Electrical device

Abstract

To provide an electrical device that can improve efficiency while suppressing the complexity of control during warm-up.SOLUTION: An electrical device 10 includes a power storage device 11, a rotating electric machine, a power control unit 10a, a motor temperature sensor 40a, and a battery temperature sensor 40b. The rotating electric machine includes coils α1, α2, β1, and β2. The power control unit 10a includes a first full-bridge circuit 12a and a second full-bridge circuit 12b connected across each of the coils α1 and α2, and a third full-bridge circuit 13a and a fourth full-bridge circuit 13b connected across each of the coils β1 and β2. The power control unit 10a controls the energization of the coils α1, α2, β1, and β2 according to the temperatures acquired by the temperature sensors 40a and 40b, and switches between a first mode in which the heat generation amount of the power storage device 11 is greater than that of the rotating electric machine, and a second mode in which the heat generation amount of the power storage device 11 is smaller than that of the first mode.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to electrical equipment. [Background technology]

[0002] In recent years, research and development has been conducted into charging mobility vehicles equipped with secondary batteries that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy. BACKGROUND ART Conventionally, there is known a control device that warms a battery by using a d-axis current value in vector control of a driving motor when a vehicle is stopped (see, for example, Patent Document 1). Also, for example, a control device is known that warms up two motors connected to a common power transmission gear by energizing the two motors so as to generate torque in opposite directions to each other (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-165526 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-178842 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in technologies related to charging and supplying power to mobility vehicles equipped with secondary batteries, it is necessary to improve energy efficiency while minimizing the complexity of the device configuration. For example, if the power storage device and the electric motor are heated independently and using different methods, as in the control device of the conventional technology described above, the heating control becomes complicated and cooperative control is not possible, which may result in the inability to appropriately set the temperatures of both the power storage device and the electric motor.

[0005] In order to solve the above-mentioned problems, the present invention aims to improve efficiency while suppressing the complexity of warm-up control, thereby contributing to energy efficiency. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the present invention employs the following aspects. (1): An electric device according to one aspect of the present invention (for example, electric device 10 in the embodiment) includes a power storage device (for example, power storage device 11 in the embodiment), a rotating electric machine (for example, rotating electric machine 16(M) in the embodiment) having a plurality of coils (for example, an α-phase first coil 23 (α1), an α-phase second coil 24 (α2), a β-phase first coil 33 (β1), and a β-phase second coil 34 (β2) in the embodiment), a power control unit (for example, power control unit 10a in the embodiment) connected to the power storage device and the rotating electric machine and controlling the exchange of power between the power storage device and the rotating electric machine, and a power control unit (for example, power control unit 10b in the embodiment) connected to the power storage device and the rotating electric machine. The power control unit is equipped with a first temperature acquisition unit (e.g., battery temperature sensor 40b in the embodiment) that acquires the temperature of the power storage device, and a second temperature acquisition unit (e.g., motor temperature sensor 40a in the embodiment) that acquires the temperature of the rotating electric machine, and the power control unit controls the flow of current to the multiple coils in accordance with the temperatures acquired by the first temperature acquisition unit and the second temperature acquisition unit, thereby switching between a first mode in which the heat generation amount of the power storage device is greater than the heat generation amount of the rotating electric machine, and a second mode in which the heat generation amount of the power storage device is smaller than the heat generation amount of the power storage device in the first mode.

[0007] (2): In the electric device described in (1) above, the rotating electric machine includes a stator core (for example, the stator core 42 in the embodiment) in which a slot (for example, the slot 43 in the embodiment) is formed, and the plurality of coils include a plurality of first coils (for example, the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) in the embodiment) that are magnetically coupled and share the slot of the stator core (for example, the slot 43 in the embodiment), and a plurality of second coils (for example, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) in the embodiment) that are magnetically coupled and share the slot of the stator core (for example, the slot 43 in the embodiment). The power control unit may include a plurality of first full bridge circuits (for example, a first full bridge circuit 12a and a second full bridge circuit 12b in the embodiment) connected to the plurality of first coils, and a plurality of second full bridge circuits (for example, a third full bridge circuit 13a and a fourth full bridge circuit 13b in the embodiment) connected to the plurality of second coils, and in the first mode, the switching phases of the plurality of first full bridge circuits and the plurality of second full bridge circuits may be opposite to each other, and in the second mode, the switching phases of the plurality of first full bridge circuits and the plurality of second full bridge circuits may be the same.

[0008] (3): In the electrical device described in (2) above, the spatial phases of the plurality of first coils and the plurality of second coils may be orthogonal, the plurality of first coils and the plurality of second coils may be open-ended, and the power control unit may set a phase difference of 90° between the switching phases of the plurality of first full-bridge circuits and the switching phases of the plurality of second full-bridge circuits according to the temperatures acquired by the first temperature acquisition unit and the second temperature acquisition unit.

[0009] (4): In the electric device described in (1) above, the rotating electric machine includes a stator core (for example, the stator core 42 in the embodiment) in which slots (for example, the slots 43 in the embodiment) are formed, and the plurality of coils include a plurality of first coils (for example, the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) in the embodiment) that are magnetically coupled and share the slots of the stator core (for example, the slots 43 in the embodiment), and a plurality of second coils (for example, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) in the embodiment) that are magnetically coupled and share the slots of the stator core (for example, the slots 43 in the embodiment), and the power control unit includes a plurality of first full-bridge circuits (for example, the first full-bridge circuit 12a and the second full-bridge circuit 12b in the embodiment) that are connected to the plurality of first coils, and a plurality of second coils (for example, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) in the embodiment) that are magnetically coupled and share the slots of the stator core (for example, the slots 43 in the embodiment). and a plurality of second full bridge circuits (for example, a third full bridge circuit 13a and a fourth full bridge circuit 13b in the embodiments) connected to the plurality of second coils, and two switchgears (for example, a first switch 22 in the embodiments) connected between the positive poles of the plurality of first full bridge circuits and between the negative poles of the plurality of first full bridge circuits, and a plurality of second full bridge circuits (for example, a third full bridge circuit 13a and a fourth full bridge circuit 13b in the embodiments) connected to the plurality of second coils, and in the first mode, the switching phases of the plurality of first full bridge circuits and the plurality of second full bridge circuits are reversed, and in the second mode, the inter-coil switchgear is connected, and the first switchgear (for example, the first switch 25 in the embodiments) of the two switchgears is connected to the disconnected state and the second switchgear (for example, the second switch 26 in the embodiments) is connected, thereby performing conversion between DC powers by the plurality of first full bridge circuits. [Effects of the Invention]

[0010] According to (1) above, by switching between the first mode and the second mode depending on the respective temperatures of the storage device and the rotating electric machine, the respective temperatures of the storage device and the rotating electric machine can be appropriately controlled even when, for example, there is a large difference between the temperature of the storage device and the temperature of the rotating electric machine.

[0011] In the case of (2) above, by switching between the opposite phase and the same phase of the switching phase, it is possible to reciprocally switch between the magnitude of iron loss according to the inductance and the magnitude of current or current ripple according to the inductance. For example, it is possible to easily adjust the relative amounts of heating of the electricity storage device due to the current ripple or current and heating of the rotating electrical machine due to iron loss, thereby enabling power savings.

[0012] In the case of (3) above, the magnitude of the current flowing through the power storage device can be reduced, and the relative amounts of heating of the power storage device and the rotating electrical machine can be adjusted in more detail.

[0013] In the case of (4) above, in the second mode, the magnitude of the current flowing through the storage device can be reduced compared to, for example, when the switching phases are in phase, and heating of the rotating electric machine can be prioritized with more power savings. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing a configuration of an electrical device according to an embodiment of the present invention. [Figure 2] 2 is a diagram illustrating the configuration of each full-bridge circuit and a rotating electric machine in the electric device according to the embodiment of the present invention. FIG. [Figure 3] 4 is a flowchart showing the operation of the electrical device according to the embodiment of the present invention. [Figure 4] 3 is a circuit diagram showing a current flow in a first mode in the electric device according to the embodiment of the present invention. FIG. [Figure 5] FIG. 4 is a diagram showing changes in current flowing through each coil and the power storage device in the first mode in the electric device according to the embodiment of the present invention. [Figure 6] FIG. 4 is a circuit diagram showing a current flow in a second mode in the electric device according to the embodiment of the present invention. [Figure 7] FIG. 6 is a diagram showing changes in current flowing through each coil and the power storage device in the second mode in the electric device according to the embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing changes in current flowing through each coil and the power storage device in a first mode of an electric appliance according to a first modified example of the embodiment of the present invention. [Figure 9] 10 is a flowchart showing the operation of an electric device according to a second modified example of the embodiment of the present invention. [Figure 10] FIG. 10 is a circuit diagram showing a current flow in a third mode in an electric device according to a second modified example of the embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing changes in current flowing through the α-phase second coil and the power storage device in the third mode in an electric device according to a second modified example of the embodiment of the present invention. [Figure 12] FIG. 10 is a configuration diagram of a rotating electric machine of an electric device according to a third modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an electric device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a diagram showing the configuration of an electric device 10 according to an embodiment. Fig. 2 is a diagram showing the configuration of each of full-bridge circuits 12a, 12b, 13a, 13b and a rotating electric machine 16 in the electric device 10 according to the embodiment. The electrical device 10 of the embodiment is mounted on, for example, an electric vehicle, an electric moving body, an electric machine, a power supply device, etc. Examples of the electric vehicle include an electric car equipped with a rotating electric machine as a power source, a saddle-ride vehicle, a kick scooter, a hybrid vehicle combining a rotating electric machine with an internal combustion engine, and a fuel cell vehicle combining a power storage device with a fuel cell. Examples of the electric moving body include a robot, an aircraft, and a surface or underwater moving body. Examples of the electric machine include construction machinery equipped with a rotating electric machine as a power source. Examples of the power supply device include a stationary or mobile power supply device that discharges and charges a power storage device.

[0016] (Electrical Equipment) 1 and 2, an electrical device 10 of the embodiment includes, for example, a power storage device 11, a first power conversion unit 12 and a second power conversion unit 13, a DC power supply connection unit 14 and an AC power supply connection unit 15, a rotating electrical machine 16(M), a gate drive unit 17, and an electronic control unit 18. Note that, for example, the first power conversion unit 12 and the second power conversion unit 13, the DC power supply connection unit 14 and the AC power supply connection unit 15, the gate drive unit 17, and the electronic control unit 18 configure a power control unit 10a.

[0017] The power storage device 11 is connected to a first power conversion unit 12 and a second power conversion unit 13, which will be described later. The power storage device 11 includes, for example, a plurality of battery cells connected in series or in parallel. Each battery cell is, for example, a secondary battery such as a lead-acid battery, a lithium-ion battery, a nickel-metal hydride battery, or an all-solid-state battery, a capacitor such as an electric double-layer capacitor, or a composite battery that combines a secondary battery and a capacitor. Each battery cell is repeatedly charged and discharged. The power storage device 11 exchanges power with the rotating electric machine 16 via the power control unit 10a. The power storage device 11 is charged by an external power source (an external DC power source and an external AC power source).

[0018] The first power conversion unit 12 includes a first full-bridge circuit 12a and a second full-bridge circuit 12b. Each of the first full-bridge circuit 12a and the second full-bridge circuit 12b includes a so-called H-bridge circuit formed by a plurality of switching elements bridge-connected in two phases. Each switching element is a transistor such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) made of silicon carbide (SiC) or an IGBT (Insulated Gate Bipolar Transistor). Each switching element is, for example, an N-channel MOSFET. The switching elements are, for example, pairs of transistors forming element units 21a, 21b of a high-side arm and a low-side arm of each phase. Each pair of transistors of each element unit 21a, 21b is, for example, a pair of transistors connected in parallel. Each full-bridge circuit 12a, 12b may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and emitter of each transistor.

[0019] The first power conversion unit 12 includes, for example, a first switch 22 connected between midpoints Q2 and Q3 of the first and second full-bridge circuits 12a and 12b. The midpoint Q2 of the first full-bridge circuit 12a is, for example, a connection point between the high-side arm element unit 21a (a2H) and the low-side arm element unit 21b (a2L), which are connected in series in the second phase of the first and second phases of the two phases of the first full-bridge circuit 12a. For example, the midpoint Q2 is a connection point between the source of the high-side arm element unit 21a (a2H) and the drain of the low-side arm element unit 21b (a2L). The midpoint Q3 of the second full-bridge circuit 12b is, for example, a connection point between the high-side arm element unit 21a (a3H) and the low-side arm element unit 21b (a3L), which are connected in series in the first phase of the first and second phases of the two phases of the second full-bridge circuit 12b. For example, the midpoint Q3 is the connection point between the source of the element portion 21a (a3H) of the high-side arm and the drain of the element portion 21b (a3L) of the low-side arm.

[0020] The first switch 22 is, for example, a bidirectional switch formed by two switching elements. Each switching element is a transistor such as a MOSFET or an IGBT, for example, an N-channel MOSFET. The first switch 22 includes, for example, two transistors connected in anti-series. The two transistors are connected in series in opposite directions, for example, by connecting their sources to each other. The first switch 22 switches between conducting and blocking the current between the midpoints Q2 and Q3 by turning on (conducting) and off (blocking) the two transistors. Each transistor may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and the emitter.

[0021] The first power conversion unit 12 is connected to an α-phase first coil 23 (α1) and an α-phase second coil 24 (α2) of a rotating electric machine 16 (described later). The α-phase first coil 23 is connected between midpoints Q1 and Q2 of a first full-bridge circuit 12a. The α-phase second coil 24 (α2) is connected between midpoints Q3 and Q4 of a second full-bridge circuit 12b. The midpoint Q1 of the first full-bridge circuit 12a is, for example, a connection point between a high-side arm element unit 21a (a1H) and a low-side arm element unit 21b (a1L) that are connected in series in the first phase of the first full-bridge circuit 12a. For example, the midpoint Q1 is a connection point between a source of the high-side arm element unit 21a (a1H) and a drain of the low-side arm element unit 21b (a1L). The midpoint Q4 of the second full-bridge circuit 12b is, for example, a connection point between the high-side arm element unit 21a (a4H) and the low-side arm element unit 21b (a4L), which are connected in series in the second phase of the second full-bridge circuit 12b. For example, the midpoint Q4 is a connection point between the source of the high-side arm element unit 21a (a4H) and the drain of the low-side arm element unit 21b (a4L).

[0022] The first power conversion unit 12 includes a first circuit breaker 25 connected between the positive electrodes of the first full bridge circuit 12a and the second full bridge circuit 12b, and a second circuit breaker 26 connected between the negative electrodes of the first full bridge circuit 12a and the second full bridge circuit 12b. Each of the first and second switchgears 25 and 26 is, for example, a contactor, and switches on (conducting) and off (disconnecting) the connection between the first full-bridge circuit 12a and the second full-bridge circuit 12b.

[0023] The first power conversion unit 12 includes, for example, a capacitor 27 connected between the positive and negative poles. The capacitor 27 smoothes voltage fluctuations that occur due to the switching operation of each switching element of the first power conversion unit 12 between on (conduction) and off (cutoff). The first power conversion unit 12 includes, for example, a first current sensor 28a arranged between the α-phase first coil 23 (α1) and the midpoint Q2, a second current sensor 28b arranged between the α-phase second coil 24 (α2) and the midpoint Q4, and a third current sensor 28c arranged between the storage device 11 and the first power conversion unit 12. For example, the first current sensor 28a detects the current flowing through the α-phase first coil 23 (α1), and the second current sensor 28b detects the current flowing through the α-phase second coil 24 (α2). The third current sensor 28c detects the current flowing between the first power conversion unit 12 and the power storage device 11.

[0024] The second power conversion unit 13 includes a third full-bridge circuit 13a and a fourth full-bridge circuit 13b. Each of the third full-bridge circuit 13a and the fourth full-bridge circuit 13b includes a so-called H-bridge circuit formed by, for example, a plurality of switching elements bridge-connected in two phases. Each switching element is, for example, a MOSFET such as SiC or a transistor such as IGBT. Each switching element is, for example, an N-channel MOSFET. The switching elements are, for example, pairs of transistors that form the high-side arm and low-side arm element units 31a, 31b of each phase. The pairs of transistors in each element unit 31a, 31b are, for example, connected in parallel. Each of the full-bridge circuits 13a and 13b may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and emitter of each transistor.

[0025] The second power conversion unit 13 includes, for example, a second switch 32 connected between midpoints R2 and R3 of the third and fourth full-bridge circuits 13a and 13b. The midpoint R2 of the third full-bridge circuit 13a is, for example, a connection point between the high-side arm element unit 31a (b2H) and the low-side arm element unit 31b (b2L), which are connected in series in the second phase of the first and second phases of the two phases of the third full-bridge circuit 13a. For example, the midpoint R2 is a connection point between the source of the high-side arm element unit 31a (b2H) and the drain of the low-side arm element unit 31b (b2L). The midpoint R3 of the fourth full-bridge circuit 13b is, for example, a connection point between the high-side arm element unit 31a (b3H) and the low-side arm element unit 31b (b3L), which are connected in series in the first phase of the first and second phases of the two phases of the fourth full-bridge circuit 13b. For example, the midpoint R3 is the connection point between the source of the element portion 31a (b3H) of the high-side arm and the drain of the element portion 31b (b3L) of the low-side arm.

[0026] The second switch 32 is, for example, a bidirectional switch formed by two switching elements. Each switching element is a transistor such as a MOSFET or an IGBT, for example, an N-channel MOSFET. The second switch 32 includes, for example, two transistors connected in anti-series. The two transistors are connected in series in opposite directions, for example, by connecting their sources to each other. The second switch 32 switches between conducting and blocking the current between the midpoints R2 and R3 by turning on (conducting) and off (blocking) the two transistors. Each transistor may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and the emitter.

[0027] The second power conversion unit 13 is connected to a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2) of a rotating electric machine 16 (described later). The β-phase first coil 33 is connected between midpoints R1 and R2 of a third full-bridge circuit 13a. The β-phase second coil 34 (β2) is connected between midpoints R3 and R4 of a fourth full-bridge circuit 13b. The midpoint R1 of the third full-bridge circuit 13a is, for example, a connection point between a high-side arm element unit 31a (b1H) and a low-side arm element unit 31b (b1L) that are connected in series in the first phase of the third full-bridge circuit 13a. For example, the midpoint R1 is a connection point between the source of the high-side arm element unit 31a (b1H) and the drain of the low-side arm element unit 31b (b1L). The midpoint R4 of the fourth full-bridge circuit 13b is, for example, a connection point between the high-side arm element unit 31a (b4H) and the low-side arm element unit 31b (b4L), which are connected in series in the second phase of the fourth full-bridge circuit 13b. For example, the midpoint R4 is a connection point between the source of the high-side arm element unit 31a (b4H) and the drain of the low-side arm element unit 31b (b4L).

[0028] The second power conversion unit 13 includes a third circuit breaker 35 connected between one end of the β-phase first coil 33 (β1) and the third full-bridge circuit 13a, and a fourth circuit breaker 36 connected between one end of the β-phase second coil 34 (β2) and the fourth full-bridge circuit 13b. Each of the third and fourth switchgears 35 and 36 is, for example, a contactor. The third switchgear 35 is connected, for example, between one end of the β-phase first coil 33 (β1) and a midpoint R1 of the first phase of the third full-bridge circuit 13a, and switches the connection between the β-phase first coil 33 (β1) and the midpoint R1 on (conduction) and off (disconnection). The fourth switchgear 36 is connected, for example, between one end of the β-phase second coil 34 (β2) and a midpoint R4 of the fourth phase of the fourth full-bridge circuit 13b, and switches the connection between the β-phase second coil 34 (β2) and the midpoint R4 on (conduction) and off (disconnection).

[0029] The second power conversion unit 13 includes, for example, a capacitor 37 connected between the positive and negative electrodes. The capacitor 37 smoothes voltage fluctuations that occur due to the switching operation of each switching element of the second power conversion unit 13 between on (conduction) and off (cutoff). The second power conversion unit 13 includes, for example, a fourth current sensor 38a arranged between the β-phase first coil 33 (β1) and the midpoint R2, and a fifth current sensor 38b arranged between the β-phase second coil 34 (β2) and the midpoint R4. For example, the fourth current sensor 38a detects the current flowing through the β-phase first coil 33 (β1), and the fifth current sensor 38b detects the current flowing through the β-phase second coil 34 (β2).

[0030] The second power conversion unit 13 includes, for example, an AC power supply connection unit 15 (described later) and a fifth switch 39 connected between the connection point of the β-phase first coil 33 (β1) and the third switch 35. The fifth switch 39 is, for example, a contactor. The fifth switch 39 switches the connection between the AC power supply connection unit 15 and the β-phase first coil 33 (β1) between on (conduction) and off (disconnection).

[0031] The DC power supply connection unit 14 and the AC power supply connection unit 15 include, for example, connectors for DC power and AC power of predetermined standards. The DC power supply connection unit 14 and the AC power supply connection unit 15 are connected to an external DC power supply (external DC power supply) and an AC power supply (external AC power supply) based on, for example, a commercial power supply connected to a power grid. The DC power supply connection unit 14 is connected, for example, to the negative electrode of the second power conversion unit 13 and to the midpoint of each of the first switch 22 and the second switch 32 (that is, between the two transistors connected in anti-series). The AC power supply connection unit 15 is connected, for example, to each of the first midpoint R1 and the fourth midpoint R4 of the second power conversion unit 13, the connection point between the β-phase first coil 33 (β1) and the third circuit breaker 35, and the fifth circuit breaker 39.

[0032] The rotating electric machine 16 (M) is, for example, a two-phase AC brushless DC motor. The rotating electric machine 16 includes, for example, an α-phase first coil 23 (α1), an α-phase second coil 24 (α2), a β-phase first coil 33 (β1), a β-phase second coil 34 (β2), a rotor 41, and a stator core 42. The rotor 41 includes a permanent magnet for a field. The stator core 42 has coils α1, α2, β1, and β2 attached thereto, which generate a rotating magnetic field that rotates the rotor 41.

[0033] The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), and the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are so-called open-end coils, and the ends of each coil α1, α2, β1, β2 are not connected to each other (i.e., each coil α1, α2, β1, β2 is disconnected from each other) and are drawn out to the outside of the rotating electric machine 16.

[0034] The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) are, for example, arranged so that the spatial phase difference between them is zero, and are wound in the same direction around different teeth of the stator core 42 when viewed from the axial direction along the central axis of the rotating electric machine 16 (M). The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) are, for example, arranged so as to share a part of a slot 43 formed in the stator core 42, and are magnetically coupled to each other with the same polarity. The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) have, for example, zero spatial phase difference therebetween and are wound in the same direction around different teeth of the stator core 42 when viewed from the axial direction along the central axis of the rotating electric machine 16 (M). The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are, for example, arranged so as to share a part of a slot 43 formed in the stator core 42, and are magnetically coupled to each other with the same polarity.

[0035] The α-phase first coil 23 (α1) and α-phase second coil 24 (α2) and the β-phase first coil 33 (β1) and β-phase second coil 34 (β2) are arranged so as not to magnetically interfere with each other by making the spatial phase difference between them 90°. For example, the coils α1, α2, β1, and β2 are attached to the stator core 42 by concentrated winding or distributed winding, and the number of turns of the coils α1, α2, β1, and β2 is the same.

[0036] The rotating electric machine 16(M) generates rotational power by performing power running operation using electric power supplied from the first electric power conversion unit 12 and the second electric power conversion unit 13. When the rotating electric machine 16(M) is connected to the wheels of a vehicle, for example, it generates driving force for traveling using electric power supplied from the first electric power conversion unit 12 and the second electric power conversion unit 13. The rotating electric machine 16(M) may generate power by performing regenerative operation using rotational power input from the wheels of the vehicle. When the rotating electric machine 16(M) is connected to the internal combustion engine of the vehicle, for example, it may generate power using the power of the internal combustion engine.

[0037] The gate drive unit 17 switches on (conducting) and off (disconnecting) each of the switching elements of the first power conversion unit 12 and the second power conversion unit 13 and each of the disconnectors 25, 26, 35, 36, and 39 based on a control signal received from the electronic control unit 18. For example, the gate drive unit 17 switches on (conducting) and off (disconnecting) each of the switching elements of the full bridge circuits 12a, 12b, 13a, and 13b by outputting a gate signal generated by amplifying and level-shifting a control signal.

[0038] The electronic control unit 18 comprehensively controls the operations of the power control unit 10a and the rotating electric machine 16(M). For example, the electronic control unit 18 is a software function unit that functions when a processor such as a CPU (Central Processing Unit) executes a predetermined program. The software function unit is an ECU (Electronic Control Unit) that includes a processor such as a CPU, a ROM (Read Only Memory) that stores programs, a RAM (Random Access Memory) that temporarily stores data, and electronic circuits such as a timer. At least a part of the electronic control unit 18 may be an integrated circuit such as an LSI (Large Scale Integration).

[0039] The electronic control unit 18 generates control signals that indicate the timing to turn on (conducting) and off (disconnecting) each of the switching elements of the first power conversion unit 12 and the second power conversion unit 13 and each of the disconnectors 25, 26, 35, 36, 39. The electronic control unit 18 inputs the generated control signals to the gate drive unit 17.

[0040] The electric device 10 includes, for example, a motor temperature sensor 40a and a battery temperature sensor 40b. The motor temperature sensor 40a detects, for example, the temperature of the stator core 42 of the rotating electric machine 16(M), the temperatures of the coils α1, α2, β1, β2, or the temperature of the refrigerant in the cooling circuit. The battery temperature sensor 40b detects, for example, the temperature of each battery cell of the power storage device 11. Signals of the detected values ​​(motor temperature and battery temperature) output from the motor temperature sensor 40a and the battery temperature sensor 40b are input to the electronic control unit 18.

[0041] (Control operation of electrical equipment) When the rotating electric machine 16 (M) is in power running or regenerative operation, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an on (conducting) state. By switching the first switch 22 and the second switch 32 between on (conducting) and off (disconnecting), the electronic control unit 18 switches between a series connection of the α-phase coils α1, α2 and a series connection of the β-phase coils β1, β2, and a parallel connection of the α-phase coils α1, α2 and a parallel connection of the β-phase coils β1, β2. The electronic control unit 18 performs, for example, current feedback control using a current detection value of the rotating electric machine 16(M) and a current target value corresponding to a torque command value of the rotating electric machine 16(M), and generates a control signal that instructs the driving of each switching element of the first power conversion unit 12 and the second power conversion unit 13.

[0042] During DC charging, that is, when the power storage device 11 is charged by an external DC power supply connected to the DC power supply connection unit 14, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an on (conductive) state. For example, with respect to an external DC power supply having a lower voltage than the power storage device 11, the electronic control unit 18 causes each of the combination of the α-phase coils α1, α2 and the first power conversion unit 12 and the combination of the β-phase coils β1, β2 and the second power conversion unit 13 to function as a non-insulated DC-DC converter that performs a boost operation using so-called chopper control.

[0043] During AC charging, i.e., when charging the power storage device 11 using an external AC power source connected to the AC power source connection portion 15, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an OFF (disconnected) state for insulation. The electronic control unit 18, for example, sets the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), which are magnetically coupled to each other with the same polarity, as a coil of a DC conversion phase (α-phase) used for conversion between DC powers. The electronic control unit 18, for example, causes the combination of the α-phase coils α1, α2 and the first power conversion unit 12 to function as a DAB (Dual Active Bridge) DC-DC converter, which is an insulated bidirectional (step-up and step-down) converter.

[0044] The electronic control unit 18, for example, configures the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2), which are magnetically coupled to each other with the same polarity, as the coils of the AC input phase (β-phase) connected to the external AC power supply. The electronic control unit 18, for example, causes the combination of the β-phase coils β1 and β2 and the second power conversion unit 13 to function as a so-called full-bridgeless (or bridgeless and totem-pole) power factor correction (PFC) circuit that converts AC power to DC power. The so-called bridgeless PFC is a PFC that does not include a bridge rectifier made up of multiple bridge-connected diodes, while the so-called totem-pole PFC is a PFC that includes a pair of switching elements of the same conductivity type connected in series in the same direction (totem-pole connection). The electronic control unit 18, for example, controls the switching of each switching element in each full bridge circuit 13a, 13b of the second power conversion unit 13, thereby rectifying and boosting the AC power received from the external AC power source to DC power and improving the power factor of the input voltage Vac and the input current Iac.

[0045] For example, when the electrical equipment 10 is started, the electronic control unit 18 heats the storage device 11 and the rotating electric machine 16(M) by returning a high-frequency current based on the power output from the storage device 11 to each of the first power conversion unit 12 and the second power conversion unit 13. The electronic control unit 18 heats the power storage device 11 and the rotating electrical machine 16(M) by controlling the energization of each of the coils α1, α2, β1, and β2 in accordance with, for example, signals of detected values ​​(motor temperature and battery temperature) output from the motor temperature sensor 40a and the battery temperature sensor 40b, respectively. The electronic control unit 18 switches between, for example, a first mode in which the amount of heat generated by the power storage device 11 is greater than the amount of heat generated by the rotating electrical machine 16(M), and a second mode in which the amount of heat generated by the power storage device 11 is smaller than the amount of heat generated by the power storage device 11 in the first mode.

[0046] Fig. 3 is a flowchart showing the operation of the electric device 10 of the embodiment. Fig. 4 is a circuit diagram showing the flow of current in the first mode of the electric device 10 of the embodiment. Fig. 5 is a diagram showing changes in current flowing through the coils α1, α2, β1, β2 and the power storage device 11 in the first mode of the electric device 10 of the embodiment. Fig. 6 is a circuit diagram showing the flow of current in the second mode of the electric device 10 of the embodiment. Fig. 7 is a diagram showing changes in current flowing through the coils α1, α2, β1, β2 and the power storage device 11 in the second mode of the electric device 10 of the embodiment. 3, the electronic control unit 18 determines whether or not there is a heating command to heat the power storage device 11 and the rotating electrical machine 16(M) using the power of the power storage device 11. If the result of this determination is "NO", the electronic control unit 18 proceeds to end the process. On the other hand, if the result of this determination is "YES", the electronic control unit 18 proceeds to step S02.

[0047] Next, in step S02, the electronic control unit 18 executes a first mode in which the heat generation amount of the power storage device 11 is greater than the heat generation amount of the rotating electric machine 16 (M). For example, as shown in FIG. 4, in the first mode, the first switch 22 and the second switch 32 are set to an OFF (disconnected) state, and the first switch 25, the second switch 26, the third switch 35, and the fourth switch 36 are set to an ON (conducting) state. As shown in FIGS. 4 and 5, in the first mode, the switching phases of the first full-bridge circuit 12a and the second full-bridge circuit 12b of the first power conversion unit 12 are set to opposite phases, and the switching phases of the third full-bridge circuit 13a and the fourth full-bridge circuit 13b of the second power conversion unit 13 are set to opposite phases. The phase difference between the switching phase of the first power conversion unit 12 and the switching phase of the second power conversion unit 13 is zero.

[0048] In the first mode, currents flow in opposite directions through the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2). The currents flowing through the α-phase coils 23 (α1) and 24 (α2) are currents of opposite phases, causing their magnetic fluxes to cancel each other out. Because the magnetic fluxes of the α-phase coils 23 (α1) and 24 (α2) cancel each other out, the inductance of each α-phase coil 23 (α1) and 24 (α2) is leakage inductance due to leakage magnetic flux. In the first mode, currents flow in opposite directions through the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2). The currents flowing through the β-phase coils 33 (β1) and 34 (β2) are currents of opposite phases, so that the magnetic fluxes of the currents cancel each other out. Because the magnetic fluxes of the β-phase coils 33 (β1) and 34 (β2) cancel each other out, the inductance of the β-phase coils 33 (β1) and 34 (β2) is leakage inductance due to leakage magnetic flux.

[0049] In the first mode, the inductance of each of the coils α1, α2, β1, and β2 is small, so that iron loss is small, and the rotating electrical machine 16(M) is heated almost entirely by copper loss. In the first mode, the frequency of the current flowing through the power storage device 11 is twice the frequency of the current flowing through each of the coils α1, α2, β1, and β2. In the first mode, the ripple of the current flowing through the power storage device 11 is relatively large compared to the second mode described later, which promotes heating of the power storage device 11.

[0050] 3, the electronic control unit 18 determines whether the battery temperature acquired from the battery temperature sensor 40b is equal to or higher than a predetermined first temperature. If the result of this determination is "NO," the electronic control unit 18 repeatedly executes the process of step S02. On the other hand, if the result of this determination is "YES," the electronic control unit 18 proceeds to step S04.

[0051] Next, in step S04, the electronic control unit 18 executes a second mode in which the amount of heat generated by the power storage device 11 is smaller than the amount of heat generated by the power storage device 11 in the first mode. For example, as shown in FIG. 6 , in the second mode, similarly to the first mode, the first switch 22 and the second switch 32 are set to an OFF (disconnected) state, and the first switch 25, the second switch 26, the third switch 35, and the fourth switch 36 are set to an ON (conducting) state. As shown in FIGS. 6 and 7 , in the second mode, the switching phases of the first full-bridge circuit 12a and the second full-bridge circuit 12b of the first power conversion unit 12 are in phase, and the switching phases of the third full-bridge circuit 13a and the fourth full-bridge circuit 13b of the second power conversion unit 13 are in phase. The phase difference between the switching phase of the first power conversion unit 12 and the switching phase of the second power conversion unit 13 is 180°.

[0052] In the second mode, currents flow in the same direction through the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2). The currents flowing through the α-phase coils 23 (α1) and 24 (α2) are in-phase currents whose magnetic fluxes do not cancel each other out. Because the magnetic fluxes of the α-phase coils 23 (α1) and 24 (α2) do not cancel each other out, the inductance of each α-phase coil 23 (α1) and 24 (α2) is relatively large compared to the first mode. In the second mode, currents flow in the same direction through the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2). The currents flowing through the β-phase coils 33 (β1) and 34 (β2) are in-phase currents whose magnetic fluxes do not cancel each other out. Because the magnetic fluxes of the β-phase coils 33 (β1) and 34 (β2) do not cancel each other out, the inductance of the β-phase coils 33 (β1) and 34 (β2) is relatively large compared to the first mode.

[0053] In the second mode, the inductance of each of the coils α1, α2, β1, and β2 is relatively large compared to the first mode, and the rotating electrical machine 16(M) is heated by iron loss and copper loss. The frequency of the current flowing through the power storage device 11 in the second mode is twice the frequency of the current flowing through each of the coils α1, α2, β1, and β2. The magnitude of the current flowing through the power storage device 11 in the second mode (Ib2) is relatively small compared to the magnitude of the current flowing through the power storage device 11 in the first mode (Ib1). In the second mode, the ripple of the current flowing through the power storage device 11 is relatively small compared to the first mode, and the heat retention of the power storage device 11 is maintained.

[0054] 3, the electronic control unit 18 determines whether the motor temperature acquired from the motor temperature sensor 40a is equal to or higher than a predetermined second temperature. If the determination result is "NO," the electronic control unit 18 repeatedly executes the process of step S04. On the other hand, if the determination result is "YES," the electronic control unit 18 advances the process to the end.

[0055] As described above, according to the embodiment of the electrical equipment 10, by switching between the first mode and the second mode depending on the respective temperatures of the storage device 11 and the rotating electric machine 16(M), it is possible to appropriately control the respective temperatures of the storage device 11 and the rotating electric machine 16(M) even when, for example, there is a large difference between the temperature of the storage device 11 and the temperature of the rotating electric machine 16(M). By switching between the opposite phase and the same phase of the switching phase, it is possible to reciprocally switch between the magnitude of iron loss according to the inductance and the magnitude of current or current ripple according to the inductance. For example, it is possible to easily adjust the relative amount of heating of the electricity storage device 11 due to the current ripple or current and the heating of the rotating electrical machine 16(M) due to iron loss, thereby saving power.

[0056] (Variation) Modifications of the embodiment will be described below. Note that the same parts as those in the above-described embodiment will be denoted by the same reference numerals, and descriptions thereof will be omitted or simplified. In the above-described embodiment, in the first mode, the phase difference between the switching phase in the first power conversion unit 12 and the switching phase in the second power conversion unit 13 is zero, but this is not limiting. For example, the phase difference between the switching phase in the first power conversion unit 12 and the switching phase in the second power conversion unit 13 may be set to 90°. FIG. 8 is a diagram showing changes in current flowing through the coils α1, α2, β1, β2 and the power storage device 11 in the first mode in the electric device 10 of the first modified example of the embodiment. 8, the frequency of the current flowing through power storage device 11 in the first mode of the first modified example is twice the frequency of the current flowing through power storage device 11 in the first mode of the above-described embodiment. The magnitude (Ib1 / 2) of the current flowing through power storage device 11 in the first mode of the first modified example is half the magnitude (Ib1) of the current flowing through power storage device 11 in the first mode of the above-described embodiment. According to the first modification, the magnitude of the current flowing through the power storage device 11 can be reduced, and the relative amounts of heating of the power storage device 11 and the rotating electrical machine 16(M) can be adjusted in more detail.

[0057] In the above-described embodiment, in the second mode, the phase difference between the switching phase in the first power conversion unit 12 and the switching phase in the second power conversion unit 13 is 180°, but this is not limiting. For example, the phase difference between the switching phase in the first power conversion unit 12 and the switching phase in the second power conversion unit 13 may be set to 90°.

[0058] In the above-described embodiment, the electronic control unit 18 switches between the first mode and the second mode, but this is not limiting. For example, the electronic control unit 18 may switch between the first mode and a third mode (i.e., instead of the second mode) in which the amount of heat generated by the power storage device 11 is smaller than the amount of heat generated by the power storage device 11 in the first mode. Fig. 9 is a flowchart showing the operation of the electric device 10 according to the second modified example of the embodiment. Fig. 10 is a circuit diagram showing the flow of current in the third mode in the electric device 10 according to the second modified example of the embodiment. Fig. 11 is a diagram showing changes in the current flowing through the α-phase second coil 24 (α2) and the power storage device 11 in the third mode in the electric device 10 according to the embodiment. 9, the electronic control unit 18 determines whether or not there is a heating command to heat the power storage device 11 and the rotating electrical machine 16(M) using the power of the power storage device 11. If the result of this determination is "NO", the electronic control unit 18 proceeds to end the process. On the other hand, if the result of this determination is "YES", the electronic control unit 18 proceeds to step S12.

[0059] Next, in step S12, the electronic control unit 18 executes the first mode in which the amount of heat generated by the power storage device 11 is greater than the amount of heat generated by the rotating electrical machine 16(M), similarly to step S02 in the above-described embodiment. Next, in step S13, the electronic control unit 18 determines whether the battery temperature acquired from the battery temperature sensor 40b is equal to or higher than a predetermined first temperature. If the result of this determination is "NO", the electronic control unit 18 repeatedly executes the process of step S12. On the other hand, if the result of this determination is "YES", the electronic control unit 18 proceeds to step S14.

[0060] Next, in step S14, the electronic control unit 18 executes a third mode in which the amount of heat generated by the power storage device 11 is smaller than the amount of heat generated by the power storage device 11 in the first mode. For example, as shown in FIG. 10, in the third mode, conversion between DC and DC power is performed by the first power conversion unit 12. For example, in the third mode, the first switch 25 is set to an OFF (disconnected) state, and the first switch 22 and the second switch 26 are set to an ON (conductive) state. In the third mode, the two element units 21a (a4H) and 21b (a4L) of the second full-bridge circuit 12b that forms the fourth leg of the first power conversion unit 12 are alternately switched ON and OFF.

[0061] For example, in the third mode, the duty corresponding to the ON (conduction) state of the element unit 21a (a4H) of the high-side arm is changed while the voltage of the capacitor (capacitor) 37 is kept below the withstand voltage of each of the element units 21a (a4H) and 21b (a4L). For example, as the duty corresponding to the ON (conduction) state of the element unit 21a (a4H) increases, the voltage of the capacitor (capacitor) 37 and the current flowing through the α-phase second coil 24 (α2) increase. 11, the frequency of the current flowing through the power storage device 11 in the third mode is the same as the frequency of the current flowing through the α-phase second coil 24 (α2). The magnitude (Ib3) of the current flowing through the power storage device 11 in the third mode is relatively smaller than the magnitude (Ib2) of the current flowing through the power storage device 11 in the second mode.

[0062] In the third mode, the inductance of the α-phase second coil 24 (α2) is relatively large compared to the first mode, and the rotating electrical machine 16 (M) is heated by iron loss and copper loss. In the third mode, the ripple of the current flowing through the power storage device 11 is relatively small compared to the first mode, and the heat retention of the power storage device 11 is maintained.

[0063] Next, in step S15 shown in FIG. 9, the electronic control unit 18 determines whether the motor temperature acquired from the motor temperature sensor 40a is equal to or higher than a predetermined third temperature. For example, the predetermined third temperature is lower than the predetermined second temperature in the above-described embodiment. If the result of this determination is "NO," the electronic control unit 18 repeatedly executes the process of step S14. On the other hand, if the result of this determination is "YES," the electronic control unit 18 proceeds to the end of the process. According to the second modified example, in the third mode, the magnitude of the current flowing through the power storage device 11 can be reduced compared to, for example, the second mode of the above-described embodiment, and priority can be given to heating the rotating electric machine 16(M) with greater power saving.

[0064] Table 1 below shows the relative magnitude relationship between the battery current and the motor current in the above-described embodiment, modified example 1, and modified example 2. The battery current and the motor current each tend to decrease as, for example, the operation mode shifts sequentially from the first mode to the second mode, and from the second mode to the third mode.

[0065] [Table 1]

[0066] In the above-described embodiment, the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), and the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are each wound around different teeth of the stator core 42, but this is not limited to this. FIG. 12 is a configuration diagram of a rotating electric machine 16A of the electric device 10 in a third modified example of the embodiment. As shown in FIG. 12, the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), and the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) may each be wound around the same teeth of the stator core 42.

[0067] In the above-described embodiment, the second power conversion unit 13 includes the fifth breaker 39, but the present invention is not limited to this. For example, the second power conversion unit 13 may include, instead of the fifth circuit breaker 39, a sixth circuit breaker connected between the AC power supply connection unit 15 and the connection point between the β-phase second coil 34 (β2) and the fourth circuit breaker 36.

[0068] In the above-described embodiment, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are magnetically coupled to each other with the same polarity, but this is not limiting, and the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) may be magnetically coupled to each other with opposite polarities. In this case, for example, a disconnector may be provided connected between one end of the β-phase first coil 33 (β1) and a midpoint R2 of the second phase of the third full-bridge circuit 13a, or a disconnector may be provided between one end of the β-phase second coil 34 (β2) and a midpoint R3 of the third phase of the fourth full-bridge circuit 13b.

[0069] In the above-described embodiment, the DC power supply connection unit 14 is connected in a parallel pattern to the negative electrode of the second power conversion unit 13 and the midpoint of each of the first switch 22 and the second switch 32 (i.e., between the two transistors connected in anti-series), but this is not limiting. For example, the DC power supply connection unit 14 may be connected in a series pattern to the negative electrode of the second power conversion unit 13 and the midpoint Q4 of the first power conversion unit 12 and the midpoint R4 of the second power conversion unit 13. For example, the DC power supply connection unit 14 may be connected in another parallel pattern to the negative electrode of the second power conversion unit 13 and the midpoints Q2 and Q4 of the first power conversion unit 12 and the midpoints R2 and R4 of the second power conversion unit 13.

[0070] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0071] 10...electrical equipment, 10a...power control unit, 11...power storage device, 12...first power conversion unit, 12a...first full bridge circuit, 12b...second full bridge circuit (first full bridge circuit), 13...second power conversion unit, 13a...third full bridge circuit (second full bridge circuit), 13b...fourth full bridge circuit (second full bridge circuit), 14...DC power supply connection unit, 15...AC power supply connection unit, 16...rotating electric machine, 17...gate drive unit, 18...electronic control unit, 22...first switch (coil disconnector), 23...α phase first coil (α1) (first coil), 24...α phase second coil (α2) (first coil), 25...first circuit breaker (circuit breaker), 26...second circuit breaker (circuit breaker), 32...second switch, 33...β phase first coil (β1) (second coil), 34...β phase second coil (β2) (second coil), 35...third circuit breaker, 36...fourth circuit breaker, 39...fifth circuit breaker, 40a...motor temperature sensor (second temperature acquisition unit), 40b...battery temperature sensor (first temperature acquisition unit), 41...rotor, 42...stator core, 43...slot.

Claims

1. a power storage device; a rotating electric machine having a plurality of coils; a power control unit connected to the power storage device and the rotating electric machine, the power control unit controlling power exchange between the power storage device and the rotating electric machine; a first temperature acquisition unit that acquires a temperature of the power storage device; a second temperature acquisition unit that acquires the temperature of the rotating electrical machine; Equipped with The power control unit By controlling the energization of the plurality of coils in accordance with the temperatures acquired by the first temperature acquisition unit and the second temperature acquisition unit, the system switches between a first mode in which the heat generation amount of the power storage device is greater than the heat generation amount of the rotating electrical machine and a second mode in which the heat generation amount of the power storage device is smaller than the heat generation amount of the power storage device in the first mode. Electrical equipment.

2. The rotating electric machine includes: a stator core having slots formed therein; The plurality of coils a plurality of first coils that are magnetically coupled to each other and share slots of the stator core; a plurality of second coils that are magnetically coupled and share the slots of the stator core; The power control unit a plurality of first full-bridge circuits connected to the plurality of first coils; a plurality of second full-bridge circuits connected to the plurality of second coils, In the first mode, the switching phases of the first full-bridge circuits and the second full-bridge circuits are opposite to each other; In the second mode, the switching phases of the first full-bridge circuits and the second full-bridge circuits are in phase. The electrical device according to claim 1 .

3. the spatial phases of the first coils and the second coils are orthogonal to each other; the plurality of first coils and the plurality of second coils are open-ended, The power control unit A phase difference between a switching phase of the plurality of first full-bridge circuits and a switching phase of the plurality of second full-bridge circuits is set to 90° in accordance with the temperatures acquired by the first temperature acquisition unit and the second temperature acquisition unit. The electrical device according to claim 2.

4. The rotating electric machine includes: a stator core having slots formed therein; The plurality of coils a plurality of first coils that are magnetically coupled to each other and share slots of the stator core; a plurality of second coils that are magnetically coupled and share the slots of the stator core; The power control unit a plurality of first full-bridge circuits connected to the plurality of first coils; a coil disconnector connected between the plurality of first coils; two disconnectors connected between the positive electrodes and between the negative electrodes of the plurality of first full bridge circuits; a plurality of second full-bridge circuits connected to the plurality of second coils, In the first mode, the switching phases of the first full-bridge circuits and the second full-bridge circuits are opposite to each other; In the second mode, the inter-coil disconnector is set to a connected state, and a first of the two disconnectors is set to a disconnected state and a second of the two disconnectors is set to a connected state, thereby performing conversion between DC powers by the plurality of first full-bridge circuits. The electrical device according to claim 1 .

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