Electric device

Abstract

To provide an electric device capable of ensuring a desired switching frequency required for various types of an AC charging and improving efficiency.SOLUTION: An electric device 10 includes: a power control unit 10a; and a secondary coil 51. The power control unit 10a includes: a third full bridge circuit 13a and a fourth full bridge circuit 13b connected to both ends of each of the β phase coils β1 and β2, and a third disconnector 35 and a fourth disconnector 36 connected between each one end of each of the β phase coils β1 and β2 and each of the full bridge circuits 13a and 13b. Both ends of the secondary coil 51 are connected to a first leg and a second leg of the third full bridge circuit 13a and a third leg and a fourth leg of the fourth full bridge circuit 13b. When the secondary side coil 51 receives a power transmitted in a non-contact manner, the power control unit 10a operates a switching operation of the first leg or the second leg and the switching operation of the third leg or the fourth leg by interleaving.SELECTED DRAWING: Figure 3

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. Conventionally, for example, a power supply system is known that switches a multi-phase bridge circuit using switching elements to a converter connected to a fuel cell or a converter connected to a power receiving unit of a contactless power transmission system (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-110654 Summary of the Invention [Problem to be solved by the invention]

[0004] In technologies related to charging and supplying power to mobility vehicles equipped with secondary batteries, improving the efficiency of contactless power transmission from an external power source is an issue. For example, when a bridge circuit using switching elements is connected to a power receiving unit, as in the power supply system of the above-mentioned prior art, it becomes necessary to increase the switching frequency of the bridge circuit to the resonant frequency of the coil of the power receiving unit. However, if the bridge circuit connected to the fuel cell is not designed for high-frequency switching, there is a risk that the desired switching frequency and transmission efficiency cannot be ensured when the bridge circuit is also used for contactless power transmission.

[0005] In order to solve the above problems, the present application aims to ensure a desired switching frequency required for various AC charging methods and achieve improved efficiency, thereby contributing to improved 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, an electric device 10 in the embodiment) includes a power receiving coil (for example, a secondary coil 51 in the embodiment) that receives power transmitted contactlessly from a power transmitting coil, a power storage device (for example, a power storage device 11 in the embodiment), a rotating electric machine (for example, a rotating electric machine 16(M) in the embodiment) that includes 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), and a power receiving coil, the power storage device, and the rotating electric machine. and a power control unit (for example, power control unit 10a in the embodiment) that controls the power transfer between the power receiving side coil, the power storage device, and the rotating electric machine, and the power control unit includes at least one first coil (for example, β-phase first coil 33 (β1) in the embodiment) of the plurality of coils and at least one pair of a first leg (for example, element unit 31a (b1H) and element unit 31b (b1L) in the embodiment) and a second leg (for example, element unit 31a (b2H) and element unit at least one second coil (e.g., β-phase first coil 33(β1) in the embodiment) among the plurality of coils, at least one set of a third leg (e.g., element unit 31a(b3H) and element unit 31b(b3L) in the embodiment) and a fourth leg (e.g., element unit 31a(b4H) and element unit 31b(b4L) in the embodiment) connected to a second end of the power receiving side coil, and a first circuit breaker (e.g., third circuit breaker 35 in the embodiment) connected between one end of the first coil and the first leg or the second leg; a second circuit breaker (for example, a fourth circuit breaker 36 in the embodiment) connected between one end of the second coil and the third leg or the fourth leg; a third circuit breaker (for example, a first power receiving unit circuit breaker 61 in the embodiment) connected between the first end of the power receiving side coil and the first leg and between the first end of the power receiving side coil and the second leg; and a fourth circuit breaker (for example, a second power receiving unit circuit breaker 62 in the embodiment) connected between the second end of the power receiving side coil and the third leg and between the second end of the power receiving side coil and the fourth leg,When the power receiving side coil receives power transmitted contactlessly from the power transmitting side coil, the switching operation of the first leg or the second leg and the switching operation of the third leg or the fourth leg are performed in an interleaved manner.

[0007] (2): In the electrical device described in (1) above, the first coil and the second coil may be open-ended, and both ends of the first coil may be connected between the first leg and the second leg, and both ends of the second coil may be connected between the third leg and the fourth leg.

[0008] (3): In the electric device described in (1) or (2) above, the rotating electric machine includes a stator core (e.g., stator core 42 in the embodiment) in which a slot (e.g., slot 43 in the embodiment) shared by the magnetically coupled first coil and the second coil is formed, and at least one third coil (e.g., α-phase first coil 23 (α1) in the embodiment) and at least one fourth coil (e.g., α-phase second coil 24 (α2) in the embodiment) are magnetically coupled and share the slot (e.g., slot 43 in the embodiment) of the stator core among the plurality of coils, and the power control unit controls a first full bridge circuit (e.g., third full bridge circuit 13a in the embodiment) formed by the first leg and the second leg, and a second full bridge circuit (e.g., fourth full bridge circuit a third full bridge circuit (for example, a first full bridge circuit 12a in the embodiments) connected to both ends of the third coil; a fourth full bridge circuit (for example, a second full bridge circuit 12b in the embodiments) connected to both ends of the fourth coil; a fifth switch (for example, a first switch 25 in the embodiments) connected between the positive electrodes of the third full bridge circuit and the fourth full bridge circuit; and a sixth switch (for example, a second switch 26 in the embodiments) connected between the negative electrodes of the third full bridge circuit and the fourth full bridge circuit, wherein the first full bridge circuit and the second full bridge circuit form an AC input phase (for example, a β phase in the embodiments) that converts input AC power into DC power, and the third full bridge circuit and the fourth full bridge circuit form a DC conversion phase (for example, an α phase in the embodiments) that converts DC power.

[0009] (4): In the electrical device described in (3) above, the power control unit and at least one of the plurality of coils may be connected to an external power source (e.g., an external DC power source or an external AC power source in the embodiments), and at least one of the connection points with the power control unit may be a power source connection member (e.g., a DC power source connection portion 14 or an AC power source connection portion 15 in the embodiments) that is common to the power receiving coil. [Effects of the Invention]

[0010] According to the above (1), the effective switching frequency can be increased by interleaving the switching operation of the first leg or the second leg connected to the first end of the power receiving coil and the switching operation of the third leg or the fourth leg connected to the second end of the power receiving coil. For example, the switching frequency for the power receiving coil can be doubled by the switching frequency of the first leg and the second leg and the switching frequency of the third leg and the fourth leg. For example, even if the power control unit is not designed to perform high-frequency switching, the switching frequency can be easily increased to the resonant frequency of the power receiving coil.

[0011] In the case of (2) above, since the first and second coils are open-ended, the first and second legs and the third and fourth legs can be shared with the power receiving coil, thereby suppressing an increase in the number of parts. Also, compared to a case where the first and second coils are not open-ended, the voltage applied to each coil can be made larger relative to the charging voltage, thereby increasing the charging speed.

[0012] In the case of (3) above, the combination of an AC input phase that converts input AC power into DC power and a DC conversion phase that converts between DC and DC power allows the energy storage device to be properly charged by the external power supply. For example, if the third full-bridge circuit and the fourth full-bridge circuit function as an isolated bidirectional DC-DC converter, the boost operation allows for rapid charging of the energy storage device at a voltage higher than the charging voltage from the external power supply.

[0013] In the case of (4) above, the first and second circuit breakers can be shared for charging the power storage device by both the external power supply and the power receiving coil, and an increase in the number of parts can be suppressed. [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] FIG. 1 is a diagram showing a partial configuration of an electrical device according to an embodiment of the present invention. [Figure 4] FIG. 10 is a diagram showing a partial configuration of an electric device according to a first modified example of the embodiment of the present invention. [Figure 5] FIG. 10 is a configuration diagram of a rotating electric machine as an electric device according to a second 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 combined 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) or a power transmission device.

[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] FIG. 3 is a diagram showing a partial configuration of the electrical device 10 according to the embodiment. 1 and 3, the electric device 10 includes a power receiving unit 50 that receives power transmitted wirelessly from an external power transmitting device. The power receiving unit 50 receives power by changes in the high-frequency magnetic field transmitted from the power transmitting device, for example, through magnetic field coupling such as magnetic resonance or electromagnetic induction. The power receiving unit 50 includes a resonant circuit formed by a secondary coil 51, a secondary resistor 52, and a secondary capacitor 53 that are connected in series.

[0041] The electric device 10 includes, for example, a first power receiving unit disconnector 61 and a second power receiving unit disconnector 62 connected between both ends of the secondary side coil 51 and the second power conversion unit 13. The first power receiving unit disconnector 61 is connected, for example, between a first end of the secondary side coil 51 and a midpoint R1 of the element unit 31a (b1H) and the element unit 31b (b1L) that form the first leg of the second power conversion unit 13, and a midpoint R2 of the element unit 31a (b2H) and the element unit 31b (b2L) that form the second leg of the second power conversion unit 13. The first power receiving unit disconnector 61 includes, for example, two disconnectors 61a, that is, a disconnector 61a connected between the first end of the secondary side coil 51 and the midpoint R1, and a disconnector 61a connected between the first end of the secondary side coil 51 and the midpoint R2. The second power receiving unit disconnector 62 is connected, for example, between a second end of the secondary side coil 51 and a midpoint R3 of the element unit 31a (b3H) and the element unit 31b (b3L) that form the third leg of the second power conversion unit 13, and a midpoint R4 of the element unit 31a (b4H) and the element unit 31b (b4L) that form the fourth leg of the second power conversion unit 13. The second power receiving unit disconnector 62 includes, for example, two disconnectors 62a, that is, a disconnector 62a that is connected between the second end of the secondary side coil 51 and the midpoint R3, and a disconnector 62a that is connected between the second end of the secondary side coil 51 and the midpoint R4.

[0042] (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.

[0043] 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.

[0044] 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, or during non-contact charging as described below, 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.

[0045] 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.

[0046] During contactless charging, that is, when charging power storage device 11 using power receiving unit 50 that receives power contactlessly transmitted from an external power transmitting device, electronic control unit 18 causes a combination of the first or second leg of second power conversion unit 13, the third or fourth leg of second power conversion unit 13, and power receiving unit 50 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. Electronic control unit 18 sets, for example, one of two disconnectors 61a of first power receiving unit disconnector 61 and one of two disconnectors 62a of second power receiving unit disconnector 62 to an on (conductive) state, and sets second switch 32, third disconnector 35, and fourth disconnector 36 to an off (disconnected) state. For example, the electronic control unit 18 causes the switching operation of the first leg or the second leg and the switching operation of the third leg or the fourth leg to be interleaved, that is, alternately operated with a phase difference of 180°.

[0047] As described above, according to the electric device 10 of the embodiment, the effective switching frequency can be increased by interleaving the switching operation of the first leg or the second leg of the second power conversion unit 13 and the switching operation of the third leg or the fourth leg of the second power conversion unit 13. For example, the switching frequency of the secondary coil 51 can be doubled by the switching frequency of the third full-bridge circuit 13a and the switching frequency of the fourth full-bridge circuit 13b. For example, even if high-frequency switching is not expected in the power control unit 10a, the switching frequency can be easily increased to the resonant frequency of the secondary coil 51.

[0048] Because each of the β-phase coils β1, β2 is open-ended, the first and second legs of the second power conversion unit 13 and the third and fourth legs of the second power conversion unit 13 can be used in common as the secondary coil 51, thereby suppressing an increase in the number of parts. Furthermore, compared to a case where the coils are not open-ended, for example, the voltage applied to each of the β-phase coils β1, β2 can be made larger relative to the charging voltage, thereby increasing the charging speed.

[0049] By combining an AC input phase (β phase) that converts input AC power into DC power and a DC conversion phase (α phase) that converts between DC powers, it is possible to properly charge the power storage device 11 from an external AC power source. For example, when the first power conversion unit 12 is made to function as an insulated bidirectional DC-DC converter, it is possible to quickly charge the power storage device 11 to a voltage that is higher than the charging voltage from the external AC power source by the boost operation.

[0050] When at least one of the connection points between the power control unit 10a and the DC power supply connection portion 14 and the AC power supply connection portion 15 is common to the secondary coil 51, the third circuit breaker 35 and the fourth circuit breaker 36 can be shared for charging the storage device 11 by the external power supply and the secondary coil 51, respectively, thereby preventing an increase in the number of parts.

[0051] (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, the electric device 10 includes one first power conversion unit 12 and one second power conversion unit 13 corresponding to the two-phase rotating electric machine 16(M), but is not limited to this. For example, the electric device 10 may include three or more power conversion units corresponding to the multi-phase rotating electric machine 16 having three or more phases. For example, each of the multiple power conversion units includes at least one full-bridge circuit. FIG. 4 is a diagram showing a partial configuration of an electric device 10A according to a first modified example of the embodiment. As shown in FIG. 4, the electrical device 10A in the first modified example includes, for example, one first power conversion unit 12(U) corresponding to the U phase, one second power conversion unit 13(V) corresponding to the V phase, and one second power conversion unit 13(W) corresponding to the W phase, corresponding to the three phases U, V, and W.

[0052] For example, in the first modified example, a first end of the secondary side coil 51 is connected to midpoints R1, R2, R3, and R4 of the first, second, third, and fourth legs of the second power conversion unit 13(V) via a first power receiving unit disconnector 61. The first power receiving unit disconnector 61 in the first modified example includes, for example, four disconnectors 61a connected between the first end of the secondary side coil 51 and the midpoints R1, R2, R3, and R4 of the second power conversion unit 13(V). For example, a second end of the secondary side coil 51 in the first modified example is connected to midpoints R1, R2, R3, and R4 of the first, second, third, and fourth legs of the second power conversion unit 13(W) via a second power receiving unit disconnector 62. The second power receiving unit disconnector 62 of the first modified example includes, for example, four disconnectors 62a connected between the second end of the secondary side coil 51 and each of midpoints R1, R2, R3, and R4 of the second power conversion unit 13(W). The electronic control unit 18, for example, interleaves, that is, alternately operates the switching operation of any one of the first leg, second leg, third leg, and fourth leg of the second power conversion unit 13(V) and the switching operation of any one of the first leg, second leg, third leg, and fourth leg of the second power conversion unit 13(W) with a phase difference of 180°.

[0053] 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. 5 is a configuration diagram of a rotating electric machine 16A of the electric device 10 in a second modified example of the embodiment. As shown in FIG. 5, 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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]

[0058] 10...electrical equipment, 10a...power control unit, 11...power storage device, 12...first power conversion unit, 12a...first full bridge circuit (third full bridge circuit), 12b...second full bridge circuit (fourth full bridge circuit), 13...second power conversion unit, 13a...third full bridge circuit (first full bridge circuit), 13b...fourth full bridge circuit (second full bridge circuit), 14...DC power supply connection unit ( power supply connection member), 15...AC power supply connection portion (power supply connection member), 16...rotating electric machine, 17...gate drive unit, 18...electronic control unit, 22...first switch, 23...α-phase first coil (α1) (third coil), 24...α-phase second coil (α2) (fourth coil), 25...first circuit breaker (fifth circuit breaker), 26...second circuit breaker (sixth circuit breaker), 31a (b1H)...element portion (first leg), 31b (b1L)...element unit (first leg), 31a (b2H)...element unit (second leg), 31b (b2L)...element unit (second leg), 31a (b3H)...element unit (third leg), 31b (b3L)...element unit (third leg), 31a (b4H)...element unit (fourth leg), 31b (b4L)...element unit (fourth leg), 32...second switch, 33...β-phase first coil (β1) (first coil), 34...β-phase second coil coil (β2) (second coil), 35...third circuit breaker (first circuit breaker), 36...fourth circuit breaker (second circuit breaker), 39...fifth circuit breaker (power supply circuit breaker), 41...rotor, 42...stator core, 43...slot, 50...power receiving unit, 51...secondary side coil (power receiving side coil), 52...secondary side resistor, 53...secondary side capacitor, 61...first power receiving unit circuit breaker (third circuit breaker), 62...second power receiving unit circuit breaker (fourth circuit breaker).

Claims

1. a power receiving coil that receives power transmitted contactlessly from the power transmitting coil; a power storage device; a rotating electric machine including a plurality of coils; a power control unit connected to the power receiving coil, the power storage device, and the rotating electric machine, and controlling the power exchange between the power receiving coil, the power storage device, and the rotating electric machine; Equipped with The power control unit at least one pair of a first leg and a second leg connected to at least one first coil among the plurality of coils and a first end of the power receiving side coil; at least one pair of a third leg and a fourth leg connected to at least one second coil among the plurality of coils and a second end of the power receiving side coil; a first circuit breaker connected between one end of the first coil and the first leg or the second leg; a second circuit breaker connected between one end of the second coil and the third leg or the fourth leg; a third circuit breaker connected between the first end of the power receiving side coil and the first leg and between the first end of the power receiving side coil and the second leg; a fourth breaker connected between the second end of the power receiving side coil and the third leg and between the second end of the power receiving side coil and the fourth leg; Equipped with When the power receiving side coil receives the power transmitted contactlessly from the power transmitting side coil, the switching operation of the first leg or the second leg and the switching operation of the third leg or the fourth leg are performed in an interleaved manner. Electrical equipment.

2. The first coil and the second coil are open-ended, and both ends of the first coil are connected between the first leg and the second leg, and both ends of the second coil are connected between the third leg and the fourth leg. The electrical device according to claim 1 .

3. The rotating electric machine includes: a stator core having a slot formed therein that is shared by the first coil and the second coil that are magnetically coupled; at least one third coil and at least one fourth coil among the plurality of coils that are magnetically coupled and share the slot of the stator core; Equipped with The power control unit a first full-bridge circuit formed by the first leg and the second leg; a second full-bridge circuit formed by the third leg and the fourth leg; a third full bridge circuit connected to both ends of the third coil; a fourth full bridge circuit connected to both ends of the fourth coil; a fifth breaker connected between the positive electrodes of the third full bridge circuit and the fourth full bridge circuit; a sixth breaker connected between the negative electrodes of the third full bridge circuit and the fourth full bridge circuit; Equipped with the first full-bridge circuit and the second full-bridge circuit form an AC input phase that converts input AC power into DC power; The third full-bridge circuit and the fourth full-bridge circuit form a DC conversion phase for converting DC power. The electrical device according to claim 1 or 2.

4. The power control unit and at least one of the plurality of coils are connected to an external power supply, and a power supply connection member is provided, at least one of the connection points with the power control unit being common to the power receiving coil. The electrical device according to claim 3.

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