JP2015198541A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device in which power can be exchanged between unit batteries regardless of whether a motor is driven or stopped.SOLUTION: A power conversion device includes a battery pack 10 as a serial connection body of unit batteries Eh, power storage means 14 and a three-phase motor 17, exchanges power between the battery pack 10 and the power storage means 14 and supplies power from the battery pack 10 to the three-phase motor 17. The power conversion device also includes: three lines of buses 12; a plurality of first opening/closing means units SAh for opening/closing paths connecting the neighboring unit batteries Eh and both terminals of the battery pack 12 to the buses 12 in a bidirectional manner, respectively; and second opening/closing means SBi provided at first terminal sides of the buses 12 for opening/closing paths connecting a positive electrode and a negative electrode of the power storage means 14 to the buses 12 in a bidirectional manner, respectively. At second terminal sides opposite to the first terminal sides of the buses 12, the buses 12 are connected to the three-phase motor 17.

Description

  The present invention relates to a power conversion device that supplies power to a motor from an assembled battery including a plurality of unit batteries.

  There exists a power converter device of patent document 1 as what drives a three-phase motor with the electric power supplied from the DC voltage source which outputs three electric potentials. In the power conversion device described in Patent Document 1, a DC voltage source that outputs three or more potentials and a three-phase motor are connected via switching elements, and the switching elements of each potential are selectively connected, By controlling the PWM signal between the potentials, a multiphase AC voltage is output from each potential, and the multiphase AC motor is driven.

Japanese Patent No. 4111175

  In the power conversion device described in Patent Document 1, when the motor is driven, the switching element is controlled to open and close in order to connect the DC voltage source and each phase of the motor. You cannot give or receive. That is, although power can be selectively supplied to the three-phase motor by the switching element, a plurality of DC voltage sources are connected by switching control of the switching element while supplying power to the three-phase motor. Therefore, power cannot be transferred between a plurality of DC voltage sources.

  In addition, when the motor is stopped, it is possible to transfer power between a plurality of DC voltage sources by using the motor winding as a reactor and selectively opening and closing the switching elements. However, since the motor winding is not originally intended to be used as a reactor, the efficiency of power transfer is low.

  The present invention has been made to solve the above-described problems, and a main object thereof is a power conversion device that supplies power to a motor from an assembled battery composed of a plurality of unit batteries, and is related to when the motor is driven and when the motor is stopped. First, an object of the present invention is to provide a power converter capable of transferring power between unit batteries.

  The present invention includes an assembled battery as a series connection body of unit batteries that are one or a plurality of adjacent battery cells, a power storage means for storing electric energy, and an m (≧ 3) phase motor, and the battery pack and the power storage means. Is a power conversion device that transfers power to and from the assembled battery and supplies power to the m-phase motor, between the bus composed of m rows of electrical wiring, adjacent unit cells, and the assembled battery A plurality of first opening / closing means for opening and closing a path connecting both ends of each of the electric wires to one of the electrical wirings of the bus, and a first end side of the bus. A second opening / closing means that opens and closes a path connected to any one of the electrical wirings, and on the second end side opposite to the first end side of the bus, each electrical wiring of the bus is connected to different phases of m-phase motor And wherein the Rukoto.

  According to the above configuration, power output from one or a plurality of unit cells is input to the bus via the first opening / closing means, and power having the same potential is output from the first end side and the second end side of the bus. Will be. Therefore, by selectively opening / closing the first opening / closing means and selectively opening / closing the second opening / closing means, one or a plurality of unit batteries and the power storage means can be connected to exchange power. On the other hand, electric power can be supplied to each phase of the m-phase motor by selective opening / closing control of the first opening / closing means. Therefore, it is possible to transfer power between the unit battery and the power storage means while supplying power to the m-phase motor. Even when power is not supplied to the m-phase motor, the power is supplied via the m-phase motor. In addition, power can be exchanged between the unit battery and the power storage means. Therefore, power can be exchanged between the assembled battery and the power storage means regardless of whether the motor is driven or stopped.

It is a circuit diagram of the power converter concerning a 1st embodiment. In the power converter device which concerns on 1st Embodiment, it is an equivalent circuit at the time of supplying electric power from an assembled battery to a capacitor | condenser. In the power converter device which concerns on 1st Embodiment, it is an equivalent circuit at the time of supplying electric power from a capacitor | condenser to an assembled battery. It is a circuit diagram of the power converter device concerning a 2nd embodiment. It is a circuit diagram of the power converter device which concerns on 3rd Embodiment.

  Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the description of the same reference numerals is used.

<First Embodiment>
The power converter according to the present embodiment is mounted on a vehicle having a motor that supplies driving force to driving wheels. FIG. 1 is a circuit diagram of the power conversion device according to the present embodiment. Each unit battery Eh (h = 1, 2, 3,..., N) is composed of one or a plurality of adjacent battery cells, and the assembled battery 10 is configured as a series connection body of the plurality of unit batteries Eh. Yes. Each unit battery Eh is, for example, a lithium ion storage battery, and its terminal voltage is about 3V.

  The assembled battery 10 is connected to a bus 12, which is a three-row electric wiring, via a first switch element group 11. The first end side of the bus 12 is connected via a second switch element group 13 to a capacitor 14 that is a power storage means for storing electrical energy. On the other hand, the second end side of the bus 12 opposite to the first end side is connected to the three-phase motor 17 via the third switching element group 16. Further, output terminals 15a and 15b are connected in parallel to the capacitor 14, and a DC voltage can be output from the assembled battery 10 to the output terminals 15a and 15b.

  The first open / close element group 11 includes n + 1 first open / close elements SAh (h = 1, 2, 3,..., N + 1) which are first open / close means. The bus 12 is composed of a first bus B1, a second bus B2, and a third bus B3, which are electrical wiring. The second opening / closing element group 13 includes second opening / closing elements SBi (i = 1, 2, 3, 4, 5, 6) which are three second opening / closing means. The third open / close element group 16 includes six third open / close elements SCj (j = 1, 2, 3) as six third open / close means. The first open / close element SAh, the second open / close element SBi, and the third open / close element SCj are two MOSFETs connected in series in opposite directions, and are capable of flowing a current in both directions. It is possible to shut off. The three-phase motor 17 includes a u-phase 17u, a v-phase 17v, and a w-phase 17w. The first opening / closing element SAh has the assembled battery 10 side as the first end, the bus 12 side as the second end, and the second opening / closing element SBi has the bus 12 side as the first end and the capacitor 14 side as the second end. The third switching element SCj has a first end on the bus 12 side and a second end on the three-phase motor 17 side.

  The first end of the first opening / closing element SA1 is connected to the positive electrode of the unit battery E1, that is, the positive electrode end of the assembled battery 10. The first end of the first opening / closing element SA2 is connected between the unit battery E1 and the unit battery E2. Similarly, the first end of the first opening / closing element SAk (2 ≦ k ≦ n) is connected between the unit battery Ek and the unit battery E (k + 1), and the first end of the first opening / closing element SA (n + 1). Is connected to the negative electrode of the unit battery En, that is, the negative electrode end of the assembled battery 10.

  The second end of the first opening / closing element SA1 is connected to the first bus B1, and the second end of the first opening / closing element SA2 is connected to the second bus B2. Similarly, the second end of the first switching element SAk (2 ≦ k ≦ n + 1) is connected to any one of the first bus B1, the second bus B2, and the third bus B3. The connection destinations of the second ends of the adjacent first opening / closing elements SAh are different from each other.

  The first end of the second switch element SB1 and the first end of the second switch element SB2 are connected to the first end side of the third bus B3, and the first end of the second switch element SB3 and the second switch element SB4 are connected. The first end is connected to the first end side of the second bus B2, and the first end of the second opening / closing element SB5 and the first end of the second opening / closing element SB6 are connected to the first end side of the first bus B1. Has been. On the other hand, the second end of the second switch SB1, the second end of the second switch SB3, and the second end of the second switch SB5 are connected to the first end of the capacitor 14, and the second switch SB2 , The second end of the second switching element SB4, and the second end of the second switching element SB6 are connected to the second end of the capacitor 14 opposite to the first end.

  The first end of the third opening / closing element SC1 is connected to the second end side of the first bus B1, and the second end of the third opening / closing element SC1 is connected to the u-phase 17u of the three-phase motor 17. The first end of the third opening / closing element SC2 is connected to the second end side of the second bus B2, and the second end of the third opening / closing element SC2 is connected to the v-phase 17v of the three-phase motor 17. The first end of the third opening / closing element SC3 is connected to the second end side of the third bus B3, and the second end of the third opening / closing element SC3 is connected to the w-phase 17w of the three-phase motor 17.

  The voltage of each unit battery Eh is measured by the voltage sensing means 18 and input to the control device 19. The control device 19 includes a connection control means 19a and an opening / closing control means 19b, and outputs a control signal to the gate drive circuit 20 that performs opening / closing driving of each opening / closing element.

  The connection control means 19a performs calculation based on the inputted voltage of each unit battery Eh, and performs equalization control. That is, the first opening / closing element SAh and the second opening / closing element SBi that perform the opening / closing control are selected so that the voltages of the unit batteries Eh are equal. Then, the selection result is transmitted to the opening / closing control means 19b, and the opening / closing control means 19b generates a control signal based on the selection result and outputs it to the gate drive circuit 20.

  In addition, the connection control means 19a connects three pairs of second ends to the first bus B1, the second bus B2, and the third bus B3 so as to include the first opening / closing element SAh selected in the equalization control. The first opening / closing element SAh is selected. And the three-phase inverter circuit which arranged unit battery Eh between phases is constituted. Here, since the unit battery Eh is arranged between phases in the three-phase inverter circuit, the voltages applied to the respective phases are different. Therefore, based on the voltage of each unit battery Eh measured by the voltage sensing means 18, the voltage applied between the phases is calculated. Then, based on the calculated voltage, the switching ratio of the first PWM signal for controlling the first switching element SAh selected by the switching control means 19b is changed, and the voltage applied between the phases of the three-phase motor 17 is 1 / A three-phase AC voltage having a three-cycle deviation and the same peak value is assumed.

  On the other hand, the opening / closing control means 19b has the second closing time so that the closing period of the first opening / closing element SAh and the closing period of the second opening / closing element SBi selected by the connection control means 19a for equalization control are equal. The second PWM signal is transmitted to the opening / closing element SBi. The duty ratio of the second PWM signal is changed based on the first PWM signal so that the voltage input to the capacitor 14 becomes a DC voltage. It is also possible to output a desired DC voltage from the output terminals 15a and 15b by controlling the time ratio between the first PWM signal and the second PWM signal.

  2, in the power conversion device according to the present embodiment shown in FIG. 1, it is determined that the voltages of the unit batteries E (n−1) and the unit batteries E (n−2) are high, that is, the remaining capacity is large. It is an equivalent circuit when power is supplied from the unit battery E (n-1) and the unit battery E (n-2) to the capacitor 14.

  The connection control unit 19a selects the first switching element SA (n-2), the first switching element SAn, the second switching element SB1, and the second switching element SB4 for the equalization operation. Then, the positive electrode of the unit battery E (n−2) is connected to the first end of the capacitor 14 by closing the first switching element SA (n−2) and the second switching element SB1. In addition, the first open / close element SAn and the second open / close element SB4 are closed to connect the negative electrode of the unit battery E (n−1) to the second end of the capacitor 14. Thereby, electric power is supplied to the capacitor 14 from the unit battery E (n−1) and the unit battery E (n−2).

  On the other hand, in addition to the first switching element SA (n−2) and the first switching element SAn selected for the equalization operation, the connection control unit 19a includes the first switching element SA1, the first switching element SA2, Electric power is supplied from the assembled battery 10 to the three-phase motor 17 by performing opening / closing control of the first opening / closing element SA3 and the first opening / closing element SA (n + 1). Specifically, the control is performed as follows.

  A unit cell E1 is connected between the first end of the first opening / closing element SA1 and the first end of the first opening / closing element SA2. A unit battery E2 is connected between the first end of the first opening / closing element SA2 and the first end of the first opening / closing element SA3. Between the first end of the first opening / closing element SA3 and the first end of the first opening / closing element SA (n-2), (n-5) unit cells E3 to E (n-3) are connected. ing. Two unit cells E (n-2) and E (n-1) are connected between the first end of the first switch element SA (n-2) and the first end of the first switch element SAn. Has been. A unit battery En is connected between the first end of the first opening / closing element SAn and the first end of the first opening / closing element SA (n + 1).

  If the first opening / closing element SA1 and the first opening / closing element SA2 are closed, the unit battery E1 is arranged between the u-phase 17u and the v-phase 17v of the three-phase motor 17. Therefore, the interphase voltage between the u-phase 17u and the v-phase 17v of the three-phase motor 17 is 3 (V). If the first opening / closing element SA1 and the first opening / closing element SAn are closed, unit cells E1 to E (n-1) are arranged between the u-phase 17u and the v-phase 17v of the three-phase motor 17. It becomes. Therefore, the interphase voltage between the u-phase 17u and the v-phase 17v of the three-phase motor 17 is 3 (n-1) (V). If the first opening / closing element SA2 and the first opening / closing element SA (n + 1) are closed, unit cells E2 to En are arranged between the u-phase 17u and the v-phase 17v of the three-phase motor 17. . Therefore, the interphase voltage between the u-phase 17u and the v-phase 17v of the three-phase motor 17 is −3 (n−1) (V). If the first opening / closing element SAn and the first opening / closing element SA (n + 1) are controlled to close, the unit battery En is disposed between the u-phase 17u and the v-phase 17v of the three-phase motor 17. Therefore, the interphase voltage between the u-phase 17u and the v-phase 17v of the three-phase motor 17 is 3 (V).

  If the first opening / closing element SA1 and the first opening / closing element SA3 are controlled to close, the unit battery E1 and the unit battery E2 are disposed between the u-phase 17u and the w-phase 17w of the three-phase motor 17. Therefore, the interphase voltage between the u phase 17u and the w phase 17w of the three-phase motor 17 is 6 (V). If the first opening / closing element SA1 and the first opening / closing element SA (n-2) are closed, the unit cells E1 to E (n-3) are placed between the u-phase 17u and the w-phase 17w of the three-phase motor 17. Will be arranged. Therefore, the interphase voltage between the u-phase 17u and the w-phase 17w of the three-phase motor 17 is 3 (n-2) (V). If the first opening / closing element SA3 and the first opening / closing element SA (n + 1) are closed, unit cells E3 to En are arranged between the u-phase 17u and the w-phase 17w of the three-phase motor 17. . Accordingly, the interphase voltage between the u-phase 17u and the w-phase 17w of the three-phase motor 17 is −3 (n−2) (V). If the first opening / closing element SA (n−2) and the first opening / closing element SAn are controlled to close, the unit cells E (n−2) to En between the u-phase 17u and the w-phase 17w of the three-phase motor 17 Will be arranged. Therefore, the interphase voltage between the u-phase 17u and the w-phase 17w of the three-phase motor 17 is 9 (V).

  If the first opening / closing element SA2 and the first opening / closing element SA3 are closed, the unit battery E2 is disposed between the v-phase 17v and the w-phase 17w of the three-phase motor 17. Accordingly, the interphase voltage between the v-phase 17v and the w-phase 17w of the three-phase motor 17 is 3 (V). If the first opening / closing element SA2 and the first opening / closing element SA (n-2) are controlled to close, the unit cells E2 to E (n-3) are provided between the v phase 17v and the w phase 17w of the three-phase motor 17. Will be arranged. Accordingly, the interphase voltage between the v-phase 17v and the w-phase 17w of the three-phase motor 17 is 3 (n-4) (V). If the first opening / closing element SA3 and the first opening / closing element SAn are controlled to close, the unit cells E3 to E (n-1) are arranged between the v-phase 17v and the w-phase 17w of the three-phase motor 17. It becomes. Therefore, the interphase voltage between the v-phase 17v and the w-phase 17w of the three-phase motor 17 is 3 (n−3) (V). If the first opening / closing element SA (n-2) and the first opening / closing element SAn are controlled to be closed, the unit battery E (n-2) and the unit between the v-phase 17v and the w-phase 17w of the three-phase motor 17 are provided. Battery E (n-1) will be arranged. Therefore, the interphase voltage between the v-phase 17v and the w-phase 17w of the three-phase motor 17 is 6 (V).

  Therefore, the interphase voltage between the u phase 17u and the v phase 17v of the three-phase motor 17, the interphase voltage between the u phase 17u and the w phase 17w of the three phase motor 17, and the v phases 17v and w of the three phase motor 17 The interphase voltage between the phase 17w is different. Therefore, the duty ratio of the first PWM signal for opening / closing control of the first opening / closing element SAh is changed. The three-phase motor 17 is driven by setting the AC voltage applied between the phases of the three-phase motor 17 to a three-phase AC voltage.

  FIG. 3 shows a case where it is determined that the voltage of the unit battery E1 is low, that is, the remaining capacity is low, and power is supplied from the capacitor 14 to the unit battery E1 in the power conversion device according to this embodiment shown in FIG. It is an equivalent circuit.

  The connection control unit 19a selects the first switching element SA1, the first switching element SA2, the second switching element SB4, and the second switching element SB5 for the equalization operation. Then, the first opening / closing element SA1 and the second opening / closing element SB5 are closed to connect the positive electrode of the unit battery E1 to the first end of the capacitor 14. Further, the first opening / closing element SA2 and the second opening / closing element SB4 are closed to connect the negative electrode of the unit battery E1 to the second end of the capacitor 14. Thereby, electric power is supplied from the capacitor 14 to the unit battery E1.

  On the other hand, the connection control means 19a includes the first switching element SA3, the first switching element SA (n-2), the first switching element SA1 and the first switching element SA2 selected in addition to the first switching element SA1 and the first switching element SA2. Electric power is supplied from the assembled battery 10 to the three-phase motor 17 by performing opening / closing control of the one opening / closing element SAn and the first opening / closing element SA (n + 1). Here, since the first opening / closing element SAh selected by the connection control means 19a is the same as that in the case where power is supplied from the assembled battery 10 to the capacitor 14 as described above, it is arranged between the phases of the three-phase motor 17. The unit battery Eh is the same, and the supply of power to the three-phase motor 17 is performed by the same control.

  Note that, in the present embodiment, the case where power is supplied from the assembled battery 10 to the capacitor 14 and the case where power is supplied from the capacitor 14 to the assembled battery 10 are selected for supplying power to the three-phase motor 17. Although one open / close element SAh is the same, it may be different.

  With the above configuration, the power conversion device according to the present embodiment has the following effects.

  The power output from the assembled battery 10 including one or a plurality of unit batteries Eh is input to the bus 12 via the first switching element group 11 and is the same from the first end side and the second end side of the bus 12 respectively. Electric potential power is output. Therefore, by selectively opening and closing the first opening and closing element SAh constituting the first opening and closing element group 11 and selectively opening and closing the second opening and closing element SBi, one or a plurality of unit batteries Eh and the capacitor 14 are connected. You can connect and exchange power. On the other hand, electric power can be supplied to each phase of the three-phase motor 17 by selective opening / closing control of the first opening / closing element SAh. Therefore, it is possible to transfer power between the unit battery Eh and the capacitor 14 while supplying power to the three-phase motor 17, and even when power is not supplied to the three-phase motor 17, the three-phase motor It is possible to transfer power between the assembled battery 10 and the capacitor 14 without going through 17. Therefore, power can be exchanged between the assembled battery 10 and the capacitor 14 regardless of whether the three-phase motor 17 is driven or not.

  -Electric power is consumed by the equalizing operation for equalizing the capacities of the unit batteries Eh constituting the assembled battery 10, and the unit battery Eh generates heat, so that it is possible to suppress a decrease in performance of the assembled battery 10 at low temperatures. it can.

  The connection control means 19a selects the pair of first opening / closing elements SAh and connects the assembled battery 10 to any one of the first bus B1, the second bus B2, and the third bus B3, thereby making the three-phase motor 17 One or a plurality of unit cells Eh can be arranged between the phases. On the other hand, when power is supplied from the assembled battery 10 to the capacitor 14, power is supplied to the capacitor 14 from one or a plurality of continuous unit batteries Eh having a large remaining capacity, and from the capacitor 14 to the assembled battery 10. When supplying electric power, electric power is supplied from the capacitor 14 to one unit battery Eh having a small remaining capacity. Here, since the unit battery Eh having a large remaining capacity and the unit battery Eh having a small remaining capacity change with the consumption of power of the assembled battery 10 and the supply of power to the assembled battery 10, connection control is performed. The first switching element SAh selected by the means 19a changes according to the remaining capacity of each unit battery Eh. Therefore, the voltage between the phases of the three-phase motor 17 is not constant.

  In this embodiment, since the duty ratio of the first PWM signal is changed according to the voltage between the phases of the three-phase motor 17, even if the voltage between the phases of the three-phase motor 17 fluctuates, the alternating current applied to each phase The voltage can be a three-phase AC voltage having a shift of 1/3 period and the same peak value. Therefore, driving of the three-phase motor 17 and power transfer between the assembled battery 10 and the capacitor 14 can be compatible.

  By controlling the time ratio of the first PWM signal and the time ratio of the second PWM signal, the voltage applied to the capacitor 14 can be set to a desired voltage. Therefore, by providing output terminals 15a and 15b connected in parallel with the capacitor 14, and connecting an electric load such as an in-vehicle device or a storage battery to the output terminals 15a and 15b, a desired voltage is applied to the electric load or the storage battery. Can be input.

Second Embodiment
FIG. 4 is a circuit diagram of the power conversion apparatus according to the present embodiment. The power converter according to the present embodiment is different from the power converter according to the first embodiment in the configuration of the first switching element group 11.

  The first open / close element group 11 includes (n + 1) pairs of first open / close element pairs SAh ′ (h = 1, 2, 3,..., N + 1), and each first open / close element pair SAh ′ The first opening / closing element SAha and the first opening / closing element SAhb are configured.

  The first end of the first opening / closing element SA1a and the first end of the first opening / closing element SA1b are connected to the positive electrode of the unit battery E1, that is, the positive electrode end of the assembled battery 10. The first end of the first switch element SA2a and the first end of the first switch element SA2b are connected between the unit battery E1 and the unit battery E2. Similarly, the first end of the first opening / closing element SAka (2 ≦ k ≦ n) and the first end of the first opening / closing element SAkb are connected between the unit battery Ek and the unit battery E (k + 1). The first end of the opening / closing element SA (n + 1) a and the first end of the first opening / closing element SA (n + 1) b are connected to the negative electrode of the unit battery En, that is, the negative electrode end of the assembled battery 10.

  The second end of the first opening / closing element SA1a is connected to the first bus B1, and the second end of the first opening / closing element SA1b is connected to the second bus B2. Hereinafter, similarly, the first bus B1, the second end of the first opening / closing element SAha and the second end of the first opening / closing element SAhb constituting the first opening / closing element pair SAh ′ are connected to each other in a different manner. It is connected to either the 2 bus B2 or the third bus B3.

  With the above configuration, the power conversion device according to the present embodiment has the same effects as the power conversion device according to the first embodiment. In addition, the power converter according to the present embodiment is connected to the capacitor 14 and the output terminals 15a and 15b, although the number of first switching elements SAha and SAhb is increased as compared with the power converter according to the first embodiment. The combination pattern of the unit cells Eh to be increased can be further increased.

<Third Embodiment>
FIG. 5 is a circuit diagram of the power conversion apparatus according to the present embodiment. The power converter according to the present embodiment, the power converter according to the first embodiment, and the power converter according to the second embodiment are different in the configuration of the first switching element group 11.

  The first switch element group 11 includes (n + 1) first switch element groups SAh ″ (h = 1, 2, 3,..., N + 1), and the first switch element group SAh ″. Is composed of a first opening / closing element SAha, a first opening / closing element SAhb, and a first opening / closing element SAhc.

  The first end of the first opening / closing element SA1a, the first end of the first opening / closing element SA1b, and the first end of the first opening / closing element SA1c are connected to the positive electrode of the unit battery E1, that is, the positive electrode end of the assembled battery 10. The first end of the first opening / closing element SA2a, the first end of the first opening / closing element SA2b, and the first end of the first opening / closing element SA2c are connected between the unit battery E1 and the unit battery E2. Similarly, the first end of the first opening / closing element SAka (2 ≦ k ≦ n), the first end of the first opening / closing element SAkb, and the first end of the first opening / closing element SAkc are connected to the unit battery Ek and the unit battery E ( k + 1), the first end of the first switch element SA (n + 1) a, the first end of the first switch element SA (n + 1) b, and the first end of the first switch element SA (n + 1) c are The unit battery En is connected to the negative electrode, that is, the negative electrode end of the assembled battery 10.

  The second end of the first switch element SAha is connected to the first bus B1, the second end of the first switch element SAhb is connected to the second bus B2, and the second end of the first switch element SAhc. Are connected to the third bus B3. That is, the unit cells can be selectively connected to any one of the first bus B1, the second bus B2, and the third bus B3 by the first opening / closing element set SAh ″.

  By the said structure, the power converter device which concerns on this embodiment has an effect similar to the power converter device which concerns on 1st Embodiment, and the power converter device which concerns on 2nd Embodiment. Further, the power conversion device according to the present embodiment has a capacitor 14 and an output terminal 15a, although the number of first switching elements SAha, SAhb, SAhc is further increased as compared with the power conversion device according to the second embodiment. The combination pattern of the unit batteries Eh connected to 15b can be further increased.

<Modification>
In the first embodiment, the connection method between the first switching element group 11 and the bus 12 is not limited to the connection method of the first embodiment. In order to be able to connect one unit battery Eh and the capacitor 14, at least the first switching elements SAh at both ends of each unit battery Eh need to be connected to each other, but the other first switching elements SAh May be connected to any electrical wiring. In addition, it is preferable that the connection destinations of the first switching elements SAh at both ends of the four continuous unit cells Eh are different from each other. Various electronic devices mounted on the vehicle are 12V. Therefore, a voltage of 12 V can be output from the four consecutive unit cells Eh by making the connection destinations of the first switching elements SAh at both ends of the four consecutive unit cells Eh different from each other.

  -In each above-mentioned embodiment, although the power converter device shall be mounted in a vehicle, you may mount in things other than a vehicle. Even when mounted on a vehicle, power may be supplied to a motor other than the motor that supplies driving force to the driving wheels.

  -In the said 2nd Embodiment, the connection pattern of the 2nd end of 1st switch element SAha and SAhb which comprises a pair of 1st switch element pair SAh 'provided between each unit battery is a connection of the said 2nd Embodiment. It is not limited to the method.

  In each of the above embodiments, the first open / close element SAh, SAha, SAhb, SAhc, the second open / close element SBi, and the third open / close element SCj are connected in series in opposite directions to each other. It may be used.

  In the above embodiments, the three-phase AC power supplied to the three-phase motor 17 is generated. However, a multi-phase AC voltage supplied to a multi-phase motor other than the three-phase motor may be generated.

  DESCRIPTION OF SYMBOLS 10 ... Battery assembly, 12 ... Bus, 14 ... Capacitor, 17 ... Three-phase motor, B1 ... First bus, B2 ... Second bus, B3 ... Third bus, Eh ... Unit battery, SAh ... First switch element, SBi ... second switching element.

Claims (7)

An assembled battery (10) as a serially connected unit battery (Eh) which is one or a plurality of adjacent battery cells, a storage means (14) for storing electric energy, and an m (≧ 3) phase motor (17) A power conversion device for transferring power between the assembled battery and the power storage means and supplying power from the assembled battery to the m-phase motor,
A bus (12) composed of the m rows of electrical wirings (B1, B2, B3);
A plurality of first opening / closing means (SAh) for opening and closing a path connecting the adjacent unit batteries and both ends of the assembled battery to any one of the electrical wirings of the bus in both directions;
A second opening / closing means (SBi) provided on the first end side of the bus and configured to open and close a path connecting the positive electrode and the negative electrode of the power storage means to any one of the electrical wirings of the bus; Prepared,
The electric power converter according to claim 1, wherein each electric wiring of the bus is connected to a different phase of the m-phase motor on a second end side opposite to the first end side of the bus.   A plurality of third opening / closing means (SCj) for opening and closing a path connecting each electrical wiring and each phase of the m-phase motor on the second end side of the bus. The power conversion device according to claim 1.   By selecting and opening and closing the first opening and closing means and the second opening and closing means, one or a plurality of the unit batteries and the power storage means are connected, and by opening and closing the third opening and closing means, The power converter according to claim 2, further comprising connection control means (19a) for connecting each electric wiring and each phase of the m-phase motor. An opening / closing control means (19b) for outputting a first PWM signal for controlling opening / closing of the first opening / closing means;
The connection control means selects a pair of the first opening / closing means for each of the electric wirings, and connects the unit cell and the electric wiring by one of the selected pair of the first opening / closing means. Connect
4. The power conversion according to claim 3, wherein the open / close control unit generates a multi-phase AC voltage by changing a time ratio of the first PWM signal according to a voltage applied between phases of the m-phase motor. apparatus. The opening / closing control means further outputs a second PWM signal for controlling opening / closing of the second opening / closing means,
The time ratio of the second PWM signal is changed so that a DC voltage is input to the power storage unit according to the voltage applied between the phases of the m-phase motor and the time ratio of the first PWM signal. The power conversion device according to claim 4. Further comprising output terminals (15a, 15b) connected in parallel with the power storage means,
The said open / close control means controls the DC voltage output from the output terminal by changing the time ratio of the first PWM signal and the time ratio of the second PWM signal. Power conversion device.   The power conversion apparatus according to claim 1, wherein m is three.

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