EP2416982A1 - Transmission of power bidirectionally and without contact to charge electric vehicles - Google Patents

Transmission of power bidirectionally and without contact to charge electric vehicles

Info

Publication number
EP2416982A1
EP2416982A1 EP10717571A EP10717571A EP2416982A1 EP 2416982 A1 EP2416982 A1 EP 2416982A1 EP 10717571 A EP10717571 A EP 10717571A EP 10717571 A EP10717571 A EP 10717571A EP 2416982 A1 EP2416982 A1 EP 2416982A1
Authority
EP
European Patent Office
Prior art keywords
converter
inverter
voltage
storage device
vehicle
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Withdrawn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
EP10717571A
Other languages
German (de)
French (fr)
Inventor
Ralf Cordes
Gerd Griepentrog
Thomas Komma
Sebastian Nielebock
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.)
Siemens AG
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
Publication of EP2416982A1 publication Critical patent/EP2416982A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
    • 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
    • B60L53/12—Inductive energy transfer
    • B60L53/122—Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
    • 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
    • B60L53/20—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 converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • 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
    • B60L53/20—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 converters located in the vehicle
    • B60L53/24—Using the vehicle's propulsion converter for charging
    • 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
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • 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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y02T10/64—Electric machine technologies in electromobility
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/126—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Definitions

  • Electric vehicles are usually connected by connectors to the grid or a stationary charging rectifier. If a battery of 20 kWh is to be charged within 15 minutes (so-called 6C charge), charging power of approximately 87 kW is assumed, which corresponds to a current of 125 A on the 400 V mains. This corresponds to the largest, commercially available plug with a diameter of 126 mm and a length of 282 mm. The manual forces required for insertion and removal are some 100 N, which makes operation considerably more difficult. Even higher charging power can not be transmitted with plug systems available today. Added to this is the susceptibility of plug systems against contamination or an increased contact resistance as a result of corrosion with a corresponding risk of overheating. An alternative that avoids these problems is the non-contact transmission of energy to the vehicle.
  • the object underlying the invention is to provide a device for the non-contact transmission of power for charging electric vehicles, which has a simplified structure. Another object is to provide an improved charging method for an energy storage device of an electric vehicle.
  • a converter which can be connected on the input side to the energy storage device, configured to convert an input-side DC voltage into an output-side single-phase or multi-phase AC voltage and to convert an output-side single- or multi-phase AC voltage into an input DC voltage, a coil arrangement for the inductive Transmission of electrical energy,
  • a first switching device provided on the output side of the converter for connecting the converter to the electric drive and a second switching device provided on the output side of the converter for connecting the converter to the coil arrangement are provided.
  • the converter which is present anyway in the electrically operated vehicle is also advantageously used for the inductive transmission of electrical energy and charging of the battery.
  • the converter is connected to the vehicle engine by means of the first switching device and separated from the transformer by the second switching device.
  • Conveniently converters for controlling electrical machines are constructed as hard-switching converter circuits which commutate the motor current within a half-bridge between the two semiconductor switches, for example IGBTs, or the associated freewheeling diodes.
  • the switching frequency of such drive converter set in the kHz range, in particular to about 8 to 10 kHz.
  • the switching losses are approximately at the losses caused by the power line in the semiconductors. Since the transmittable power of an inductive energy transmission is proportional to the frequency for a given cross-section of the flux-carrying components (iron circle, ferrites, etc.), the largest possible transmission frequency should be selected.
  • frequencies between 20 and 30 kHz are used for the inductive energy transmission, with ferrite then being used to guide the flow. If the inverter at about 3 times the switching frequency compared to the operation of the electric motor to turn the approximately equal to current, then a total of about twice the losses would occur, resulting in a thermal overload of the power semiconductors.
  • a resonant circuit is advantageously indicated for the inductive energy transmission, in that the leakage inductance of the coil arrangement is resonantly tuned by a serially arranged capacitance.
  • the load current can advantageously be switched in each case at the zero crossing. Only the magnetizing current of the coil arrangement must be commutated hard.
  • the resonant circuit formed by stray inductors and resonant capacitor is excited by the inverter with a rectangular voltage of a frequency corresponding to the resonant frequency.
  • the resonant capacitors may alternatively be provided on both sides of the transformer or only on one side of the transformer. If only one resonance capacitor is used, this can be arranged on the vehicle side or on the side of the charging station.
  • the transformer which takes over the non-contact transmission of the energy and comprises the coil arrangement, can be designed as a single-phase or as a three-phase transformer.
  • the inverter has three half-bridges, two of which are connected on the output side to the second switching device, while the third is connectable to the energy storage device via a DC-DC converter.
  • the inverter has four half-bridges, three of which are connected on the output side to the second switching device, while the fourth is connectable to the energy storage device via a DC-DC converter.
  • Figure 1 shows a first embodiment with single-phase
  • Figure 2 shows a second embodiment with a single-phase
  • Figure 3 shows a third embodiment variant with single-phase
  • Figure 4 shows a fourth embodiment with three-phase transformer and DC-DC converter between battery and inverter.
  • FIG. 1 shows a first overall system 10 which consists of vehicle-side elements 12 and of stationary elements 11 and comprises a first exemplary embodiment of the invention.
  • the stationary elements 11 are located outside the vehicle, for example below the vehicle when it is at a charging station.
  • the vehicle-side elements 12 comprise an electric motor 13 for driving the vehicle, a battery 14, an inverter 18, an intermediate circuit capacitor 22, a first switching arrangement 15, a second switching arrangement 16, a coil arrangement 17 as the vehicle-side part of a transformer 21 and a vehicle-side resonance capacitor 19th
  • the stationary elements 11 comprise a rectifier 23, a stationary-side intermediate circuit capacitor 24 and a stationary-side converter 25. Furthermore, the stationary elements 11 comprise a stationary-side resonance capacitor 20 and the stationary-side part of the transformer 21.
  • the rectifier 23 converts the three negligent voltage of the supply network into a DC voltage, which is converted by the stationary-side wrong of 25 a suitable AC voltage.
  • the transformer 21 ensures a transfer of the AC voltage in the vehicle-side circuit for this purpose, the connection of the judge 18 to the transformer 21 by the second switch assembly 16 is made. At the same time, the connection between the order judge 18 and the electric motor 13 by means of the first switch assembly 15 is interrupted.
  • the DC intermediate circuit that is to say the intermediate circuit capacitor 22 of the converter 18, is connected essentially directly to the battery 14 during the charging process.
  • the DC link voltage level of the inverter 18 is determined by the state of charge of the battery 14.
  • the vehicle transmits by radio or also by inductive or capacitive transmission the desired charging power, which may also be negative, to the stationary-side converter 25 and its controller. This then adapts the power flow to the desired value by tracking the setpoint value for its DC link voltage.
  • the resonance capacitors 19, 20 are matched to the transformer 21 in such a way that a resonant circuit frequency of 25 kHz results.
  • the switching frequency of the inverter 18 for the motor operation is 10 kHz in this example.
  • FIG. 2 shows a second overall system 30 with a second exemplary embodiment of the invention.
  • the vehicle-side converter comprises 31 two instead of three half-bridges.
  • 31 Schottky diodes 32 are arranged parallel to the semiconductor switches of the inverter.
  • no resonance capacitor 19 is used on the vehicle side.
  • the inverter 31 can be switched to passive and the parallel Schottky diodes 32 can be used as a passive rectifier. As a result, the forward losses of the converter 31 are reduced. This ensures reliable charging operation of the battery 14
  • This variant can be realized both with a single-phase and with a three-phase transformer 21, 73.
  • both converters suitably switch completely synchronously. This can be realized, for example, with an additional unloaded winding or a current transformer.
  • FIG. 3 shows a third overall system 50 with a third embodiment of the invention.
  • the vehicle-side converter 18 has three half-bridges.
  • a DC-DC converter 51 is provided between a connection of the battery 14 and the converter 18.
  • the regulation of the power flow takes place by adjusting the voltage of the DC intermediate circuits of the two power converters as follows:
  • the third half bridge in the vehicle is used in this case to the battery 14 with the intermediate circuit on to connect a bidirectional buck-boost converter, the DC-DC converter 51, wherein an additional actuator throttle is necessary.
  • the DC link voltage of the vehicle-side converter 18 is increased to a level above the end-of-charge voltage of the battery 14.
  • the power flow control is then carried out by slightly changing the DC link voltage in the vehicle-side converter 18 by the power drain from the DC link to the battery 14 is controlled accordingly. If less power is supplied to the battery, the voltage in the DC link automatically increases, which alters the voltage ratio between the stationary side and the vehicle side, which in turn reduces the transmitted power.
  • FIG. 4 shows a fourth overall system 70 with a fourth exemplary embodiment of the invention.
  • a three-phase transformer 73 is used in the fourth embodiment.
  • the resonance tuning also takes place on the vehicle side by means of three resonance capacitors 74 on the vehicle.
  • three half-bridges each are necessary both stationary and on the vehicle side.
  • a fourth half-bridge is provided on the vehicle side, which takes over the functionality of the DC-DC converter 76 and connects the battery 14 to the intermediate circuit of the vehicle-side converter 71.
  • This fourth half-bridge can alternatively be used as a protection module in normal driving mode, that is to say when the converter 71 feeds a permanent magnet-excited synchronous machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a device for transmitting power without contact to charge electric vehicles. The converter that feeds the electric drive and is present anyway in an electric vehicle also is used for transmitting energy to the vehicle without contact. For this purpose, a resonant operation is proposed for the inductive transmission of energy. The leakage inductance of the transformer is resonantly adjusted therefor by means of a serial capacitor. The load current is then switched at the zero-crossing.

Description

Beschreibungdescription
Bidirektionale und berührungsfreie Übertragung von Leistung zum Laden von ElektrofahrzeugenBidirectional and non-contact transmission of power for charging electric vehicles
Elektrofahrzeuge werden üblicherweise durch Steckverbinder an das Netz oder einen stationären Ladegleichrichter angeschlossen. Soll eine Batterie von 20 kWh innerhalb von 15 Minuten geladen werden (sog. 6C-Ladung) , so ist von Ladeleistungen von etwa 87 kW auszugehen, was am 400 V-Netz einem Strom von 125 A entspricht. Dies entspricht dem größten, kommerziell verfügbaren Stecker mit einem Durchmesser von 126 mm und einer Länge von 282 mm. Die zum Ein- und Ausstecken notwendigen manuellen Kräfte betragen einige 100 N, was eine Betätigung erheblich erschwert. Noch höhere Ladeleistungen können mit heute verfügbaren Steckersystemen nicht übertragen werden. Hinzu kommt die Anfälligkeit von Steckersystemen gegen Verschmutzung bzw. ein erhöhter Übergangswiderstand infolge von Korrosion mit entsprechender Gefahr der Überhitzung. Eine Al- ternative, die diese Probleme umgeht, besteht in einer berührungslosen Übertragung der Energie auf das Fahrzeug.Electric vehicles are usually connected by connectors to the grid or a stationary charging rectifier. If a battery of 20 kWh is to be charged within 15 minutes (so-called 6C charge), charging power of approximately 87 kW is assumed, which corresponds to a current of 125 A on the 400 V mains. This corresponds to the largest, commercially available plug with a diameter of 126 mm and a length of 282 mm. The manual forces required for insertion and removal are some 100 N, which makes operation considerably more difficult. Even higher charging power can not be transmitted with plug systems available today. Added to this is the susceptibility of plug systems against contamination or an increased contact resistance as a result of corrosion with a corresponding risk of overheating. An alternative that avoids these problems is the non-contact transmission of energy to the vehicle.
Die der Erfindung zugrundeliegende Aufgabe besteht in der Bereitstellung einer Vorrichtung für die berührungsfreie Über- tragung von Leistung zum Laden von Elektrofahrzeugen, die einen vereinfachten Aufbau aufweist. Eine weitere Aufgabe besteht in der Angabe eines verbesserten Ladeverfahrens für eine Energiespeichereinrichtung eines elektrisch betriebenen Fahrzeugs .The object underlying the invention is to provide a device for the non-contact transmission of power for charging electric vehicles, which has a simplified structure. Another object is to provide an improved charging method for an energy storage device of an electric vehicle.
Die Aufgabe wird durch eine Vorrichtung mit den Merkmalen von Anspruch 1 gelöst. Eine weitere Lösung besteht in dem Ladeverfahren mit den Merkmalen von Anspruch 7. Die abhängigen Ansprüche beziehen sich auf vorteilhafte Ausgestaltungen der Erfindung.The object is achieved by a device having the features of claim 1. Another solution is the charging method having the features of claim 7. The dependent claims relate to advantageous embodiments of the invention.
Die erfindungsgemäße Betriebsanordnung zur Verwendung in einem elektrisch betriebenen Fahrzeug, das wenigstens einen Elektroantrieb und wenigstens eine Energiespeichereinrichtung zur Speisung des Elektroantriebs mit elektrischer Energie aufweist, umfasst:The operating arrangement according to the invention for use in an electrically powered vehicle, the at least one Electric drive and at least one energy storage device for feeding the electric drive with electrical energy, comprising:
- einen Umrichter, der eingangsseitig mit der Energiespei- chereinrichtung verbindbar ist, ausgestaltet zur Wandlung einer eingangsseitigen Gleichspannung in eine ausgangssei- tige ein- oder mehrphasige Wechselspannung und zur Wandlung einer ausgangsseitige ein- oder mehrphasige Wechselspannung in eine eingangsseitigen Gleichspannung, - einer Spulenanordnung zur induktiven Übertragung elektrischer Energie,a converter which can be connected on the input side to the energy storage device, configured to convert an input-side DC voltage into an output-side single-phase or multi-phase AC voltage and to convert an output-side single- or multi-phase AC voltage into an input DC voltage, a coil arrangement for the inductive Transmission of electrical energy,
- eine seriell zur Spulenanordnung vorgesehene Kapazität zur ResonanzabStimmung .a capacitor provided in series with the coil arrangement for resonance tuning.
Bevorzugt sind eine ausgangsseitig des Umrichters vorgesehene erste Schalteinrichtung zum Verbinden des Umrichters mit dem Elektroantrieb und eine ausgangsseitig des Umrichters vorgesehene zweite Schalteinrichtung zum Verbinden des Umrichters mit der Spulenanordnung vorgesehen.Preferably, a first switching device provided on the output side of the converter for connecting the converter to the electric drive and a second switching device provided on the output side of the converter for connecting the converter to the coil arrangement are provided.
Vorteilhaft wird dabei der im elektrisch betriebenen Fahrzeug ohnehin vorhandene Umrichter also auch für die induktive Übertragung elektrischer Energie und Aufladung der Batterie verwendet. Dazu ist es zweckmäßig, den Umrichter mittels der ersten Schalteinrichtung vom Fahrzeugmotor zu trennen und mit der zweiten Schalteinrichtung mit dem Übertrager für die induktive Energieübertragung zu verbinden, wenn eine induktive Übertragung stattfinden soll. Zu anderen Zeiten wird der Umrichter mittels der ersten Schalteinrichtung mit dem Fahr- zeugmotor verbunden und mit der zweiten Schalteinrichtung vom Übertrager getrennt.In this case, the converter which is present anyway in the electrically operated vehicle is also advantageously used for the inductive transmission of electrical energy and charging of the battery. For this purpose, it is expedient to disconnect the inverter by means of the first switching device from the vehicle engine and to connect with the second switching device with the transformer for the inductive energy transmission, if an inductive transmission is to take place. At other times, the converter is connected to the vehicle engine by means of the first switching device and separated from the transformer by the second switching device.
Zweckmäßig werden Umrichter zur Ansteuerung von elektrischen Maschinen als hart schaltende Stromrichterschaltungen aufge- baut, die den Motorstrom innerhalb einer Halbbrücke zwischen den beiden Halbleiterschaltern, beispielsweise IGBTs, bzw. den zugeordneten Freilaufdioden kommutieren. Um die Schaltverluste zu reduzieren, wird die Schaltfrequenz solcher An- triebsstromrichter in den kHz-Bereich, insbesondere auf ca. 8 bis 10 kHz festgelegt. Damit liegen die Schaltverluste ungefähr bei den durch die Stromleitung in den Halbleitern verursachten Verlusten. Da die übertragbare Leistung einer induk- tiven Energieübertragung bei gegebenem Querschnitt der flussführenden Komponenten (Eisenkreis, Ferrite usw.) proportional zur Frequenz ist, sollte eine möglichst große Übertragungsfrequenz gewählt werden. Vorteilhaft werden für die induktive Energieübertragung Frequenzen zwischen 20 und 30 kHz genutzt, wobei zur Flussführung dann Ferrite eingesetzt werden. Wenn der Umrichter bei etwa 3-facher Schaltfrequenz gegenüber dem Betrieb des Elektromotors den etwa gleich Strom hart schalten soll, dann würden insgesamt etwa die doppelten Verluste auftreten, was zu einer thermischen Überlastung der Leistungs- halbleiter führt.Conveniently converters for controlling electrical machines are constructed as hard-switching converter circuits which commutate the motor current within a half-bridge between the two semiconductor switches, for example IGBTs, or the associated freewheeling diodes. To reduce the switching losses, the switching frequency of such drive converter set in the kHz range, in particular to about 8 to 10 kHz. Thus, the switching losses are approximately at the losses caused by the power line in the semiconductors. Since the transmittable power of an inductive energy transmission is proportional to the frequency for a given cross-section of the flux-carrying components (iron circle, ferrites, etc.), the largest possible transmission frequency should be selected. Advantageously, frequencies between 20 and 30 kHz are used for the inductive energy transmission, with ferrite then being used to guide the flow. If the inverter at about 3 times the switching frequency compared to the operation of the electric motor to turn the approximately equal to current, then a total of about twice the losses would occur, resulting in a thermal overload of the power semiconductors.
Daher wird vorteilhaft für die induktive Energieübertragung eine resonante Schaltung angegeben, indem die Streuinduktivität der Spulenanordnung durch eine seriell angeordnete Kapa- zität resonant abgestimmt wird. Dadurch kann vorteilhaft der Laststrom jeweils im Nulldurchgang geschaltet werden. Lediglich der Magnetisierungsstrom der Spulenanordnung muss hart kommutiert werden. Zweckmäßig wird der aus Streuinduktivitäten und Resonanzkondensator gebildete Schwingkreis durch den Umrichter mit einer rechteckförmigen Spannung einer Frequenz angeregt wird, die der Resonanzfrequenz entspricht.Therefore, a resonant circuit is advantageously indicated for the inductive energy transmission, in that the leakage inductance of the coil arrangement is resonantly tuned by a serially arranged capacitance. As a result, the load current can advantageously be switched in each case at the zero crossing. Only the magnetizing current of the coil arrangement must be commutated hard. Suitably, the resonant circuit formed by stray inductors and resonant capacitor is excited by the inverter with a rectangular voltage of a frequency corresponding to the resonant frequency.
Die Resonanzkondensatoren können alternativ auf beiden Seiten des Übertragers oder nur auf einer Seite des Übertragers vor- gesehen werden. Wird nur ein Resonanzkondensator verwendet, kann dieser fahrzeugseitig oder auf Seiten der Ladestation angeordnet sein.The resonant capacitors may alternatively be provided on both sides of the transformer or only on one side of the transformer. If only one resonance capacitor is used, this can be arranged on the vehicle side or on the side of the charging station.
Der Übertrager, der die berührungslose Übertragung der Ener- gie übernimmt und die Spulenanordnung umfasst, kann als einphasiger oder als dreiphasiger Übertrager ausgestaltet sein. Bevorzugt weist der Umrichter drei Halbbrücken auf, von denen zwei ausgangsseitig mit der zweiten Schalteinrichtung verbunden sind, während die dritte über einen DC-DC-Wandler mit der Energiespeichereinrichtung verbindbar ist. Alternativ weist der Umrichter vier Halbbrücken auf, von denen drei ausgangsseitig mit der zweiten Schalteinrichtung verbunden sind, während die vierte über einen DC-DC-Wandler mit der Energiespeichereinrichtung verbindbar ist.The transformer, which takes over the non-contact transmission of the energy and comprises the coil arrangement, can be designed as a single-phase or as a three-phase transformer. Preferably, the inverter has three half-bridges, two of which are connected on the output side to the second switching device, while the third is connectable to the energy storage device via a DC-DC converter. Alternatively, the inverter has four half-bridges, three of which are connected on the output side to the second switching device, while the fourth is connectable to the energy storage device via a DC-DC converter.
Bevorzugte, jedoch keinesfalls einschränkende Ausführungsbeispiele für die Erfindung werden nunmehr anhand der Zeichnung näher erläutert. Dabei sind die Merkmale schematisiert dargestellt und sich entsprechende Merkmale sind mit gleichen Bezugszeichen markiert. Die Figuren zeigen dabei im EinzelnenPreferred, but by no means limiting embodiments of the invention will now be explained in more detail with reference to the drawing. The features are shown schematically and corresponding features are marked with the same reference numerals. The figures show in detail
Figur 1 eine erste Ausführungsvariante mit einphasigemFigure 1 shows a first embodiment with single-phase
Übertrager,Exchanger,
Figur 2 eine zweite Ausführungsvariante mit einphasigemFigure 2 shows a second embodiment with a single-phase
Übertrager und einphasigem Umrichter (????), Figur 3 eine dritte Ausführungsvariante mit einphasigemTransformer and single-phase inverter (????), Figure 3 shows a third embodiment variant with single-phase
Übertrager und DC-DC-Wandler zwischen Batterie und Umrichter, Figur 4 eine vierte Ausführungsvariante mit dreiphasigem Übertrager und DC-DC-Wandler zwischen Batterie und Umrichter.Transformer and DC-DC converter between battery and inverter, Figure 4 shows a fourth embodiment with three-phase transformer and DC-DC converter between battery and inverter.
Figur 1 zeigt ein erstes Gesamtsystem 10, das aus fahrzeug- seitigen Elementen 12 und aus stationären Elementen 11 besteht und ein erstes Ausführungsbeispiel für die Erfindung umfasst. Die stationären Elemente 11 befinden sich außerhalb des Fahrzeugs, beispielsweise unterhalb des Fahrzeugs, wenn es sich bei einer Ladestation befindet.FIG. 1 shows a first overall system 10 which consists of vehicle-side elements 12 and of stationary elements 11 and comprises a first exemplary embodiment of the invention. The stationary elements 11 are located outside the vehicle, for example below the vehicle when it is at a charging station.
Die fahrzeugseitigen Elemente 12 umfassen einen Elektromotor 13 zum Antrieb des Fahrzeugs, eine Batterie 14, einen Umrichter 18, einen Zwischenkreiskondensator 22, eine erste Schalt- anordnung 15, eine zweite Schaltanordnung 16, eine Spulenanordnung 17 als fahrzeugseitigem Teil eines Übertragers 21 und einen fahrzeugseitigen Resonanzkondensator 19. Die stationären Elemente 11 umfassen einen Gleichrichter 23, einen stationärseitigen Zwischenkreiskondensator 24 und einen stationärseitigen Umrichter 25. Weiterhin umfassen die stationären Elemente 11 einen stationärseitigen Resonanzkondensa- tor 20 und den stationärseitigen Teil des Übertragers 21.The vehicle-side elements 12 comprise an electric motor 13 for driving the vehicle, a battery 14, an inverter 18, an intermediate circuit capacitor 22, a first switching arrangement 15, a second switching arrangement 16, a coil arrangement 17 as the vehicle-side part of a transformer 21 and a vehicle-side resonance capacitor 19th The stationary elements 11 comprise a rectifier 23, a stationary-side intermediate circuit capacitor 24 and a stationary-side converter 25. Furthermore, the stationary elements 11 comprise a stationary-side resonance capacitor 20 and the stationary-side part of the transformer 21.
Zur Aufladung der Batterie 14 des Fahrzeugs wandelt der Gleichrichter 23 die drei fahrlässige Spannung des Versorgungsnetzes in eine Gleichspannung, die vom stationärseitigen Unrecht der 25 eine geeignete Wechselspannung umgesetzt wird. Der Übertragers 21 sorgt für eine Weitergabe der Wechselspannung in dem fahrzeugseitigen Schaltkreis hierzu ist die Verbindung des um Richters 18 mit dem Übertragers 21 durch die zweite Schalteranordnung 16 hergestellt. Gleichzeitig ist die Verbindung zwischen den um Richter 18 und dem Elektromotor 13 mittels der ersten Schalteranordnung 15 unterbrochen.To charge the battery 14 of the vehicle, the rectifier 23 converts the three negligent voltage of the supply network into a DC voltage, which is converted by the stationary-side wrong of 25 a suitable AC voltage. The transformer 21 ensures a transfer of the AC voltage in the vehicle-side circuit for this purpose, the connection of the judge 18 to the transformer 21 by the second switch assembly 16 is made. At the same time, the connection between the order judge 18 and the electric motor 13 by means of the first switch assembly 15 is interrupted.
Im ersten Ausführungsbeispiel ist der DC-Zwischenkreis, also der Zwischenkreiskondensator 22 des Umrichters 18 während des Ladevorgangs im Wesentlichen direkt mit der Batterie 14 verbunden. Damit wird das Zwischenkreisspannungsniveau des Umrichters 18 durch den Ladezustand der Batterie 14 bestimmt. Das Fahrzeug überträgt per Funk oder ebenfalls durch induktive oder kapazitive Übertragung die gewünschte Lade-Leistung, die auch negativ sein kann, an den stationärseitigen Umrichter 25 bzw. dessen Steuerung. Dieser passt daraufhin durch Nachführung des Sollwertes für seine Zwischenkreisspannung den Leistungsfluss an den gewünschten Wert an.In the first exemplary embodiment, the DC intermediate circuit, that is to say the intermediate circuit capacitor 22 of the converter 18, is connected essentially directly to the battery 14 during the charging process. Thus, the DC link voltage level of the inverter 18 is determined by the state of charge of the battery 14. The vehicle transmits by radio or also by inductive or capacitive transmission the desired charging power, which may also be negative, to the stationary-side converter 25 and its controller. This then adapts the power flow to the desired value by tracking the setpoint value for its DC link voltage.
Im ersten Ausführungsbeispiel sind die Resonanzkondensatoren 19, 20 so mit dem Übertrager 21 abgestimmt, dass sich eine Schwingkreisfrequenz von 25 kHz ergibt. Die Schaltfrequenz des Umrichters 18 für den Motorbetrieb beträgt hingegen in diesem Beispiel 10 kHz.In the first exemplary embodiment, the resonance capacitors 19, 20 are matched to the transformer 21 in such a way that a resonant circuit frequency of 25 kHz results. The switching frequency of the inverter 18 for the motor operation, however, is 10 kHz in this example.
Figur 2 zeigt ein zweites Gesamtsystem 30 mit einem zweiten Ausführungsbeispiel für die Erfindung. Im Unterschied zum ersten Gesamtsystem 10 umfasst der fahrzeugseitige Umrichter 31 zwei statt drei Halbbrücken. Weiterhin sind parallel zu den Halbleiterschaltern des Umrichters 31 Schottky-Dioden 32 angeordnet. Schließlich wird im zweiten Ausführungsbeispiel auf der Fahrzeugsseite kein Resonanzkondensator 19 verwendet.FIG. 2 shows a second overall system 30 with a second exemplary embodiment of the invention. In contrast to the first overall system 10, the vehicle-side converter comprises 31 two instead of three half-bridges. Furthermore, 31 Schottky diodes 32 are arranged parallel to the semiconductor switches of the inverter. Finally, in the second embodiment, no resonance capacitor 19 is used on the vehicle side.
Im Fall der unidirektionalen Energieübertragung kann der Umrichter 31 passiv geschaltet und die parallelen Schottky- Dioden 32 als passiver Gleichrichter verwendet werden. Dadurch verringern sich die Durchlassverluste des Umrichters 31. Damit ist ein sicherer Ladebetrieb der Batterie 14 beiIn the case of unidirectional power transmission, the inverter 31 can be switched to passive and the parallel Schottky diodes 32 can be used as a passive rectifier. As a result, the forward losses of the converter 31 are reduced. This ensures reliable charging operation of the battery 14
Ausfall der Synchronisation der Umrichter 31, 25 gewährleistet. Diese Variante kann sowohl mit einem einphasigen als auch mit einem dreiphasigen Übertrager 21, 73 realisiert werden .Failure of the synchronization of the inverter 31, 25 guaranteed. This variant can be realized both with a single-phase and with a three-phase transformer 21, 73.
Um einen resonanten Betrieb derart sicherzustellen, dass die Leistungshalbleiter stets im Nulldurchgang des Laststromes schalten, schalten zweckmäßig beide Stromrichter vollkommen synchron. Dies kann beispielsweise mit einer zu- sätzlichen unbelasteten Wicklung bzw. einem Stromwandler realisiert werden. Eine PLL bzw. digitaleIn order to ensure a resonant operation such that the power semiconductors always switch at the zero crossing of the load current, both converters suitably switch completely synchronously. This can be realized, for example, with an additional unloaded winding or a current transformer. A PLL or digital
Implementierung stellt die Synchronisierung beider Umrichter 18, 31, 71, 25 sicher.Implementation ensures the synchronization of both inverters 18, 31, 71, 25.
Figur 3 zeigt ein drittes Gesamtsystem 50 mit einem dritten Ausführungsbeispiel für die Erfindung. Im dritten Ausführungsbeispiel weist der fahrzeugseitige Umrichter 18 drei Halbbrücken auf. Im Unterschied zu den ersten beiden Ausführungsbeispielen ist jedoch zwischen einem Anschluss der Bat- terie 14 und dem Umrichter 18 ein DC-DC-Wandler 51 vorgesehen. Im dritten Ausführungsbeispiel erfolgt die Regelung des Leistungsflusses durch Anpassung der Spannung der DC- Zwischenkreise der beiden Stromrichter folgendermaßen:Figure 3 shows a third overall system 50 with a third embodiment of the invention. In the third exemplary embodiment, the vehicle-side converter 18 has three half-bridges. In contrast to the first two exemplary embodiments, however, a DC-DC converter 51 is provided between a connection of the battery 14 and the converter 18. In the third embodiment, the regulation of the power flow takes place by adjusting the voltage of the DC intermediate circuits of the two power converters as follows:
Bei einem einphasigen Übertrager 21 werden fahrzeugseitig und stationär jeweils nur zwei Halbbrücken für die Ansteuerung benötigt. Die dritte Halbbrücke im Fahrzeug wird in diesem Fall genutzt, um die Batterie 14 mit dem Zwischenkreis über einen bidirektionalen Buck-Boost-Konverter, dem DC-DC-Wandler 51, anzuschließen, wobei noch eine zusätzliche Stellerdrossel notwendig ist. In diesem Fall wird die Zwischenkreisspannung des fahrzeugseitigen Umrichters 18 auf ein Niveau oberhalb der Ladeschlussspannung der Batterie 14 erhöht. Die Leistungsflussregelung erfolgt dann durch geringfügige Veränderung der Zwischenkreisspannung im fahrzeugseitigen Umrichter 18, indem der Leistungsabfluss aus dem Zwischenkreis an die Batterie 14 entsprechend geregelt wird. Wird an die Batterie weniger Leistung abgegeben, erhöht sich automatisch die Spannung im Zwischenkreis, wodurch sich das Spannungsverhältnis zwischen stationärer und Fahrzeugseite ändert, was wiederum die übertragene Leistung reduziert.In the case of a single-phase transformer 21, only two half-bridges are required for driving on the vehicle side and stationary. The third half bridge in the vehicle is used in this case to the battery 14 with the intermediate circuit on to connect a bidirectional buck-boost converter, the DC-DC converter 51, wherein an additional actuator throttle is necessary. In this case, the DC link voltage of the vehicle-side converter 18 is increased to a level above the end-of-charge voltage of the battery 14. The power flow control is then carried out by slightly changing the DC link voltage in the vehicle-side converter 18 by the power drain from the DC link to the battery 14 is controlled accordingly. If less power is supplied to the battery, the voltage in the DC link automatically increases, which alters the voltage ratio between the stationary side and the vehicle side, which in turn reduces the transmitted power.
Figur 4 zeigt ein viertes Gesamtsystem 70 mit einem vierten Ausführungsbeispiel für die Erfindung. Im Unterschied zu den ersten drei Ausführungsbeispielen wird im vierten Ausführungsbeispiel ein dreiphasiger Übertrager 73 verwendet. Die Resonanzabstimmung erfolgt in diesem Fall auch auf der Fahr- zeugseite mittels dreier fahrzeugseitiger Resonanzkondensatoren 74. Wird ein dreiphasiger Übertrager verwendet, sind sowohl stationär als auch fahrzeugseitig jeweils drei Halbrücken notwendig. In diesem Fall wird fahrzeugseitig eine vierte Halbbrücke vorgesehen, die die Funktionalität des DC-DC- Wandlers 76 übernimmt und die Batterie 14 mit dem Zwischenkreis des fahrzeugseitigen Umrichters 71 verbindet. Diese vierte Halbbrücke kann alternativ im normalen Fahrbetrieb, also wenn der Umrichter 71 eine permanentmagnet-erregte Synchronmaschine speist, als Schutzmodul genutzt werden. FIG. 4 shows a fourth overall system 70 with a fourth exemplary embodiment of the invention. In contrast to the first three embodiments, a three-phase transformer 73 is used in the fourth embodiment. In this case, the resonance tuning also takes place on the vehicle side by means of three resonance capacitors 74 on the vehicle. If a three-phase transformer is used, three half-bridges each are necessary both stationary and on the vehicle side. In this case, a fourth half-bridge is provided on the vehicle side, which takes over the functionality of the DC-DC converter 76 and connects the battery 14 to the intermediate circuit of the vehicle-side converter 71. This fourth half-bridge can alternatively be used as a protection module in normal driving mode, that is to say when the converter 71 feeds a permanent magnet-excited synchronous machine.

Claims

Patentansprüche claims
1. Betriebsanordnung zur Verwendung in einem elektrisch betriebenen Fahrzeug, das wenigstens einen Elektroantrieb (13) und wenigstens eine Energiespeichereinrichtung (14) zur Speisung des Elektroantriebs (13) mit elektrischer Energie aufweist, umfassend:An operating arrangement for use in an electrically powered vehicle, comprising at least one electric drive (13) and at least one energy storage device (14) for feeding the electric drive (13) with electrical energy, comprising:
- einen Umrichter (18, 31, 71), der eingangsseitig mit der Energiespeichereinrichtung (14) verbindbar ist, ausgestal- tet zur Wandlung einer eingangsseitigen Gleichspannung in eine ausgangsseitige ein- oder mehrphasige Wechselspannung und zur Wandlung einer ausgangsseitigen ein- oder mehrphasige Wechselspannung in eine eingangsseitige Gleichspannung, - einer Spulenanordnung (17) zur induktiven Übertragung elektrischer Energie,a converter (18, 31, 71), which can be connected on the input side to the energy storage device (14), is configured to convert an input-side DC voltage into an output-side single- or multi-phase AC voltage and to convert an output-side single-phase or polyphase AC voltage into one input-side DC voltage, - a coil arrangement (17) for inductive transmission of electrical energy,
- eine seriell zur Spulenanordnung (17) vorgesehene Kapazität- A serially to the coil assembly (17) provided capacity
(19, 20) zur Resonanzabstimmung.(19, 20) for resonance tuning.
2. Betriebsanordnung gemäß Anspruch 1, bei der die Kapazität (19, 20) und die Spulenanordnung (17, 75) so aufeinander abgestimmt sind, dass die sich ergebende Schwingkreisfrequenz im Bereich von 15 kHz bis 50 kHz liegt.2. Operating arrangement according to claim 1, wherein the capacitance (19, 20) and the coil arrangement (17, 75) are coordinated so that the resulting resonant circuit frequency is in the range of 15 kHz to 50 kHz.
3. Betriebsanordnung gemäß Anspruch 1 oder 2 mit3. Operating arrangement according to claim 1 or 2 with
- einer ausgangsseitig des Umrichters (18, 31, 71) vorgesehenen ersten Schalteinrichtung (15) zum Verbinden des Umrichters (18, 31, 71) mit dem Elektroantrieb (13),a first switching device (15) provided on the output side of the converter (18, 31, 71) for connecting the converter (18, 31, 71) to the electric drive (13),
- einer ausgangsseitig des Umrichters (18, 31, 71) vorgesehe- nen zweiten Schalteinrichtung (16) zum Verbinden des Umrichters (18, 31, 71) mit der Spulenanordnung (17, 75) .- A second switching device (16) provided on the output side of the converter (18, 31, 71) for connecting the converter (18, 31, 71) to the coil arrangement (17, 75).
4. Betriebsanordnung gemäß einem der vorangehenden Ansprüche, bei der der Umrichter (18, 31) drei Halbbrücken aufweist, von denen zwei ausgangsseitig mit der Spulenanordnung (17) verbunden sind. 4. Operating arrangement according to one of the preceding claims, wherein the inverter (18, 31) has three half-bridges, two of which are connected on the output side to the coil arrangement (17).
5. Betriebsanordnung gemäß einem der Ansprüche 1 bis 3, bei der der Umrichter (71) vier Halbbrücken aufweist, von denen drei ausgangsseitig mit der Spulenanordnung (75) verbunden sind.5. Operating arrangement according to one of claims 1 to 3, wherein the inverter (71) has four half-bridges, of which three are connected on the output side with the coil arrangement (75).
6. Betriebsanordnung gemäß einem der vorangehenden Ansprüche mit einem DC-DC-Wandler (51, 76) zwischen Energiespeichereinrichtung (14) und Umrichter (18, 31, 71), wobei der DC-DC- Wandler (51, 76) Teile des Umrichters (18, 31, 71) umfassen kann.6. Operating arrangement according to one of the preceding claims with a DC-DC converter (51, 76) between energy storage device (14) and inverter (18, 31, 71), wherein the DC-DC converter (51, 76) parts of the inverter (18, 31, 71).
7. Ladeverfahren zur Aufladung einer Energiespeichereinrichtung (14) eines elektrisch betriebenen Fahrzeugs, das wenigstens einen Elektroantrieb (13) aufweist und bei dem die Ener- giespeichereinrichtung (14) zur Speisung des Elektroantriebs (13) verwendet wird, und bei dem:7. A charging method for charging an energy storage device (14) of an electrically operated vehicle having at least one electric drive (13) and in which the energy storage device (14) is used to power the electric drive (13), and in which:
- elektrische Energie berührungslos mittels einer induktiven Übertragung an das elektrisch betriebenen Fahrzeug übertragen wird, - für die induktive Übertragung auf der Fahrzeugseite ein Umrichter (18, 31, 71) verwendet wird, der im Fahrbetrieb zur Speisung des Elektroantriebs (13) verwendet wird,- Electrical energy is transmitted contactlessly by means of an inductive transmission to the electrically powered vehicle, - For the inductive transmission on the vehicle side, a converter (18, 31, 71) is used, which is used in driving to power the electric drive (13),
- die Schaltung der Halbleiterschalter des Umrichters (18, 31, 71) im Stromnulldurchgang des Laststroms erfolgt, indem ein mittels einer Kapazität (19, 20) gebildeter Schwingkreis verwendet wird.- The circuit of the semiconductor switches of the inverter (18, 31, 71) in the current zero crossing of the load current takes place by means of a capacitance (19, 20) formed resonant circuit is used.
8. Ladeverfahren gemäß Anspruch 7, bei dem ein zwischen dem Umrichter (18, 31, 71) und der Energiespeichereinrichtung (14) vorgesehener DC-DC-Wandler (51, 76) verwendet wird, die Zwischenkreisspannung des Umrichters (18, 31, 71) auf einen Wert größer als die Ladeschlussspannung der Energiespeichereinrichtung (14) zu heben. 8. A charging method according to claim 7, wherein a between the inverter (18, 31, 71) and the energy storage device (14) provided for DC-DC converter (51, 76) is used, the intermediate circuit voltage of the inverter (18, 31, 71 ) to a value greater than the end-of-charge voltage of the energy storage device (14).
EP10717571A 2009-04-09 2010-04-06 Transmission of power bidirectionally and without contact to charge electric vehicles Withdrawn EP2416982A1 (en)

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