du courant ainsi que procédé de mesure d'un courant électrique dans un conducteur

Country Status (4)

Country Link
EP (1) EP3552029A1 (fr)
CN (1) CN110114684B (fr)
DE (1) DE102016123515B4 (fr)
WO (1) WO2018103781A1 (fr)

Citations (9)

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Publication number Priority date Publication date Assignee Title
EP0687057A1 (fr) * 1994-06-09 1995-12-13 AT&T Corp. Dispositif isolé de détection de courant pour redresseur à facteur de puissance élevé
EP1580563A1 (fr) 2004-03-23 2005-09-28 Siemens Aktiengesellschaft Dispositif pour la mesure sans potentiel de courants
US20090174393A1 (en) * 2008-01-08 2009-07-09 International Business Machines Corporation Apparatus, system, and method determining voltage, current, and power in a switching regulator
GB2472111A (en) * 2009-07-22 2011-01-26 Wolfson Microelectronics Plc Control of DC-DC converters in valley current mode
EP2824464A1 (fr) 2013-07-10 2015-01-14 Dr. Johannes Heidenhain GmbH Procédé et dispositif destinés à mesurer le courant dans un convertisseur
US20150222171A1 (en) * 2014-01-31 2015-08-06 Monolithic Power Systems, Inc. Current detection and emulation circuit, and method thereof
WO2015161634A1 (fr) * 2014-04-22 2015-10-29 中兴通讯股份有限公司 Procédé et dispositif de détection de courant d'inducteur de circuit pfc
DE102015200654A1 (de) 2015-01-16 2016-07-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren zur Kompensation parasitärer Induktivitäten in Strommesswiderständen
DE102015211966A1 (de) * 2015-04-17 2016-10-20 Dialog Semiconductor (Uk) Limited Steuerschema für Hysterese-Abwärts-Controller mit Induktionsspulen-Stromschätzung

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US5982160A (en) * 1998-12-24 1999-11-09 Harris Corporation DC-to-DC converter with inductor current sensing and related methods
JP4811674B2 (ja) * 2006-01-17 2011-11-09 株式会社安川電機 単相用出力インバータ装置とその出力電流検出方法
GB2439998A (en) * 2006-07-07 2008-01-16 Cambridge Semiconductor Ltd Estimating the output current of a switch mode power supply
US8314606B2 (en) * 2009-11-17 2012-11-20 Renesas Electronics America Inc. Current sensing and measuring method and apparatus
SE539852C2 (sv) * 2012-12-19 2017-12-19 Comsys Ab Symmetrisk krets
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US9748843B2 (en) * 2014-09-24 2017-08-29 Linear Technology Corporation DCR inductor current-sensing in four-switch buck-boost converters
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Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687057A1 (fr) * 1994-06-09 1995-12-13 AT&T Corp. Dispositif isolé de détection de courant pour redresseur à facteur de puissance élevé
EP1580563A1 (fr) 2004-03-23 2005-09-28 Siemens Aktiengesellschaft Dispositif pour la mesure sans potentiel de courants
US20090174393A1 (en) * 2008-01-08 2009-07-09 International Business Machines Corporation Apparatus, system, and method determining voltage, current, and power in a switching regulator
GB2472111A (en) * 2009-07-22 2011-01-26 Wolfson Microelectronics Plc Control of DC-DC converters in valley current mode
EP2824464A1 (fr) 2013-07-10 2015-01-14 Dr. Johannes Heidenhain GmbH Procédé et dispositif destinés à mesurer le courant dans un convertisseur
US20150222171A1 (en) * 2014-01-31 2015-08-06 Monolithic Power Systems, Inc. Current detection and emulation circuit, and method thereof
WO2015161634A1 (fr) * 2014-04-22 2015-10-29 中兴通讯股份有限公司 Procédé et dispositif de détection de courant d'inducteur de circuit pfc
DE102015200654A1 (de) 2015-01-16 2016-07-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren zur Kompensation parasitärer Induktivitäten in Strommesswiderständen
DE102015211966A1 (de) * 2015-04-17 2016-10-20 Dialog Semiconductor (Uk) Limited Steuerschema für Hysterese-Abwärts-Controller mit Induktionsspulen-Stromschätzung

Also Published As

Publication number Publication date
CN110114684B (zh) 2021-10-22
CN110114684A (zh) 2019-08-09
DE102016123515B4 (de) 2019-02-07
EP3552029A1 (fr) 2019-10-16
DE102016123515A1 (de) 2018-06-07

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