WO2008122295A1 - Fuel cell system for a vehicle - Google Patents

Fuel cell system for a vehicle Download PDF

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Publication number
WO2008122295A1
WO2008122295A1 PCT/EP2007/003047 EP2007003047W WO2008122295A1 WO 2008122295 A1 WO2008122295 A1 WO 2008122295A1 EP 2007003047 W EP2007003047 W EP 2007003047W WO 2008122295 A1 WO2008122295 A1 WO 2008122295A1
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WO
WIPO (PCT)
Prior art keywords
fuel cell
voltage
converter
cell system
symmetrical
Prior art date
Application number
PCT/EP2007/003047
Other languages
German (de)
French (fr)
Inventor
Werner Bleschner
Jürgen HÖRMANN
Jürgen LEITZ
Ralf MÜLLER
Original Assignee
Daimler Ag
Ford Global Technologies, Llc
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 Daimler Ag, Ford Global Technologies, Llc filed Critical Daimler Ag
Priority to DE112007003334T priority Critical patent/DE112007003334A5/en
Priority to PCT/EP2007/003047 priority patent/WO2008122295A1/en
Publication of WO2008122295A1 publication Critical patent/WO2008122295A1/en

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Classifications

    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • 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
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Definitions

  • the invention relates to a fuel cell system for a vehicle, comprising a first fuel cell stack and a second fuel cell stack for generating electrical energy.
  • Such a fuel cell system is known from JP 2003-243008 Al.
  • the fuel cell system comprises a plurality of fuel cell stacks which are operated with a hydrogen-containing fuel gas and with an oxygen-containing oxidant in the form of air.
  • Each of the fuel cell stack is the output side associated with its own DC-DC converter, the DC-DC converter are connected in parallel to supply an in-vehicle electromotive drive with electrical energy.
  • the disadvantage is that the known arrangement is configured exclusively for generating a DC voltage.
  • the operation of an AC motor, as it is commonly used in electric motor vehicle drives, is therefore not possible.
  • the object of the present invention is therefore to provide a fuel cell system with a plurality of fuel cell stacks, which are configured in such a way that an efficient fuel cell system can be provided AC voltage generation is guaranteed to operate an electromotive vehicle drive.
  • the fuel cell system for a vehicle comprises a first fuel cell stack and a second fuel cell stack, wherein the fuel cell stack is in each case supplied with a hydrogen-containing fuel gas and an oxygen-containing oxidizing agent for generating electrical energy.
  • the fuel cell stacks are connected to provide a quasi-symmetrical DC voltage, the quasi-symmetrical DC voltage being supplied to a subsequent AC voltage converter in order to generate an AC voltage for operating an electromotive vehicle drive.
  • a quasi-symmetrical DC voltage is to be understood as meaning a voltage which consists of a positive voltage component and a negative voltage component, the two voltage components having the same or different amounts.
  • Such a quasi-symmetrical DC voltage has the advantage that it can be converted into an AC voltage suitable for operating the electromagnetic vehicle drive without additional inverter and the associated efficiency losses.
  • the DC-DC converter is also designed as a voltage regulator for keeping constant the symmetrical DC voltage. This makes it possible to avoid that voltage fluctuations that occur during operation of the fuel cell stack, undesirably affect the stability of the AC voltage to be generated.
  • the DC-DC converter as a voltage booster (“Boost Converter” or “Step Up Converter”) works to provide an AC voltage of sufficient height to operate the electric motor vehicle drive.
  • Boost Converter or “Step Up Converter”
  • the vehicle drive is preferably a powerful three-phase motor. Accordingly, there is a possibility that the AC-DC converter is configured to generate a three-phase AC current.
  • an electrical energy store for buffering the provided symmetrical DC voltage for the case of short-term load peaks between the DC-DC converter and the AC voltage converter.
  • the electrical energy store can be, for example, an arrangement of structurally compact, high-capacitance double-layer capacitors or so-called supercapacitors.
  • the fuel cell system 10 has a first fuel cell stack IIa and a second fuel cell stack IIb, wherein the fuel cell stacks IIa and IIb respectively a hydrogen-containing fuel gas and an oxygen-containing oxidizing agent for generating electrical energy is supplied.
  • the individual constituents of the fuel cell system 10 can in this case be combined in a common housing assembly.
  • the fuel cell stacks IIa and IIb are connected such that a quasi-symmetrical DC voltage 13 is provided with respect to a common ground line 12, which consists of a positive voltage component + V a and a negative voltage component -V b , the two voltage components + V a and -V b in the present case have different amounts ranging between 25 and 250 volts.
  • a DC voltage converter 14 designed as a voltage regulator compensates for the deviation between the magnitudes of the two voltage components + V a and -V b in such a way that on the output side a stabilized symmetrical DC voltage 15 with equal voltage components + V ' a and -V' b is available ,
  • the DC-DC converter 14 is a symmetrically constructed voltage booster ("Boost Converter” or “Step Up Converter”), which consists of six individual transducers conventional design, each individual converter in addition to an input-side storage inductance a MOSFET switch and a output side diode comprises.
  • Boost Converter or “Step Up Converter”
  • Step Up Converter The coordination of the MOSFET switches takes place here by means of a central control device, not shown, of the fuel cell system 10.
  • a downstream electrical energy store 20 serves to buffer the symmetrical DC voltage provided. 15 in the event of short-term load peaks.
  • the electrical energy store 20 is an arrangement of highly capacitive double-layer capacitors or so-called supercapacitors.
  • the symmetrical DC voltage 15 generated by the DC voltage converter 14 is then converted by means of an AC voltage converter 21 into an AC voltage 22 for operating an electromotive vehicle drive 23.
  • the vehicle drive 23 is, for example, a three-phase motor.
  • the AC voltage converter 21 is configured to generate a three-phase alternating current, wherein a controllable voltage divider formed from a transistor pair is provided for each of the three phases, which is controlled by the central control device of the fuel cell system 10 for generating the respective sinusoidal AC voltage component.

Abstract

The invention relates to a fuel cell system for a vehicle, comprising a first fuel cell stack (11a) and a second fuel cell stack (11b) for generating electric power. According to the invention, the fuel cell stacks (11a, 11b) are interconnected to supply a quasi-symmetric direct voltage (13) that is fed to an AC voltage converter (21) in order to generate an alternating voltage for operating an electromotive vehicle drive (23).

Description

Brennstoffzellensystem für ein Fahrzeug Fuel cell system for a vehicle
Die Erfindung bezieht sich auf ein Brennstoffzellensystem für ein Fahrzeug, mit einem ersten Brennstoffzellenstapel und einem zweiten Brennstoffzellenstapel zur Erzeugung elektrischer Energie .The invention relates to a fuel cell system for a vehicle, comprising a first fuel cell stack and a second fuel cell stack for generating electrical energy.
Ein derartiges Brennstoffzellensystem ist aus der JP 2003- 243008 Al bekannt. Das Brennstoffzellensystem umfasst mehrere Brennstoffzellenstapel , die mit einem Wasserstoffhaltigen Brenngas sowie mit einem sauerstoffhaltigen Oxidationsmittel in Form von Luft betrieben werden. Jeder der Brennstoffzellenstapel ist ausgangsseitig ein eigener Gleichspannungswandler zugeordnet, wobei die Gleichspannungswandler parallel geschaltet sind, um einen im Fahrzeug befindlichen elektromotorischen Antrieb mit elektrischer Energie zu versorgen.Such a fuel cell system is known from JP 2003-243008 Al. The fuel cell system comprises a plurality of fuel cell stacks which are operated with a hydrogen-containing fuel gas and with an oxygen-containing oxidant in the form of air. Each of the fuel cell stack is the output side associated with its own DC-DC converter, the DC-DC converter are connected in parallel to supply an in-vehicle electromotive drive with electrical energy.
Nachteilig ist, dass die bekannte Anordnung ausschließlich zur Erzeugung einer Gleichspannung konfiguriert ist. Der Betrieb eines Wechselstrommotors, wie er in elektromotorischen Fahrzeugantrieben üblicherweise Verwendung findet, ist folglich nicht möglich.The disadvantage is that the known arrangement is configured exclusively for generating a DC voltage. The operation of an AC motor, as it is commonly used in electric motor vehicle drives, is therefore not possible.
Aufgabe der vorliegenden Erfindung ist es daher, ein Brennstoffzellensystem mit mehreren Brennstoffzellenstapeln anzugeben, die derart konfiguriert sind, dass eine effiziente Wechselspannungserzeugung zum Betreiben eines elektromotorischen Fahrzeugantriebs gewährleistet ist.The object of the present invention is therefore to provide a fuel cell system with a plurality of fuel cell stacks, which are configured in such a way that an efficient fuel cell system can be provided AC voltage generation is guaranteed to operate an electromotive vehicle drive.
Das Brennstoffzellensystem für ein Fahrzeug umfasst einen ersten Brennstoffzellenstapel und einen zweiten Brennstoffzellenstapel, wobei den Brennstoffzellenstapel jeweils ein wasserstoffhaltiges Brenngas sowie ein sauerstoffhaltiges O- xidationsmittel zur Erzeugung elektrischer Energie zugeführt wird. Erfindungsgemäß sind die Brennstoffzellenstapel zur Bereitstellung einer quasisymmetrischen Gleichspannung verschaltet, wobei die quasisymmetrische Gleichspannung einem nachfolgenden Wechselspannungswandler zugeführt wird, um eine Wechselspannung zum Betreiben eines elektromotorischen Fahrzeugantriebs zu erzeugen.The fuel cell system for a vehicle comprises a first fuel cell stack and a second fuel cell stack, wherein the fuel cell stack is in each case supplied with a hydrogen-containing fuel gas and an oxygen-containing oxidizing agent for generating electrical energy. According to the invention, the fuel cell stacks are connected to provide a quasi-symmetrical DC voltage, the quasi-symmetrical DC voltage being supplied to a subsequent AC voltage converter in order to generate an AC voltage for operating an electromotive vehicle drive.
Unter einer quasisymmetrischen Gleichspannung ist im vorliegenden Fall eine Spannung zu verstehen, die aus einem positiven Spannungsanteil sowie einem negativen Spannungsanteil besteht, wobei die beiden Spannungsanteile gleiche oder unterschiedliche Beträge aufweisen.In the present case, a quasi-symmetrical DC voltage is to be understood as meaning a voltage which consists of a positive voltage component and a negative voltage component, the two voltage components having the same or different amounts.
Eine derartige quasisymmetrische Gleichspannung weist den Vorteil auf, dass sich diese ohne zusätzlichen Inverter und die damit einhergehenden Wirkungsgradverluste in eine zum Betreiben des elektromagnetischen Fahrzeugantriebs geeignete Wechselspannung umwandeln lässt.Such a quasi-symmetrical DC voltage has the advantage that it can be converted into an AC voltage suitable for operating the electromagnetic vehicle drive without additional inverter and the associated efficiency losses.
Vorteilhafte Ausführungen des erfindungsgemäßen Verfahrens gehen aus den Unteransprüchen hervor.Advantageous embodiments of the method according to the invention will become apparent from the dependent claims.
Zur Erzeugung einer sinusförmigen Wechselspannung, wie sie zum Betreiben von Wechselstrommotoren im allgemeinen benötigt wird, ist es von Vorteil, wenn eine betragsmäßige Abweichung zwischen den beiden Spannungsanteilen der quasisymmetrischen Gleichspannung mittels eines dem Wechselspannungswandler vorgeschalteten Gleichspannungswandlers beseitigt oder zumindest weitgehend vermindert wird. D.h. am Ausgang des Gleichspannungswandlers liegt eine symmetrische Gleichspannung an.In order to generate a sinusoidal alternating voltage, as required for operating AC motors in general, it is advantageous if a magnitude deviation between the two voltage components of the quasi-symmetrical DC voltage by means of a DC voltage converter upstream DC-DC converter eliminated or at least is largely reduced. That is, at the output of the DC-DC converter is a balanced DC voltage.
Dabei besteht die Möglichkeit, dass der Gleichspannungswandler zugleich als Spannungsregler zum Konstanthalten der symmetrischen Gleichspannung ausgebildet ist. Hierdurch lässt sich vermeiden, dass sich Spannungsschwankungen, die beim Betrieb der Brennstoffzellenstapel auftreten, in unerwünschter Weise auf die Stabilität der zu erzeugenden Wechselspannung auswirken .There is the possibility that the DC-DC converter is also designed as a voltage regulator for keeping constant the symmetrical DC voltage. This makes it possible to avoid that voltage fluctuations that occur during operation of the fuel cell stack, undesirably affect the stability of the AC voltage to be generated.
Zusätzlich oder alternativ ist es denkbar, dass der Gleichspannungswandler als Spannungshochsetzer („Boost Converter" oder „Step Up Converter") arbeitet, um eine Wechselspannung ausreichender Höhe zum Betreiben des elektromotorischen Fahrzeugantriebs bereitzustellen.Additionally or alternatively, it is conceivable that the DC-DC converter as a voltage booster ("Boost Converter" or "Step Up Converter") works to provide an AC voltage of sufficient height to operate the electric motor vehicle drive.
Im Sinne hoher Antriebsmomente handelt es sich bei dem Fahrzeugantrieb vorzugsweise um einen leistungsstarken Drehstrommotor. Dementsprechend besteht die Möglichkeit, dass der Wechselspannungswandler zur Erzeugung eines Dreiphasenwechselstroms konfiguriert ist.In the sense of high drive torques, the vehicle drive is preferably a powerful three-phase motor. Accordingly, there is a possibility that the AC-DC converter is configured to generate a three-phase AC current.
Vorteilhafterweise ist zwischen dem Gleichspannungswandler und dem Wechselspannungswandler ein elektrischer Energiespeicher zur Pufferung der bereitgestellten symmetrischen Gleichspannung für den Fall kurzzeitiger Lastspitzen vorgesehen. Bei dem elektrischen Energiespeicher kann es sich beispielsweise um eine Anordnung baulich kompakter hochkapazitiver Doppelschichtkondensatoren bzw. sogenannter Superkondensato- ren handeln.Advantageously, an electrical energy store is provided for buffering the provided symmetrical DC voltage for the case of short-term load peaks between the DC-DC converter and the AC voltage converter. The electrical energy store can be, for example, an arrangement of structurally compact, high-capacitance double-layer capacitors or so-called supercapacitors.
Das erfindungsgemäße Brennstoffzellensystem wird im folgenden anhand der beigefügten Zeichnung näher erläutert. Die einzige Figur zeigt ein Ausführungsbeispiel des erfindungsgemäßen Brennstoffzellensystems zum Betreiben eines elektromotorischen Fahrzeugantriebs. Das Brennstoffzellensystem 10 weist einen ersten Brennstoffzellenstapel IIa sowie einen zweiten Brennstoffzellenstapel IIb auf, wobei den Brennstoffzellenstapeln IIa und IIb jeweils ein Wasserstoffhaltiges Brenngas sowie ein sauerstoffhaltiges Oxidationsmittel zur Erzeugung elektrischer Energie zugeführt wird. Die einzelnen Bestandteile des Brennstoffzel- lensystems 10 können hierbei in einer gemeinsamen Gehäusebaugruppe zusammengefasst sein.The fuel cell system according to the invention is explained below with reference to the accompanying drawings. The single FIGURE shows an embodiment of the fuel cell system according to the invention for operating an electromotive vehicle drive. The fuel cell system 10 has a first fuel cell stack IIa and a second fuel cell stack IIb, wherein the fuel cell stacks IIa and IIb respectively a hydrogen-containing fuel gas and an oxygen-containing oxidizing agent for generating electrical energy is supplied. The individual constituents of the fuel cell system 10 can in this case be combined in a common housing assembly.
Die Brennstoffzellenstapel IIa und IIb sind derart verschaltet, dass eine bezüglich einer gemeinsamen Erdleitung 12 quasisymmetrische Gleichspannung 13 bereitgestellt wird, die aus einem positiven Spannungsanteil + Va sowie einem negativen Spannungsanteil -Vb besteht, wobei die beiden Spannungsanteile +Va und -Vb im vorliegenden Fall unterschiedliche Beträge im Bereich zwischen 25 und 250 Volt aufweisen.The fuel cell stacks IIa and IIb are connected such that a quasi-symmetrical DC voltage 13 is provided with respect to a common ground line 12, which consists of a positive voltage component + V a and a negative voltage component -V b , the two voltage components + V a and -V b in the present case have different amounts ranging between 25 and 250 volts.
Ein als Spannungsregler ausgebildeter Gleichspannungswandler 14 gleicht die Abweichung zwischen den Beträgen der beiden Spannungsanteile + Va und -Vb derart aus, dass ausgangssei - tig eine stabilisierte symmetrische Gleichspannung 15 mit betraglich gleichen Spannungsanteilen + V'a und -V'b zur Verfügung steht .A DC voltage converter 14 designed as a voltage regulator compensates for the deviation between the magnitudes of the two voltage components + V a and -V b in such a way that on the output side a stabilized symmetrical DC voltage 15 with equal voltage components + V ' a and -V' b is available ,
Beispielsgemäß handelt es sich bei dem Gleichspannungswandler 14 um einen symmetrisch aufgebauten Spannungshochsetzer („Bo- ost Converter" oder „Step Up Converter"), der aus insgesamt sechs Einzelwandlern konventioneller Bauart besteht, wobei jeder Einzelwandler neben einer eingangsseitigen Speicherinduktivität einen MOSFET-Schalter sowie eine ausgangsseitige Diode umfasst. Die Koordination der MOSFET-Schalter erfolgt hierbei mittels einer nicht dargestellten zentralen Steuereinrichtung des BrennstoffZeilensystems 10.By way of example, the DC-DC converter 14 is a symmetrically constructed voltage booster ("Boost Converter" or "Step Up Converter"), which consists of six individual transducers conventional design, each individual converter in addition to an input-side storage inductance a MOSFET switch and a output side diode comprises. The coordination of the MOSFET switches takes place here by means of a central control device, not shown, of the fuel cell system 10.
Ein nachgeschalteter elektrischer Energiespeicher 20 dient der Pufferung der bereitgestellten symmetrischen Gleichspan- nung 15 für den Fall kurzzeitiger Lastspitzen. Bei dem elektrischen Energiespeicher 20 handelt es sich beispielsgemäß um eine Anordnung hochkapazitiver Doppelschichtkondensatoren bzw. so genannter Superkondensatoren .A downstream electrical energy store 20 serves to buffer the symmetrical DC voltage provided. 15 in the event of short-term load peaks. By way of example, the electrical energy store 20 is an arrangement of highly capacitive double-layer capacitors or so-called supercapacitors.
Die von Seiten des Gleichspannungswandlers 14 erzeugte symmetrische Gleichspannung 15 wird anschließend mittels eines Wechselspannungswandlers 21 in eine Wechselspannung 22 zum Betreiben eines elektromotorischen Fahrzeugantriebs 23 umgewandelt. Bei dem Fahrzeugantrieb 23 handelt es sich beispielsgemäß um einen Drehstrommotor. Dementsprechend ist der Wechselspannungswandler 21 zur Erzeugung eines Dreiphasenwechselstroms konfiguriert, wobei für jede der drei Phasen ein aus einem Transistorpaar gebildeter steuerbarer Spannungsteiler vorgesehen ist, der von Seiten der zentralen Steuereinrichtung des Brennstoffzellensystems 10 zur Erzeugung des jeweiligen sinusförmigen Wechselspannungsanteils angesteuert wird. The symmetrical DC voltage 15 generated by the DC voltage converter 14 is then converted by means of an AC voltage converter 21 into an AC voltage 22 for operating an electromotive vehicle drive 23. The vehicle drive 23 is, for example, a three-phase motor. Accordingly, the AC voltage converter 21 is configured to generate a three-phase alternating current, wherein a controllable voltage divider formed from a transistor pair is provided for each of the three phases, which is controlled by the central control device of the fuel cell system 10 for generating the respective sinusoidal AC voltage component.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
Figure imgf000008_0001
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Claims

Patentansprüche claims
1. Brennstoffzellensystem für ein Fahrzeug, mit einem ersten Brennstoffzellenstapel (IIa) und einem zweiten Brennstoffzellenstapel (IIb) zur Erzeugung elektrischer Energie, dadurch gekennzeichnet, dass die Brennstoffzellenstapel (IIa, IIb) zur Bereitstellung einer quasisymmetrischen Gleichspannung (13) verschaltet sind, wobei die quasisymmetrische Gleichspannung (13) einem Wechselspannungswandler (21) zugeführt wird, um eine WechselSpannung zum Betreiben eines elektromotorischen Fahrzeugantriebs (23) zu erzeugen.A fuel cell system for a vehicle, comprising a first fuel cell stack (IIa) and a second fuel cell stack (IIb) for generating electrical energy, characterized in that the fuel cell stacks (IIa, IIb) are interconnected to provide a quasi-symmetrical DC voltage (13) quasi-symmetrical DC voltage (13) is supplied to an AC voltage converter (21) to generate an AC voltage for operating an electromotive vehicle drive (23).
2. Brennstoffzellensystem nach Anspruch 1, dadurch gekennzeichnet, dass ein dem Wechselspannungswandler (21) vorgeschalteter Gleichspannungswandler (14) die quasisymmetrische Gleichspannung (13) in eine symmetrische Gleichspannung (15) konvertiert .2. Fuel cell system according to claim 1, characterized in that the AC converter (21) upstream DC-DC converter (14) converts the quasi-symmetrical DC voltage (13) into a symmetrical DC voltage (15).
3. Brennstoffzellensystem nach Anspruch 2, dadurch gekennzeichnet, dass der Gleichspannungswandler (14) als Spannungsregler ausgebildet ist.3. Fuel cell system according to claim 2, characterized in that the DC-DC converter (14) is designed as a voltage regulator.
4. Brennstoffzellensystem nach Anspruch 2, dadurch gekennzeichnet, dass der Gleichspannungswandler (14) als Spannungshochsetzer ausgebildet ist.4. Fuel cell system according to claim 2, characterized in that the DC-DC converter (14) is designed as a voltage step-up converter.
5. Brennstoffzellensystem nach Anspruch 1, dadurch gekennzeichnet, dass der Wechselspannungswandler (21) zum Betreiben des elektromotorischen Fahrzeugantriebs (23) einen Dreiphasenwechselstrom (22) erzeugt.5. Fuel cell system according to claim 1, characterized in that the AC voltage converter (21) for operating the electromotive vehicle drive (23) generates a three-phase alternating current (22).
6. Brennstoffzellensystem nach Anspruch 2, dadurch gekennzeichnet, dass zwischen dem Gleichspannungswandler (14) und dem Wechselspannungswandler (21) ein elektrischer Energiespeicher (20) angeordnet ist.6. Fuel cell system according to claim 2, characterized in that between the DC-DC converter (14) and the AC voltage converter (21), an electrical energy store (20) is arranged.
7. Brennstoffzellensystem nach Anspruch 6, dadurch gekennzeichnet, dass es sich bei dem elektrischen Energiespeicher (20) um eine Anordnung hochkapazitiver Doppelschichtkondensatoren handelt . 7. Fuel cell system according to claim 6, characterized in that the electrical energy store (20) is an arrangement of high-capacity double-layer capacitors.
PCT/EP2007/003047 2007-04-04 2007-04-04 Fuel cell system for a vehicle WO2008122295A1 (en)

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DE112007003334T DE112007003334A5 (en) 2007-04-04 2007-04-04 Fuel cell system for a vehicle
PCT/EP2007/003047 WO2008122295A1 (en) 2007-04-04 2007-04-04 Fuel cell system for a vehicle

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Application Number Title Priority Date Filing Date
PCT/EP2007/003047 WO2008122295A1 (en) 2007-04-04 2007-04-04 Fuel cell system for a vehicle

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DE (1) DE112007003334A5 (en)
WO (1) WO2008122295A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020105216A1 (en) 2020-02-27 2021-09-02 Sunfire Gmbh Transformerless cell stack power electronics switching arrangement

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US4491779A (en) * 1983-10-12 1985-01-01 General Motors Corporation Motor vehicle electrical system
DE4305768A1 (en) * 1993-02-25 1994-09-01 Licentia Gmbh Power supply unit
US20030026118A1 (en) * 2001-08-03 2003-02-06 Takashi Ikimi 3-Level inverter apparatus
DE10127892A1 (en) * 2000-06-12 2003-10-30 Honda Motor Co Ltd Starting control device for a vehicle with a fuel cell
US20040100149A1 (en) * 2002-11-22 2004-05-27 Jih-Sheng Lai Topologies for multiple energy sources

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US4491779A (en) * 1983-10-12 1985-01-01 General Motors Corporation Motor vehicle electrical system
DE4305768A1 (en) * 1993-02-25 1994-09-01 Licentia Gmbh Power supply unit
DE10127892A1 (en) * 2000-06-12 2003-10-30 Honda Motor Co Ltd Starting control device for a vehicle with a fuel cell
US20030026118A1 (en) * 2001-08-03 2003-02-06 Takashi Ikimi 3-Level inverter apparatus
US20040100149A1 (en) * 2002-11-22 2004-05-27 Jih-Sheng Lai Topologies for multiple energy sources

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020105216A1 (en) 2020-02-27 2021-09-02 Sunfire Gmbh Transformerless cell stack power electronics switching arrangement

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