JP2024065970A - Power conversion device and program - Google Patents

Abstract

[Problem] To provide a new power conversion device and a program including a common mode filter. [Solution] A power conversion device 10 has multiple phase AC terminals Tac1 to Tac3, DC terminals TdcH, TdcL, and converts AC power input from the AC terminals Tac1 to Tac3 into DC power and outputs it from the DC terminals TdcH, TdcL. The power conversion device 10 includes first to third paths 41 to 43, first to third inductors 31 to 33 provided in the first to third paths 41 to 43, and a common mode filter 35. The common mode filter 35 includes first to fourth coils 36A to 36D. The first to third coils 36A to 36C are provided in the first to third paths 41 to 43. The fourth coil 36D is connected in parallel to the third coil 36C. [Selected Figure] Figure 1

Description

The present invention relates to a power conversion device and a program.

Conventionally, a power conversion device is known that includes multiple phase AC terminals, DC terminals, and an AC/DC conversion circuit. The AC/DC conversion circuit has at least one of the following functions: converting AC power input from the AC terminal into DC power and outputting it from the DC terminal, and converting DC power input from the DC terminal into AC power and outputting it from the AC terminal. As an example of such a power conversion device, a power conversion device that is compatible with both a three-phase AC power source and a single-phase AC power source is known, as described in Patent Document 1.

JP 2022-503713 A

To meet the requirements of EMC standards for power conversion equipment, the power conversion equipment may be equipped with a common mode filter.

The main objective of the present invention is to provide a new power conversion device and program that includes a common mode filter.

A first aspect of the present invention is a multiple-phase AC terminal;
A DC terminal;
an AC-DC conversion circuit having at least one of a function of converting AC power inputted from the AC terminal into DC power and outputting the DC power from the DC terminal, and a function of converting DC power inputted from the DC terminal into AC power and outputting the AC power from the AC terminal;
In a power conversion device comprising:
an electrical path provided for each phase, connecting the AC/DC conversion circuit and the AC terminal;
A common mode filter;
Equipped with
The common mode filter includes:
A coil provided in the electrical path of each phase;
A specific coil connected in parallel to at least one of the coils;
a core around which each of the coils and the specific coil are wound;
has.

According to the first invention, when a current flows through each electrical path, the current flowing through the specific coil can be distributed between the coil connected in parallel to the specific coil and the specific coil. By connecting the specific coil in parallel to the target coil, which has a relatively larger current flowing through it than the other coils, the current flowing through the target coil can be reduced. As a result, the rated current of the target coil can be reduced. In this way, according to the first invention, a new power conversion device equipped with a common mode filter can be provided.

The first invention can be embodied as, for example, a second invention as follows. In the second invention, a first AC terminal, a second AC terminal, and a third AC terminal are provided as the AC terminals,
The DC terminals include a high potential side DC terminal and a low potential side DC terminal,
a three-phase AC power supply is connectable to the first AC terminal, the second AC terminal, and the third AC terminal, and a single-phase AC power supply is connectable to the first AC terminal and the third AC terminal,
The AC/DC conversion circuit includes:
a series connection of a first upper arm switch and a first lower arm switch;
a series connection of a second upper arm switch and a second lower arm switch;
a third upper arm switch and a third lower arm switch connected in series;
having
The electrical path includes:
a first path electrically connecting a connection point between the first upper arm switch and the first lower arm switch and the first AC terminal;
a second path electrically connecting a connection point between the second upper arm switch and the second lower arm switch and the second AC terminal;
a third path electrically connecting a connection point between the third upper arm switch and the third lower arm switch and the third AC terminal;
is provided,
a first inductor provided in the first path;
a second inductor provided in the second path;
a third inductor provided in the third path;
a single-phase charging switch that electrically connects the first AC terminal and the second AC terminal;
The control unit;
Equipped with
high potential side terminals of the first, second and third upper arm switches are electrically connected to the high potential side DC terminal,
low potential side terminals of the first, second and third lower arm switches are electrically connected to the low potential side DC terminal,
when it is determined that the single-phase AC power supply is connected to the first AC terminal and the third AC terminal, the control unit performs switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch in a state in which the single-phase charging switch is turned on, so as to perform power conversion between the first AC terminal and the third AC terminal and the high potential side DC terminal and the low potential side DC terminal;
The coil constituting the common mode filter is
a first coil provided in the first path closer to the first AC terminal than the first inductor;
a second coil provided in the second path closer to the second AC terminal than the second inductor;
a third coil provided in the third path closer to the third AC terminal than the third inductor;
is provided,
The specific coil is connected in parallel to the third coil.

In the second invention, the control unit controls the switching of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch to perform power conversion between the first and third AC terminals and the high-potential side DC terminal and the low-potential side DC terminal when the single-phase charging switch is on. Because the single-phase charging switch is on, all of the first to third paths can be used as power transmission paths during power conversion using a single-phase AC power source. This makes it possible to increase the transmitted power during power conversion.

In this case, the current flowing through the third path is greater than the current flowing through the first and second paths. Therefore, in the second invention, a specific coil constituting the common mode filter is connected in parallel to a third coil provided in the third path. This makes it possible to reduce the current flowing through the third coil, and therefore the rated current of the third coil.

1 is an overall configuration diagram of an on-board charger according to a first embodiment; FIG. 2 is a plan view of a common mode filter. FIG. 2 is a diagram showing an on-board charger connected to a three-phase AC power supply. FIG. 2 is a diagram showing an on-board charger connected to a single-phase AC power supply. 4 is a flowchart showing a procedure for controlling charging of a storage battery. FIG. 4 is a block diagram of a three-phase charging control process. FIG. 1 is a block diagram of a single-phase charging control process. FIG. 13 is a diagram showing an on-board charger connected to a single-phase AC power supply according to a comparative example. FIG. 11 is an overall configuration diagram of an on-board charger according to a second embodiment. 4 is a flowchart showing a procedure for controlling charging of a storage battery. FIG. 2 is a diagram showing an on-board charger connected to a three-phase AC power supply. FIG. 2 is a diagram showing an on-board charger connected to a single-phase AC power supply. FIG. 11 is an overall configuration diagram of an on-board charger according to a third embodiment. 4 is a flowchart showing a procedure for controlling charging of a storage battery. FIG. 2 is a diagram showing an on-board charger connected to a three-phase AC power supply. FIG. 2 is a diagram showing an on-board charger connected to a single-phase AC power supply. FIG. 13 is a diagram showing a power conversion device according to another embodiment. FIG. 13 is a diagram showing a power conversion device according to another embodiment.

Several embodiments will be described with reference to the drawings. In several embodiments, functionally and/or structurally corresponding and/or associated parts may be given the same reference numerals or reference numerals that differ in the hundredth or higher digit. For corresponding and/or associated parts, the descriptions of other embodiments may be referred to.

First Embodiment
A first embodiment of a power conversion device according to the present invention will be described below with reference to the drawings. The power conversion device according to this embodiment is provided in a vehicle such as an electric vehicle, and specifically, is an AC-DC-DC converter constituting an on-board charger. The on-board charger is also called an on-board charger.

The power conversion device has an AC terminal and a DC terminal. The power conversion device has a function of converting AC power input via the AC terminal connected to an AC power source outside the vehicle into DC power and outputting it from the DC terminal. The DC power output from the DC terminal is supplied to a storage battery provided in the vehicle. The power conversion device also has a function of converting DC power input from the DC terminal into AC power and outputting it from the AC terminal. The AC power output from the AC terminal is supplied to an external power system via the external AC power source. The power conversion device can be connected to a three-phase AC power source or a single-phase AC power source.

As shown in FIG. 1, the power conversion device 10 has a first AC terminal Tac1, a second AC terminal Tac2, and a third AC terminal Tac3 as AC terminals. As shown in FIG. 3, the first to third AC terminals Tac1 to Tac3 can be connected to an external three-phase AC power source 21. As shown in FIG. 4, the first and third AC terminals Tac1 and Tac3 of the first to third AC terminals Tac1 to Tac3 can be connected to an external single-phase AC power source 22.

The power conversion device 10 has a high-potential side DC terminal TdcH and a low-potential side DC terminal TdcL as DC terminals. The high-potential side DC terminal TdcH and the low-potential side DC terminal TdcL are connected to the input section of a DC-DC converter 24 constituting an on-board charger. The output section of the DC-DC converter 24 is connected to a chargeable and dischargeable storage battery 20 mounted on the vehicle. The DC-DC converter 24 transforms the DC voltage input from the high-potential side DC terminal TdcH and the low-potential side DC terminal TdcL, and supplies the transformed DC voltage to the storage battery 20. The DC-DC converter 24 also transforms the DC voltage input from the storage battery 20 and supplies it to the high-potential side DC terminal TdcH and the low-potential side DC terminal TdcL. The DC-DC converter 24 is, for example, an insulated DC-DC converter in which the input section and the output section are electrically insulated, and includes a transformer that connects the input section and the output section.

The power conversion device 10 includes upper and lower arm switches for three phases, which are a series connection of a first upper arm switch S1H and a first lower arm switch S1L, a series connection of a second upper arm switch S2H and a second lower arm switch S2L, and a series connection of a third upper arm switch S3H and a third lower arm switch S3L. In this embodiment, each of the upper and lower arm switches S1H to S3L is an N-channel MOSFET having a body diode. Therefore, in each of the upper and lower arm switches S1H to S3L, the high potential side terminal is the drain, and the low potential side terminal is the source. Of the first to third phases, for example, the first phase is the U phase, the second phase is the V phase, and the third phase is the W phase.

The power conversion device 10 includes a high-potential side path 30H, which is an electrical path connecting the high-potential side terminals of the first, second, and third upper arm switches S1H, S2H, and S3H to the high-potential side DC terminal TdcH, and a low-potential side path 30L, which is an electrical path connecting the low-potential side terminals of the first, second, and third lower arm switches S1L, S2L, and S3L to the low-potential side DC terminal TdcL. The high-potential side path 30H and the low-potential side path 30L are conductive members such as bus bars.

The power conversion device 10 includes a DC side capacitor 34 that connects the high potential side path 30H and the low potential side path 30L. The DC side capacitor 34 functions as a smoothing capacitor and is, for example, an electrolytic capacitor.

The power conversion device 10 includes a first path 41, a second path 42, and a third path 43. The first path 41 is an electrical path that connects the low potential side terminal of the first upper arm switch S1H and the high potential side terminal of the first lower arm switch S1L to the first AC terminal Tac1. The second path 42 is an electrical path that connects the low potential side terminal of the second upper arm switch S2H and the high potential side terminal of the second lower arm switch S2L to the second AC terminal Tac2. The third path 43 is an electrical path that connects the low potential side terminal of the third upper arm switch S3H and the high potential side terminal of the third lower arm switch S3L to the third AC terminal Tac3.

The power conversion device 10 includes a first inductor 31 provided in a first path 41, a second inductor 32 provided in a second path 42, and a third inductor 33 provided in a third path 43. In this embodiment, the inductors 31 to 33 have the same specifications. Therefore, the inductance values of the inductors 31 to 33 are the same. In addition, the rated currents (specifically, the temperature rise rated currents) of the inductors 31 to 33 are the same.

The power conversion device 10 includes a common mode filter 35. The common mode filter 35 includes a first coil 36A, a second coil 36B, a third coil 36C, and a fourth coil 36D as a "specific coil". The first to third coils 36A to 36C are provided on the first to third paths 41 to 43 closer to the first to third AC terminals Tac1 to Tac3 than the first to third inductors 31 to 33. The fourth coil 36D is connected in parallel to the third coil 36C. The input side of the power conversion device 10 is three-phase, while the common mode filter 35 has four coils in order to reduce the rated current of the coils and to miniaturize the common mode filter 35. This will be described in detail later.

As shown in FIG. 2, the common mode filter 35 includes a common core 37 around which the coils 36A to 36D are wound. The core 37 is annular (specifically, circular) and is made of, for example, ferrite. The coils 36A to 36D are arranged at equal intervals around the core 37. In this embodiment, the coils 36A to 36D have the same rated current (specifically, the temperature rise rated current). For example, by making the number of turns and wire diameter the same for the coils 36A to 36D, the rated current for the coils 36A to 36D can be set to the same value.

The power conversion device 10 includes a single-phase charging switch 46. The single-phase charging switch 46 connects a portion of the first path 41 closer to the first AC terminal Tac1 than the first coil 36A and a portion of the second path 42 closer to the second AC terminal Tac2 than the second coil 36B. When the single-phase charging switch 46 is turned on, it allows bidirectional current flow, and when the single-phase charging switch 46 is turned off, it prevents bidirectional current flow. The single-phase charging switch 46 may connect, for example, the first AC terminal Tac1 and the second AC terminal Tac2.

The power conversion device 10 is equipped with a DC side voltage sensor 50 and an AC side voltage sensor 51. The DC side voltage sensor 50 detects the terminal voltage of the DC side capacitor 34, and the AC side voltage sensor 51 detects the voltage difference between the first AC terminal Tac1 and the ground of the power conversion device 10.

The power conversion device 10 is equipped with first to third current sensors 61 to 63. The first current sensor 61 detects the current flowing through the first inductor 31, the second current sensor 62 detects the current flowing through the second inductor 32, and the third current sensor 63 detects the current flowing through the third inductor 33. The detection values of each of the sensors 50, 51, 61 to 63 are input to a control device 70, which serves as a control unit provided in the power conversion device 10.

The control device 70 is mainly composed of a microcomputer 71, which has a CPU. The functions provided by the microcomputer 71 can be provided by software recorded in a physical memory device and a computer that executes the software, by software alone, by hardware alone, or by a combination of these. For example, when the microcomputer 71 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a large number of logic circuits, or by an analog circuit. For example, the microcomputer 71 executes a program stored in a non-transitory tangible storage medium as a storage unit provided in the microcomputer 71. The program includes, for example, programs for the processes shown in Figures 5, 10, 14, etc., which will be described later. By executing the program, a method corresponding to the program is executed. The storage unit is, for example, a non-volatile memory. Note that the program stored in the storage unit can be updated via a communication network such as the Internet, for example, OTA (Over The Air).

The control device 70 performs three-phase charging control or single-phase charging control. The charging control is explained below using the flowchart in FIG. 4.

In step S10, it is determined whether or not a command for three-phase charging control has been issued. In this embodiment, as shown in FIG. 3, if it is determined that a three-phase AC power supply 21 is connected to the first to third AC terminals Tac1 to Tac3, it is determined that a command for three-phase charging control has been issued. In the three-phase AC power supply 21, the amplitudes and frequencies of the three-phase output voltages V1, V2, and V3 are the same, and the phases of the output voltages V1, V2, and V3 and the output current are shifted by 120° for each phase.

If the determination in step S10 is positive, three-phase charging control is performed in steps S11 and S12. More specifically, in step S11, the single-phase charging switch 46 is turned off.

In step S12, the first, second, and third upper arm switches S1H, S2H, and S3H and the first, second, and third lower arm switches S1L, S2L, and S3L are switched on alternately with dead times between them to convert the AC power input from the first AC terminal Tac1, the second AC terminal Tac2, and the third AC terminal Tac3 into DC power and output it from the high potential side DC terminal TdcH and the low potential side DC terminal TdcL. In each phase, the upper arm switches and the lower arm switches are alternately turned on with dead times between them. In each phase, the upper and lower arm switches have the same switching period.

If the determination in step S10 is negative, the process proceeds to step S13, where it is determined whether or not a single-phase charging control instruction has been issued. In this embodiment, as shown in FIG. 4, if it is determined that the single-phase AC power supply 22 is connected to the first AC terminal Tac1 and the third AC terminal Tac3, it is determined that a single-phase charging control instruction has been issued. In this embodiment, the amplitude Vac of the output voltage of the single-phase AC power supply 22 is the same as the amplitude of the output voltage of the three-phase AC power supply 21. In addition, the frequency of the output voltage of the single-phase AC power supply 22 is the same as the frequency of the output voltage of the three-phase AC power supply 21.

If the determination in step S13 is positive, single-phase charging control is performed in steps S14 and S15. More specifically, in step S14, the single-phase charging switch 46 is turned on.

In step S15, the first upper arm switch S1H, the first lower arm switch S1L, the second upper arm switch S2H, and the second lower arm switch S2L are switched on in order to convert the AC power input from the first AC terminal Tac1 and the third AC terminal Tac3 into DC power and output it from the high potential side DC terminal TdcH and the low potential side DC terminal TdcL. In each phase, the upper arm switch and the lower arm switch are alternately turned on in synchronization with each other with a dead time in between. In each phase, one switching period of the upper and lower arm switches is the same, and is the same as one switching period during three-phase charging control.

In step S15, in a first period in which an AC current flows from the third AC terminal Tac3 to the first AC terminal Tac1 via the single-phase AC power supply 22, the third lower arm switch S3L is turned on and the third upper arm switch S3H is turned off. On the other hand, in a second period in which a current flows from the first AC terminal Tac1 to the third AC terminal Tac3 via the single-phase AC power supply 22, the third upper arm switch S3H is turned on and the third lower arm switch S3L is turned off. Whether the current timing is included in the first period or the second period may be determined based on, for example, the detection value of the first current sensor 61.

Incidentally, during single-phase charging control, when the DC power input from each DC terminal TdcH, TdcL is converted to AC power by switching control of the first upper and lower arm switches S1H, S1L and the second upper and lower arm switches S2H, S2L and output from the first and third AC terminals Tac1, Tac3, in step S15, during the first period when current flows from the third AC terminal Tac3 to the first AC terminal Tac1 via the single-phase AC power source 22, the third upper arm switch S3H is turned on and the third lower arm switch S3L is turned off. On the other hand, during the second period when current flows from the first AC terminal Tac1 to the third AC terminal Tac3 via the single-phase AC power source 22, the third lower arm switch S3L is turned on and the third upper arm switch S3H is turned off.

Next, the three-phase charging control will be described using FIG. 6. FIG. 6 is a block diagram of the three-phase charging control executed by the control device 70.

The voltage control unit 80 calculates the d-axis target current Idref for controlling the terminal voltage of the DC side capacitor 34 detected by the DC side voltage sensor 50 (hereinafter, the DC voltage detection value Vdcr) to the target DC voltage Vdcref (e.g., 800 V). In detail, the voltage control unit 80 includes a voltage deviation calculation unit 81 and a voltage feedback control unit 82. The voltage deviation calculation unit 81 calculates the voltage deviation ΔV by subtracting the DC voltage detection value Vdcr from the target DC voltage Vdcref. The target DC voltage Vdcref may be set, for example, based on the rated voltages of the upper and lower arm switches S1H to S4L and the DCDC converter 24.

The voltage feedback control unit 82 calculates the d-axis target current Idref as a manipulated variable for feedback-controlling the voltage deviation ΔV to 0. The feedback control in the voltage feedback control unit 82 is, for example, proportional-integral control.

The electrical angle calculation unit 83 calculates the electrical angle θe based on the voltage detected by the AC side voltage sensor 51 (hereinafter, the AC voltage detection value V1r). In this embodiment, the electrical angle θe at the zero cross timing (specifically, for example, the zero up cross timing) of the AC voltage detection value V1r is set to 0°, and the electrical angle θe at the next zero up cross timing is set to 360°. As a result, one cycle of the AC voltage detection value V1r corresponds to one electrical angle cycle (0° to 360°). In this embodiment, the AC voltage detection value V1r is positive when the voltage of the first AC terminal Tac1 is higher than the voltage of the ground of the power conversion device 10. The ground is connected to the neutral point of the three-phase AC power source 21 or the single-phase AC power source 22.

The two-phase conversion unit 84 converts the first, second, and third current detection values i1r, i2r, and i3r in the three-phase fixed coordinate system into d- and q-axis currents Idr and Iqr in the two-phase rotating coordinate system (dq-axis coordinate system) based on the currents detected by the first, second, and third current sensors 61, 62, and 63 (hereinafter, the first, second, and third current detection values i1r, i2r, and i3r) and the electrical angle θe. In this embodiment, the first, second, and third current detection values i1r, i2r, and i3r are positive when they flow from the first, second, and third AC terminals Tac1, Tac2, and Tac3 toward the first, second, and third inductors 31, 32, and 33.

The current control unit 85 includes a d-axis deviation calculation unit 86, a d-axis feedback control unit 87, a q-axis deviation calculation unit 88, and a q-axis feedback control unit 89.

The d-axis deviation calculation unit 86 calculates the d-axis current deviation ΔId by subtracting the d-axis current Idr from the d-axis target current Idref. The d-axis feedback control unit 87 calculates the d-axis target voltage Vdref as a manipulated variable for feedback controlling the d-axis current deviation ΔId to zero. The feedback control in the d-axis feedback control unit 87 is, for example, proportional-integral control.

The q-axis deviation calculation unit 88 calculates the q-axis current deviation ΔIq by subtracting the q-axis current Iqr from the q-axis target current Iqref. The q-axis target current Iqref is a target value of the reactive current, and in this embodiment, is set to 0 to make the power factor 1. Making the power factor 1 means making the phase difference between the first, second, and third output voltages V1, V2, and V3 of the three-phase AC power supply 21 and the first, second, and third current detection values i1r, i2r, and i3r 0. The q-axis feedback control unit 89 calculates the q-axis target voltage Vqref as a manipulated variable for feedback controlling the q-axis current deviation ΔIq to 0. The feedback control in the q-axis feedback control unit 89 is, for example, proportional-integral control.

The three-phase conversion unit 90 converts the d- and q-axis target voltages Vdref, Vqref in the two-phase rotating coordinate system into first, second, and third target voltages Vleg1ref, Vleg2ref, and Vleg3ref in the three-phase fixed coordinate system based on the d- and q-axis target voltages Vdref, Vqref and the electrical angle θe. The first, second, and third target voltages Vleg1ref, Vleg2ref, and Vleg3ref are sinusoidal signals whose phases are shifted by 120° in electrical angle. The sinusoidal signals are signals that become 0 every 180° of electrical angle.

The PWM generating unit 91 generates a first upper and lower arm drive signal to be supplied to the gates of the first upper and lower arm switches S1H and S1L, a second upper and lower arm drive signal to be supplied to the gates of the second upper and lower arm switches S2H and S2L, and a third upper and lower arm drive signal to be supplied to the gates of the third upper and lower arm switches S3H and S3L by pulse width modulation (PWM) based on a comparison of the magnitude of the first, second, and third target voltages Vleg1ref, Vleg2ref, and Vleg3ref with the carrier signal. The carrier signal is, for example, a triangular wave signal, and one cycle of the carrier signal is sufficiently shorter than one electrical angle cycle (0° to 360°). In one electrical angle cycle, the switching patterns of the first upper and lower arm switches S1H and S1L, the switching patterns of the second upper and lower arm switches S2H and S2L, and the switching patterns of the third upper and lower arm switches S3H and S3L are shifted in phase by 120°.

In this embodiment, during three-phase charging control, the first, second, and third target voltages Vleg1ref, Vleg2ref, and Vleg3ref are calculated in the three-phase conversion unit 90 so that the first DC power P1, the second DC power P2, and the third DC power P3 are equal. The first, second, and third DC powers P1, P2, and P3 are individual DC powers output from the three-phase AC power source 21 through the first, second, and third inductors 31, 32, and 33 at the DC terminals TdcH and TdcL. This causes the effective values of the currents flowing through the first, second, and third inductors 31, 32, and 33 to be the same value (e.g., 16 Arms).

Incidentally, the control device 70 may perform switching control of the upper and lower arm switches S1H to S3L of the first to third phases based on average current mode control or the like as the three-phase charging control, instead of the control shown in FIG. 6.

Next, single-phase charging control will be explained using FIG. 7. FIG. 7 is a block diagram of single-phase charging control executed by the control device 70.

In the control device 70, the filter unit 112 performs low-pass filtering on the DC voltage detection value Vdcr. This removes the harmonic components of the output voltage of the single-phase AC power supply 22 contained in the DC voltage detection value Vdcr. The harmonic components are, for example, components of the secondary frequency of the output voltage (e.g., 100 Hz or 120 Hz).

The voltage control unit 101 includes a voltage deviation calculation unit 102 and a voltage feedback control unit 103. The voltage deviation calculation unit 102 calculates a voltage deviation ΔV by subtracting the DC voltage detection value Vdcr from the target DC voltage Vdcref from which harmonic components have been removed in the filter unit 112. The voltage feedback control unit 103 calculates a target current amplitude Iampref as a manipulated variable for feedback controlling the voltage deviation ΔV to 0. The feedback control in the voltage feedback control unit 103 is, for example, proportional-integral control.

The electrical angle calculation unit 83 calculates the electrical angle θe based on the AC voltage detection value V1r. The sine wave generation unit 109 generates a sine wave signal "sin×θe" based on the electrical angle θe.

The current control unit 105 includes a target current calculation unit 106, a current deviation calculation unit 107, and a current feedback control unit 108.

The target current calculation unit 106 calculates the target current Iacref by multiplying the target current amplitude Iampref by the sine wave signal "sin x θe". The target current Iacref fluctuates with the same period as the AC voltage detection value V1r.

The current deviation calculation unit 107 calculates the current deviation ΔI by subtracting the sum of the first current detection value i1r and the second current detection value i2r from the target current Iacref. The sum of the first current detection value i1r and the second current detection value i2r is calculated in the current addition unit 110.

The current feedback control unit 108 calculates the first and second target voltages Vleg1ref and Vleg2ref as operation amounts for feedback control of the current deviation ΔI to 0. The feedback control in the current feedback control unit 108 is, for example, proportional-integral control. The first and second target voltages Vleg1ref and Vleg2ref are signals of the same phase. In this embodiment, during single-phase charging control, the first and second target voltages Vleg1ref and Vleg2ref are calculated in the current feedback control unit 108 so that the first DC power P1 and the second DC power P2 are equal.

The PWM generating unit 111 generates a first upper and lower arm drive signal to be supplied to the gates of the first upper and lower arm switches S1H and S1L and a second upper and lower arm drive signal to be supplied to the gates of the second upper and lower arm switches S2H and S2L by pulse width modulation based on a magnitude comparison between the first and second target voltages Vleg1ref and Vleg2ref and the carrier signal. In this embodiment, in one electrical angle cycle, the phase difference between the switching pattern of the first upper and lower arm switches S1H and S1L and the switching pattern of the second upper and lower arm switches S2H and S2L is 0°. In other words, the on-switching timing and the off-switching timing of the first upper arm switch S1H and the second upper arm switch S2H are synchronized, and the on-switching timing and the off-switching timing of the first lower arm switch S1L and the second lower arm switch S2L are synchronized.

In this embodiment, during single-phase charging control, the first and second target voltages Vleg1ref and Vleg2ref are calculated in the current feedback control unit 108 so that the first DC power P1 and the second DC power P2 are equal. As described above, the first and second DC powers P1 and P2 are individual DC powers output from the three-phase AC power source 21 via the first and second inductors 31 and 32 and output from the DC terminals TdcH and TdcL.

Because the third coil 36C and the fourth coil 36D are connected in parallel, during single-phase charging control, the current flowing through the third path 43 is distributed to the third and fourth coils 36C and 36D, and in this embodiment, is distributed equally. Therefore, the effective values of the currents flowing through the first to fourth coils 36A to 36D can be made the same value (e.g., 16 Arms), and the rated currents (specifically, the temperature rise rated currents) of the first to fourth coils 36A to 36D can be made the same value.

Figure 8 shows a configuration according to a comparative example. In the comparative example, the common mode filter 35 does not include the fourth coil 36D.

During single-phase charging control in the comparative example, the effective value of the current flowing through the third coil 36C is greater than the effective value of the current flowing through the first and second coils 36A and 36B. Specifically, the effective value of the current flowing through the third coil 36C is twice the effective value of the current flowing through the first and second coils 36A and 36B (e.g., 32 Arms). In general, the rated current of each coil constituting a common mode filter is set to the same value as the rated current of the coil with the largest effective value of the current flowing through each coil. For this reason, it is necessary to match the rated current of the first and second coils 36A and 36B to the rated current of the third coil 36C. When the rated current increases, the coils become larger, so in the comparative example, the first and second coils 36A and 36B become larger.

In contrast, in this embodiment, the rated current of the third and fourth coils 36C and 36D can be reduced to the rated current of the first and second coils 36A and 36B. As a result, the third and fourth coils 36C and 36D can be made smaller, and the common mode filter 35 can be made smaller.

<Modification of the First Embodiment>
The number of specific coils connected in parallel to the third coil 36C is not limited to one, and may be multiple.

Second Embodiment
The second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment.

In this embodiment, as shown in FIG. 9, the power conversion device 10 includes a series connection of a fourth upper arm switch S4H, which is an "upper arm rectifier," and a fourth lower arm switch S4L, which is a "lower arm rectifier," as well as a second single-phase charging switch 47 and a third single-phase charging switch 487. In this embodiment, the fourth upper and lower arm switches S4H and S4L are N-channel MOSFETs having body diodes. The second and third single-phase charging switches 47 and 48 allow bidirectional current flow when they are turned on, and prevent bidirectional current flow when they are turned off. In this embodiment, the single-phase charging switch 46 is referred to as the first single-phase charging switch 46.

The second single-phase charging switch 47 and the third single-phase charging switch 48 are provided to reduce the effective value of the current flowing through the third inductor 33 during single-phase charging control and to reduce the rated current of the third inductor 33. The second single-phase charging switch 47 connects the connection point of the fourth upper and lower arm switches S4H and S4L to a portion of the third path 43 between the third inductor 33 and the third coil 36C. The third single-phase charging switch 48 connects a portion of the third path 43 closer to the third AC terminal Tac3 than the third coil 36C to the fourth AC terminal Tac4. The third single-phase charging switch 48 may also connect the third AC terminal Tac3 and the fourth AC terminal Tac4.

The charging control performed by the control device 70 will be explained using Figure 10.

In step S20, it is determined whether or not a command for three-phase charging control has been issued. In this embodiment, as shown in FIG. 11, if it is determined that a three-phase AC power supply 21 is connected to the first to third AC terminals Tac1 to Tac3, it is determined that a command for three-phase charging control has been issued. Note that in FIG. 11, the neutral point of the three-phase AC power supply 21 is connected to the fourth AC terminal Tac4, but the neutral point does not have to be connected to the fourth AC terminal Tac4.

If the answer is yes in step S20, three-phase charging control is performed in steps S21 and S22. More specifically, in step S21, the first to third single-phase charging switches 46 to 48 and the fourth upper and lower arm switches S4H and S4L are turned off (see FIG. 11).

In step S22, similar to step S12 in FIG. 5, the AC power input from the first AC terminal Tac1, the second AC terminal Tac2, and the third AC terminal Tac3 is converted into DC power and output from the high-potential side DC terminal TdcH and the low-potential side DC terminal TdcL, so that switching control is performed on the first, second, and third upper arm switches S1H, S2H, and S3H and the first, second, and third lower arm switches S1L, S2L, and S3L.

If the determination in step S20 is negative, the process proceeds to step S23, where it is determined whether or not a single-phase charging control command has been issued. In this embodiment, as shown in FIG. 12, if it is determined that the single-phase AC power source 22 is connected to the first AC terminal Tac1 and the fourth AC terminal Tac4, it is determined that a single-phase charging control command has been issued.

If the determination in step S23 is positive, single-phase charging control is performed in steps S24 and S25. More specifically, in step S24, the first to third single-phase charging switches 46 to 48 are turned on. Also, the third upper and lower arm switches S3H, S3L and the fourth upper and lower arm switches S4H, S4L are turned off. This allows current to flow only via the body diodes in the third upper and lower arm switches S3H, S3L and the fourth upper and lower arm switches S4H, S4L.

In step S25, similar to step S15, the first upper arm switch S1H, the first lower arm switch S1L, the second upper arm switch S2H, and the second lower arm switch S2L are switched on in a synchronous manner and alternately, with a dead time in between, to convert the AC power input from the first AC terminal Tac1 and the fourth AC terminal Tac4 into DC power and output it from the high potential side DC terminal TdcH and the low potential side DC terminal TdcL. In each phase, the upper arm switch and the lower arm switch are alternately turned on in a synchronous manner, with a dead time in between.

The series connection of the third upper and lower arm switches S3H and S3L is referred to as the third leg, and the series connection of the fourth upper and lower arm switches S4H and S4L is referred to as the fourth leg. During single-phase charging control, a current flows through the fourth leg in addition to the third leg and the third path 43. Therefore, compared to the first embodiment, the current flowing through the third inductor 33 can be reduced, and the rated current (specifically, the temperature rise rated current) of the third inductor 33 can be reduced. This provides the effect of the first embodiment, as well as the effect of making the third inductor 33 smaller.

Third Embodiment
The third embodiment will be described below with reference to the drawings, focusing on the differences from the second embodiment. In this embodiment, as shown in Fig. 13, the power conversion device 10 includes a three-phase charging switch 49. The three-phase charging switch 49 is provided in a portion of the third path 43 between the third inductor 33 and the third coil 36C. The three-phase charging switch 49 allows bidirectional current flow when it is turned on, and prevents bidirectional current flow when it is turned off.

The charging control performed by the control device 70 will be explained using Figure 14.

In step S30, similar to step S20 in FIG. 10, it is determined whether a command for three-phase charging control has been issued.

If the determination in step S30 is affirmative, three-phase charging control is performed in steps S31 and S32. In detail, in step S31, the first to third single-phase charging switches 46 to 48 and the fourth upper and lower arm switches S4H and S4L are turned off, and the three-phase charging switch 49 is turned on (see FIG. 15).

In step S32, similar to step S12, the switching of the first, second, and third upper arm switches S1H, S2H, and S3H and the first, second, and third lower arm switches S1L, S2L, and S3L is controlled to convert the AC power input from the first AC terminal Tac1, the second AC terminal Tac2, and the third AC terminal Tac3 into DC power and output it from the high potential side DC terminal TdcH and the low potential side DC terminal TdcL.

If the determination in step S30 is negative, the process proceeds to step S33. In step S33, similar to step S23, it is determined whether or not a single-phase charging control command has been issued.

If the answer is yes in step S33, single-phase charging control is performed in steps S34 and S35. More specifically, in step S34, the first to third single-phase charging switches 46 to 48 are turned on, and the three-phase charging switch 49 and the third upper and lower arm switches S3H and S3L are turned off (see FIG. 16).

In step S35, the first upper arm switch S1H, the first lower arm switch S1L, the second upper arm switch S2H, and the second lower arm switch S2L are switched on in the same manner as in step S15, so that the AC power input from the first AC terminal Tac1 and the fourth AC terminal Tac4 is converted into DC power and output from the high potential side DC terminal TdcH and the low potential side DC terminal TdcL. In each phase, the upper arm switch and the lower arm switch are alternately turned on in synchronization with each other, with a dead time in between.

In step S35, in a first period in which an AC current flows from the fourth AC terminal Tac4 to the first AC terminal Tac1 via the single-phase AC power supply 22, the fourth lower arm switch S4L is turned on and the fourth upper arm switch S4H is turned off. On the other hand, in a second period in which a current flows from the first AC terminal Tac1 to the fourth AC terminal Tac4 via the single-phase AC power supply 22, the fourth upper arm switch S4H is turned on and the fourth lower arm switch S4L is turned off. Whether the current timing is included in the first period or the second period may be determined based on, for example, the detection value of the first current sensor 61.

In this embodiment, the three-phase charging switch 49 is turned off during single-phase charging control, so no current flows through the third inductor 33. This allows the rated current of the third inductor 33 to be further reduced, and therefore the third inductor 33 can be made smaller.

<Other embodiments>
Each of the above embodiments may be modified as follows.

- During single-phase charging control, the control device 70 may drive the first, second upper and lower arm switches S1H, S1L, S2H and S2L in an interleaved manner. Interleaved driving is a switching control in which the timing at which the first upper arm switch S1H is switched on and the timing at which the second upper arm switch S2H is switched on are shifted by 180° in electrical angle.

- In the case where bidirectional power conversion is not performed during the single-phase charging control of the second and third embodiments, and only unidirectional power conversion from AC power to DC power is performed, upper and lower arm diodes may be provided instead of the fourth upper and lower arm switches S4H and S4L. The cathode, which is the high potential side terminal of the upper arm diode, is connected to the high potential side path 30H, and the anode, which is the low potential side terminal of the lower arm diode, is connected to the low potential side path 30L. The anode of the upper arm diode and the cathode of the lower arm diode are connected.

- The power conversion device is not limited to an on-board charger, and may have the configuration shown in FIG. 17. The power conversion device 10 shown in FIG. 17 is a device used in facilities that handle large amounts of power, such as megawatts, and is equipped with a four-leg AC-DC conversion circuit that is generally used as an active filter circuit for a three-phase system. Note that in FIG. 17, for convenience, the same reference numerals are used for configurations that correspond to those shown previously.

The power conversion device 10 includes a common mode filter 135. The common mode filter 135 is a five-phase filter including a first coil 136A, a second coil 136B, a third coil 136C, a fourth coil 136D, and a fifth coil 136E as a "specific coil." In other words, while the input phase is four phases, the common mode filter 135 is five phases, one phase more. The connection point of the fourth upper and lower arm switches S4H, S4L and the fourth AC terminal Tac4 are connected by a connection path 140. The first to third coils 136A to 136C are provided in the first to third paths 41 to 43, and the fourth coil 136D is provided in the connection path 140.

There is a possibility that a current larger than that flowing through the first to third paths 41 to 43 may flow through the connection path 140. For this reason, the fifth coil 136E is connected in parallel to the fourth coil 136D provided in the connection path 140. This allows the current flowing through the connection path 140 to be distributed to the fourth and fifth coils 136D and 136E, and the rated current of the fourth and fifth coils 136D and 136E can be reduced.

The power conversion device may have the configuration shown in FIG. 18. The power conversion device 10 shown in FIG. 18 includes a four-leg AC-DC conversion circuit (inverter) that is applied to a three-phase rotating electric machine 200. Note that in FIG. 18, the same reference numerals are used for the configuration corresponding to the configuration shown in FIG. 17 above, for convenience.

The first end of the armature winding 201 of the rotating electric machine 200 is connected to the first to third AC terminals Tac1 to Tac3. The second ends of the armature windings 201 of each phase are connected at a neutral point. This neutral point is connected to the connection point of the fourth upper and lower arm switches S4H and S4L by a connection path 210.

There is a possibility that a current larger than that flowing through the first to third paths 41 to 43 may flow through the connection path 210. For this reason, the fifth coil 136E is connected in parallel to the fourth coil 136D provided in the connection path 210. This allows the current flowing through the connection path 210 to be distributed to the fourth and fifth coils 136D and 136E.

- In the first to third embodiments, the number of specific coils connected in parallel to the third coil 36C, and the number of specific coils connected in parallel to the fourth coil 136D in Figs. 17 and 18 are not limited to one, but may be multiple. In addition, the phase of the coil to which the specific coil is connected is not limited to one, but may be multiple phases excluding all phases.

- The power conversion device 10 may have only the second function of converting AC power input via an AC terminal connected to an external AC power source into DC power and outputting it from the DC terminal, and the second function of converting DC power input from the DC terminal into AC power and outputting it from the AC terminal.

The first upper arm switch may be composed of multiple N-channel MOSFETs connected in parallel. The same applies to the first lower arm switch and the second to fourth upper and lower arm switches.

The upper and lower arm switches are not limited to N-channel MOSFETs, but may be, for example, IGBTs with freewheel diodes connected in inverse parallel. In this case, the collector of the IGBT corresponds to the high-potential terminal, and the emitter corresponds to the low-potential terminal.

-Instead of the DC side capacitor 34, for example, a small-capacity storage battery that can be charged and discharged may be provided.

The power storage unit connected to the output of the DCDC converter 24 is not limited to a storage battery, but may be, for example, a large-capacity electric double-layer capacitor, or both a storage battery and an electric double-layer capacitor.

- The mobile body on which the power conversion device is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. Furthermore, the power conversion device is not limited to being mounted on a mobile body, but may be a stationary device.

The control unit and the method described in the present disclosure may be realized by a dedicated computer provided by configuring a processor and memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control unit and the method described in the present disclosure may be realized by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described in the present disclosure may be realized by one or more dedicated computers configured by combining a processor and memory programmed to execute one or more functions with a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transient tangible recording medium as instructions executed by the computer.

10...power conversion device, 21...three-phase AC power source, 22...single-phase AC power source, 31-33...first to third inductors, 46...single-phase charging switch, 70...control device, 35...common mode filter, S1H, S2H, S3H...first to third upper arm switches, S1L, S2L, S3L...first to third lower arm switches.

Claims (9)

A plurality of AC terminals (Tac1 to Tac4) for multiple phases;
DC terminals (TdcH, TdcL),
AC/DC conversion circuits (S1H to S4L) having at least one of a function of converting AC power inputted from the AC terminals into DC power and outputting the DC power from the DC terminals, and a function of converting DC power inputted from the DC terminals into AC power and outputting the AC power from the AC terminals;
In a power conversion device (10) comprising:
An electrical path (41 to 43, 140, 210) provided corresponding to each phase and connecting the AC/DC conversion circuit and the AC terminal;
A common mode filter (35, 135);
Equipped with
The common mode filter includes:
Coils (36A to 36C, 136A to 136D) provided in the electrical paths of the respective phases;
A specific coil (36D, 136E) connected in parallel to at least one of the coils;
A core (37) around which each of the coils and the specific coil are wound;
A power conversion device comprising: The AC terminals include a first AC terminal (Tac1), a second AC terminal (Tac2), and a third AC terminal (Tac3),
The DC terminals include a high potential side DC terminal (TdcH) and a low potential side DC terminal (TdcL),
a three-phase AC power source (21) is connectable to the first AC terminal, the second AC terminal, and the third AC terminal, and a single-phase AC power source (22) is connectable to the first AC terminal and the third AC terminal,
The AC/DC conversion circuit includes:
A series connection of a first upper arm switch (S1H) and a first lower arm switch (S1L);
A series connection of a second upper arm switch (S2H) and a second lower arm switch (S2L);
A series connection of a third upper arm switch (S3H) and a third lower arm switch (S3L);
having
The electrical path includes:
a first path (41) electrically connecting a connection point between the first upper arm switch and the first lower arm switch and the first AC terminal;
a second path (42) electrically connecting a connection point between the second upper arm switch and the second lower arm switch and the second AC terminal;
a third path (43) electrically connecting a connection point between the third upper arm switch and the third lower arm switch and the third AC terminal;
is provided,
A first inductor (31) provided in the first path;
a second inductor (32) provided in the second path;
a third inductor (33) provided in the third path;
Equipped with
high potential side terminals of the first, second and third upper arm switches are electrically connected to the high potential side DC terminal,
low potential side terminals of the first, second and third lower arm switches are electrically connected to the low potential side DC terminal,
The coil constituting the common mode filter (35) is
a first coil (36A) provided in the first path closer to the first AC terminal than the first inductor;
a second coil (36B) provided in the second path closer to the second AC terminal than the second inductor;
a third coil (36C) provided on the third path closer to the third AC terminal than the third inductor;
The power converter of claim 1 . a single-phase charging switch (46) electrically connecting the first AC terminal and the second AC terminal;
The control unit (70),
Equipped with
The specific coil (36D) is connected in parallel to the third coil,
3. The power conversion device of claim 2, wherein when the control unit determines that the single-phase AC power source is connected to the first AC terminal and the third AC terminal, with the single-phase charging switch turned on, the control unit performs switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch to perform power conversion between the first AC terminal and the third AC terminal and the high potential side DC terminal and the low potential side DC terminal. The AC terminals include a first AC terminal (Tac1), a second AC terminal (Tac2), a third AC terminal (Tac3), and a fourth AC terminal (Tac4),
The DC terminals include a high potential side DC terminal (TdcH) and a low potential side DC terminal (TdcL),
a three-phase AC power source (21) is connectable to the first AC terminal, the second AC terminal, and the third AC terminal, and a single-phase AC power source (22) is connectable to the first AC terminal and the fourth AC terminal,
The AC/DC conversion circuit includes:
A series connection of a first upper arm switch (S1H) and a first lower arm switch (S1L);
A series connection of a second upper arm switch (S2H) and a second lower arm switch (S2L);
A series connection of a third upper arm switch (S3H) and a third lower arm switch (S3L);
A series connection of an upper arm rectifier (S4H) and a lower arm rectifier (S4L);
having
The electrical path includes:
a first path (41) electrically connecting a connection point between the first upper arm switch and the first lower arm switch and the first AC terminal;
a second path (42) electrically connecting a connection point between the second upper arm switch and the second lower arm switch and the second AC terminal;
a third path (43) electrically connecting a connection point between the third upper arm switch and the third lower arm switch and the third AC terminal;
is provided,
A first inductor (31) provided in the first path;
a second inductor (32) provided in the second path;
a third inductor (33) provided in the third path;
a first single-phase charging switch (46) electrically connecting the first AC terminal and the second AC terminal;
A second single-phase charging switch (47);
a third single-phase charging switch (48);
The control unit (70),
Equipped with
high potential side terminals of the first, second and third upper arm switches are electrically connected to the high potential side DC terminal,
low potential side terminals of the first, second and third lower arm switches are electrically connected to the low potential side DC terminal,
The coil constituting the common mode filter (35) is
a first coil (36A) provided in the first path closer to the first AC terminal than the first inductor;
a second coil (36B) provided in the second path closer to the second AC terminal than the second inductor;
a third coil (36C) provided on the third path closer to the third AC terminal than the third inductor;
is provided,
the second single-phase charging switch electrically connects a connection point between the upper arm rectifier and the lower arm rectifier and a portion of the third path that is closer to the third inductor than the third coil;
the third single-phase charging switch electrically connects the fourth AC terminal and a portion of the third path that is closer to the third AC terminal than the third coil;
when it is determined that the single-phase AC power source is connected to the first AC terminal and the fourth AC terminal, the control unit performs switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch in a state in which the first single-phase charging switch, the second single-phase charging switch, and the third single-phase charging switch are turned on, so as to perform power conversion between the first AC terminal and the fourth AC terminal and the high potential side DC terminal and the low potential side DC terminal;
The power conversion device according to claim 1 , wherein the specific coil (36D) is connected in parallel with the third coil. a three-phase charging switch (49) provided in a portion of the third path closer to the third inductor than a connection point with the second single-phase charging switch,
5. The power conversion device of claim 4, wherein when the control unit determines that the single-phase AC power source is connected to the first AC terminal and the fourth AC terminal, the control unit turns on the first single-phase charging switch, the second single-phase charging switch, and the third single-phase charging switch and turns off the three-phase charging switch, and performs switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch to perform power conversion between the first AC terminal and the fourth AC terminal and the high potential side DC terminal and the low potential side DC terminal. The power conversion device according to claim 4 or 5, wherein the upper arm rectifier and the lower arm rectifier allow current to flow from their own low potential side terminals to their own high potential side terminals. the specific coil is one,
The power conversion device according to any one of claims 2 to 5, wherein the rated currents of the first coil, the second coil, the third coil and the specific coil are set to the same value. a first AC terminal (Tac1), a second AC terminal (Tac2) and a third AC terminal (Tac3);
A high potential side DC terminal (TdcH) and a low potential side DC terminal (TdcL);
A computer (71);
A power conversion device (10) comprising:
A program applied to a power conversion device configured to allow a three-phase AC power supply (21) to be connected to the first AC terminal, the second AC terminal, and the third AC terminal, and configured to allow a single-phase AC power supply (22) to be connected to the first AC terminal and the third AC terminal,
The power conversion device is
A series connection of a first upper arm switch (S1H) and a first lower arm switch (S1L);
A series connection of a second upper arm switch (S2H) and a second lower arm switch (S2L);
A series connection of a third upper arm switch (S3H) and a third lower arm switch (S3L);
a first path (41) electrically connecting a connection point between the first upper arm switch and the first lower arm switch and the first AC terminal;
a second path (42) electrically connecting a connection point between the second upper arm switch and the second lower arm switch and the second AC terminal;
a third path (43) electrically connecting a connection point between the third upper arm switch and the third lower arm switch and the third AC terminal;
A first inductor (31) provided in the first path;
a second inductor (32) provided in the second path;
a third inductor (33) provided in the third path;
a single-phase charging switch (46) electrically connecting the first AC terminal and the second AC terminal;
A common mode filter (35);
Equipped with
high potential side terminals of the first, second and third upper arm switches are electrically connected to the high potential side DC terminal,
low potential side terminals of the first, second and third lower arm switches are electrically connected to the low potential side DC terminal,
The common mode filter includes:
a first coil (36A) provided in the first path closer to the first AC terminal than the first inductor;
a second coil (36B) provided in the second path closer to the second AC terminal than the second inductor;
a third coil (36C) provided on the third path closer to the third AC terminal than the third inductor;
A specific coil (36D);
a core (37) around which the first coil, the second coil, the third coil and the specific coil are wound;
having
The specific coil (36D) is connected in parallel to the third coil,
a process of determining whether the single-phase AC power supply is connected to the first AC terminal and the third AC terminal in the computer;
a process of performing switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch in order to perform power conversion between the first AC terminal and the third AC terminal and the high potential side DC terminal and the low potential side DC terminal in a state in which the single-phase charging switch is turned on when it is determined that the single-phase AC power source is connected to the first AC terminal and the third AC terminal;
A program to execute. a first AC terminal (Tac1), a second AC terminal (Tac2), a third AC terminal (Tac3) and a fourth AC terminal (Tac4);
A high potential side DC terminal (TdcH) and a low potential side DC terminal (TdcL);
A computer (71);
A power conversion device (10) comprising:
A program applied to a power conversion device configured to allow a three-phase AC power supply (21) to be connected to the first AC terminal, the second AC terminal, and the third AC terminal, and configured to allow a single-phase AC power supply (22) to be connected to the first AC terminal and the fourth AC terminal,
The power conversion device is
A series connection of a first upper arm switch (S1H) and a first lower arm switch (S1L);
A series connection of a second upper arm switch (S2H) and a second lower arm switch (S2L);
A series connection of a third upper arm switch (S3H) and a third lower arm switch (S3L);
A series connection of an upper arm rectifier (S4H) and a lower arm rectifier (S4L);
a first path (41) electrically connecting a connection point between the first upper arm switch and the first lower arm switch and the first AC terminal;
a second path (42) electrically connecting a connection point between the second upper arm switch and the second lower arm switch and the second AC terminal;
a third path (43) electrically connecting a connection point between the third upper arm switch and the third lower arm switch and the third AC terminal;
A first inductor (31) provided in the first path;
a second inductor (32) provided in the second path;
a third inductor (33) provided in the third path;
a first single-phase charging switch (46) electrically connecting the first AC terminal and the second AC terminal;
A second single-phase charging switch (47);
a third single-phase charging switch (48);
A common mode filter (35);
Equipped with
high potential side terminals of the first, second and third upper arm switches are electrically connected to the high potential side DC terminal,
low potential side terminals of the first, second and third lower arm switches are electrically connected to the low potential side DC terminal,
The common mode filter includes:
a first coil (36A) provided in the first path closer to the first AC terminal than the first inductor;
a second coil (36B) provided in the second path closer to the second AC terminal than the second inductor;
a third coil (36C) provided in the third path closer to the third AC terminal than the third inductor;
A specific coil (36D);
a core (37) around which the first coil, the second coil, the third coil and the specific coil are wound;
having
the second single-phase charging switch electrically connects a connection point between the upper arm rectifier and the lower arm rectifier and a portion of the third path that is closer to the third inductor than the third coil;
the third single-phase charging switch electrically connects the fourth AC terminal and a portion of the third path that is closer to the third AC terminal than the third coil;
The specific coil (36D) is connected in parallel to the third coil,
a process of determining whether the single-phase AC power source is connected to the first AC terminal and the fourth AC terminal,
a process of performing switching control of the first upper arm switch, the first lower arm switch, the second upper arm switch, and the second lower arm switch in a state in which the first single-phase charging switch, the second single-phase charging switch, and the third single-phase charging switch are turned on when it is determined that the single-phase AC power source is connected to the first AC terminal and the fourth AC terminal, so as to perform power conversion between the first AC terminal and the third AC terminal and the high potential side DC terminal and the low potential side DC terminal;
A program to execute.

Images