JP5545103B2 - Electric vehicle drive circuit - Google Patents

Electric vehicle drive circuit Download PDF

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JP5545103B2
JP5545103B2 JP2010173742A JP2010173742A JP5545103B2 JP 5545103 B2 JP5545103 B2 JP 5545103B2 JP 2010173742 A JP2010173742 A JP 2010173742A JP 2010173742 A JP2010173742 A JP 2010173742A JP 5545103 B2 JP5545103 B2 JP 5545103B2
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storage device
power storage
switch
circuit
chopper circuit
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JP2012034538A (en
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道雄 岩堀
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富士電機株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7241DC to AC or AC to DC power conversion

Description

  The present invention relates to a drive circuit for an electric vehicle that can receive power from both a DC power source and a power storage device, and drives an AC vehicle by driving an AC motor by a plurality of inverters that receive electric power supplied from them. .

As this type of conventional example, for example, there is one shown in Patent Document 1.
In the said patent document 1, the direct current power received from the overhead wire via the current collector (50: the code | symbol attached | subjected in FIG. 1 of patent document 1, and the following similarly) is converted into alternating current with an inverter (53), and a motor ( 54: M) is driven. Furthermore, the chopper circuit (106) is connected to the DC input side of the inverter (53), and the power storage device (65) is connected to the output. Then, electric power that cannot be regenerated to the overhead line during braking is stored in the power storage device (65) via the chopper circuit (106), and energy is saved by using the electric power during power running. Driving is possible.

Also, in another patent document 2, a plurality of inverters (4, 5 in this example: reference numerals in FIG. 1 of patent document 2, the same applies hereinafter) are provided in consideration of when an inverter fails in a similar circuit. ,
An example in which induction motors (7a, 7b, 8a, 8b) are driven by respective inverters is disclosed. In this example, a contactor (50, 51) for disconnecting the failed inverter is provided in the event of an inverter failure, etc. so that even if one inverter fails, it can be disconnected by the contactor to continue running. Yes.

  From these Patent Documents 1 and 2, for example, an electric vehicle driving circuit as shown in FIG. 6 can be considered. This circuit is an example in which power is supplied from the overhead wire 1 to the inverters 61 and 62 via the current collector 2, the filter reactor 3, and the filter capacitor 5 to drive the AC motor 7. A chopper circuit 8 is connected in parallel with the filter capacitor 5 and a power storage device 9 is connected thereto. The switch 4 is for disconnecting the failed inverter.

  FIG. 6 shows a configuration in which a plurality of inverters are provided with respect to Patent Document 1 in consideration of inverter failure. Further, with respect to Patent Document 2, the rated voltage of the overhead wire is fixed, so that a circuit that switches according to the voltage becomes unnecessary. Further, this corresponds to the case where the overhead wire is not pressurized by the power of the power storage device because the overhead wire voltage and the voltage of the power storage device are largely separated, for example, DC750V and DC300V.

JP 2006-340561 A JP 2008-253084 A

In FIG. 6, for example, even if the inverter 61 fails, it is possible to continue running using the inverter 62 that has not failed by disconnecting the inverter 61. However, since there is only one chopper circuit 8, if this breaks down in a section where there is no overhead wire, power cannot be supplied to the inverters 61 and 62, and traveling cannot be continued.
Accordingly, it is conceivable to provide a plurality of chopper circuits 8 and continue traveling by disconnecting the chopper circuit that has failed.

However, if there are a plurality of chopper circuits in this way, it is a matter of course that the corresponding number of circuits are added, resulting in a problem that the entire circuit becomes larger and costs increase.
Accordingly, an object of the present invention is to prevent a circuit from becoming large by using a single chopper circuit, and to enable self-running in a section where there is no overhead line even if this circuit breaks down.

In order to solve such a problem, in the invention of claim 1, an AC motor is driven by a plurality of inverters that can receive power from both a DC power source and a power storage device and receive power supplied from them. In the electric vehicle drive circuit for controlling the power supplied or absorbed by the power storage device, providing a chopper circuit between the output of the power storage device and the inverter DC input,
Connecting a switch between a neutral point of at least one of the AC motor windings and the power storage device, and disconnecting the chopper circuit when at least the chopper circuit and its control device fail, and turning on the switch; The inverter connected to the switch is operated as a chopper circuit.

  In the first aspect of the invention, a series circuit of a switch and a reactor can be used instead of the switch (invention of the second aspect). In the first or second aspect of the invention, the switch or the switch and the reactor are provided. Can be provided between the neutral point of the AC motor winding and one end of the reactor in the chopper circuit instead of being provided between the neutral point of the AC motor winding and the power storage device. (Invention of Claim 3). In the first to third aspects of the present invention, a charging device for charging the power storage device is provided instead of the DC power supply, and the power storage device is charged by the charging device while the electric vehicle is stopped or partially in a traveling section. As a result, the remaining section travels only with the electric power charged in the power storage device, and when the chopper circuit breaks down in the remaining section, the inverter can be operated by the chopper to enable self-running. (Invention of claim 4)

  According to this invention, not only when one inverter breaks down, but also when the chopper circuit breaks down, it can run on its own, so it does not get stuck and, as a result, avoids major disruptions and suspensions. It becomes possible to do.

The block diagram which shows embodiment of this invention. Explanatory drawing for demonstrating the operation | movement in this invention. The block diagram which shows other embodiment of this invention. The block diagram which shows other embodiment of this invention. The block diagram which shows another embodiment of this invention. The block diagram which shows the Example which combined two conventional examples.

FIG. 1 is a block diagram showing an embodiment according to the present invention.
As shown in the figure, this example is an example in which the input of the two inverters 61 and 62 is connected to the overhead line 1 via the current collector 2, the filter reactor 3 and the filter capacitor 5. The switch 4 is provided to disconnect the failed inverter when at least one of the inverters 61 and 62 fails.

  Further, a chopper circuit 8 is provided on the DC input side of the inverters 61 and 62, and switches 10a and 10b for disconnecting the chopper circuit 8 or its control device when the chopper circuit 8 or its control device breaks down are provided at the input and output thereof. The chopper circuit 8 and the power storage device 9 are connected via the switch 10b. As the power storage device 9, not only a battery but also a capacitor can be used. A switch 11 is provided between the neutral point of the winding of the AC motor 72 connected to the output of the inverter 62 and the power storage device 9.

  In the circuit as described above, the switches 4, 10a, 10b and 11 are operated as shown in FIG. Therefore, at normal times, the chopper circuit 8 supplies or absorbs the electric power of the power storage device 9 to the inverters 61 and 62 so that a desired operation can be performed. On the other hand, when the chopper circuit 8 fails, the switches 10a and 10b are turned off and the chopper circuit 8 is disconnected. When the switch 11 is turned on, a chopper circuit combining the inductances of the windings of the inverter 62 and the AC motor 72 is formed, and the three upper and lower arms of the inverter 62 are simultaneously turned on / off, It can be operated as a chopper.

Thereby, even when the chopper circuit 8 breaks down, the power of the power storage device 9 can be supplied to or absorbed by the capacitor 5 by the chopper circuit as described above. If the AC motor 71 is driven or braked by the electric power via the inverter 61, the traveling can be continued. In this example, the switch 11 is provided only at the neutral point of the winding of the AC motor 72. However, the switch 11 can be provided similarly.
FIG. 3 is a block diagram showing another embodiment of the present invention.
This is characterized in that a reactor 12 is connected in series with the switch 11 with respect to that shown in FIG.

FIG. 4 is a block diagram showing still another embodiment of the present invention.
Here, the connection point of the switch 11 to the power storage device 9 is connected to the reactor 8c in the chopper circuit 8, and the position of the switch 10b for disconnecting the chopper circuit 8 is changed accordingly. Is different. However, the operation is the same as in FIG. Here, the neutral point of the AC motor winding and the reactor 8c of the chopper circuit 8 are connected only by the switch 11 here, but a series circuit of the switch and the reactor may be connected.

FIG. 5 is a block diagram showing another embodiment of the present invention.
This is characterized in that a charging device 12 is provided instead of the overhead wire 1, the current collector 2 and the filter reactor 3 shown in FIG. The charging device 12 is installed outside the electric vehicle, and is connected only when the power storage device 9 is charged (for example, when the vehicle is stopped). In the normal state, the power storage device 9 is charged via the chopper circuit 8, and when the chopper circuit 8 fails, the switch 11 is turned on to charge the inverter 62 by performing a chopper operation. In addition, the operation | movement which supplies or absorbs the electric power of the electrical storage apparatus 9 to the filter capacitor 5 side during driving | running | working is the same as that of FIG.1 and FIG.3.

  DESCRIPTION OF SYMBOLS 1 ... Overhead wire, 2 ... Current collector, 3 ... Filter reactor, 4, 10a, 10b, 11 ... Switch, 5 ... Filter capacitor, 6 ... Inverter, 7 ... AC motor, 8 ... Chopper circuit, 9 ... Power storage device, 11 ... reactor, 12 ... charger.

Claims (4)

  1. The AC motor is driven by a plurality of inverters that can receive power from both the DC power supply and the power storage device and receive power supplied from them, and the output of the power storage device and the inverter DC input In the electric vehicle drive circuit for controlling the power supplied or absorbed by the power storage device, with a chopper circuit in between,
    Connecting a switch between a neutral point of at least one of the AC motor windings and the power storage device, and disconnecting the chopper circuit when at least the chopper circuit and its control device fail, and turning on the switch; An electric vehicle driving circuit, wherein an inverter connected to the switch is operated as a chopper circuit.
  2.   2. The electric vehicle drive circuit according to claim 1, wherein a series circuit of a switch and a reactor is used instead of the switch.
  3.   Instead of providing the switch or a series circuit of the switch and the reactor between the neutral point of the AC motor winding and the power storage device, the neutral point of the AC motor winding and one end of the reactor in the chopper circuit The drive circuit for an electric vehicle according to claim 1, wherein the drive circuit is provided in between.
  4.   A charging device for charging the power storage device is provided instead of the DC power supply, and the power storage device is charged by the charging device while the electric vehicle is stopped or partially traveling, whereby the remaining section is charged to the power storage device. 4. The vehicle according to claim 1, wherein, when the chopper circuit fails in the remaining section, the inverter can be operated by a chopper to enable self-running. The drive circuit for electric vehicles as described in one.
JP2010173742A 2010-08-02 2010-08-02 Electric vehicle drive circuit Active JP5545103B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010173742A JP5545103B2 (en) 2010-08-02 2010-08-02 Electric vehicle drive circuit

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Application Number Priority Date Filing Date Title
JP2010173742A JP5545103B2 (en) 2010-08-02 2010-08-02 Electric vehicle drive circuit

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JP2012034538A JP2012034538A (en) 2012-02-16
JP5545103B2 true JP5545103B2 (en) 2014-07-09

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Publication number Priority date Publication date Assignee Title
JP2014054102A (en) * 2012-09-07 2014-03-20 Toyota Motor Corp Electric vehicle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2713565B1 (en) * 1993-12-13 1996-01-19 Gec Alsthom Transport Sa High availability multicurrent power system for railway locomotive.
JP2000004505A (en) * 1998-06-11 2000-01-07 Aisin Aw Co Ltd Battery charging device
JP2002064901A (en) * 2000-08-21 2002-02-28 Toshiba Corp Electric car controller
JP4023171B2 (en) * 2002-02-05 2007-12-19 トヨタ自動車株式会社 Load drive device, charge control method for power storage device in load drive device, and computer-readable recording medium containing program for causing computer to execute charge control
JP4211806B2 (en) * 2006-06-07 2009-01-21 トヨタ自動車株式会社 Vehicle drive system and vehicle equipped with the same
JP4814825B2 (en) * 2007-03-30 2011-11-16 公益財団法人鉄道総合技術研究所 Hybrid power system
JP5527497B2 (en) * 2008-01-11 2014-06-18 富士電機株式会社 AC motor drive circuit and electric vehicle drive circuit

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