DE102020004825A1 - Device and method for compensating for leakage currents when charging an electrical energy store - Google Patents
Device and method for compensating for leakage currents when charging an electrical energy store Download PDFInfo
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- DE102020004825A1 DE102020004825A1 DE102020004825.0A DE102020004825A DE102020004825A1 DE 102020004825 A1 DE102020004825 A1 DE 102020004825A1 DE 102020004825 A DE102020004825 A DE 102020004825A DE 102020004825 A1 DE102020004825 A1 DE 102020004825A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/337—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers avoiding disconnection due to reactive fault currents
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- 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
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- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Die vorliegende Erfindung betrifft eine Vorrichtung und ein Verfahren zur Kompensation von Ableitströmen beim Laden eines elektrischen Energiespeichers mit einem durch ein ein- oder mehrphasiges Wechselstromnetz gespeisten Ladesteuergerät, wobei auf die Erfassung und Messung von Fehlerströmen verzichtet werden kann. Die erfindungsgemäße Vorrichtung sowie das erfindungsgemäße Verfahren grenzen sich vom Stand der Technik insbesondere dadurch ab, dass sowohl die Messung als auch die Kompensation von Ableitströmen auf der Gleichspannungsseite des Ladesystems erfolgen. Dazu wird auf der Gleichstromseite des Ladesteuergeräts ein Differenzstromsignal zumindest zweier Gleichstromleitungen erfasst und darauf basierend ein Kompensationssignal erzeugt, welches verstärkt und in die Gleichstromleitungen eingekoppelt wird.The present invention relates to a device and a method for compensating for leakage currents when charging an electrical energy storage device with a charging control device fed by a single-phase or multi-phase AC network, it being possible to dispense with the detection and measurement of fault currents. The device according to the invention and the method according to the invention differ from the prior art in particular in that both the measurement and the compensation of leakage currents take place on the DC voltage side of the charging system. For this purpose, a differential current signal of at least two DC lines is detected on the DC side of the charging control device and a compensation signal is generated based thereon, which is amplified and coupled into the DC lines.
Description
Die vorliegende Erfindung betrifft eine Vorrichtung und ein Verfahren zur Kompensation von Ableitströmen beim Laden eines elektrischen Energiespeichers mit einem durch ein ein- oder mehrphasiges Wechselstromnetz gespeisten Ladesteuergerät.The present invention relates to a device and a method for compensating for leakage currents when charging an electrical energy store with a charging control device fed by a single-phase or multi-phase AC network.
Die Erfindung betrifft insbesondere die Kompensation von systembedingten Ableitströmen während des Ladens eines Energiespeichers, wie z.B. einer elektrischen Traktionsbatterie eines elektrischen oder hybriden Fahrzeugs in sämtlichen weltweit anzutreffenden Netzsituationen wie z.B. in Europa, Nordamerika oder Asien sowie für Ladesysteme mit einer, zwei oder drei elektrischen Phasen. Die erfindungsgemäße Vorrichtung sowie das Verfahren ermöglichen die Kompensation der Ableitströme nahe an Ihrem Entstehungsort auf der Gleichspannungsseite des Ladegeräts und beschränken sich dabei auf die bloße Kompensation solcher Ableitströme, welche an Ableitkapazitäten zwischen den spannungsführenden Teilen des Ladekreises und dem Erdleiter auftreten. Das erfindungsgemäße Konzept verhindert somit technisch die nicht zulässige Kompensation von Fehlerströmen und greift nicht in ein im Fehlerfall etwa geltendes Sicherheitskonzept auf der Netzniederspannungsseite, also z.B. Fl-Schalter oder dergleichen, ein.The invention relates in particular to the compensation of system-related leakage currents during the charging of an energy store, such as an electric traction battery of an electric or hybrid vehicle in all network situations found worldwide, such as in Europe, North America or Asia, as well as for charging systems with one, two or three electrical phases. The device according to the invention and the method enable the compensation of the leakage currents close to their point of origin on the DC voltage side of the charger and are limited to the mere compensation of such leakage currents that occur at leakage capacitances between the live parts of the charging circuit and the ground conductor. The concept according to the invention thus technically prevents the impermissible compensation of fault currents and does not intervene in a safety concept that may apply in the event of a fault on the low-voltage side of the mains, e.g. FI switches or the like.
Die Detektion von Fehler- und Ableitströmen sowie die Kompensation von Ableitströmen werden z.B. in der Photovoltaik, in der Haustechnik oder im Industriebereich eingesetzt.The detection of fault and leakage currents as well as the compensation of leakage currents are used, for example, in photovoltaics, in building services or in the industrial sector.
Die Offenlegung
Sehr ähnlich dazu beschreibt die
In der
Weitere Verfahren zur Erhöhung der Ladeverfügbarkeit durch Messung des Differenzstroms und Detektion und Kompensation von Wechsel- oder Gleichstromkomponente von Ableit- und Fehlerströmen bei einphasigem Laden auf der Wechselspannungsseite des Ladesystems zeigen
Die erfindungsgemäß vorgeschlagene Vorrichtung sowie das erfindungsgemäße Verfahren ermöglichen es, im Rahmen der Ableitstromkompensation auf die Erfassung und Messung von Fehlerströmen zu verzichten. Dies führt zu einer geringeren Komplexität des Konzeptes zur Ableitstromkompensation und zu einer Steigerung der elektrischen Sicherheit insgesamt. Durch die daraus resultierende Unberührtheit der Fehlerströme können und müssen diese fehlerfrei vom Fehlerstrom-Schutzschalter erkannt und abgeschaltet werden, welcher netzseitig, als Teil einer Ladestation oder integriert in das Ladegerät in entsprechend notwendiger Güte ausgeführt sein muss.The device proposed according to the invention and the method according to the invention make it possible to dispense with the detection and measurement of fault currents in the context of leakage current compensation. This reduces the complexity of the leakage current compensation concept and increases overall electrical safety. Due to the resulting unaffectedness of the residual currents, they can and must be correctly detected and switched off by the residual current circuit breaker, which must be implemented on the mains side, as part of a charging station or integrated into the charging device with the required quality.
Dies wird hinsichtlich der Vorrichtung dadurch erreicht, dass der Summenstromwandler auf der Gleichstromseite des Ladesteuergeräts zur Erfassung eines Differenzstroms zumindest zweier Gleichstromleitungen angeordnet ist, und dass die Einrichtung zur Einkopplung des Kompensationssignals zur Einkopplung des Kompensationssignals in die Gleichstromleitungen ausgebildet ist.With regard to the device, this is achieved in that the summation current transformer is arranged on the DC side of the charging control device for detecting a differential current of at least two DC lines, and that the device for coupling the compensation signal is designed for coupling the compensation signal into the DC lines.
Bezüglich des Verfahrens gelingt dies erfindungsgemäß dadurch, dass auf der Gleichstromseite des Ladesteuergeräts ein Differenzstromsignal der beiden Gleichstromleitungen erfasst wird, dass das Differenzstromsignal gefiltert und aus dem gefilterten Signal ein demselben in Amplitude und Phasengang entgegengesetztes Kompensationssignal erzeugt wird, welches verstärkt und in die beiden Gleichstromleitungen eingekoppelt wird.With regard to the method, this is achieved according to the invention in that a differential current signal of the two DC lines is detected on the DC side of the charging control device, that the differential current signal is filtered and a compensation signal that is opposite in amplitude and phase response is generated from the filtered signal, which is amplified and coupled into the two DC lines will.
Die erfindungsgemäße Vorrichtung sowie das erfindungsgemäße Verfahren grenzen sich von dem beschriebenen Stand der Technik insbesondere dadurch ab, dass sowohl die Messung als auch die Kompensation von Ableitströmen auf der Gleichspannungsseite des Ladesystems erfolgen.The device according to the invention and the method according to the invention differ from the described prior art in particular in that both the measurement and the compensation of leakage currents take place on the DC voltage side of the charging system.
Vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Vorrichtung und des Verfahrens ergeben sich aus den jeweiligen Unteransprüchen und werden anhand der Zeichnung erläutert.Advantageous refinements and developments of the device and the method according to the invention result from the respective dependent claims and are explained with reference to the drawing.
Es zeigen:
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1 Ein Blockschaltbild eines Ladestrangs eines elektrischen Energiespeichers mit einer erfindungsgemäßen Vorrichtung -
2 Ein Blockschaltbild einer erfindungsgemäß ausgebildeten Vorrichtung -
3 Einen Summenstromwandler als Differenzstromwandler -
4 Ein Prinzipschaltbild einer erfindungsgemäßen Vorrichtung
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1 A block diagram of a charging train of an electrical energy storage device with a device according to the invention -
2 A block diagram of a device designed according to the invention -
3 A summation current transformer as a residual current transformer -
4 A basic circuit diagram of a device according to the invention
Wie aus dem Blockschaltbild in
Die Vorrichtung 3.4 zur Kompensation von Ableitströmen kann dabei entweder, wie in
Im Falle des in
Die erfindungsgemäße Vorrichtung 3.4 zur Kompensation von Ableitströmen umfasst, wie weiter in dem Blockschaltbild in
Der Summenstromwandler 4 wird, wie in
Wie auch aus dem in
Aus diesem resultierenden gefilterten Signal wird mittels einer im Wesentlichen einen Differenzverstärker ausbildenden Schaltung 6 zur Erzeugung eines Kompensationssignals ein in Amplitude und Phasengang dem gefilterten Signal entgegengesetzt gerichtetes Kompensationssignal generiert. Dieses Kompensationssignal wird dann in einem Hochvoltverstärker 7 zu einer Spannung mit einer Amplitude von ca. 200 V verstärkt und als Kompensationsstrom über eine geeignete Einrichtung 8 zur Einkopplung in den Hochspannungs-Gleichstromteil injiziert, um dort den zuvor über den Summenstromwandler 4 erfassten und entgegengesetzt gerichteten, aber im Betrag gleichen Ableitstrom auszulöschen.From this resulting filtered signal, a compensation signal directed in the opposite direction to the filtered signal in terms of amplitude and phase response is generated by means of a
Der gesamte Hochvoltverstärker 7 wird vorzugsweise aus diskreten Bauteilen aufgebaut, da kommerzielle integrierte Bausteine für diesen Spannungsbereich kaum verfügbar sind. Ein solcher, auch unter der Bezeichnung „Quasi Class AB“ bekannter Verstärker zeichnet sich dadurch aus, dass für die beiden Leistungstransistoren NPN-Typen verwendet werden können, die im Hochvoltbereich einfacher zu beschaffen sind. Für eine adäquate Kompensation der über die Erdungsleitung PE des Ladesteuergeräts 3 fließenden Ableitströme muss die Masseleitung des Verstärkers mit dieser Erdungsleitung PE verbunden werden. Der Hochvoltverstärker 7 kann erforderlichenfalls auf seiner Ausgangsseite einen NF-Transformator aufweisen.The entire high-
Die Einrichtung 8 zur Einkopplung des Kompensationssignals besteht im Wesentlichen aus mindestens zwei Koppelkondensatoren CK+ und CK-, die von dem Hochvoltverstärker 7 symmetrisch am Mittelpunkt jeweils gegen die Gleichstromleitungen DC+ und DC- gespeist werden. Der Hochvoltverstärker 7 stützt sich dabei gegen das Potential der Erdungsleitung PE ab, damit ein Stromfluss von den Koppelkondensatoren CK+ und CK- über die komplexe Impedanz ZDC+ und ZDC- des gesamten Gleichspannungskreises gegenüber dem Potential der Erdungsleitung PE aufgebracht werden kann. Die Kapazitäten der Koppelkondensatoren CK+ und CK- müssen dabei ausreichend groß gewählt, damit der resultierende Blindwiderstand noch einen Stromfluss im niedrigsten Frequenzbereich zulässt. Andererseits sollen die Kapazitäten der Koppelkondensatoren CK+ und CK- aber auch nicht größer als nötig sein, um Bauraum, Kosten und dielektrische Verluste möglichst gering zu halten. Die Koppelkondensatoren CK+ und CK- können auch jeweils aus einer Parallel- und/oder Reihenschaltung mehrerer einzelner Kondensatoren bestehen.The
Das unter Verwendung der erfindungsgemäßen Vorrichtung 3.4 durchgeführte, ebenfalls erfindungsgemäße Verfahren zur Kompensation von Ableitströmen misst und kompensiert Ströme im Hochspannungs-Gleichstromteil innerhalb des Ladesteuergeräts 3 oder zwischen Ladesteuergerät 3 und elektrischem Energiespeicher 1. Im Hochspannungs-Gleichstromteil haben alle auftretenden Fehlerströme auch einen Gleichanteil, während alle zu kompensierenden Ableitströme als transiente, meist alternierende Ströme vorhanden sind. Mit dem für das erfindungsgemäße Verfahren genutzten Summenstromwandler 4 können physikalisch keine Gleichströme gemessen werden. Folglich besteht der Großteil an gemessenen Strömen aus Ableitströmen. Da Gleichströme mit der erfindungsgemäßen Vorrichtung 3.4 nicht gemessen werden können, können sie konsequenterweise auch durch das erfindungsgemäße Verfahren nicht unbeabsichtigt kompensiert werden.The method for compensating leakage currents carried out using the device 3.4 according to the invention, which is also according to the invention, measures and compensates for currents in the high-voltage direct current part within the
Nichtlinearitäten und Temperaturdrift im Hochvoltverstärker 7 können mit Hilfe einer lokalen Rückkoppelschleife 11 kompensiert werden. Da die Last am Hochvoltverstärker 7 stark kapazitiv ist, wird hierzu eine Strommessung benötigt, die beispielweise über eine Spannungsmessung an einem Shunt 12 realisiert werden kann, wobei das Messsignal mit Hilfe eines Differenzverstärkers 13 auf den Eingang des Hochvoltverstärkers 7 zurückgeführt wird.Non-linearities and temperature drift in the high-
Als Alternative zu dieser Vorgehensweise könnte zur Bildung einer Rückkoppelschleife auch der erzeugte Kompensationsstrom mittels einer weiteren Leitung durch den Ringkern 9 des Summenstromwandlers 4 geführt werden.As an alternative to this procedure, the compensation current generated could also be routed through the
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent Literature Cited
- DE 102015101870 A1 [0004]DE 102015101870 A1 [0004]
- EP 2372858 A2 [0005]EP 2372858 A2 [0005]
- US 2010295508 A1 [0006]US2010295508A1 [0006]
- US 20120249067 A1 [0007]US20120249067A1 [0007]
- DE 102012205038 A1 [0007]DE 102012205038 A1 [0007]
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DE102020004825.0A DE102020004825A1 (en) | 2020-08-07 | 2020-08-07 | Device and method for compensating for leakage currents when charging an electrical energy store |
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DE102020004825.0A DE102020004825A1 (en) | 2020-08-07 | 2020-08-07 | Device and method for compensating for leakage currents when charging an electrical energy store |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20100295508A1 (en) | 2009-05-22 | 2010-11-25 | Lear Corporation | Apparatus and method for balancing the transfer of electrical energy from an external power source to a vehicle |
EP2372858A2 (en) | 2010-04-01 | 2011-10-05 | Doepke Schaltgeräte GmbH & Co. KG | Method for compensating capacitive leakage currents and device for residual current protection or monitoring |
DE102012205038A1 (en) | 2011-03-31 | 2012-10-04 | Lear Corp. | Device for correcting a DC bias for leakage current |
DE102015101870A1 (en) | 2014-02-11 | 2015-08-13 | Sma Solar Technology Ag | Method for compensating a portion of a differential current flowing via a leakage capacitance and suitable inverters for carrying out the method |
-
2020
- 2020-08-07 DE DE102020004825.0A patent/DE102020004825A1/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20100295508A1 (en) | 2009-05-22 | 2010-11-25 | Lear Corporation | Apparatus and method for balancing the transfer of electrical energy from an external power source to a vehicle |
EP2372858A2 (en) | 2010-04-01 | 2011-10-05 | Doepke Schaltgeräte GmbH & Co. KG | Method for compensating capacitive leakage currents and device for residual current protection or monitoring |
DE102012205038A1 (en) | 2011-03-31 | 2012-10-04 | Lear Corp. | Device for correcting a DC bias for leakage current |
US20120249067A1 (en) | 2011-03-31 | 2012-10-04 | Lear Corporation | Apparatus for correcting a dc bias for leakage current |
DE102015101870A1 (en) | 2014-02-11 | 2015-08-13 | Sma Solar Technology Ag | Method for compensating a portion of a differential current flowing via a leakage capacitance and suitable inverters for carrying out the method |
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