A portable charging device for wireless charging of electric vehicles

Abstract

This invention provides a portable charging device for wireless charging of electric vehicles, relating to the field of wireless charging technology for electric vehicles. It includes: a portable body equipped with an energy storage device, a sensing device, and a driving device; a charging coil fixed to the portable body and connected to the energy storage device via a telescopic structure; and a controller connected to the energy storage device, charging coil, telescopic structure, sensing device, and driving device, comprising: a wireless communication module for acquiring the location information of the electric vehicle and transmitting charging parameters of the charging coil; a movement control module for processing environmental data and location information to obtain a corresponding movement path and moving to the location of the electric vehicle; and a charging control module for aligning the charging coil with the onboard coil of the electric vehicle, and, upon alignment, controlling the charging coil to begin charging the electric vehicle. The beneficial effect is that electric vehicles are not limited to using special parking spaces with installed wireless charging piles, avoiding the risk of the ground coil being crushed or falling into the ground with foreign metal objects.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology for electric vehicles, and more particularly to a portable charging device for wireless charging of electric vehicles. Background Technology

[0002] Wireless charging stations for electric vehicles have appeared on the market, adding a brand-new way to charge electric vehicles. Wireless charging technology, combined with autonomous driving and automatic parking technologies, completes the final link in the intelligent and connected ecosystem of electric vehicles. Current wireless charging station designs involve installation in fixed parking spaces, with the ground end consisting of a wall box, a ground coil, and connecting cables. This typical design occupies a portion of the fixed parking space, making installation relatively cumbersome in compact public parking lots. This design also leaves the ground coil exposed to the open environment, inevitably subject to being run over by vehicles and falling metal objects. Furthermore, if a vehicle without wireless charging capability occupies the parking space, the charging station cannot be used by other vehicles with wireless charging capabilities, causing inconvenience to users and reducing the utilization rate of the charging station, resulting in resource waste. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a portable charging device for wireless charging of electric vehicles, comprising:

[0004] A movable body, wherein the movable body is equipped with an energy storage device, a sensing device and a driving device;

[0005] A charging coil is fixed to the movable body via a telescopic structure, and the charging coil is connected to the energy storage device.

[0006] A controller, connected to the energy storage device, the charging coil, the telescopic structure, the sensing device, and the driving device, respectively, includes:

[0007] A wireless communication module is used to communicate wirelessly with an electric vehicle that needs to be charged in order to obtain the location information of the electric vehicle and to send the charging parameters of the charging coil.

[0008] A mobile control module, connected to the wireless communication module, is used to acquire environmental data collected by the sensing device, process the environmental data and the location information to obtain a corresponding mobile path, and control the driving device to drive the movable body to the location of the electric vehicle according to the mobile path.

[0009] A charging control module, connected to the wireless communication module, is used to control the telescopic mechanism to drive the charging coil to extend away from the movable body, so that the charging coil is aligned with the vehicle-mounted coil of the electric vehicle. Then, the wireless communication module obtains the status information fed back by the electric vehicle, and when the status information indicates that the alignment is complete, it controls the charging coil to start charging the electric vehicle using the electrical energy stored in the energy storage device according to the device parameters.

[0010] Preferably, the energy storage device includes a battery charging module and a battery pack;

[0011] The battery charging module is used to convert the mains frequency power into DC power to charge the battery pack when the battery pack is low on power.

[0012] The battery pack is used to store electrical energy and to power the charging coil, the sensing device, the driving device, and the controller.

[0013] Preferably, the sensing device includes: a camera, and / or radar, and / or an ultrasonic sensor.

[0014] Preferably, the charging control module includes:

[0015] A magnetic field generating unit is used to control the charging coil to be energized according to the charging current contained in the status information and adjust the real-time current to generate a magnetic field so that the vehicle coil generates an induced current and sends an alignment signal.

[0016] The alignment unit, connected to the magnetic field generating unit, is used to control the telescopic mechanism to start moving the charging coil according to the alignment signal, and to control the telescopic mechanism to stop moving and send a charging signal when the coupling coefficient contained in the status information fed back by the electric vehicle is greater than a preset threshold, and to control the telescopic mechanism to continue to extend and retract until the coupling coefficient is greater than the threshold when the telescopic coupling coefficient is not greater than the threshold.

[0017] A charging unit, connected to the alignment unit, is used to control the charging coil to charge the electric vehicle according to the charging current based on the charging signal.

[0018] Preferably, the portable charging device has a built-in receiving cavity for accommodating the telescopic structure, then the telescopic mechanism includes:

[0019] A folding telescopic rod, one end of which is connected to the inner wall of the receiving cavity;

[0020] The charging coil plate has an internal space for storing the charging coil. The charging coil plate is connected to the other end of the folding telescopic rod. The bottom of the charging coil plate is also provided with multiple sliding wheels.

[0021] Preferably, the charging coil includes:

[0022] Litz wire, the lower surface of which is connected to a Litz wire tray, the Litz wire tray being placed on a ferrite tray;

[0023] Ferrite, which is disposed on the upper surface of the Litz wire and connected to the ferrite tray;

[0024] The chassis, on which the ferrite tray is placed;

[0025] The upper cover is disposed on the chassis and fixes the Litz wire, the Litz wire tray, the ferrite, and the ferrite tray between the upper cover and the chassis;

[0026] The chassis is connected to the inner bottom surface of the charging coil plate, and the top cover is connected to the inner top surface of the charging coil plate.

[0027] Preferably, the charging coil includes:

[0028] The first field-effect transistor has its source connected to the positive terminal of the energy storage device and the source of the second field-effect transistor. The drain of the first field-effect transistor is connected to the source of the third field-effect transistor and one end of the first inductor. The drain of the third field-effect transistor is connected to the negative terminal of the energy storage device and the drain of the fourth field-effect transistor. The source of the fourth field-effect transistor is connected to the drain of the second field-effect transistor.

[0029] A first capacitor, one end of which is connected to the other end of the first inductor, the other end of which is connected to the source of the fourth field-effect transistor and one end of the first resistor, the other end of the first resistor being connected to one end of the second inductor, the other end of the second inductor being connected to one end of the second capacitor, and the other end of the second capacitor being connected to one end of the first capacitor.

[0030] Preferably, the on-board coil of the electric vehicle includes:

[0031] A third inductor, one end of which is connected to one end of a second resistor, the other end of which is connected to one end of a third capacitor, the other end of which is connected to one end of a fourth capacitor and one end of a fourth inductor, the other end of which is connected to the other end of the third inductor, the other end of which is connected to the anode of a first diode, the cathode of the first diode is connected to the cathode of a second diode, and the anode of the second diode is connected to the other end of the second resistor;

[0032] The vehicle battery has its positive terminal connected to the cathode of the second diode, its negative terminal connected to the drain of the fifth field-effect transistor and the drain of the sixth field-effect transistor, its source connected to the anode of the second diode, and its source connected to the anode of the first diode.

[0033] Preferably, if the environmental data includes the movable body's own position information and obstacle position information, then the motion control module includes:

[0034] A path planning unit is used to process the location information and its own location information to obtain an initial path between the movable body and the electric vehicle;

[0035] A path adjustment unit, connected to the path planning unit, is used to adjust the initial path according to the obstacle location information corresponding to the initial path to obtain a movement path;

[0036] A motion control unit, connected to the path adjustment unit, is used to control the drive device to drive the movable body to move to the location of the electric vehicle according to the motion path.

[0037] Preferably, the bottom of the movable body is provided with multiple wheels.

[0038] The above technical solution has the following advantages or beneficial effects:

[0039] 1) By using the mobile charging device provided by this invention, electric vehicles are not limited to using special parking spaces with wireless charging piles installed. The mobile charging device can automatically find the parking space where the vehicle is parked and provide charging services.

[0040] 2) The portable charging device provided by this invention eliminates the need to install wireless charging piles, thus avoiding the risk of ground coils being crushed or falling into metal objects. Attached Figure Description

[0041] Figure 1 A schematic diagram of the structure of a portable charging device for wireless charging of electric vehicles is shown in a preferred embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of the telescopic structure when it is contracted, as shown in a preferred embodiment of the present invention.

[0043] Figure 3 This is a schematic diagram of the telescopic structure when it is extended, as shown in a preferred embodiment of the present invention.

[0044] Figure 4 A side view of the telescopic structure in a preferred embodiment of the present invention;

[0045] Figure 5 A schematic diagram of the charging coil structure is shown in a preferred embodiment of the present invention;

[0046] Figure 6 The circuit diagram of the charging coil and the vehicle coil is shown in a preferred embodiment of the present invention. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0048] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a portable charging device for wireless charging of electric vehicles is provided, such as... Figure 1 As shown, it includes:

[0049] The movable body 1 is equipped with an energy storage device 2, a sensing device 3 and a driving device 4.

[0050] The charging coil 5 is fixed to the movable body 1 via the telescopic structure 6, and the charging coil 5 is connected to the energy storage device 2.

[0051] Controller 7 is connected to energy storage device 2, charging coil 5, telescopic structure 6, sensing device 3, and driving device 4 respectively. Controller 7 includes:

[0052] The wireless communication module 100 is used to communicate wirelessly with the electric vehicle 8 that needs to be charged in order to obtain the location information of the electric vehicle and to send the charging parameters of the charging coil.

[0053] The mobile control module 200 is connected to the wireless communication module 100. It is used to acquire environmental data collected by the sensing device, process the environmental data and location information to obtain the corresponding mobile path, and control the driving device to drive the movable body to the location of the electric vehicle 8 according to the mobile path.

[0054] The charging control module 300 is connected to the wireless communication module 100 and is used to control the telescopic structure 6 to drive the charging coil 5 to extend away from the movable body 1 so that the charging coil 5 is aligned with the vehicle coil 81 of the electric vehicle 8. Then, the wireless communication module 100 obtains the status information fed back by the electric vehicle 8, and when the status information indicates that the alignment is completed, it controls the charging coil 5 to start charging the electric vehicle 8 using the electrical energy stored in the energy storage device 2 according to the device parameters.

[0055] In a preferred embodiment of the present invention, such as Figure 1 As shown, the energy storage device 2 includes a battery charging module 21 and a battery pack 22;

[0056] The battery charging module 21 is used to convert the mains frequency power into DC power to charge the battery pack 22 when the battery pack 22 is low in power.

[0057] The battery pack 22 is used to store electrical energy and power the charging coil 5, sensing device 3, driving device 4 and controller 7.

[0058] In a preferred embodiment of the present invention, the sensing device 3 includes: a camera, and / or radar, and / or an ultrasonic sensor.

[0059] Specifically, in this embodiment, the sensing device 3 uses a camera, and / or radar, and / or ultrasonic sensors to collect the location information of the surrounding road environment, vehicles, pedestrians and other obstacles, as well as the location information of the movable body 1 itself, as environmental data.

[0060] In a preferred embodiment of the present invention, such as Figure 1 As shown, the charging control module 300 includes:

[0061] The magnetic field generating unit 301 is used to control the charging coil to be energized according to the charging current contained in the status information and adjust the real-time current to generate a magnetic field so that the on-board coil 81 generates an induced current and sends an alignment signal.

[0062] Alignment unit 302 is connected to magnetic field generating unit 301. It is used to control the telescopic structure 6 to extend and retract according to the alignment signal to drive the charging coil 5 to move. When the coupling coefficient contained in the status information fed back by electric vehicle 8 is greater than a preset threshold, it controls the telescopic structure 6 to stop moving and sends a charging signal. When the telescopic coupling coefficient is not greater than the threshold, it controls the telescopic structure 6 to continue to extend and retract until the coupling coefficient is greater than the threshold.

[0063] The charging unit 303 is connected to the alignment unit 302 and is used to control the charging coil 5 to charge the electric vehicle 8 according to the charging current based on the charging signal.

[0064] Specifically, in this embodiment, the portable charging device sends charging parameters, including the maximum allowable charging current, the minimum allowable charging current, and the coil self-inductance of the charging coil 5, to the electric vehicle 8 via the wireless communication module 100. The electric vehicle 8 processes the charging parameters to obtain the charging current and feeds it back to the portable charging device. The portable charging device controls the charging coil to be energized and adjusts the real-time current to generate a magnetic field based on the charging current, so that the on-board coil 81 can generate an induced current through electromagnetic induction. The electric vehicle 8 processes the induced current to obtain the coupling coefficient and feeds it back to the portable charging device in real time. When the coupling coefficient is greater than the threshold, it indicates that the charging coil 5 and the on-board coil 81 have been aligned. At this time, the telescopic structure 6 is controlled to stop moving and the charging coil 5 is controlled to charge the electric vehicle 8 according to the charging current.

[0065] Preferably, since the positions of the on-board coil 81 of electric vehicles 8 of different brands are different, the telescopic structure 6 has multiple options for the movement path, such as telescopic in one direction or scanning back and forth in a "Z" shape. The corresponding movement path can be preset according to the brand of electric vehicle 8, and the corresponding movement path can be selected by obtaining the brand of electric vehicle 8 through the wireless communication module 100, which facilitates the rapid alignment of charging coil 5 and on-board coil 81 and improves efficiency.

[0066] In a preferred embodiment of the present invention, such as Figure 2 and Figure 3 and Figure 4 As shown, the portable charging device has a built-in cavity for housing the telescopic structure 6, which includes:

[0067] A folding telescopic rod 61, one end of which is connected to the inner wall of the receiving cavity;

[0068] The charging coil plate 62 has an internal space for storing the charging coil 5. The charging coil plate 62 is connected to the other end of the folding telescopic rod 61. The bottom of the charging coil plate 62 is also provided with multiple sliding wheels 63.

[0069] In a preferred embodiment of the present invention, such as Figure 5 As shown, the charging coil 5 includes:

[0070] Litz wire 51, the lower surface of which is connected to Litz wire tray 52, which is placed on ferrite tray 53;

[0071] Ferrite 54 is placed on the upper surface of Litz line 51 and connected to ferrite tray 53.

[0072] The chassis 55 and the ferrite tray 53 are placed on the chassis;

[0073] The upper cover 56 is placed on the chassis 66, and the Litz wire 61, Litz wire tray 52, ferrite 54, and ferrite tray 53 are fixed between the upper cover 56 and the chassis 55.

[0074] The chassis 55 is connected to the inner bottom surface of the charging coil plate 62, and the top cover 56 is connected to the inner top surface of the charging coil plate 62.

[0075] In a preferred embodiment of the present invention, such as Figure 6 As shown, the charging coil 5 includes:

[0076] The first field-effect transistor FET1 has its source connected to the positive terminal of the energy storage device 2 and the source of the second field-effect transistor FET2. The drain of the first field-effect transistor FET1 is connected to the source of the third field-effect transistor FET3 and one end of the first inductor L1. The drain of the third field-effect transistor FET3 is connected to the negative terminal of the energy storage device 2 and the drain of the fourth field-effect transistor FET4. The source of the fourth field-effect transistor FET4 is connected to the drain of the second field-effect transistor FET2.

[0077] The first capacitor C1 has one end connected to the other end of the first inductor L1. The other end of the first capacitor C1 is connected to the source of the fourth field-effect transistor FET4 and one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second inductor L2. The other end of the second inductor L2 is connected to one end of the second capacitor C2. The other end of the second capacitor C2 is connected to one end of the first capacitor C1.

[0078] Specifically, in this embodiment, the charging coil 5 is energized according to the charging current in the feedback status information, and generates a magnetic field through the second inductor L2, causing the on-board coil 81 to generate an induced current.

[0079] In a preferred embodiment of the present invention, such as Figure 6 As shown, the on-board coil 81 of the electric vehicle 8 includes:

[0080] The third inductor L3, one end of the third inductor L3 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and one end of the fourth inductor L4, the other end of the third capacitor C3 is connected to the other end of the third inductor L3, the other end of the fourth inductor L4 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the other end of the second resistor R2;

[0081] The on-board battery BT has its positive terminal connected to the cathode of the second diode D2, and its negative terminal connected to the drain of the fifth field-effect transistor FET5 and the drain of the sixth field-effect transistor FET6. The source of the fifth field-effect transistor FET5 is connected to the anode of the second diode D2, and the source of the sixth field-effect transistor FET6 is connected to the anode of the first diode D1.

[0082] Specifically, in this embodiment, during the alignment process of the charging coil 5 and the vehicle-mounted coil 81, the fifth field-effect transistor FET5 and the sixth field-effect transistor FET6 are turned on. The electric vehicle 8 detects the current value of the induced current generated by the vehicle-mounted coil 81. The vehicle-mounted coil 81 of the electric vehicle 8 is oriented according to the formula...

[0083]

[0084] The coupling coefficient K is calculated.

[0085] in,

[0086] In the above formula, L va C is the self-inductance of the third inductor L3. va Here, ω is the capacitance value of the third capacitor C3, and I is a preset coefficient. rec I represents the current value of the on-board coil 81. ga L represents the current value of charging coil 5. ga The self-inductance of the second inductor L2; when the calculated coupling coefficient K is greater than 0.1, it indicates that the charging coil 5 and the vehicle coil 81 are aligned, the electric vehicle 8 turns off the fifth field-effect transistor FET5 and the sixth field-effect transistor FET6, and the portable charging device controls the charging coil 5 to charge the electric vehicle 8 according to the charging current.

[0087] In a preferred embodiment of the present invention, the environmental data includes the movable body's own position information and obstacle position information, then the motion control module 200 includes:

[0088] The path planning unit 201 is used to process the location information and its own location information to obtain the initial path between the movable body and the electric vehicle.

[0089] The path adjustment unit 202 is connected to the path planning unit 201 and is used to adjust the initial path according to the obstacle position information on the initial path to obtain the movement path.

[0090] The motion control unit 203 is connected to the path adjustment unit 202 and is used to control the drive device to drive the movable body to move to the location of the electric vehicle according to the motion path.

[0091] Specifically, in this embodiment, when an electric vehicle 8 that needs to be charged establishes communication with a mobile charging device, the mobile charging device generates an initial path with the shortest distance based on the location information of the electric vehicle 8 and its own location information. Because there may be obstacles such as vehicles and pedestrians on the initial path, the initial path needs to be adjusted to obtain a moving path. Finally, the device moves to the location of the electric vehicle 8 according to the moving path to perform subsequent charging control.

[0092] In a preferred embodiment of the present invention, the bottom of the movable body 1 is provided with a plurality of wheels.

[0093] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A portable charging device for wireless charging of electric vehicles, characterized in that, include: A mobile body, which is equipped with energy storage devices, sensing devices and driving devices; The charging coil is fixed to the movable body via a telescopic mechanism, and the charging coil is connected to the energy storage device. The controller, which is connected to the energy storage device, charging coil, telescopic mechanism, sensing device, and driving device, includes: The wireless communication module is used to communicate wirelessly with an electric vehicle that needs to be charged in order to obtain the location information of the electric vehicle and to send the charging parameters of the charging coil. The mobile control module, connected to the wireless communication module, is used to acquire environmental data collected by the sensing device, process the environmental data and location information to obtain the corresponding mobile path, and control the drive device to drive the movable body to the location of the electric vehicle according to the mobile path. The charging control module, connected to the wireless communication module, is used to control the telescopic mechanism to extend the charging coil away from the movable body so that the charging coil is aligned with the vehicle's on-board coil. Then, the wireless communication module obtains the status information fed back by the electric vehicle, and when the status information indicates that the alignment is complete, it controls the charging coil to start charging the electric vehicle using the electrical energy stored in the energy storage device according to the charging parameters. The charging coil includes: The first field-effect transistor has its source connected to the positive terminal of the energy storage device and the source of the second field-effect transistor. The drain of the first field-effect transistor is connected to the source of the third field-effect transistor and one end of the first inductor, respectively. The drain of the third field-effect transistor is connected to the negative terminal of the energy storage device and the drain of the fourth field-effect transistor. The source of the fourth field-effect transistor is connected to the drain of the second field-effect transistor. The first capacitor has one end connected to the other end of the first inductor, the other end of the first capacitor is connected to the source of the fourth field-effect transistor and one end of the first resistor, the other end of the first resistor is connected to one end of the second inductor, the other end of the second inductor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to one end of the first capacitor. The on-board coils of electric vehicles include: The third inductor, one end of the third inductor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third capacitor, the other end of the third capacitor is connected to one end of the fourth capacitor and one end of the fourth inductor, the other end of the third capacitor is connected to the other end of the third inductor, the other end of the fourth inductor is connected to the anode of the first diode, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the other end of the second resistor. The vehicle battery has its positive terminal connected to the cathode of the second diode, its negative terminal connected to the drain of the fifth and sixth field-effect transistors, its source connected to the anode of the second diode, and its source connected to the anode of the first diode.

2. The portable charging device according to claim 1, characterized in that, Energy storage devices include battery charging modules and battery packs; The battery charging module is used to convert the mains frequency power into DC power to charge the battery pack when the battery pack is low on power. The battery pack is used to store electrical energy and power the charging coil, sensing devices, drive devices, and controllers.

3. The portable charging device according to claim 1, characterized in that, Sensing devices include: cameras, and / or radar, and / or ultrasonic sensors.

4. The portable charging device according to claim 1, characterized in that, The charging control module includes: The magnetic field generating unit is used to control the charging coil to be energized according to the charging current contained in the status information and adjust the real-time current to generate a magnetic field so that the on-board coil generates an induced current and sends an alignment signal. The alignment unit, connected to the magnetic field generating unit, is used to control the telescopic mechanism to start moving the charging coil according to the alignment signal, and to control the telescopic mechanism to stop moving and send a charging signal when the coupling coefficient contained in the status information fed back by the electric vehicle is greater than a preset threshold, and to control the telescopic mechanism to continue to extend and retract until the coupling coefficient is greater than the threshold when the telescopic coupling coefficient is not greater than the threshold. The charging unit, connected to the alignment unit, is used to control the charging coil to charge the electric vehicle according to the charging current based on the charging signal.

5. The portable charging device according to claim 1, characterized in that, The portable charging device has a built-in cavity for housing the telescopic mechanism, which includes: A folding telescopic rod, one end of which is connected to the inner wall of the receiving cavity; The charging coil plate has an internal space for storing the charging coil. The charging coil plate is connected to the other end of the folding telescopic rod, and the bottom of the charging coil plate is also equipped with multiple sliding wheels.

6. The portable charging device according to claim 5, characterized in that, The charging coil includes: Litz wire, the lower surface of which is connected to a Litz wire tray, which is placed on a ferrite tray; Ferrite, the ferrite cap is placed on the upper surface of the Litz wire and connected to the ferrite tray; The chassis, with the ferrite tray placed on it; The top cover is placed on the chassis and fixes the Litz wire, Litz wire tray, ferrite, and ferrite tray between the top cover and the chassis. The chassis is connected to the inner bottom surface of the charging coil plate, and the top cover is connected to the inner top surface of the charging coil plate.

7. The portable charging device according to claim 1, characterized in that, Environmental data includes the mobile body's own position information and obstacle position information; therefore, the motion control module includes: The path planning unit is used to process the location information and its own location information to obtain the initial path between the mobile body and the electric vehicle. The path adjustment unit, connected to the path planning unit, is used to adjust the initial path according to the obstacle location information on the initial path to obtain the movement path. The motion control unit, connected to the path adjustment unit, is used to control the drive device to move the movable body to the location of the electric vehicle according to the motion path.

8. The portable charging device according to claim 1, characterized in that, The movable body has multiple wheels at its bottom.

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