Vehicle charging circuit and device and vehicle

Abstract

The embodiment of the utility model provides a vehicle charging circuit and device and a vehicle, and relates to the technical field of automobiles. The circuit at least comprises first equipment, second equipment, a driving motor and a motor driver, wherein a plurality of windings are arranged in the driving motor; the motor driver at least can be in a first conduction state and a second conduction state; if the motor driver is in the first conduction state, the charging equipment, the to-be-charged equipment, the motor driver and at least one winding in the plurality of windings are in communication connection to form a first loop; the first loop is used for charging to-be-charged equipment and at least one winding according to charging equipment; if the motor driver is in a second conduction state, the at least one winding, the motor driver and the to-be-charged equipment are in communication connection to form a second loop; and the second loop is used for charging the to-be-charged equipment according to the at least one charged winding. The method is used for achieving the effects of reducing cost and saving space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a vehicle charging circuit, device and vehicle. BACKGROUND

[0002] With the continuous development of charging pile technology, the charging voltage supported by the charging pile is also increasing. In the case of limited voltage capacity of the power battery, how to charge the power battery of the vehicle after adapting it to the charging pile becomes a technical problem to be solved.

[0003] In the related art, a voltage reduction circuit is mainly deployed between the charging pile and the power battery, so that the input voltage of the charging pile is adjusted before charging the power battery, thereby preventing the power battery from being damaged.

[0004] This implementation not only increases the hardware cost, but also needs additional space to deploy the voltage reduction circuit, thereby affecting the performance of the vehicle. UTILITY MODEL CONTENT

[0005] The present application provides a vehicle charging circuit, device and vehicle to reduce cost and save space.

[0006] In a first aspect, the present application provides a vehicle charging circuit, which at least includes: a first device, a second device, a driving motor and a motor driver; the first device is an external device; the second device is a power battery in the current vehicle; any one of the first device and the second device is a charging device, and the other device is a device to be charged; wherein,

[0007] The driving motor includes a plurality of windings; the motor driver can be at least in a first conduction state and a second conduction state;

[0008] If the motor driver is in the first conduction state, at least one winding of the charging device, the device to be charged, the motor driver and the plurality of windings are communicatively connected to form a first loop; the first loop is used to charge the at least one winding and the device to be charged according to the charging device;

[0009] If the motor driver is in the second conduction state, the at least one winding, the motor driver and the device to be charged are communicatively connected to form a second loop; the second loop is used to charge the device to be charged according to the at least one winding after charging.

[0010] Optionally, the circuit further includes a first switching element;

[0011] The first switch element is located between the first device and the second device, and is configured to connect the first device and the second device after receiving the vehicle charging instruction.

[0012] Optionally, the motor driver comprises target components corresponding to the windings respectively; each target component comprises at least a first switch tube and a second switch tube; wherein,

[0013] The first switch tube is located between the winding and the charging device, and is configured to control the first loop to be turned on in a first time period after being turned on.

[0014] The second switch tube is located between the winding and the device to be charged, and is configured to control the second loop to be turned on in a second time period after being turned on.

[0015] Optionally, the first device is a charging device, and the second device is a device to be charged; the circuit further comprises a second switch element, wherein,

[0016] The second switch element is located between the second device and the driving motor, and is configured to connect the second device and the at least one winding after receiving the vehicle charging instruction, so as to control the first device to charge the second device and the at least one winding through the first loop, or control the at least one winding to charge the second device through the second loop.

[0017] Optionally, the first device is a charging device; the second device is a device to be charged; the circuit further comprises a third switch element.

[0018] The third switch element is located between the first device and the first switch tube, and is configured to connect the first loop, so as to control the first device to charge the at least one winding and the second device through the first loop.

[0019] Optionally, the first device is an external charging pile or an external power battery.

[0020] Optionally, the first device is a device to be charged, and the second device is a charging device; the circuit further comprises a fourth switch element, wherein,

[0021] The fourth switch element is located between the first device and the driving motor, and is used to connect the first device and the at least one winding after receiving the vehicle charging instruction, so as to control the second device to charge the first device and the at least one winding through the first loop, or control the at least one winding to charge the first device through the second loop.

[0022] Optionally, the first device is a device to be charged, and the second device is a charging device; the circuit further comprises a fifth switch element; wherein,

[0023] The fifth switch element is located between the second device and the first switch tube, and is used to connect the first loop, so as to control the second device to charge the at least one winding and the first device through the first loop.

[0024] In a second aspect, the present application provides a vehicle charging device, comprising the vehicle charging circuit according to any one of the first aspect.

[0025] In a third aspect, the present application provides a vehicle, comprising the vehicle charging device according to the second aspect.

[0026] The vehicle charging circuit, device and vehicle provided by the embodiments of the present application can realize energy storage of the winding when charging the device to be charged according to the first loop, and realize energy release of the winding when charging the device to be charged according to the second loop by multiplexing the at least one winding in the driving motor, so as to realize the purpose of step-down charging, which not only reduces the hardware cost of deploying an additional step-down circuit, but also saves hardware space. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0028] Figure 1 Structure diagram of a vehicle charging circuit provided by the embodiments of the present application Figure 1 ;

[0029] Figure 2 Structure diagram of a vehicle charging circuit provided by the embodiments of the present application Figure 2 ;

[0030] Figure 3 Structure diagram of a vehicle charging circuit provided by the embodiments of the present application Figure 3 ;

[0031] Figure 4A structure schematic diagram for charging the second device according to the first loop is provided for the embodiment of the present application.

[0032] Figure 5 A structure schematic diagram for charging the second device according to the second loop is provided for the embodiment of the present application.

[0033] Figure 6 A structure schematic diagram for charging the first device according to the first loop is provided for the embodiment of the present application.

[0034] Figure 7 A structure schematic diagram for charging the first device according to the second loop is provided for the embodiment of the present application.

[0035] Figure 8 A structure schematic diagram of a vehicle charging device is provided for the embodiment of the present application.

[0036] Figure 9 A structure schematic diagram of a vehicle is provided for the embodiment of the present application.

[0037] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0039] With the continuous development of charging pile technology, the charging voltage supported by the charging pile evolves from 500V to 750V, 1000V or even higher. At this time, when charging with the charging pile, generally, the constant current charging mode is used first, and then the constant voltage charging mode is used to realize fast charging. At this time, in the constant current charging mode, the battery capacity of the vehicle power battery changes from low to high. When the battery capacity is low, the voltage of the power battery is low, so the high voltage of the charging pile cannot be fully utilized, and therefore the voltage of the charging pile needs to be stepped down before charging the power battery.

[0040] Generally, the voltage relationship between the charging pile and the power battery can be decoupled by setting a voltage conversion device in the vehicle, so as to realize step-down charging.

[0041] This implementation generally requires additional power electronic conversion devices, not only wasting hardware space, but also increasing hardware cost.

[0042] The vehicle charging circuit provided by the application realizes the purpose of voltage reduction charging for the power battery by multiplexing the motor driver and the driving motor in the vehicle, thereby reducing hardware cost and saving hardware space.

[0043] The technical solutions of the application and how the technical solutions solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the application will be described below with reference to the drawings.

[0044] Figure 1 Structure diagram of a vehicle charging circuit provided by an embodiment of the application Figure 1 As shown in Figure 1 , the circuit comprises:

[0045] A first device 101, a second device 102, a driving motor 103, and a motor driver 104. The first device 101 is an external device; the second device 102 is a power battery in the current vehicle; any one of the first device 101 and the second device 102 is a charging device, and the other is a device to be charged.

[0046] Among them, the driving motor 103 comprises a plurality of windings (the number of windings included in the driving motor is related to the type of the driving motor, for example, in the case of a three-phase driving motor, as shown in Figure 1 , the driving motor can comprise three windings, namely LU, LV, and LW).

[0047] Among them, the motor driver can be at least in a first conduction state and a second conduction state.

[0048] If the motor driver is in the first conduction state, at least one winding of the charging device, the device to be charged, the motor driver, and the plurality of windings are communicatively connected to form a first loop; the first loop is used to charge the device to be charged and the at least one winding according to the charging device; if the motor driver is in the second conduction state, at least one winding, the motor driver, and the device to be charged are communicatively connected to form a second loop; the second loop is used to charge the device to be charged according to the at least one winding after charging.

[0049] In one example, assuming that the first device is a charging device and the second device is a device to be charged, when the motor driver is in the first conduction state, one end of the first device, the second device, at least one winding of the driving motor, and the motor driver are sequentially connected, and then connected to the other end of the first device, to form a first loop; when the motor driver is in the second conduction state, one end of at least one winding of the driving motor, the motor driver, and the second device are sequentially connected, and then connected to the other end of at least one winding of the driving motor, to form a second loop.

[0050] In another example, assuming that the first device is a device to be charged and the second device is a charging device, when the motor driver is in the first conduction state, one end of the second device, the first device, at least one winding of the driving motor, and the motor driver are sequentially connected, and then connected to the other end of the second device, to form a first loop; when the motor driver is in the second conduction state, one end of at least one winding of the driving motor, the motor driver, and the first device are sequentially connected, and then connected to the other end of at least one winding of the driving motor, to form a second loop.

[0051] In the above embodiment, at least one winding of the driving motor can be multiplexed to realize energy storage of the winding when charging the device to be charged according to the first loop, and realize energy release of the winding when charging the device to be charged according to the second loop, so as to realize the purpose of step-down charging, which not only reduces the hardware cost of deploying an additional step-down circuit, but also saves hardware space.

[0052] Figure 2 A structure diagram of a vehicle charging circuit provided by an embodiment of the present application Figure 2 As shown in Figure 2 The circuit includes a first device 201, a second device 202, a driving motor 203, and a motor driver 204; the first device 201 is an external device; the second device 202 is a power battery in the current vehicle; any one of the first device 201 and the second device 202 is a charging device, and the other is a device to be charged. Wherein, the driving motor 203 includes a plurality of windings (for example, LU, LV, and LW as shown in Figure 2 ).

[0053] The motor driver can be at least in a first conduction state and a second conduction state.

[0054] If the motor driver is in the first conduction state, the charging device, the device to be charged, the motor driver and at least one winding in the plurality of windings are communicatively connected to form a first loop; the first loop is configured to charge the device to be charged and the at least one winding according to the charging device; if the motor driver is in the second conduction state, the at least one winding, the motor driver and the device to be charged are communicatively connected to form a second loop; the second loop is configured to charge the device to be charged according to the at least one winding after being charged.

[0055] As shown in Figure 2 , the circuit further comprises a first switching element K1; the first switching element K1 is located between the charging device and the device to be charged; the first switching element K1 is configured to connect the charging device and the device to be charged after receiving the vehicle charging instruction.

[0056] In this embodiment, the charging device and the device to be charged can be connected after receiving the vehicle charging instruction, and the device to be charged can be charged based on the charging device.

[0057] In one example, the motor driver comprises target components corresponding to each winding; each target component comprises at least a first switch tube and a second switch tube; wherein,

[0058] The first switch tube is located in the first loop; after the first switch tube is turned on, the motor driver is in the first conduction state; at this time, the first switch tube is configured to control the first loop to be turned on in a first time period;

[0059] The second switch tube is located in the second loop; after the second switch tube is turned on, the motor driver is in the second conduction state; at this time, the second switch tube is configured to control the second loop to be turned on in a second time period.

[0060] In one example, as shown in Figure 2 , the first switch tube can be Figure 2 Q2, Q4 and Q6 as shown in Figure 3 , and the second switch tube can be Q1, Q3 and Q5 as shown in

[0061] In one example, the first time period and the second time period are associated with the period corresponding to the pulse width modulation signal; the first time period can be understood as the time period when the pulse width modulation signal is high in the period; the second time period can be understood as the time period when the pulse width modulation signal is low in the period.

[0062] In this embodiment, the first switch tube and the second switch tube in the motor driver can be controlled to be turned on and closed through the pulse width modulation signal, so as to realize step-down charging based on at least one winding in the driving motor.

[0063] In order to make the vehicle meet the needs of more implementation scenarios, some switching elements need to be deployed in the vehicle charging circuit, wherein the element type of each switching element deployed in the vehicle charging circuit can be a relay. At the same time, in order to protect the power battery of the vehicle, a switching element is usually arranged near the positive electrode and near the negative electrode of the power battery.

[0064] Referring to Figure 3 , Figure 3 A structure diagram of a vehicle charging circuit provided by an embodiment of the present application Figure 3 As shown in Figure 3 , the switching element near the positive electrode of the power battery of the current vehicle can be the sixth switching element K6, and the switching element near the negative electrode of the power battery of the current vehicle can be the fifth switching element K5. At this time, the vehicle charging can be realized by multiplexing the switching element near the negative electrode of the power battery, further saving the hardware cost and saving the hardware space.

[0065] At this time, on the basis of Figure 3 , the specific structure of the vehicle charging circuit provided by the present application is introduced in detail in combination with specific implementation scenarios.

[0066] Implementation scenario one: the first device is a charging device, and the second device is a device to be charged.

[0067] Optionally, when the first device charges the second device, the first device can be an external charging pile or an external power battery, so as to charge the power battery of the current vehicle through the charging pile, or use the power battery of other vehicles to charge the power battery of the current vehicle, so as to be applicable to different application scenarios and meet the charging needs of the vehicle.

[0068] As shown in Figure 3 , the circuit includes a first device 301, a second device 302, a driving motor 303, a motor driver 304 and a first switching element K1. The first switching element K1 is located between the charging device and the device to be charged; the first switching element K1 is used to connect the charging device and the device to be charged after receiving the vehicle charging instruction. The first device 301 is an external device; the second device 302 is a power battery in the current vehicle; any one of the first device 301 and the second device 302 is a charging device, and the other is a device to be charged. Wherein, the driving motor 303 includes Figures 4 to 5The LU, LV, and LW shown are used; the motor driver can be in at least a first conducting state and a second conducting state. In this case, if the motor driver is in the first conducting state, the charging device, the device to be charged, the motor driver, and at least one of the multiple windings are communicatively connected to form a first circuit; the first circuit is used to charge the device to be charged and at least one winding according to the charging device. If the motor driver is in the second conducting state, at least one winding, the motor driver, and the device to be charged are communicatively connected to form a second circuit; the second circuit is used to charge the device to be charged according to at least one charged winding.

[0069] like Figure 4 As shown, the circuit also includes a second switching element K2. The second switching element K2 is located between the second device and the drive motor; the second switching element is used to connect the second device and at least one winding after receiving a vehicle charging command, so as to control the first device to charge the second device and at least one winding through the first circuit, or to control at least one winding to charge the second device through the second circuit.

[0070] Optionally, such as Figure 5 As shown, the circuit also includes a third switching element K3. The third switching element K3 is located between the first device and the first switching transistor; the third switching element is used to connect the first circuit to control the first device to charge at least one winding and the second device through the first circuit.

[0071] See Figure 4 , Figure 5 This application provides a schematic diagram of a structure for charging a second device according to a first circuit. Figure 3 This is a schematic diagram illustrating a structure for charging a second device according to a second circuit, as provided in an embodiment of this application. Figure 3 As shown, after closing the first switching element K1, the second switching element K2, the third switching element K3, and the sixth switching element K6, the first switching transistor can be turned on within a first time period. This allows one end of the first device to be connected to the other end of the first device via the first switching element K1, the second device, the second switching element K2, at least one winding of the drive motor, the first switching transistor, and the third switching element K3, forming a first circuit. This charges the second device and stores energy for at least one winding of the drive motor. Figures 6 to 7 As shown, the second switch can be turned on during the second time period, so that one end of at least one winding of the drive motor is connected to the other end of at least one winding of the drive motor after passing through the second switch, the second device, and the second switching element K2, thereby realizing charging of the second device through at least one winding of the drive motor.

[0072] Implementation Scenario 2: The first device is the device to be charged, and the second device is the charging device.

[0073] Optionally, the first device can be an external power battery, at this time, the power battery of the current vehicle can be used to charge the power battery of other vehicles, so as to realize the direct current V2V (Vehicle to Vehicle, vehicle to vehicle) charging, so as to meet the charging demand of the vehicle and improve the user experience.

[0074] As shown in the figure, the circuit further comprises a fourth switching element K4. The fourth switching element K4 is located between the first device and the driving motor. The fourth switching element is used to connect the first device and the at least one winding after receiving the vehicle charging instruction, so as to control the second device to charge the first device and the at least one winding through the first loop, or control the at least one winding to charge the first device through the second loop. Figure 6 Optionally, as shown in the figure, the circuit can further use the fifth switching element K5 near the negative electrode of the power battery, and set the fifth switching element K5 between the second device and the first switch tube. The fifth switching element is used to connect the first loop, so as to control the second device to charge the at least one winding and the first device through the first loop.

[0075] Figure 7 Optionally, as shown in the figure, the circuit can further use the fifth switching element K5 near the negative electrode of the power battery, and set the fifth switching element K5 between the second device and the first switch tube. The fifth switching element is used to connect the first loop, so as to control the second device to charge the at least one winding and the first device through the first loop.

[0076] Referring to Figure 6 , Figure 7 a structure diagram for charging the first device according to the first loop provided by the embodiment of the application; Figure 8 a structure diagram for charging the first device according to the second loop provided by the embodiment of the application. As shown in the figure, Figure 8 After the first switching element K1, the third switching element K3, the fifth switching element K5 and the sixth switching element K6 are closed, the first switch tube can be turned on in the first time period, so that one end of the second device is connected to the other end of the second device through the first switching element K1, the first device, the third switching element K3, at least one winding in the driving motor, the first switch tube and the fifth switching element K5, to form the first loop, so as to charge the first device and store energy for at least one winding in the driving motor. As shown in the figure, Figure 8 The second switch tube can be turned on in the second time period, so that one end of at least one winding of the driving motor is connected to the other end of at least one winding of the driving motor through the second switch tube, the first switching element K1 and the first device, the third switching element K3, to realize charging the first device through at least one winding of the driving motor.

[0077] Referring to Figure 9 , Figure 9 a structure diagram of a vehicle charging device provided by the embodiment of the application, as shown in the figure, Figure 9 ​As shown, the vehicle charging device 800 includes the vehicle charging circuit of any of the above.

[0078] Referring to Figure 8 , ​ A structural schematic diagram of a vehicle provided by an embodiment of the present application is shown in ​ As shown, the vehicle includes ​ The vehicle charging device shown.

[0079] Finally, it should be noted that: after considering the specification and practicing the utility model disclosed herein, other embodiments of the utility model will be easily thought of by those skilled in the art. The utility model aims to cover any variations, uses or adaptability of the utility model, which follow the general principles of the utility model and include the common knowledge or conventional technical means in the technical field of the utility model not disclosed by the utility model, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the utility model is only limited by the appended claims.

Claims

1. A vehicle charging circuit, characterized by, The circuit comprises at least a first device, a second device, a driving motor and a motor driver; the first device is an external device; the second device is a power battery in the current vehicle; any one of the first device and the second device is a charging device, and the other is a device to be charged; wherein, The driving motor comprises a plurality of windings; the motor driver can be at least in a first conduction state and a second conduction state; If the motor driver is in the first conduction state, at least one winding of the plurality of windings, the motor driver and the device to be charged are communicatively connected to form a first loop; the first loop is used to charge the at least one winding and the device to be charged according to the charging device; If the motor driver is in the second conduction state, the at least one winding, the motor driver and the device to be charged are communicatively connected to form a second loop; the second loop is used to charge the device to be charged according to the at least one winding after charging.

2. The circuit of claim 1, wherein, The circuit further comprises a first switching element; The first switching element is located between the first device and the second device; the first switching element is used to connect the first device and the second device after receiving a vehicle charging instruction.

3. The circuit of claim 2, wherein, The motor driver comprises a target component corresponding to each winding; each target component comprises at least a first switch tube and a second switch tube; wherein, The first switch tube is located between the winding and the charging device; after the first switch tube is turned on, the motor driver is in the first conduction state; the first switch tube is used to control the first loop to be turned on in a first time period; The second switch tube is located between the winding and the device to be charged; after the second switch tube is turned on, the motor driver is in the second conduction state; the second switch tube is used to control the second loop to be turned on in a second time period.

4. The circuit of claim 3, wherein, The first device is a charging device, and the second device is a device to be charged; the circuit further comprises a second switching element, wherein, The second switching element is located between the second device and the driving motor; the second switching element is used to connect the second device and the at least one winding after receiving the vehicle charging instruction, so as to control the first device to charge the second device and the at least one winding through the first loop, or control the at least one winding to charge the second device through the second loop.

5. The circuit of claim 3, wherein, The first device is a charging device; the second device is a device to be charged; the circuit further comprises a third switching element; The third switching element is located between the first device and the first switch tube; the third switching element is used to connect the first loop, so as to control the first device to charge the at least one winding and the second device through the first loop.

6. The circuit of claim 4 or 5, characterized in that, The first device is an external charging pile or an external power battery.

7. The circuit of any one of claims 3 to 5, wherein, The first device is a device to be charged, and the second device is a charging device; the circuit further comprises a fourth switching element; wherein, The fourth switch element is located between the first device and the driving motor; and the fourth switch element is configured to, after receiving the vehicle charging instruction, connect the first device and the at least one winding to control the second device to charge the first device and the at least one winding through the first loop, or control the at least one winding to charge the first device through the second loop.

8. The circuit of any one of claims 3 to 5, wherein, The first device is a device to be charged, and the second device is a charging device; and the circuit further comprises a fifth switch element, wherein The fifth switch element is located between the second device and the first switch tube; and the fifth switch element is configured to connect the first loop to control the second device to charge the at least one winding and the first device through the first loop.

9. A vehicle charging device, characterized by, The vehicle charging device comprises the vehicle charging circuit according to any one of claims 1-8.

10. A vehicle characterized by comprising: The vehicle comprises the vehicle charging device according to claim 9.

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