Electric apparatus and control method for electric apparatus

Abstract

To provide an electric apparatus capable of suppressing generation of impact noise caused by vibration of a rotor during AC charge, and a control method for an electric apparatus.SOLUTION: An electric apparatus 10 comprises a power storage device 11, a rotary electric machine 16(M), a power control unit, and an angle sensor 51 which acquires a phase of a rotor of the rotary electric machine 16(M). The power control unit acquires a target DC component of a current flowing to a β-phase first coil and a β-phase second coil of the rotary electric machine 16(M) by power supplied from an external AC power source according to a stop phase of the rotor, which is acquired by the angle sensor 51 when the rotary electric machine 16(M) is stopped, and charges the power storage device 11 by a power converting operation based on the target DC component.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric device and a method for controlling the electric device. [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, there are known electric vehicles that convert AC power supplied from an external power source into DC power by, for example, combining a multi-phase stator winding of a motor with a multi-phase bridge circuit using switching elements (see, for example, Patent Documents 1 and 2). In these electric vehicles, in order to prevent torque from being generated in the motor during AC charging from an external power source, the rotor position (rotation angle) is controlled to a predetermined position when the motor is stopped. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-65808 [Patent Document 2] Patent Publication No. 2021-5944 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 suppress the generation of gear impact noise, or so-called gear rattle noise, caused by the torque generated by the motor during AC charging from an external power source. For example, when the rotor position is controlled to a predetermined position when the motor is stopped, as in the electric vehicle of the above-mentioned prior art, it may be difficult to properly control the rotor position due to factors such as the driver's intentions, the surrounding environment, and other vehicle controls. Furthermore, even when the rotor position is set to a predetermined position, vibration of the rotor occurs depending on the frequency of the charging current during AC charging, which may cause gear rattle noise in the gear connected to the rotor.

[0005] In order to solve the above problem, the present application aims to achieve suppression of the generation of impact noise caused by rotor vibration during AC charging. [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 (e.g., electric device 10 in the embodiments) according to one aspect of the present invention includes a power storage device (e.g., power storage device 11 in the embodiments), a rotating electric machine (e.g., rotating electric machine 16(M) in the embodiments) having a rotor (e.g., rotor 41 in the embodiments) and a plurality of coils (e.g., a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2) in the embodiments), a power control unit (e.g., power control unit 10a in the embodiments) connected to at least one of the plurality of coils and the power storage device to control the exchange of power between the power storage device and the rotating electric machine, and a phase acquisition unit (e.g., angle sensor 51 in the embodiments) that acquires the phase of the rotor, and the power control unit acquires a target DC component of a current flowing through the coil by power supplied from an external power source in accordance with the stop phase of the rotor acquired by the phase acquisition unit when the rotating electric machine is stopped, and charges the power storage device by power conversion operation based on the target DC component.

[0007] (2): In the electrical device described in (1) above, at least one of the plurality of coils forms an AC power supply input phase that is connected to an external AC power supply, and the electrical device includes a power supply connection member (e.g., AC power supply connection portion 15 in the embodiment) that connects the power control unit and the at least one coil to the external AC power supply, and the power control unit may change the target DC component to have an increasing tendency as the angle between the AC power supply input phase and the q axis of the rotor increases.

[0008] (3) The electric device described in (1) above may include a restriction mechanism (for example, restriction mechanism 52 in the embodiment) that restricts power transmission in the power transmission mechanism connected to the rotor.

[0009] (4): In the electrical device described in any one of (1) to (3) above, at least one of the plurality of coils may be a first phase coil (e.g., in the embodiment, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2)) that forms an AC power input phase connected to an external AC power supply, and the plurality of coils may include a plurality of second phase coils (e.g., in the embodiment, the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2)) that form DC conversion phases used for conversion between DC powers, and the power control unit may control the conversion between DC powers in combination with the plurality of second phase coils.

[0010] (5): The electric device described in (4) above includes a power supply connection member (e.g., AC power supply connection portion 15 in the embodiment) that connects the power control unit and at least one of the coils to an external AC power supply, the plurality of second-phase coils include an open-ended first coil (e.g., α-phase first coil 23 (α1) in the embodiment) and a second coil (e.g., α-phase second coil 24 (α2) in the embodiment), 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 first coil and the second coil is formed, and the power control unit includes a first full-bridge circuit (e.g., first full-bridge circuit 12a in the embodiment) connected to both ends of the first coil and a second full-bridge circuit ( For example, the power supply connection member may include a first full bridge circuit (e.g., second full bridge circuit 12b in the embodiments), at least one third full bridge circuit (e.g., third full bridge circuit 13a and fourth full bridge circuit 13b in the embodiments) connected across at least one of the first phase coils, a first circuit breaker (e.g., first circuit breaker 25 in the embodiments) connected between the positive electrodes of the first full bridge circuit and the second full bridge circuit, a second circuit breaker (e.g., second circuit breaker 26 in the embodiments) connected between the negative electrodes of the first full bridge circuit and the second full bridge circuit, and at least one third circuit breaker (e.g., third circuit breaker 35 and fourth circuit breaker 36 in the embodiments) connected between one end of at least one of the first phase coils and at least one of the third full bridge circuits, and the power supply connection member may be connected across the third circuit breaker.

[0011] (6): A method for controlling an electric device according to one aspect of the present invention includes: an electric storage device (e.g., the electric storage device 11 in the embodiment); a rotating electric machine (e.g., the rotating electric machine 16(M) in the embodiment) having a rotor (e.g., the rotor 41 in the embodiment) and a plurality of coils (e.g., a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2) in the embodiment); an electric power control unit (e.g., the electric power control unit 10a in the embodiment) connected to at least one of the plurality of coils and the electric storage device to control power transfer between the electric storage device and the rotating electric machine; and a phase acquisition unit (e.g., the angle sensor 51 in the embodiment) that acquires a phase of the rotor. 10), when power is supplied from an external AC power source to at least one of the plurality of coils and to the power storage device via the power control unit, the control method includes the steps of: acquiring a stop phase of the rotor when the rotating electric machine is stopped by the phase acquisition unit (for example, step S01 in the embodiment); acquiring a target DC component to be superimposed on a target current of a current flowing through the coil by power supplied from the external AC power source according to the stop phase of the rotor (for example, step S05 in the embodiment); and charging the power storage device by a power conversion operation based on the target current on which the target DC component is superimposed (for example, step S06 in the embodiment). [Effects of the Invention]

[0012] According to the above (1), in the stop phase in which large positive and negative torques are generated in the rotor while AC current is flowing through the coil of the rotating electric machine, the generation of impact noises such as gear rattles caused by torque pulsation can be suppressed by providing an offset to the current value. On the other hand, in the stop phase in which large positive and negative torques are not generated in the rotor, the reduction in charging efficiency can be suppressed without increasing the effective current value by not providing an offset to the current value.

[0013] In the case of (2) above, it is possible to suppress the generation of impact noises such as gear rattle noises caused by torque pulsation resulting from AC current flowing through some phases of the rotating electrical machine.

[0014] In the case of (3) above, by providing a regulating mechanism, it is possible to suppress the occurrence of rotation due to the target DC component in the power transmission mechanism connected to the rotor.

[0015] In the case of (4) above, the rectified DC voltage can be converted to charge the power storage device 11, and in the case of voltage boosting, for example, rapid charging can be performed for the voltage of the power storage device that is higher than the charging voltage from the external power source.

[0016] In the case of (5) above, when the rotating electric machine is driven by the power storage device, it can function as an inverter of a multiple full-bridge circuit. When the power storage device is being charged with AC from an external AC power source, the combination of the first and second coils of the rotating electric machine and the first and second full-bridge circuits can function as an isolated bidirectional DC-DC converter, and the combination of the first phase coil and the third full-bridge circuit can function as a rectifier circuit. For example, in the case of voltage boost operation during AC charging, rapid charging can be performed for a power storage device whose voltage is higher than the charging voltage from the external AC power source.

[0017] According to (6) above, in the stop phase in which large positive and negative torques are generated in the rotor while AC current is flowing through the coil of the rotating electric machine, the generation of impact noises such as gear rattles caused by torque pulsation can be suppressed by providing an offset to the current value. On the other hand, in the stop phase in which large positive and negative torques are not generated in the rotor, the reduction in charging efficiency can be suppressed without increasing the effective current value by not providing an offset to the current value. [Brief explanation of the drawings]

[0018] [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 graph showing an example of the correspondence relationship between the rotor phase and each of the torque amplitude and the average torque when no target DC component is superimposed during AC charging in the electric device according to the embodiment of the present invention. [Figure 5] FIG. 10 is a graph showing an example of a change in torque over time of a drive shaft in each of an embodiment of the present invention and a comparative example. [Figure 6] 4 is a flowchart showing the operation of the electrical device according to the embodiment of the present invention. [Figure 7] FIG. 10 is a configuration diagram of a rotating electric machine as an electric device according to a modified example of the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] 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.

[0020] (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.

[0021] 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).

[0022] 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 that form the high-side arm and low-side arm element units 21a and 21b of each phase. The pairs of transistors in each element unit 21a and 21b are, for example, 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.

[0023] 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.

[0024] 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.

[0025] 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).

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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).

[0032] 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).

[0033] 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).

[0034] 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, and to each of the connection points between the β-phase first coil 33 (β1) and the third circuit breaker 35 and the connection point between the β-phase second coil 34 (β2) and the fourth circuit breaker 36.

[0035] 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.

[0036] 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.

[0037] The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), for example, have zero spatial phase difference therebetween and are wound in the same direction around different teeth of the stator core 42. The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) are, for example, arranged so as to share a portion 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), for example, have zero spatial phase difference therebetween and are wound in the same direction around different teeth of the stator core 42. The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are, for example, arranged so as to share a portion of a slot 43 formed in the stator core 42, and are magnetically coupled to each other with the same polarity.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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.

[0043] FIG. 3 is a diagram showing a partial configuration of the electrical device 10 according to the embodiment. 1, 2, and 3, the electrical device 10 includes, for example, an angle sensor 51 that detects the phase (rotation angle) θ of the rotor 41 of the rotating electrical machine 16 (M), and a restriction mechanism 52 that restricts power transmission in a power transmission mechanism connected to the rotor 41. The restriction mechanism 52 is, for example, an electric parking brake and parking lock mechanism in a vehicle.

[0044] (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.

[0045] 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.

[0046] 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.

[0047] 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 coil of the AC power supply 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.

[0048] The electronic control unit 18 acquires a target DC component to be superimposed on a target charging current of the current flowing from the external AC power source to the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) based on the stop phase (stop angle) of the rotor 41 acquired by the angle sensor 51 for the rotating electric machine 16 (M) that is stopped during AC charging. The target DC component is set, for example, based on the stop phase (stop angle) of the rotor 41 and the target charging current, and prevents the average torque of the rotor 41 from becoming a value close to zero.

[0049] 4 is a graph showing an example of the correspondence relationship between the rotor phase and the torque amplitude and average torque when there is no superposition of a target DC component during AC charging in the electric device 10 of this embodiment. The torque amplitude and average torque of the rotor 41 shown in FIG. 4 correspond to a predetermined target charging current when, for example, AC charging efficiency is maximized. 4, the average torque is, for example, the average value of the torque generated in the rotor 41 when a charging current flows from an external AC power supply to each of the β-phase coils 33 (β1) and 34 (β2), and varies depending on the charging current and the stop phase of the rotor 41. For example, as shown in the first stop phase d1, the second stop phase d2, and the third stop phase d3, when the average torque is close to zero, a torque reversal occurs due to vibration of the rotor 41.

[0050] For example, when the average torque corresponding to the stopping phase (stop angle) of the rotor 41 and the target charging current becomes a value close to zero, the electronic control unit 18 superimposes a target DC component corresponding to the stopping phase (stop angle) of the rotor 41 and the target charging current, etc., on the target charging current. Fig. 5 is a graph showing an example of the change in torque of the drive shaft over time in each of the embodiment and the comparative example. The torque shown in Fig. 5 is, for example, the torque of the left and right drive shafts connected to the rotor 41 in a vehicle equipped with the electric device 10. The embodiment is a case where the target DC component is superimposed during AC charging, while the comparative example is a case where the target DC component is not superimposed during AC charging. 5, the torque in the comparative example periodically crosses zero, whereas the torque in the embodiment is set so as not to cross zero due to the superposition of the target DC component. In the embodiment, since torque reversal does not occur, even if vibration of the rotor 41 occurs, the generation of impact noise such as gear rattle noise in the power transmission mechanism connected to the rotor 41 is suppressed.

[0051] FIG. 6 is a flowchart showing the operation of the electrical device 10 according to the embodiment. First, in step S01 shown in FIG. 6, the electronic control unit 18 acquires the stop phase (stop angle) of the rotor 41 output from the angle sensor 51 when the rotating electric machine 16(M) is stopped. Next, in step S02, the electronic control unit 18 obtains a target charging current that corresponds to, for example, maximizing the efficiency of AC charging. Next, in step S03, the electronic control unit 18 acquires the average torque corresponding to the stopping phase of the rotor 41 and the target charging current based on the stopping phase of the rotor 41 and the target charging current, for example, by referring to a pre-stored average torque map. Next, in step S04, the electronic control unit 18 determines whether DC superposition is necessary based on the acquired average torque. 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 S05. Next, in step S05, the electronic control unit 18 acquires the target DC component by, for example, searching a predetermined map based on the stop phase of the rotor 41, the target charging current, and the like. Next, in step S06, electronic control unit 18 activates restriction mechanism 52 that restricts power transmission in the power transmission mechanism connected to rotor 41, and charges power storage device 11 through a power conversion operation based on the target charging current with the target DC component superimposed thereon. Then, the process proceeds to END.

[0052] As described above, according to the electric device 10 of the embodiment, in the stop phase in which large positive and negative torques are generated in the rotor 41 while AC current is flowing through the β-phase coils 33 (β1) and 34 (β2) of the rotating electric machine 16 (M), an offset is provided to the current value, thereby making it possible to suppress the generation of impact noises such as gear rattles caused by torque pulsation. On the other hand, in the stop phase in which large positive and negative torques are not generated in the rotor 41, no offset is provided to the current value, thereby making it possible to suppress a decrease in charging efficiency without increasing the effective current value.

[0053] By providing the restriction mechanism 52, it is possible to suppress the occurrence of rotation caused by the target DC component in the power transmission mechanism connected to the rotor 41. The DC voltage rectified at the AC power input phase can be converted at the DC conversion phase to charge the storage device 11. For example, in the case of boost operation, rapid charging can be performed to the voltage of the storage device 11 that is higher than the charging voltage from the external AC power source.

[0054] When the rotating electric machine 16(M) is driven by the power storage device 11, the power control unit 10a can function as an inverter of a quadruple full-bridge circuit. When the power storage device 11 is being charged with DC from an external power source, the combination of each coil of the rotating electric machine 16(M) and each full-bridge circuit can function as a non-insulated DC-DC converter. When the power storage device 11 is being charged with AC from an external power source, the combination of each α-phase coil 23(α1), 24(α2) of the rotating electric machine 16(M) with the first full-bridge circuit 12a and the second full-bridge circuit 12b can function as an insulated bidirectional DC-DC converter. The combination of each β-phase coil 33(β1), 34(β2) with the third and fourth full-bridge circuits 13a, 13b can function as a rectifier circuit. For example, in the case of a voltage boost operation during AC charging, rapid charging can be performed for the voltage of the power storage device 11 that is higher than the charging voltage from the external power source.

[0055] (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 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. 7 is a configuration diagram of a rotating electric machine 16A of the electric device 10 according to a modification of the embodiment. As shown in FIG. 7, 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.

[0056] In the above-described embodiment, the electronic control unit 18 may change the target DC component so that it tends to increase as the angle between the AC power supply input phase and the q axis of the rotor 41 increases, for example.

[0057] 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.

[0058] In the above-described embodiment, current flows from the external AC power supply to the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) during AC charging, but this is not limited to this. For example, at least one of a circuit breaker that switches on (conduction) and off (disconnection) of the connection between the AC power supply connection unit 15 and the β-phase first coil 33 (β1) and a circuit breaker that switches on (conduction) and off (disconnection) of the connection between the AC power supply connection unit 15 and the β-phase second coil 34 (β2) may be provided. In this case, the current may be set to flow only through the β-phase first coil 33 (β1) or the β-phase second coil 34 (β2).

[0059] 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.

[0060] 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]

[0061] 10...electrical equipment, 10a...power control unit, 11...electrical storage device, 12...first power conversion section, 12a...first full bridge circuit, 12b...second full bridge circuit, 13...second power conversion section, 13a...third full bridge circuit, 13b...fourth full bridge circuit (third full bridge circuit), 14...DC power supply connection section, 15...AC power supply connection section (power supply connection member), 16...rotating electric machine, 17...gate drive unit, 18...electronic control unit, 22...first switch, 23...α-phase first coil (α 1) (second phase coil, first coil), 24...α phase second coil (α2) (second phase coil, second coil), 25...first circuit breaker, 26...second circuit breaker, 32...second switch, 33...β phase first coil (β1) (coil, first phase coil), 34...β phase second coil (β2) (coil, first phase coil), 35...third circuit breaker, 36...fourth circuit breaker (third circuit breaker), 39...fifth circuit breaker, 41...rotor, 42...stator core, 43...slot, 51...angle sensor (phase acquisition unit), 52...regulating mechanism.

Claims

1. a power storage device; a rotating electric machine having a rotor and a plurality of coils; a power control unit connected to at least one of the coils and the power storage device, the power control unit controlling power exchange between the power storage device and the rotating electric machine; a phase acquisition unit that acquires the phase of the rotor; Equipped with The power control unit A target DC component of the current flowing through the coil is obtained by power supplied from an external power source in accordance with the stop phase of the rotor obtained by the phase obtaining unit when the rotating electric machine is stopped, and the power storage device is charged by a power conversion operation based on the target DC component. Electrical equipment.

2. At least one of the plurality of coils forms an AC power supply input phase that is connected to an external AC power supply, a power supply connection member that connects the power control unit and the at least one coil to the external AC power supply; The power control unit As the angle between the AC power supply input phase and the q axis of the rotor increases, the target DC component is changed to have an increasing tendency. The electrical device according to claim 1 .

3. a restricting mechanism for restricting power transmission in a power transmission mechanism connected to the rotor; The electrical device according to claim 1 .

4. at least one of the plurality of coils is a first phase coil forming an AC power supply input phase connected to an external AC power supply, the plurality of coils include a plurality of second phase coils forming DC conversion phases used for conversion between DC power; The power control unit controls the conversion between DC and DC power in combination with the plurality of second phase coils. The electrical device according to any one of claims 1 to 3.

5. a power supply connection member that connects the power control unit and the at least one coil to an external AC power supply; the plurality of second phase coils include first and second open-ended coils, the rotating electric machine includes a stator core in which a slot shared by the first coil and the second coil is formed, The power control unit a first full-bridge circuit connected to both ends of the first coil; a second full-bridge circuit connected to both ends of the second coil; at least one third full bridge circuit connected across at least one of the first phase coils; a first breaker connected between the positive electrodes of the first full-bridge circuit and the second full-bridge circuit; a second breaker connected between the negative electrodes of the first full-bridge circuit and the second full-bridge circuit; at least one third breaker connected between one end of at least one of the first phase coils and at least one of the third full bridge circuits; Equipped with The power supply connection member is connected to both ends of the third breaker.

5. The electrical device according to claim 4.

6. a power storage device; a rotating electric machine having a rotor and a plurality of coils; a power control unit connected to at least one of the coils and the power storage device, the power control unit controlling power exchange between the power storage device and the rotating electric machine; a phase acquisition unit that acquires the phase of the rotor; A control method for an electrical device comprising: When power is supplied from an external AC power supply to the power storage device via at least one of the plurality of coils and the power control unit, acquiring, by the phase acquisition unit, a stop phase of the rotor when the rotating electric machine is stopped; acquiring a target DC component to be superimposed on a target current of a current flowing through the coil by power supplied from the external AC power supply in accordance with a stop phase of the rotor; charging the power storage device by a power conversion operation based on the target current on which the target DC component is superimposed; have How to control electrical equipment.

Images