JP2006060912A - Power conversion device and vehicle provided with it - Google Patents

Power conversion device and vehicle provided with it Download PDF

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JP2006060912A
JP2006060912A JP2004239674A JP2004239674A JP2006060912A JP 2006060912 A JP2006060912 A JP 2006060912A JP 2004239674 A JP2004239674 A JP 2004239674A JP 2004239674 A JP2004239674 A JP 2004239674A JP 2006060912 A JP2006060912 A JP 2006060912A
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power
power supply
switch
matrix converter
connected
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JP4589056B2 (en
Inventor
Majumdar Gourab
Tetsuhiro Ishikawa
Masahiro Kimata
Hichirosai Oyobe
Yoshitaka Yuu
ゴーラブ・マジュムダール
七郎斎 及部
政弘 木全
義珍 由宇
哲浩 石川
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Mitsubishi Electric Corp
Toyota Motor Corp
トヨタ自動車株式会社
三菱電機株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device in which power is mutually converted between a plurality of DC power sources and electric loads using a matrix converter and the number of switches of the matrix converter is reduced.
A fuel cell FC and a battery BAT are connected in parallel to a matrix converter MC. The negative terminal of the fuel cell FC and the positive terminal of the battery BAT are connected to the matrix converter MC via a common power supply line LB. The first switch group 54 connected to the power supply line LA to which the positive electrode terminal of the fuel cell FC is connected is composed of unidirectional switches SAa to SAc.
[Selection] Figure 1

Description

  The present invention relates to a power conversion device and a vehicle including the same, and more particularly to a power conversion device using a matrix converter and a vehicle including the same.

  2. Description of the Related Art Conventionally, a fuel cell vehicle using a fuel cell as a direct current power source is known as an embodiment of an electric vehicle. 2. Description of the Related Art A fuel cell vehicle is generally equipped with a secondary battery for recovering regenerative energy generated during regeneration of an AC motor as a power source. In such a fuel cell vehicle, the DC power output from the fuel cell and / or the secondary battery is converted into AC power and supplied to the AC motor, or AC power generated during the regeneration operation of the AC motor is used. Converting to DC power to charge the secondary battery, or further converting DC power from the fuel cell to a predetermined DC voltage to charge the secondary battery, etc. Various power conversions are performed between AC motors.

  Conventionally, as such a power conversion device that converts power between a plurality of DC power supplies and AC motors, a power conversion in which an inverter that performs DC-AC conversion and a converter that performs voltage conversion between DCs is combined. Devices are commonly used.

  On the other hand, in recent years, matrix converters have attracted attention as power converters. The matrix converter can directly generate power of an arbitrary frequency by performing PWM (Pulse Width Modulation) control using a plurality of bidirectional switches capable of flowing current bidirectionally. Since the matrix converter does not include the direct current link unit provided in the above-described conventional power conversion device, the device can be downsized, and a large-capacity and high-efficiency power can be obtained using a small-capacity switch. Since it has characteristics such as the ability to realize conversion, there is high expectation for a matrix converter particularly in electric vehicles and hybrid vehicles that have high required characteristics for downsizing and high efficiency.

As an example of the configuration of such a matrix converter, JP 2002-534050 A (Patent Document 1) discloses a configuration of a matrix converter including nine bidirectional switches arranged in three rows and three columns. To do.
JP 2002-534050 A

  However, when applying a power converter using a matrix converter to a vehicle such as a fuel cell vehicle, it is desired to solve the following problems.

  The first is to reduce the number of switches constituting the matrix converter. Matrix converters generally require a large number of switching elements. As described above, since the matrix converter does not include a DC link part, it is smaller than a conventional power conversion device, but from a cost aspect, a mounting surface on a vehicle in which miniaturization is strongly demanded, etc. Reduction of switches is desired.

  Secondly, the regenerative operation of the motor is realized at an arbitrary voltage level. In the conventional power conversion device, in order for the regenerative operation to be performed normally, the electromotive voltage of the motor during the regenerative operation needs to be lower than the voltage level of the secondary battery. Therefore, in order to increase the recovery efficiency of regenerative power, a power converter that can perform regenerative commutation to the secondary battery even when the electromotive voltage of the motor is higher than the voltage level of the secondary battery is desired.

  The conventional matrix converter including the matrix converter disclosed in Patent Document 1 cannot solve such a problem.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to perform power conversion between a plurality of DC power supplies and electric loads using a matrix converter, and the matrix converter. It is providing the power converter device which reduced the number of switches.

  Another object of the present invention is to convert power between a plurality of DC power supplies and an electrical load using a matrix converter, and to realize a regenerative operation of the electrical load at an arbitrary voltage level. Is to provide a device.

  Another object of the present invention is to provide a power conversion device that converts power between a plurality of DC power supplies and electric loads using a matrix converter and reduces the number of switches of the matrix converter. Is to provide a vehicle.

  Another object of the present invention is to mutually convert power between a plurality of DC power supplies and electric loads using a matrix converter, and realize a regenerative operation of a polyphase AC rotating machine at an arbitrary voltage level. It is providing the vehicle provided with the power converter device which performs.

  According to the present invention, the power conversion device is connected to the first and second DC power supplies and the electric load, and converts power between the first DC power supply, the second DC power supply, and the electric load. And a controller for controlling the operation of the matrix converter, wherein the first and second DC power supplies are connected in parallel to the matrix converter, and the negative terminal of the first DC power supply and the second DC power supply The positive terminal of the power supply is connected to the matrix converter via a common first power supply line.

  Preferably, the first DC power source is a fuel cell, the second DC power source is a secondary battery, and the matrix converter is connected to a second power line to which the positive terminal of the fuel cell is connected. A plurality of unidirectional switches, a first power supply line, and a plurality of bidirectional switches respectively connected to a third power supply line to which a negative electrode terminal of the secondary battery is connected.

  Preferably, the power conversion device includes a first capacitor provided between the first and second power supply lines in parallel with the first DC power supply, and a first and third power supply line in parallel with the second DC power supply. The control device further includes a second capacitor provided therebetween and a chopper circuit connected to the first to third power supply lines, and the control device steps down the power from the fuel cell or the power stored in the first capacitor. The chopper circuit is further controlled so as to be supplied to the secondary battery.

  Preferably, the electrical load is an AC rotary machine, and when the maximum electromotive voltage of the AC rotary machine during the regenerative operation of the AC rotary machine is equal to or lower than the voltage across the terminals of the secondary battery, the control device When the matrix converter is controlled so that electric power is directly supplied to the secondary battery, and when the maximum electromotive voltage of the AC rotating machine is higher than the voltage across the terminals of the secondary battery, the control device supplies the first and second capacitors. The matrix converter is controlled so that the regenerative power is temporarily stored, and then the chopper circuit is controlled so that the power stored in the first capacitor is stepped down and supplied to the secondary battery.

  Preferably, the chopper circuit includes a switch having one end connected to the second power supply line, a coil provided between the other end of the switch and the first power supply line, a connection point between the switch and the coil, and a third And a free-wheeling diode provided between the power supply line and having a cathode and an anode connected to the connection point and the third power supply line, respectively.

  Preferably, the power conversion device includes a first capacitor provided between the first and second power supply lines in parallel with the first DC power supply, and a first and third power supply line in parallel with the second DC power supply. A second capacitor provided therebetween, a fourth power supply line connected to the electric load, and a switch provided between the first and fourth power supply lines, wherein the electric load is an AC rotating machine The fourth power line is connected to the neutral point of the AC rotating machine, and the control device uses a chopper circuit configured by using the coil of the AC rotating machine, the fourth power line, a switch, and a matrix converter to generate fuel. The switch and the matrix converter are controlled so that the electric power from the battery or the electric power stored in the first capacitor is stepped down and supplied to the secondary battery.

  Preferably, when the maximum electromotive force of the AC rotating machine during the regenerative operation of the AC rotating machine is equal to or lower than the voltage across the terminals of the secondary battery, the control device directly supplies the regenerative power from the AC rotating machine to the secondary battery. When the matrix converter is controlled so that the maximum electromotive force of the AC rotating machine is higher than the voltage between the terminals of the secondary battery, the control device is configured so that regenerative power is temporarily stored in the first and second capacitors. The matrix converter is controlled, and then the switch is turned on, and the matrix converter is controlled so that the electric power stored in the first capacitor is stepped down by the chopper circuit and supplied to the secondary battery.

  Preferably, the chopper circuit includes at least one unidirectional switch for performing a chopper operation, an AC rotating machine coil, a fourth power supply line, a switch, a negative electrode of the secondary battery, an AC rotating machine coil, and A neutral point, a fourth power line, a switch, and at least one bidirectional switch connected to the third power line for circulating current to the positive electrode of the secondary battery via the first power line; Consists of.

  According to the invention, the vehicle includes any one of the power conversion devices described above.

  In the power conversion device according to the present invention, the first and second DC power supplies are connected in parallel to the matrix converter, and the negative terminal of the first DC power supply and the positive terminal of the second DC power supply are common first terminals. Therefore, the number of power supply lines for connecting the first and second DC power supplies to the matrix converter is reduced.

  Therefore, according to the present invention, the number of switches constituting the matrix converter is reduced as compared with the case where the first and second DC power supplies are simply connected in parallel to the matrix converter without using a common power line. The

  Further, according to the power conversion device of the present invention, the switch of the matrix converter connected to the second power supply line to which the positive terminal of the fuel cell constituting the first DC power supply is connected is configured by a unidirectional switch. Therefore, the number of power semiconductor elements constituting the matrix converter can be further reduced.

  In the power converter according to the present invention, the first and second capacitors and the chopper circuit are provided, and the controller is configured such that the maximum electromotive voltage during the regenerative operation of the AC rotating machine is higher than the voltage level of the secondary battery. When it is high, the matrix converter is controlled so that the regenerative power is temporarily stored in the first and second capacitors, and then the power stored in the first capacitor is stepped down and supplied to the secondary battery. Since the chopper circuit is controlled, the regenerative operation from the AC rotating machine to the secondary battery is executed even during high-speed rotation of the AC rotating machine where the voltage level of the regenerative power is high.

  Therefore, according to the present invention, the regenerative operation of the AC rotating machine can be realized at an arbitrary regenerative voltage, that is, at an arbitrary rotational speed, and as a result, the recovery efficiency of the regenerative power is improved.

  Further, in the power conversion device according to the present invention, the chopper circuit is configured using the coil of the AC rotating machine, the fourth power supply line, the switch, and the matrix converter, so that the chopper circuit is configured without providing the coil separately, By using this chopper circuit, the regenerative operation from the AC rotary machine to the secondary battery is executed even at the time of high-speed rotation of the AC rotary machine where the voltage level of the regenerative power becomes high.

  Therefore, according to the present invention, it is possible to realize the regenerative operation of the AC rotating machine at an arbitrary regenerative voltage, that is, at an arbitrary rotational speed, while suppressing an increase in the size of the apparatus for constituting the chopper circuit.

  Further, according to the vehicle according to the present invention, since the above-described power conversion device is provided, the downsizing and the improvement in quietness that are particularly strongly demanded in the vehicle are realized. Moreover, since the regenerative operation of the AC rotating machine can be realized in an arbitrary speed region, energy efficiency is improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
1 is an electric circuit diagram showing a configuration of a main part of a power system in a fuel cell vehicle equipped with a power conversion device according to Embodiment 1 of the present invention.

  Referring to FIG. 1, this power system 10 includes a fuel cell FC, a battery BAT, a motor generator MG, a matrix converter MC, capacitors C1 and C2, a unidirectional switch SAd, a reactor L, and a diode. D1, power supply lines LA to LD, La to Ld, and a control device 52 are provided.

  Fuel cell FC is connected to matrix converter MC via power supply lines LA and LB, and battery BAT is connected to matrix converter MC via power supply lines LB and LC. That is, the fuel cell FC and the battery BAT are connected to the matrix converter in parallel, and the power supply line LB is shared. A capacitor C1 is provided between the power supply lines LA and LB, and a capacitor C2 is provided between the power supply lines LB and LC.

  Motor generator MG is connected to matrix converter MC via power supply lines La to Lc. Unidirectional switch SAd is connected between power supply lines LA and LD, and reactor L is connected between power supply lines LD and LB. The diode D1 has an anode and a cathode connected to the power supply lines LC and Ld, respectively.

  The fuel cell FC is a DC power generation cell that obtains electric energy from chemical reaction energy generated by a chemical reaction between a fuel such as hydrogen and an oxidant. The fuel cell FC supplies the generated DC power to the matrix converter MC. The battery BAT is a secondary battery such as nickel metal hydride or lithium ion. Battery BAT supplies DC power to matrix converter MC and is charged by DC power received from matrix converter MC. The terminal voltage of the fuel cell FC is about 400V, for example, and the terminal voltage of the battery BAT is about 200V, for example.

  Motor generator MG is a three-phase AC synchronous motor generator, and has a rotor (not shown) having a plurality of permanent magnets on the outer peripheral surface and a stator (not shown) wound with a three-phase coil that forms a rotating magnetic field. Z). Motor generator MG operates as an electric motor that rotationally drives the rotor by the interaction between the magnetic field generated by the permanent magnet and the magnetic field formed by the three-phase coil, and the three-phase coil is generated by the interaction between the magnetic field generated by the permanent magnet and the rotation of the rotor. It operates as a generator that generates electromotive force at both ends.

  Matrix converter MC includes first and second switch groups 54 and 56. The first switch group 54 includes unidirectional switches SAa to SAc, and the second switch group 56 includes bidirectional switches SBa to SBc, SCa to SCc. Each switch SXy (“X” represents A to C and “y” represents a to c.) Is provided between the power supply lines LX and Ly, respectively, and corresponds to a control signal from the control device 52. Performs on / off operation.

  Each of the unidirectional switches SAa to SAc includes a power transistor and a diode connected in antiparallel thereto. The power transistor is made of, for example, an IGBT (Insulated Gate Bipolar Transistor). The configuration of the bidirectional switch will be described later.

  Matrix converter MC performs power conversion among fuel cell FC, battery BAT, and motor generator MG. Further, the matrix converter MC can connect the fuel cell FC and the battery BAT in series to increase the DC power supply voltage, convert the increased DC power into AC power, and output the AC power to the motor generator MG. . The operation of the matrix converter MC will be described in detail later for each power flow pattern among the fuel cell FC, the battery BAT, and the motor generator MG.

  As with the unidirectional switches SAa to SAc in the first switch group 54, the unidirectional switch SAd includes a power transistor made of, for example, an IGBT and a diode connected in reverse parallel thereto. The unidirectional switch SAd performs an on / off operation in response to a control signal from the control device 52.

  Unidirectional switch SAd, reactor L, and diode D1 constitute a chopper circuit. Specifically, when the unidirectional switch SAd, the reactor L, and the diode D1 supply power from the fuel cell FC or the capacitor C1 to the battery BAT, the DC voltage from the fuel cell FC or the capacitor C1 is changed to the voltage of the battery BAT. Step down to level. The operation of this chopper circuit will be described in detail later.

  Control device 52 inputs the torque command value of motor generator MG, each phase current value, and the output voltage of fuel cell FC and battery BAT, and calculates the voltage of each phase coil of motor generator MG. Here, each phase current value of motor generator MG is detected by a current sensor (not shown), and output voltages of fuel cell FC and battery BAT are detected by a voltage sensor (not shown).

  Based on the power flow pattern of power system 10 and the calculated voltage calculation result of each phase of motor generator MG, control device 52 supplies desired power from fuel cell FC or / and battery BAT to motor generator MG. The PWM signal for generating is generated, and the generated PWM signal is output to each switch SXy.

  Further, control device 52 detects the voltage of each phase of motor generator MG and the voltage between terminals of fuel cell and battery BAT, and supplies electric power from motor generator MG or fuel cell FC to battery BAT based on the detection result. A control signal for generating Then, the control device 52 outputs the generated control signal to each switch SXy, SAd. Here, the voltage of each phase of motor generator MG is detected by a voltage sensor (not shown).

  Note that the power flow pattern of the power system 10 and the specific operation of the power system 10 according to the power flow pattern will be described in detail later.

  First, the power system 10 is characterized in that the fuel cell FC and the battery BAT, which are connected in parallel to the matrix converter MC, are partially shared by the power supply line that connects the matrix converter MC. . That is, the negative electrode of the fuel cell FC and the positive electrode of the battery BAT are connected to the matrix converter MC by the common power supply line LB. With such a configuration, it is possible to reduce the number of switches constituting the matrix converter MC by one row. Further, it is possible to configure a power source in which the fuel cell FC and the battery BAT are connected in series without separately providing a connection switch or the like.

  The second feature is that the first switch group 54 is composed of unidirectional switches. In the fuel cell FC, since charging from the power supply line is not performed, the switching element for controlling the flow of power from the power supply lines La to Lc to the power supply line LA is deleted. Thereby, the number of power semiconductor elements constituting matrix converter MC is further reduced.

  A third feature is that a chopper circuit including a unidirectional switch SAd, a reactor L, and a diode D1 is provided. Thereby, as will be described later, it is possible to realize a regenerative operation from motor generator MG to battery BAT even during high-speed rotation when the power generation voltage of motor generator MG increases.

  In the above, battery BAT constitutes a “secondary battery”, and motor generator MG constitutes an “n-phase AC rotating machine”. The power supply lines LA to LC constitute a “second power supply line”, a “first power supply line”, and a “third power supply line”, respectively. Furthermore, the unidirectional switch SAd constitutes a “switch”, and the reactor L constitutes a “coil”.

  FIG. 2 is a circuit diagram showing a configuration of the bidirectional switch shown in FIG.

  Referring to FIG. 2, bidirectional switches SBa to SBc and SCa to SCc each include power transistors 62 and 66 and diodes 64 and 68. Power transistors 62 and 66 are made of IGBT, for example.

  Power transistor 62 has a collector and an emitter connected to terminal 70 and node ND1, respectively, and receives a control signal from control device 52 (not shown, the same applies hereinafter) as a base. The diode 64 is provided in antiparallel with the power transistor 62. Power transistor 66 has a collector and an emitter connected to terminal 72 and node ND2, respectively, and receives a control signal from control device 52 as a base. The diode 68 is provided in antiparallel with the power transistor 66. Nodes ND1 and ND2 are connected to each other, and terminals 70 and 72 are connected to two corresponding power supply lines, respectively.

  In this switch, when the control signal from the control device 52 is activated, both the power transistors 62 and 66 are turned on. When the terminal 70 has a higher voltage than the terminal 72, the power transistor 62 and the diode A current flows from terminal 70 to terminal 72 via 68. Here, since reverse bias is applied to the diode 64, no reverse current flows through the power transistor 66, and the power transistor 66 is protected. On the other hand, when the voltage at the terminal 72 is higher than that at the terminal 70, a current flows from the terminal 72 to the terminal 70 via the power transistor 66 and the diode 64. Here, since reverse bias is applied to the diode 68, no reverse current flows through the power transistor 62, and the power transistor 62 is protected.

  FIG. 3 is a circuit diagram showing another configuration of the bidirectional switch shown in FIG.

  Referring to FIG. 3, each of bidirectional switches SBa to SBc, SCa to SCc includes power transistors 82 and 86 and diodes 84 and 88. Power transistors 82 and 86 are made of IGBT, for example.

  Power transistor 82 has a collector and an emitter connected to the cathode and terminal 72 of diode 84, respectively, and receives a control signal from control device 52 (not shown, the same applies hereinafter) as a base. The diode 84 has an anode and a cathode connected to the terminal 70 and the power transistor 82, respectively. Power transistor 86 has a collector and an emitter connected to the cathode and terminal 70 of diode 88, respectively, and receives a control signal from control device 52 as a base. The diode 88 has an anode and a cathode connected to the terminal 72 and the power transistor 86, respectively.

  Also in this switch, when the control signal from the control device 52 is activated, both the power transistors 82 and 86 are turned on. When the terminal 70 has a higher voltage than the terminal 72, the diode 84 and the power transistor Current flows from terminal 70 to terminal 72 via 82. On the other hand, when the voltage at the terminal 72 is higher than that at the terminal 70, a current flows from the terminal 72 to the terminal 70 via the diode 88 and the power transistor 86.

  FIG. 4 is a circuit diagram showing still another configuration of the bidirectional switch shown in FIG.

  Referring to FIG. 4, each of bidirectional switches SBa to SBc, SCa to SCc is composed of power transistors 92 and 94 having a reverse blocking function, for example, an IGBT having a reverse blocking function. This IGBT with a reverse blocking function is an IBGT having a sufficient withstand voltage even when a reverse voltage is applied to the element.

  Power transistor 92 has a collector and an emitter connected to terminals 70 and 72, respectively, and receives a control signal from control device 52 (not shown, the same applies hereinafter) as a base. Power transistor 94 has a collector and an emitter connected to terminals 72 and 70, respectively, and receives a control signal from control device 52 as a base.

  Also in this switch, when the control signal from the control device 52 is activated, both the power transistors 92 and 94 are turned on, and when the terminal 70 has a higher voltage than the terminal 72, the power transistor 92 is passed through the power transistor 92. Thus, a current flows from the terminal 70 to the terminal 72. Here, a reverse bias is applied to the power transistor 94, but the power transistor 94 has a reverse breakdown voltage, so that the element is not destroyed. When the voltage at the terminal 72 is higher than that at the terminal 70, a current flows from the terminal 72 to the terminal 70 through the power transistor 94. Although a reverse bias is applied to the power transistor 92, the power transistor 92 also has a reverse breakdown voltage, so that the element is not destroyed.

5 to 28 are diagrams for explaining a specific operation and current flow of matrix converter MC according to the power flow pattern of power system 10 shown in FIG. 1. Here, the power system 10 includes the following six power flow patterns P1 to P6.
(P1) The fuel cell FC is powered (outputs power) and the motor generator MG is powered (P2) The fuel cell FC and the battery BAT are powered and the motor generator MG is powered (P3) The fuel cell FC is powered and the motor generator MG Is powering operation and battery BAT is regenerating (charging)
(P4) Motor generator MG is regenerative operation and battery BAT is regenerative (P5) Battery BAT is power running and motor generator MG is power running operation (P6) Fuel cell FC is power running and battery BAT is regenerated FIG. FIG. 6 is a block diagram showing a flow of power when the motor generator MG is in a power running operation, and FIG. 6 is an electric circuit diagram showing a flow of power in the power flow pattern P1 shown in FIG.

  Referring to FIGS. 5 and 6, control device 52 inputs the torque command value of motor generator MG, each phase current value, and the output voltage of fuel cell FC, and calculates the voltage of each phase coil of motor generator MG. To do. Then, control device 52 generates a PWM signal based on the calculated voltage calculation result of each phase of motor generator MG, and sends the generated PWM signal to unidirectional switches SAa to SAc and bidirectional switches SBa to SBc. Output.

  Then, each of unidirectional switches SAa to SAc and bidirectional switches SBa to SBc is turned on / off according to the PWM signal received from control device 52, and converts the DC voltage output from fuel cell FC into an AC voltage. Inverter operation is performed. Thereby, the DC power output from the fuel cell FC is converted into AC power by the matrix converter MC and supplied to the motor generator MG.

  In the power flow pattern P1, the other bidirectional switches SCa to SCc and the unidirectional switch SAd are always turned off.

  FIG. 7 is a block diagram showing a power flow when the fuel cell FC and the battery BAT are in power running and the motor generator MG is in a power running operation. FIG. 8 shows the power flow in the power flow pattern P2 shown in FIG. FIG. That is, in this power flow pattern P2, the fuel cell FC and the battery BAT are connected in series, and high voltage power is supplied to the motor generator MG.

  Referring to FIGS. 7 and 8, control device 52 inputs a torque command value of motor generator MG, each phase current value, and output voltages of fuel cell FC and battery BAT, and controls each phase coil of motor generator MG. Calculate the voltage. Then, control device 52 generates a PWM signal based on the calculated voltage calculation result of each phase of motor generator MG, and sends the generated PWM signal to unidirectional switches SAa to SAc and bidirectional switches SCa to SCc. Output.

  Then, each of unidirectional switches SAa to SAc and bidirectional switches SCa to SCc is turned on / off in accordance with the PWM signal received from control device 52, and power supply lines LA, which are output from fuel cell FC and battery BAT, An inverter operation for converting a DC voltage between LCs into an AC voltage is performed. As a result, high voltage DC power output from the fuel cell FC and the battery BAT between the power supply lines LA and LC is converted into AC power by the matrix converter MC and supplied to the motor generator MG.

  In the power flow pattern P2, the other bidirectional switches SBa to SBc and the unidirectional switch SAd are always turned off. Therefore, no current flows through the power supply line LB to which the negative electrode of the fuel cell FC and the positive electrode of the battery BAT are connected.

  FIG. 9 is a block diagram showing the flow of power when the fuel cell FC is in power running, the motor generator MG is in power running, and the battery BAT is regenerating, and FIGS. 10 and 11 are for the power flow pattern P3 shown in FIG. It is an electric circuit diagram which shows the flow of electric power. Here, at the time of this power flow pattern P3, the control device 52 executes the first and second operation modes by alternately switching them. 10 and 11 show the flow of power in the first and second operation modes, respectively.

  Referring to FIGS. 9 and 10, control device 52 calculates the voltage of each phase coil of motor generator MG in the first operation mode, similarly to power flow pattern P <b> 1. Then, control device 52 generates a PWM signal based on the calculated voltage calculation result of each phase of motor generator MG, and sends the generated PWM signal to unidirectional switches SAa to SAc and bidirectional switches SBa to SBc. Output. Thereby, in the first operation mode, the DC power output from the fuel cell FC is converted into AC power by the matrix converter MC and supplied to the motor generator MG.

  Referring to FIG. 11, control device 52 turns off unidirectional switches SAa to SAc in the second operation mode, and stops power supply from fuel cell FC to motor generator MG. Then, control device 52 generates a PWM signal for supplying electric power from motor generator MG to battery BAT based on each phase voltage of motor generator MG and the voltage between terminals of battery BAT, and the generated PWM signal is Output to bidirectional switches SBa to SBc, SCa to SCc.

  Then, each of bidirectional switches SBa to SBc and SCa to SCc is turned on / off according to the PWM signal received from control device 52, and rectifies the AC power output from motor generator MG to power supply lines La to Lc. Output to the battery BAT. Thereby, the battery BAT is charged.

  Thus, power is supplied from the fuel cell FC to the motor generator MG in the first operation mode, and power is supplied from the motor generator MG driven by the power from the fuel cell FC to the battery BAT in the second operation mode. Supplied. That is, power is supplied from fuel cell FC to battery BAT via motor generator MG. Controller 52 adjusts the voltage supplied to battery BAT to the voltage level of battery BAT by controlling the switching duty ratio between the first and second operation modes.

  12 and 13 are electric circuit diagrams for explaining another operation method in the power flow pattern P3 shown in FIG. Also in this operation method, as in the case of FIGS. 10 and 11, the first and second operation modes are alternately switched and executed. The first operation mode is the same as the operation shown in FIG. 10, and the second operation mode is different from the operation shown in FIG. Therefore, in FIGS. 12 and 13, only the second operation mode is shown.

  Referring to FIG. 12, control device 52 turns off each switch of matrix converter MC and turns on unidirectional switch SAd in the second operation mode. Then, current flows from the fuel cell FC to the reactor L via the unidirectional switch SAd. Referring to FIG. 13, when unidirectional switch SAd is turned off by control device 52, reactor L releases stored energy to power supply line LB, and a closed circuit indicated by an arrow in the figure is configured. As a result, the battery BAT is charged.

  As described above, the unidirectional switch SAd, the reactor L, and the diode D1 constitute a chopper circuit, and the battery BAT is charged by stepping down the output voltage from the fuel cell FC to the voltage level of the battery BAT.

  FIG. 14 is an electric circuit diagram for explaining still another operation method in the power flow pattern P3 shown in FIG. Also in this operation method, as in the case of FIGS. 10 and 11, the first and second operation modes are alternately switched and executed. The first operation mode is the same as the operation shown in FIG. 10, and the second operation mode is different from the operation shown in FIG. Therefore, in FIG. 14, only the second operation mode is shown.

  Referring to FIG. 14, control device 52 is in the second operation mode, for example, when current flows from power supply line Lc to power supply line Lb via a coil in motor generator MC as shown in the figure. A PWM signal is generated based on the line voltage between power supply lines Lb and Lc and the voltage of battery BAT, and the generated PWM signal is output to bidirectional switches SBb and SCc.

  Then, bidirectional switches SBb and SCc are turned on / off in accordance with the PWM signal received from control device 52, and the energy stored in the coil of motor generator MG is released to battery BAT to charge battery BAT. Here, control device 52 adjusts the power from motor generator MG to the voltage level of battery BAT by controlling the duty ratio of each of bidirectional switches SBb and SCc. Control device 52 switches a switch for performing PWM control in accordance with the line voltage of power supply lines La to Lc. Thereby, the battery BAT is stably charged.

  FIG. 15 is a block diagram showing the flow of electric power when motor generator MG is in the regenerative operation and battery BAT is in the regenerative mode. FIG. 16 is an electric circuit diagram showing the flow of electric power when motor generator MG rotates at a low speed in power flow pattern P4 shown in FIG. Here, when the maximum electromotive voltage during the regenerative operation of the motor generator MG is equal to or lower than the voltage level of the battery BAT, the low speed rotation is performed, and when the maximum electromotive voltage of the motor generator MG is higher than the voltage level of the battery BAT. Will be described later.

  Referring to FIGS. 15 and 16, when motor generator MG rotates at a low speed, control device 52 generates electric power from motor generator MG to battery BAT based on each phase voltage of motor generator MG and the voltage across terminals of battery BAT. A PWM signal to be supplied is generated, and the generated PWM signal is output to the bidirectional switches SBa to SBc and SCa to SCc.

  Then, each of bidirectional switches SBa to SBc and SCa to SCc is turned on / off according to the PWM signal from control device 52, and the AC power output from motor generator MG to power supply lines La to Lc is set to a predetermined value. The battery voltage is rectified and supplied to the battery BAT.

  FIGS. 17 to 19 are electric circuit diagrams showing the flow of power when motor generator MG rotates at high speed in power flow pattern P4 shown in FIG.

  Referring to FIG. 17, at the time of high-speed rotation of motor generator MG, control device 52 generates a PWM signal for outputting electric power from motor generator MG to capacitors C1 and C2 in the first operation mode. The PWM signal thus output is output to the bidirectional switches SCa to SCc.

  Then, each of bidirectional switches SCa to SCc is turned on / off according to the PWM signal from control device 52, and the electric power output from motor generator MG to power supply lines La to Lc is charged in capacitors C1 and C2. The The power supply from the power supply lines La to Lc to the capacitor C1 is performed via diodes in the unidirectional switches SAa to SAc.

  Referring to FIG. 18, in the second operation mode following the first operation mode described above, control device 52 turns off each switch of matrix converter MC and turns on unidirectional switch SAd. Then, a current flows from the capacitor C1 in which charges are stored in the first operation mode to the reactor L via the unidirectional switch SAd. Then, referring to FIG. 19, when unidirectional switch SAd is turned off by control device 52, reactor L releases stored energy to power supply line LB, and a closed circuit indicated by an arrow in the figure is configured. As a result, the battery BAT is charged.

  As described above, according to the first embodiment, the high-voltage generated power generated when the motor generator MG rotates at high speed is temporarily stored in the capacitors C1 and C2, and is configured by the unidirectional switch SAd, the reactor L, and the diode D1. By using the chopper circuit, the power stored in the capacitor C1 can be stepped down to charge the battery BAT. Therefore, in Embodiment 1, the regenerative operation of motor generator MG can be realized at an arbitrary voltage level.

  20 is a block diagram showing the flow of power when the battery BAT is in power running and the motor generator MG is in a power running operation, and FIG. 21 is an electric circuit diagram showing the flow of power in the power flow pattern P5 shown in FIG. It is.

  Referring to FIGS. 20 and 21, control device 52 inputs the torque command value of motor generator MG, each phase current value, and the output voltage of battery BAT, and calculates the voltage of each phase coil of motor generator MG. . Then, control device 52 generates a PWM signal based on the calculated voltage calculation result of each phase of motor generator MG, and outputs the generated PWM signal to bidirectional switches SBa to SBc, SCa to SCc.

  Then, each of bidirectional switches SBa to SBc and SCa to SCc is turned on / off according to the PWM signal received from control device 52, and performs an inverter operation for converting the DC voltage output from battery BAT into an AC voltage. . Thus, the DC power output from battery BAT is converted into AC power by matrix converter MC and supplied to motor generator MG.

  In the power flow pattern P5, the unidirectional switches SAa to SAd are always turned off.

  22 is a block diagram showing the flow of power when the fuel cell FC is powering and the battery BAT is regenerating, and FIGS. 23 and 24 are electric diagrams showing the flow of power in the power flow pattern P6 shown in FIG. It is a circuit diagram.

  Referring to FIGS. 22 and 23, control device 52 turns off each switch of matrix converter MC and turns on unidirectional switch SAd. Then, current flows from the fuel cell FC to the reactor L via the unidirectional switch SAd. Then, referring to FIG. 24, when unidirectional switch SAd is turned off by control device 52, reactor L releases the stored energy to power supply line LB, and a closed circuit indicated by an arrow in the figure is configured. As a result, the battery BAT is charged.

  That is, also in the power flow pattern P6, as described above, the DC voltage from the fuel cell FC is stepped down by the chopper circuit formed by the unidirectional switch SAd, the reactor L, and the diode D1, and the battery BAT is charged. .

  25 and 26 are electric circuit diagrams for explaining another operation method in the power flow pattern P6 shown in FIG. In this operation method, a chopper circuit is configured using a coil of motor generator MG instead of reactor L.

  Referring to FIG. 25, for example, when using a coil of motor generator MG connected to power supply lines Lb and Lc instead of reactor L, control device 52 includes unidirectional switch SAc and first direction switch SAc in the first operation mode. The bidirectional switch SBb is turned on. Then, a closed circuit is configured as indicated by the arrows in the figure, and the electric power from the fuel cell FC is temporarily stored in the coil of the motor generator MG.

  Referring to FIG. 26, control device 52 turns off unidirectional switch SAd and turns on bidirectional switches SBb and SCc in the second operation mode following the first operation mode. Then, a closed circuit is configured as indicated by the arrows in the figure, and the energy stored in the coil of motor generator MG is released to battery BAT, and battery BAT is charged.

  Thus, in this operation method, the unidirectional switch SAc, the bidirectional switches SBb and SCc, and the motor generator MG coil constitute a chopper circuit, and the DC voltage from the fuel cell FC is stepped down by this chopper circuit. The battery BAT is charged.

  In the case where other coils of motor generator MG are used instead of reactor L, charging from fuel cell FC to battery BAT can be realized in the same manner as described above.

  27 and 28 are electric circuit diagrams for explaining still another operation method at the time of the power flow pattern P6 shown in FIG.

  Referring to FIG. 27, in the first operation mode, control device 52 detects rotation angle θ of motor generator MG by a rotation position sensor of motor generator MG (not shown), and based on the detected rotation angle θ, A PWM signal is generated so as to obtain a voltage pattern in which the q-axis current for motor generator MG is zero. Then, control device 52 outputs the generated PWM signal to unidirectional switches SAa to SAc and bidirectional switches SBa to SBc. Here, the reason why such a PWM signal is generated is to prevent a power flow from the fuel cell FC to the motor generator MG.

  Each of unidirectional switches SAa to SAc and bidirectional switches SBa to SBc is turned on / off in accordance with a PWM signal received from control device 52, and converts a DC voltage output from fuel cell FC into an AC voltage. Perform the action. As a result, the DC power output from the fuel cell FC is converted into AC power by the matrix converter MC, and the converted power is temporarily stored in the coil of the motor generator MG without causing the motor generator MG to generate rotational force. Is done.

  Referring to FIG. 28, control device 52 turns off unidirectional switches SAa to SAc in the second operation mode following the first operation mode. Then, control device 52 generates a PWM signal for supplying power from motor generator MG to battery BAT based on the voltage of each phase of motor generator MG and the voltage between terminals of battery BAT, and the generated PWM signal Are output to the bidirectional switches SBa to SBc and SCa to SCc.

  Then, each of bidirectional switches SBa to SBc and SCa to SCc is turned on / off according to the PWM signal received from control device 52, and rectifies the AC power output from motor generator MG to power supply lines La to Lc. Supplied to the battery BAT. Thereby, the battery BAT is charged.

  As described above, in the operation method shown in FIGS. 27 and 28, similarly to the operation method shown in FIGS. 25 and 26, the electric power from the fuel cell FC is temporarily stored in the coil of the motor generator MG, and then the battery Although supplied to the BAT, in the operation method shown in FIG. 25 and FIG. 26, a rotational force is generated in the motor generator MG, whereas in the operation method shown in FIG. 27 and FIG. Since the matrix converter MC is PWM controlled so that a voltage pattern in which the q-axis current of the generator MG becomes zero is generated, no rotational force is generated in the motor generator MG.

  As described above, according to the first embodiment, since the negative electrode of the fuel cell FC and the positive electrode of the battery BAT are connected to the matrix converter MC using the common power supply line LB, the fuel cell FC and the battery BAT are simply connected. Compared to the case where the matrix converter is connected in parallel, the number of switches constituting the matrix converter can be reduced.

  In addition, since the fuel cell FC is not regenerated (charged), the switch connected to the power supply line LA is formed of a unidirectional switch, so that the number of power semiconductor elements constituting the matrix converter MC can be further reduced.

  Further, since the chopper circuit configured by the unidirectional switch SAd, the reactor L, and the diode D1 is provided, the regenerative power is transferred to the battery BAT by the chopper circuit even at high speed rotation of the motor generator MG where the voltage level of the regenerative power becomes high. By stepping down to the voltage level, regeneration control from the motor generator MG to the battery BAT can be executed. Therefore, regenerative operation of motor generator MG can be realized at an arbitrary rotational speed.

[Embodiment 2]
Although the reactor L is provided in the first embodiment, in the second embodiment, the reactor L in the first embodiment is connected to the neutral point of the motor generator MG by connecting the matrix converter MC to the neutral point of the motor generator MG. A configuration in which a coil is substituted is shown.

  FIG. 29 is an electric circuit diagram showing a configuration of a main part of the power system in the fuel cell vehicle equipped with the power conversion device according to Embodiment 2 of the present invention.

  Referring to FIG. 29, power system 10A is replaced with unidirectional switch SAd, reactor L, diode D1, and power supply lines LD, Ld in the configuration of power system 10 in the first embodiment shown in FIG. The bidirectional switch SBe, the diode D2, and the power supply line Le are provided.

  Bidirectional switch SBe is connected between diode D2 and power supply line LB. The diode D2 has an anode and a cathode connected to the bidirectional switch SBe and the power supply line LA, respectively. Power supply line Le connects the connection point between bidirectional switch SBe and diode D2 to the neutral point of motor generator MG.

  Bidirectional switch SBe performs an on / off operation in response to a control signal from control device 52. Here, also in the power system 10A according to the second embodiment, the above-described six power flow patterns P1 to P6 exist as in the power system 10 according to the first embodiment. And bidirectional switch SBe is always turned off in the power flow pattern P3 in which reactor L is used in the above-described first embodiment and the operation pattern other than the high speed rotation of motor generator MG in power flow pattern P4. .

  Therefore, the operation of power system 10A corresponding to the operation pattern when reactor L is not used in the first embodiment is the same as the operation of power system 10 in the first embodiment. Therefore, hereinafter, the operation of power system 10A corresponding to the operation pattern in which reactor L is used in the first embodiment will be described.

  30 and 31 are electric circuit diagrams showing the flow of power in the power flow pattern P3 of the power system 10A according to the second embodiment. Also in this power system 10A, as in the case of power flow pattern P3 in the first embodiment, the first and second operation patterns are alternately switched and executed. The first operation mode is basically the same as the operation shown in FIG. 10, and the second operation mode is different from the operation shown in FIG. Therefore, in FIG. 30 and FIG. 31, only the second operation mode is shown.

  Referring to FIG. 30, in the second operation mode, control device 52 turns on unidirectional switch SAa and bidirectional switch SBe, for example, in response to turning on unidirectional switch SAa. The directional switches SBa and SCb are turned on. Then, from the positive electrode of the fuel cell FC, the unidirectional switch SAa, the power supply line La, the bidirectional switch SBa, the battery BAT, the bidirectional switch SCb, the power supply line Lb, the motor generator coil and neutral point, the power supply line Le, In addition, a closed circuit that returns to the negative electrode of the fuel cell FC via the bidirectional switch SBe is configured, and energy is stored in the coil of the motor generator MG.

  Referring to FIG. 31, when unidirectional switch SAa and bidirectional switch SBa are turned off by control device 52 (bidirectional switches SCb and SBe remain on), the arrows in the figure. The closed circuit shown is configured, and the energy stored in the coil of the motor generator MG is supplied to the battery BAT via the bidirectional switch SBe.

  That is, in the second embodiment, a unidirectional switch SAa, a coil of motor generator MG, and a bidirectional switch SCb constitute a chopper circuit, and the output voltage from fuel cell FC is stepped down to a predetermined battery voltage. The battery BAT is charged.

  32 to 34 are electric circuit diagrams showing the flow of electric power when motor generator MG rotates at high speed in power flow pattern P4 of electric power system 10A according to the second embodiment.

  Referring to FIG. 32, at the time of high-speed rotation of motor generator MG, control device 52 generates a PWM signal for outputting electric power from motor generator MG to capacitors C1 and C2 in the first operation mode. The PWM signal thus output is output to the bidirectional switches SCa to SCc.

  Then, each of bidirectional switches SCa to SCc is turned on / off according to the PWM signal from control device 52, and the electric power output from motor generator MG to power supply lines La to Lc is charged in capacitors C1 and C2. The The power supply from the power supply lines La to Lc to the capacitor C1 is performed via diodes in the unidirectional switches SAa to SAc.

  Referring to FIG. 33, in the second operation mode following the first operation mode described above, control device 52 turns on bidirectional switch SBe. Then, for example, the control device 52 turns on the unidirectional switch SAa and turns on the bidirectional switches SBa and SCb in response to turning on the unidirectional switch SAa.

  Then, from the capacitor C1, the unidirectional switch SAa, the power supply line La, the bidirectional switch SBa, the battery BAT, the bidirectional switch SCb, the power supply line Lb, the motor generator coil and neutral point, the power supply line Le, and the bidirectional The closed circuit returning to the capacitor C1 via the directional switch SBe is configured, and a current flows from the capacitor C1 in which the electric charge is stored in the first operation mode to the coil of the motor generator MG.

  Referring to FIG. 34, when unidirectional switch SAa and bidirectional switch SBa are turned off by control device 52 (bidirectional switches SCb and SBe remain on), motor generator MG The coil releases the stored energy to the power supply line Le connected to the neutral point, and the battery BAT is charged by forming a closed circuit indicated by an arrow in the figure.

  Thus, in the first operation mode, the high voltage regenerative power from the motor generator MG is temporarily stored in the capacitors C1 and C2, and in the second operation mode, the unidirectional switch SAa, the coil of the motor generator MG, Further, the DC voltage from the capacitor C1 is stepped down by the chopper circuit constituted by the bidirectional switch SCb, whereby the regenerative operation of the motor generator MG is realized even at high speed rotation.

  In the power flow pattern P4, the operation of power system 10A when motor generator MG rotates at a low speed is the same as the operation of power system 10 in the first embodiment.

  In the above description, the coil of the motor generator MG connected to the power supply line Lb is used as the coil constituting the chopper circuit. However, other coils of the motor generator MG may be used. In that case, the control device 52 may appropriately perform PWM control of the corresponding switches of the first and second switch groups 54 and 56 based on the same idea as described above.

  In the above description, the coil for one phase of the motor generator MG is used when configuring the chopper circuit. However, the unidirectional switches SAa to SAc in the first switch group 54 are simultaneously turned on, and then The zero-phase reactance of the motor generator MG may be used by turning off the unidirectional switches SAa to SAc and simultaneously turning on the bidirectional switches SCa to SCc (the unidirectional switch SBe is always on). .) In this case, unnecessary torque is not generated in motor generator MG.

  As described above, according to the second embodiment, the matrix converter MC is connected to the neutral point of the motor generator MG, and the chopper circuit is configured using the coil of the motor generator MG, so that the chopper circuit is configured. It is not necessary to provide a separate reactor, and an increase in the size of the apparatus can be suppressed. Also in the second embodiment, similarly to the first embodiment, the regenerative control from the motor generator MG to the battery BAT can be executed at the time of high speed rotation of the motor generator MG where the voltage level of the regenerative power becomes high. Therefore, regenerative operation of motor generator MG can be realized at an arbitrary rotational speed.

[Embodiment 3]
FIG. 35 is an electric circuit diagram showing the configuration of the main part of the power system in the fuel cell vehicle equipped with the power conversion device according to Embodiment 3 of the present invention.

  Referring to FIG. 35, power system 10B includes unidirectional switch SAd, reactor L, diode D1, and power supply lines LD, Ld in the configuration of power system 10 according to the first embodiment shown in FIG. It has no configuration.

  Since power system 10B cannot form a chopper circuit like power systems 10 and 10A in the first and second embodiments, regenerative operation cannot be performed during high-speed rotation of motor generator MG in power flow pattern P4. However, since the reactor L, the bidirectional switch SBe, and the like for configuring the chopper circuit are not provided, the power converter can be most miniaturized as compared with the first and second embodiments.

  Since operation of power system 10B is the same as each operation other than the operation using the chopper circuit in the first embodiment, description thereof will not be repeated.

  As described above, according to the third embodiment, the regenerative operation of motor generator MG cannot be realized at an arbitrary rotational speed, but the apparatus can be further downsized as compared with the first and second embodiments.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram showing a configuration of a main part of a power system in a fuel cell vehicle equipped with a power conversion device according to Embodiment 1 of the present invention. It is a circuit diagram which shows the structure of the bidirectional | two-way switch shown in FIG. It is a circuit diagram which shows the other structure of the bidirectional switch shown in FIG. FIG. 6 is a circuit diagram showing still another configuration of the bidirectional switch shown in FIG. 1. It is a block diagram which shows the flow of the electric power when a fuel cell is powering and a motor generator is powering operation. FIG. 6 is an electric circuit diagram showing a flow of electric power in the power flow pattern P1 shown in FIG. It is a block diagram which shows the flow of the electric power when a fuel cell and a battery are power running, and a motor generator is power running operation. It is an electric circuit diagram which shows the flow of the electric power at the time of the power flow pattern P2 shown in FIG. It is a block diagram which shows the flow of the electric power when a fuel cell is power running, a motor generator is power running operation, and a battery is regenerated. FIG. 10 is a first electric circuit diagram showing a flow of electric power in the power flow pattern P3 shown in FIG. 9. FIG. 10 is a second electric circuit diagram showing a flow of electric power in the power flow pattern P3 shown in FIG. FIG. 10 is a first electric circuit diagram for explaining another operation method at the time of the power flow pattern P3 shown in FIG. 9. FIG. 10 is a second electric circuit diagram for explaining another operation method at the time of the power flow pattern P3 shown in FIG. 9. FIG. 10 is an electric circuit diagram for explaining still another operation method at the time of the power flow pattern P3 shown in FIG. 9. It is a block diagram which shows the flow of the electric power at the time of a motor generator regenerative operation and a battery regeneration. FIG. 16 is an electric circuit diagram showing a flow of electric power when the motor generator rotates at a low speed in the power flow pattern P4 shown in FIG. FIG. 16 is a first electric circuit diagram showing a flow of electric power when the motor generator rotates at high speed in the power flow pattern P4 shown in FIG. 15; FIG. 16 is a second electric circuit diagram showing a flow of electric power when the motor generator rotates at high speed in the power flow pattern P4 shown in FIG. FIG. 16 is a third electric circuit diagram showing a flow of electric power when the motor generator rotates at high speed in the power flow pattern P4 shown in FIG. It is a block diagram which shows the flow of the electric power when a battery is power running and a motor generator is power running. It is an electric circuit diagram which shows the flow of the electric power at the time of the power flow pattern P5 shown in FIG. It is a block diagram which shows the flow of the electric power when a fuel cell is power running and a battery is regenerated. FIG. 23 is a first electric circuit diagram showing a flow of electric power in the power flow pattern P6 shown in FIG. FIG. 23 is a second electric circuit diagram showing a flow of electric power in the power flow pattern P6 shown in FIG. FIG. 23 is a first electric circuit diagram for explaining another operation method at the time of the power flow pattern P6 shown in FIG. 22; FIG. 23 is a second electric circuit diagram for explaining another operation method at the time of the power flow pattern P6 shown in FIG. FIG. 23 is a first electric circuit diagram for explaining still another operation method at the time of the power flow pattern P6 shown in FIG. FIG. 23 is a second electric circuit diagram for explaining still another operation method at the time of the power flow pattern P6 shown in FIG. It is an electric circuit diagram which shows the structure of the principal part of the electric power system in the fuel cell vehicle by which the power converter device by Embodiment 2 of this invention is mounted. It is a 1st electric circuit diagram which shows the flow of the electric power at the time of the power flow pattern P3 of the electric power system by this Embodiment 2. FIG. It is a 2nd electric circuit diagram which shows the flow of the electric power at the time of the power flow pattern P3 of the electric power system by this Embodiment 2. FIG. FIG. 10 is a first electric circuit diagram showing a flow of power when the motor generator rotates at high speed in the power flow pattern P4 of the power system according to the second embodiment. FIG. 10 is a second electric circuit diagram showing a flow of electric power when the motor generator rotates at high speed in the power flow pattern P4 of the electric power system according to the second embodiment. FIG. 10 is a third electric circuit diagram showing a flow of electric power when the motor generator rotates at high speed in the power flow pattern P4 of the electric power system according to the second embodiment. It is an electric circuit diagram which shows the structure of the principal part of the electric power system in the fuel cell vehicle by which the power converter device by Embodiment 3 of this invention is mounted.

Explanation of symbols

  10, 10A, 10B Power system, 52 control device, 54 first switch group, 56 second switch group, 62, 66, 82, 86, 92, 94 power transistor, 64, 68, 84, 88, D1, D2 diode, 70, 72 terminals, MC matrix converter, FC fuel cell, BAT battery, MG motor generator, C1, C2 capacitor, L reactor, LA to LD, La to Le power line, SAa to SAd unidirectional switch, SBa ~ SBc, SCa ~ SCc, SBe Bidirectional switch.

Claims (9)

  1. A matrix converter connected to the first and second DC power sources and the electric load, and performing power conversion between the first DC power source, the second DC power source and the electric load;
    A control device for controlling the operation of the matrix converter;
    The first and second DC power supplies are connected in parallel to the matrix converter,
    The negative power terminal of the first DC power supply and the positive terminal of the second DC power supply are connected to the matrix converter via a common first power supply line.
  2. The first DC power source is a fuel cell;
    The second DC power source is a secondary battery,
    The matrix converter is
    A plurality of unidirectional switches connected to a second power supply line to which the positive terminal of the fuel cell is connected;
    2. The power conversion device according to claim 1, further comprising: a plurality of bidirectional switches respectively connected to the first power supply line and a third power supply line to which a negative electrode terminal of the secondary battery is connected.
  3. A first capacitor provided between the first and second power supply lines in parallel with the first DC power supply;
    A second capacitor provided between the first and third power supply lines in parallel with the second DC power supply;
    A chopper circuit connected to the first to third power supply lines,
    The control device further controls the chopper circuit so that power from the fuel cell or power stored in the first capacitor is stepped down and supplied to the secondary battery. 2. The power conversion device according to 2.
  4. The electrical load is an AC rotating machine,
    When the maximum electromotive force of the AC rotating machine during the regenerative operation of the AC rotating machine is equal to or lower than the voltage across the terminals of the secondary battery,
    The control device controls the matrix converter so that regenerative power from the AC rotating machine is directly supplied to the secondary battery,
    When the maximum electromotive voltage of the AC rotating machine is higher than the inter-terminal voltage of the secondary battery,
    The control device controls the matrix converter so that the regenerative power is temporarily stored in the first and second capacitors, and then reduces the power stored in the first capacitor to reduce the second power. The power converter according to claim 3, wherein the chopper circuit is controlled so as to be supplied to a secondary battery.
  5. The chopper circuit is
    A switch having one end connected to the second power supply line;
    A coil provided between the other end of the switch and the first power supply line;
    4. A free-wheeling diode provided between a connection point of the switch and the coil and the third power supply line, and having a cathode and an anode connected to the connection point and the third power supply line, respectively. Or the power converter device of Claim 4.
  6. A first capacitor provided between the first and second power supply lines in parallel with the first DC power supply;
    A second capacitor provided between the first and third power supply lines in parallel with the second DC power supply;
    A fourth power supply line connected to the electrical load;
    A switch provided between the first and fourth power supply lines,
    The electrical load is an AC rotating machine,
    The fourth power line is connected to a neutral point of the AC rotating machine;
    The control device is stored in the electric power from the fuel cell or the first capacitor by a chopper circuit configured using the coil of the AC rotating machine, the fourth power supply line, the switch, and the matrix converter. The power conversion device according to claim 1 or 2, wherein the switch and the matrix converter are controlled so as to step down the power supplied to the secondary battery.
  7. When the maximum electromotive force of the AC rotating machine during the regenerative operation of the AC rotating machine is equal to or lower than the voltage across the terminals of the secondary battery,
    The control device controls the matrix converter so that regenerative power from the AC rotating machine is directly supplied to the secondary battery,
    When the maximum electromotive voltage of the AC rotating machine is higher than the inter-terminal voltage of the secondary battery,
    The control device controls the matrix converter so that the regenerative power is temporarily stored in the first and second capacitors, and then turns on the switch and is stored in the first capacitor. The power converter according to claim 6, wherein the matrix converter is controlled so that power is stepped down by the chopper circuit and supplied to the secondary battery.
  8. The chopper circuit is
    At least one unidirectional switch for chopper operation;
    A coil of the AC rotating machine;
    The fourth power line;
    The switch;
    In order to return current from the negative electrode of the secondary battery to the positive electrode of the secondary battery via the coil and neutral point of the AC rotating machine, the fourth power supply line, the switch, and the first power supply line. The power conversion device according to claim 6, comprising: at least one bidirectional switch connected to the third power supply line.
  9.   The vehicle provided with the power converter device of any one of Claims 1-8.
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