JP5629667B2 - Multi-phase converter - Google Patents

Description

  The present invention relates to a multiphase converter, for example, a vehicle-mounted multiphase converter that is particularly useful when an in-vehicle battery is used as a power source.

  In general, a power drive vehicle such as a hybrid vehicle or an electric vehicle includes a battery for supplying drive power to a motor, and a boost converter for boosting the battery voltage and outputting the boosted voltage to a motor drive circuit. I have. This boost converter has an inductor that generates an induced electromotive force by switching current, a switching circuit for performing the switching, etc., and outputs a boosted voltage obtained by adding the induced electromotive force to the input voltage to the motor drive circuit. To do. That is, the boost converter can output a voltage higher than the battery voltage to the motor drive circuit.

  In recent years, vehicle-mounted charging devices have been developed in which electric power is supplied from an outlet of a commercial power supply or other external power supply device to charge the on-vehicle battery. Proposes a multi-phase converter for mounting on a vehicle that can reduce the scale of the apparatus.

  As shown in FIG. 5, this on-vehicle multiphase converter is provided between the on-vehicle power source 100 and the load 200, and includes power modules 111, 112, 113, inductors L11, L12, four relay switches SW11, SW12, SW13, SW14, external power plug 70, and smoothing capacitor 4 are provided. In such a configuration, by turning off the relay switches SW11, SW12, SW13, and SW14, the output voltage from the vehicle-mounted power supply 100 is boosted by the power module 113, and then the inductors are operated by the single-phase inverter operation by the power modules 111 and 112. Power is supplied to a commercial AC power supply (not shown) via L11, L12 and the external power plug 70.

JP 2010-220443 A

  In the meantime, in contrast to charging and recharging the vehicle battery from a commercial power source, in an emergency or emergency where power transmission to the commercial power source is stopped, the vehicle battery is It can be suitably used as a power source for supplying power to various devices and devices.

  However, while the output voltage of a normal household power supply is AC100V, the voltage of the in-vehicle battery is often higher than that, for example, about 200V. When the multi-phase converter (FIG. 5) as described in Patent Document 1 is applied to this in-vehicle battery, the power supply voltage can only be boosted due to the characteristics of the voltage conversion circuit provided therein. A voltage lower than the voltage (100 V or the like) cannot be output, and as such is not suitable as an emergency or emergency power source for general household use. In this case, in order to output AC 100 V, it is necessary to additionally provide another voltage conversion means that can step down the voltage other than the multi-phase converter.

  Therefore, the present invention has been made in view of such circumstances, and it is possible to charge a vehicle-mounted power source such as a vehicle-mounted battery, and output from the vehicle-mounted power source without using other voltage conversion means. It is an object of the present invention to provide a multi-phase converter that can output not only a voltage but also a voltage that is stepped down.

  In order to solve the above problems, a multi-phase converter according to the present invention is connected to a vehicle-mounted power source mounted on a vehicle and has at least one first inductor connected to one pole of the vehicle-mounted power source. A vehicle-mounted power source, comprising: a first power module; and at least two second power modules connected to the vehicle-mounted power source and having a second inductor connected to one pole of the vehicle-mounted power source. On the first line connecting the at least two second power modules, an open / close switch for connecting or disconnecting each second inductor and one pole of the vehicle-mounted power source is provided, and mounted on the vehicle The second line connecting the power source and the at least two second power modules has at least two second power modules and a vehicle-mounted power source. And a selector switch for switching the connection between the one pole and the other pole. As a normal operation mode for outputting electric power for driving the vehicle from the vehicle-mounted power source, the open / close switch is closed, and the selector switch is set to at least two switches. An open / close switch as an external charge / discharge mode in which the second power module is switched so as to be connected to the other pole of the vehicle-mounted power source, and the vehicle-mounted power source is charged from the outside or power is output from the vehicle-mounted power source to the outside And a control unit that switches the changeover switch so that at least two second power modules are connected to one pole of the on-vehicle power source, and an external power source or a switch between the second inductor and the open / close switch. An external load is configured to be connected.

  In such a configuration, the electric power after boosting the output voltage of the on-vehicle power supply is driven in the vehicle drive in the normal operation mode by the control of the open / close switch and the changeover switch by the control unit and the switching control of each power module. It is output from the multiphase converter as power for operation. In the external charge / discharge mode, the circuit portion including at least the first power module and the circuit portion including at least two power modules are cut off and separated. Accordingly, at least a circuit portion including the first power module functions as a converter having a function of adjusting (boosting / boosting) a voltage input / output thereto by operating in a flyback mode, for example. In addition, the circuit portion including at least two second power modules functions as an inverter that performs AC / DC conversion, for example, and an external power source or an external load is connected to the inverter side, so that the on-vehicle power source is supplied by the external power source. Is charged, or electric power obtained by stepping up / down the output voltage from the on-vehicle power source is output to the outside.

  More specifically, each of the at least one first power module and the at least two second power modules has two switching elements, and the first inductor has each first power module. Between the two switching elements of the module and between one pole of the vehicle-mounted power supply, a second inductor is provided between the two switching elements of each second power module and one of the vehicle-mounted power supplies. There is a configuration in which the changeover switch is provided between the at least one first power module and between the at least two second power modules and the on-vehicle power source. It is done.

  It is also preferable to provide three second power modules and to output a three-phase AC voltage in the external charge / discharge mode. In this way, there is an advantage that it is easy to achieve system linkage with an external load (device, device, etc.) installed outside the home, for example, driven by three-phase AC power.

  Furthermore, it is useful to provide at least two first power modules. If it does in this way, the output of a voltage conversion circuit can be increased according to the number of systems of the 1st power module.

  In addition, the control unit appropriately selects a power module to be used and a power module not to be used from among at least one first power module and at least two second power modules, and controls the switching element. Even so, it is useful. That is, the number of systems (number of arms) of the first power module and the second power module is not particularly limited as long as it is 1 or more and 2 or more, respectively. Alternatively, it is not necessary to use all the switching elements (arms) included in those power modules. For example, in the external charge / discharge mode, the output balance between the converter and the inverter is considered and / or the external load is used. A power module to be used and a power module not to be used may be determined in consideration of a required voltage or the like.

  According to the present invention, the vehicle-mounted power source, the first and second power modules, the open / close switch, the change-over switch, and the control unit that controls them are provided as circuit components of the multiphase converter, and the normal operation mode and Since the operation in the external charge / discharge mode is performed, the on-vehicle power source can be charged, and the output voltage from the on-vehicle power source can be reduced as well as boosted without using other voltage conversion means. It becomes possible to output. As a result, the vehicle-mounted power source can be effectively used as an alternative external power source for commercial power sources in an emergency or emergency.

1 is a system configuration diagram showing a preferred embodiment of a multiphase converter according to the present invention, and is a diagram showing a state in which the multiphase converter is operating in a normal operation mode. FIG. 2 is a system configuration diagram showing a state in which the multiphase converter shown in FIG. 1 is operated in an external charge / discharge mode. FIG. 3 is a circuit development view of the system configuration diagram shown in FIG. 2. FIG. 6 is a system configuration diagram showing another preferred embodiment (with a soft switching function attached) of the multiphase converter according to the present invention. It is a system block diagram which shows an example of the conventional multiphase converter.

  Hereinafter, embodiments of the present invention will be described in detail. The positional relationship such as up, down, left, and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios. Furthermore, the following embodiment is an illustration for explaining the present invention, and is not intended to limit the present invention only to the embodiment. Furthermore, the present invention can be variously modified without departing from the gist thereof.

  FIG. 1 is a system configuration diagram showing a preferred embodiment of a multiphase converter according to the present invention, and is a diagram showing a state in which the multiphase converter is operated in a normal operation mode described later. The three-phase multiphase converter 1 boosts a voltage output from a vehicle-mounted power source 100 such as a secondary battery or a fuel cell installed in the vehicle, and drives a drive motor, a drive inverter, a generator motor, an auxiliary motor, and the like. The boosted power is supplied to a load 200 such as a machine (normal operation mode). Further, the vehicle-mounted power source 100 is charged by acquiring power from an external power source such as a commercial power source, and the voltage output from the vehicle-mounted power source 100 is appropriately used in the event of an emergency such as a commercial power source. It also functions as a converter that steps up or down the voltage and supplies (discharges) the electric power to devices and devices outside the vehicle (external charge / discharge mode).

  This three-phase multiphase converter 1 is equipped with a U-phase power module 11, a V-phase power module 12, and a W-phase power module 13. Each of these power modules 11, 12, and 13 includes an inductor L1 (first inductor) and switching elements S1 and S2, an inductor L2 (second inductor) and switching elements S3 and S4, and an inductor L3 (first inductor). 2 inductors) and switching elements S5 and S6.

  The switching element S1 is formed by connecting a diode 31 to a semiconductor device 21 such as an insulated gate bipolar transistor (IGBT), another bipolar transistor, or a field effect transistor (FET) as shown in the figure. That is, the diode 31 is connected between the collector terminal and the emitter terminal of the semiconductor device 21 so that the emitter terminal side becomes the anode terminal. In this case, the current flowing from the emitter terminal to the collector terminal of the semiconductor device 21 flows through the diode 31 when the diode 31 is forward biased. Similarly, the switching elements S2 to S6 are obtained by connecting diodes 32 to 36 to the semiconductor devices 22 to 26, respectively.

  One end of the inductor L1 is connected to the connection node C1 of the switching elements S1 and S2 of the U-phase power module 11, and the other end of the inductor L1 is connected to the positive electrode (one pole) of the vehicle-mounted power source 100. In addition, one end of inductors L2 and L3 is connected to connection node C2 of switching elements S3 and S4 of V-phase power module 12 and connection node C3 of switching elements S5 and S6 of W-phase power module 13, respectively. Yes. The other ends of the inductors L2 and L3 are connected to the positive electrode (one electrode) of the on-vehicle power supply 100 via relay switches SW2 and SW3 (both open / close switches).

  Further, one pole and the other pole of the single-phase power plug 7 are connected between the inductor L2 and the relay switch SW2 and between the inductor L3 and the relay switch SW3. An external power supply or an external load is connected to the single-phase power plug 7 (in the figure, the single-phase power plug 7 is shown in a male shape, but the form of the input / output portion is Not limited.)

  Thus, the U-phase power module 11 corresponds to “at least one first power module”, and the V-phase power module 12 and the W-phase power module 13 correspond to “at least two second power modules”. The relay switches SW2 and SW3, which are “open / close switches”, are provided on lines 61 and 61 (first line) connecting the vehicle-mounted power source 100 and the V-phase power module 12 and the W-phase power module 13, respectively. The inductors L2 and L3 and the positive electrode of the on-vehicle power source 100 are connected or disconnected.

  The upper ends of the switching elements S1, S3, and S5 (the ends opposite to the connection nodes C1, C2, and C3 with the switching elements S2, S4, and S6) are commonly connected to one end of the smoothing capacitor 4. . Further, a relay switch SW1 (switching switch) is provided between the illustrated lower ends of the switching elements S2 and S4 (ends opposite to the connection nodes C1 and C2 with the switching elements S1 and S3). The relay switch SW1 operates so as to switch between the contact 52 on the switching element S2 side and the contact 53 connected to the positive electrode of the on-vehicle power supply 100 with the contact 51 on the switching element S4 side as a base point.

  When the relay switch SW1 is connected to the contacts 51 and 52 (the state shown in FIG. 1; this state is hereinafter referred to as “on”), the lower ends of the switching elements S2, S4 and S6 (the switching elements S1, S3 and S3). The end of the connection node C1, C2, and C3 opposite to S5 is commonly connected to the other end of the smoothing capacitor 4 and the negative electrode (the other electrode) of the on-vehicle power supply 100. On the other hand, when the relay switch SW1 is connected to the contacts 51 and 53 (the state shown in FIG. 2 to be described later; this state is hereinafter referred to as “off”), the lower end of the switching element S2 is the negative electrode of the on-vehicle power source 100. The lower ends of the switching elements S4 and S6 are connected in common to the other end of the smoothing capacitor 4 and the positive electrode (one electrode) of the on-vehicle power supply 100.

  As described above, the relay switch SW <b> 1 that is a “changeover switch” is provided on the lines 62, 62, 62 (second line) connecting the on-vehicle power supply 100, the V-phase power module 12, and the W-phase power module 13. Therefore, the V-phase power module 12 and the W-phase power module 13 operate to switch the connection between the positive electrode or the negative electrode of the on-vehicle power supply 100.

Further, a controller 8 (control unit) is connected to the switching elements S1 to S6 (semiconductor devices 21 to 26) and the relay switches SW1, SW2, and SW3 (a connection line is omitted in the drawing). The switching elements S1 to S6 and the relay switches SW1, SW2 and SW3 are opened / closed or switched based on a command signal from.
(Normal operation mode)

  In the normal operation mode using the three-phase multiphase converter 1 configured as described above, the relay switches SW1, SW2, and SW3 are turned on based on a command from the controller 8 as shown in FIG. In this mode, control is performed such that a voltage obtained by boosting the output voltage of the vehicle-mounted power supply 100 is output as an output voltage of the three-phase multiphase converter 1 to a load 200 such as a drive motor of the vehicle.

  When switching elements S1, S3, and S5 are turned off and switching elements S2, S4, and S6 are turned on among switching elements S1 to S6, the positive electrode of vehicle-mounted power supply 100 is connected via inductors L1, L2, and L3 connected thereto. Current flows through the switching elements S2, S4, S6 in the on state. Then, when switching elements S2, S4, and S6 are turned off, induced electromotive forces are generated in inductors L1, L2, and L3. At this time, diodes 31, 33, and 35 of switching elements S1, S3, and S5 are turned on, A voltage obtained by adding the induced electromotive force to the output voltage of the on-vehicle power supply 100 is applied to both ends of the smoothing capacitor 4 and the load 200 connected to the end of the smoothing capacitor 4.

  At this time, when the voltage obtained by adding the induced electromotive force to the output voltage of the on-vehicle power supply 100 is equal to or higher than the voltage across the terminals of the smoothing capacitor 4, the charging voltage of the smoothing capacitor 4 is maintained or the smoothing capacitor 4 is Charged. With this operation, a voltage larger than the output voltage of the on-vehicle power supply 100 is supplied to the load 200 side. In this respect, the smoothing capacitor 4 functions as an output capacitor.

  Further, when the voltage obtained by adding the induced electromotive force to the output voltage of the on-vehicle power supply 100 is smaller than the voltage between the terminals of the smoothing capacitor 4, the smoothing capacitor 4 causes the on-state switching elements S1, S3, S5, and A current can flow to the on-vehicle power source 100 via the inductors L1, L2, and L3 connected to them. In this case, if the on-vehicle power supply 100 is configured to be rechargeable, it is charged.

Based on the above principle, the controller 8 applies to the smoothing capacitor 4 a voltage obtained by adding the inductor induced electromotive force to the output voltage of the vehicle-mounted power supply 100, and the voltage across the terminals of the smoothing capacitor 4 depends on the vehicle running control. The switching elements S1 to S6 are controlled to output DC power so that the voltage becomes a high voltage and is supplied to the load 200 side. The induced electromotive force generated in the inductors L1, L2, and L3 can be adjusted as desired by appropriately changing their switching timing and duty.
(External charge / discharge mode)

  FIG. 2 is a system configuration diagram showing a state where the multiphase converter shown in FIG. 1 is operated in the external charge / discharge mode, and FIG. 3 is a circuit development view thereof. In the external charge / discharge mode using the three-phase multi-phase converter 1, the relay switches SW1, SW2, and SW3 are turned off as shown in FIG. In this mode, the following four operation modes can be realized. At that time, the circuit portion including the U-phase power module 11 functions as the converter 300 for voltage adjustment (buck-boost), and the V-phase power A circuit portion including the module 12 and the W-phase power module 13 functions as the inverter 400 (see FIG. 3).

(1) Step-down / discharge mode In this mode, the output voltage from the vehicle-mounted power source 100 is stepped down, and AC power having a voltage lower than the output voltage from the vehicle-mounted power source 100 is supplied to the outside. This is effective, for example, when driving a load (such as a home appliance) connected to the single-phase power plug 7 and driven at a voltage lower than 100V when the on-vehicle power supply 100 voltage is 200V. is there. In this case, the controller 8 operates the U-phase power module 11 by flyback control (flyback mode) and appropriately controls the switching operation of the switching elements S1 and S2, thereby adjusting the duty as appropriate, for example. The voltage output from the mounted power supply 100 is stepped down, and the smoothing capacitor 4 is charged. Then, under the control of the controller 8, the V-phase power module 12 and the W-phase power module 13 are operated using the charged smoothing capacitor 4 as a power source, and AC power is output to the single-phase power plug 7.

(2) Boost / Discharge Mode In this mode, the output voltage from the vehicle-mounted power source 100 is boosted, and AC power having a voltage higher than the output voltage from the vehicle-mounted power source 100 is supplied to the outside. This is effective, for example, when driving a load (industrial equipment or the like) that is driven at a voltage of 200 V or higher connected to the single-phase power plug 7 when the on-vehicle power supply 100 voltage is less than 200 V. . In this case, the controller 8 operates the U-phase power module 11 by flyback control (flyback mode) and appropriately controls the switching operation of the switching elements S1 and S2, thereby adjusting the duty as appropriate, for example. The voltage output from the mounted power supply 100 is boosted, and the smoothing capacitor 4 is charged. Then, under the control of the controller 8, the V-phase power module 12 and the W-phase power module 13 are operated using the charged smoothing capacitor 4 as a power source, and AC power is output to the single-phase power plug 7.

(3) Step-down / charging mode In this mode, an external power source is connected to the single-phase power plug 7, and from there, AC power higher than the voltage of the on-vehicle power source 100 is input to the three-phase multi-phase converter 1, and the voltage The vehicle-mounted power supply 100 is charged by lowering the voltage. In this case, the controller 8 DC-converts the AC input supplied from the external power supply by the V-phase power module 12 and the W-phase power module 13 and charges the smoothing capacitor 4. Then, by operating the U-phase power module 11 by flyback control (flyback mode) and appropriately controlling the switching operation of the switching elements S1 and S2, for example, the duty is appropriately adjusted, and the output from the smoothing capacitor 4 is achieved. The voltage is stepped down and the on-vehicle power supply 100 is charged.

(4) Boosting / Charging Mode In this mode, an external power supply is connected to the single-phase power plug 7, and from there, AC power lower than the voltage of the vehicle-mounted power supply 100 is input to the three-phase multiphase converter 1, and the voltage To charge the on-vehicle power supply 100. In this case, the controller 8 DC-converts the AC input supplied from the external power supply by the V-phase power module 12 and the W-phase power module 13 and charges the smoothing capacitor 4. Then, by operating the U-phase power module 11 by flyback control (flyback mode) and appropriately controlling the switching operation of the switching elements S1 and S2, for example, the duty is appropriately adjusted, and the output from the smoothing capacitor 4 is achieved. The voltage is boosted and the on-vehicle power supply 100 is charged.

  According to the three-phase multi-phase converter 1 configured as described above, in the normal operation mode, the output voltage from the vehicle-mounted power source 100 can be boosted and power can be supplied to the load 200 such as a drive motor of the vehicle. . In addition, in the external charge / discharge mode, the on-vehicle power supply 100 is charged by using the power supplied from the external power supply and appropriately raising or lowering the voltage (that is, regardless of the magnitude of the voltage of the external power supply). In addition, the output voltage from the vehicle-mounted power source 100 is used, and the voltage is increased or decreased as appropriate (that is, regardless of the voltage level of the vehicle-mounted power source 100), so that an external load (device, apparatus, etc.) ) Can be operated by supplying power. Therefore, it is possible to operate various external loads by raising and lowering the output voltage from the on-vehicle power supply 100 to a desired voltage without using any extra voltage conversion means other than the three-phase multiphase converter 1. Become. Thereby, it can be effectively used as an independent power source in the event of an emergency or emergency in which a commercial power source or an external power source is lost.

  In addition, as above-mentioned, this invention is not limited to said embodiment, A various deformation | transformation is possible in the limit which does not change the summary. For example, an appropriate capacitor may be provided between the on-vehicle power source 100 and, for example, the inductors L1, L2, and L3 in order to further reduce the ripple component included in the output voltage of the on-vehicle power source 100 by charging and discharging. In addition, an appropriate open / close switch may be provided on both extreme sides of the smoothing capacitor 4. In the normal operation mode, an appropriate open / close switch is installed in front of the electrode so that no voltage is generated between the electrodes of the single-phase power plug 7. May be.

  Further, the number of power modules may be larger than that shown in the figure, and each power module constituting a part of converter 300 and inverter 400 may be added in the external charge / discharge mode. For example, in addition to the V-phase power module 12 and the W-phase power module 13, if one additional power module is additionally provided to configure the inverter 400, a three-phase AC voltage can be output in the external charge / discharge mode. Thus, for example, it is easy to achieve system linkage with an external load (device, apparatus, etc.) installed outside the home that is driven by three-phase AC power. In this case, an appropriate power plug may be installed instead of or in addition to the single-phase power plug 7, and if one system is not used among the three power modules in the inverter 400, FIG. Operation is possible in the same manner as shown in FIG.

  Further, if one or more power modules are additionally provided in addition to the U-phase power module 11 to configure the converter 300, the output from the converter 300 is the number of power module systems even if the output of the on-vehicle power supply 100 is the same. Can be increased depending on

  Thus, although the number of power modules constituting the converter 300 and the inverter 400 is not limited, from the viewpoint of optimizing the power efficiency and the like, the controller 8 appropriately selects a system to be used and selects the converter 300 and the inverter 400. It is preferable that the control is performed so as to balance the output balance. Furthermore, the vehicle on which the three-phase multi-phase converter 1 is mounted is a concept including all the moving means on which the three-phase multi-phase converter 1 is mounted. In addition to hybrid vehicles, electric vehicles, etc., other than these, for example, , Motorcycles, three-wheeled vehicles, ships, railway vehicles, and the like.

  It is also useful to add a soft switching function to the U-phase power module 11 (first power module). As a configuration in this case, for example, as shown in FIG. 4, a configuration in which a soft switching circuit 9 is provided between the switching element S <b> 1 and the vehicle-mounted power source 100 can be cited. This soft switching circuit 9 has a capacitor 81 and a diode 82 connected in series straddling both ends of the switching element S1, an inductor L4 is provided between the inductor L1 and the on-vehicle power source 100, and between the connection nodes C4 and C5. In addition, a diode 83 straddling the relay switch SW4 and a diode 84 connected to one end of the relay switch SW4 are connected in series.

  As described above, the present invention can be widely and effectively used for multi-phase converters, general vehicles including the same, devices including them, systems, facilities, and the like, and their production.

  DESCRIPTION OF SYMBOLS 1 ... Three-phase multiphase converter 1 (multiphase converter), 4 ... Smoothing capacitor, 7 ... Single phase power plug, 8 ... Controller (control part), 9 ... Soft switching circuit, 11 ... U-phase power module (1st Power module), 12 ... V-phase power module (second power module), 13 ... W-phase power module (second power module), 21, 22, 23, 24, 25, 26 ... Semiconductor devices 31, 32 , 33, 34, 35, 36 ... diode, 51, 52, 53 ... contact, 61 ... line (first line), 62 ... line (second line), 81 ... capacitor, 82, 83, 84 ... diode 100 ... Vehicle power supply, 200 ... Load, 300 ... Converter, 400 ... Inverter, C1, C2, C3, C4, C5 ... Connection node, L1 ... A Dactor (first inductor), L2, L3 ... Inductor (second inductor), L4 ... Inductor, S1, S2, S3, S4, S5, S6 ... Switching element, SW1 ... Relay switch (switch), SW2, SW3 ... relay switch (open / close switch), SW4 ... relay switch, 111, 112, 113 ... power module, L11, L12 ... inductor, SW11, SW12, SW13, SW14 ... relay switch, 70 ... external power plug.

Claims (5)

At least one first power module connected to a vehicle-mounted power source mounted on the vehicle and having a first inductor connected to one pole of the vehicle-mounted power source;
At least two second power modules connected to the vehicle-mounted power source and having a second inductor connected to one pole of the vehicle-mounted power source;
With
The first line connecting the vehicle power supply and the at least two second power modules is provided with an open / close switch for connecting or blocking each second inductor and one pole of the vehicle power supply. And the second line connecting the on-vehicle power source and the at least two second power modules has one or the other pole of the at least two second power modules and the on-vehicle power source. And a selector switch for switching the connection with
As a normal operation mode for outputting electric power for driving the vehicle from the vehicle-mounted power source, the open / close switch is closed, the changeover switch is connected to the at least two second power modules at the other electrode of the vehicle-mounted power source. As an external charge / discharge mode in which the vehicle-mounted power supply is charged from the outside or power is output from the vehicle-mounted power supply to the outside, the open / close switch is opened, and the changeover switch is A control unit that switches so that two second power modules are connected to one pole of the on-vehicle power source;
An external power supply or an external load is connected between the second inductor and the open / close switch.
Multi-phase converter. The at least one first power module and the at least two second power modules each have two switching elements;
The first inductor is provided between the two switching elements of the first power modules and between one pole of the vehicle-mounted power source,
The second inductor is provided between the two switching elements of each of the second power modules and between one pole of the vehicle-mounted power source,
The changeover switch is provided between the at least one first power module and between the at least two second power modules and the on-vehicle power source.
The multiphase converter according to claim 1. Three second power modules are provided, and the external charge / discharge mode is configured to output a three-phase AC voltage.
The multi-phase converter according to claim 1 or 2. Comprising at least two of the first power modules;
The multiphase converter according to any one of claims 1 to 3. The control unit appropriately selects a power module to be used and a power module not to be used among the at least one first power module and the at least two second power modules, and controls the switching element. ,
The multi-phase converter according to claim 1.

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