Wireless charging system and electric vehicle charging method based on wireless charging system

Abstract

The invention discloses a wireless charging system and an electric vehicle charging method based on the wireless charging system, a charging track module is provided with a groove, and a charging arm module partially extends into the groove and is coupled with the charging track module to form a complete charging loop; the two ends of the charging arm module are respectively provided with a charging arm balance module, the charging track module is provided with a balance control module aligned with the charging arm balance modules, and the balance control module is used for adjusting the magnetic force applied to the upper ends and the lower ends of the charging arm balance modules in the vertical direction when the charging arm module moves in the groove. And the position of the charging arm module in the groove is adjusted. According to the invention, the charging arm balance module and the balance control module aligned with the charging arm balance module are arranged, and the balance control module adjusts the position of the charging arm module by adjusting the magnetic force applied to the upper end and the lower end of the charging arm balance module in the vertical direction, so that the position of the charging arm module in the charging track module is stable; and the charging process is ensured to be smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless charging system and an electric vehicle charging method based on the wireless charging system. Background Art

[0002] In order to achieve green environmental protection, energy conservation and emission reduction, electric vehicles have developed rapidly in recent years. However, electric vehicles usually need to be charged at fixed locations, often requiring long-term parking, which is inconvenient. For example, for long-distance driving, it is necessary to queue up for a long time at the service area to charge, resulting in a waste of time. At the same time, the use scenarios of electric vehicles are limited, which is not conducive to further promotion.

[0003] Therefore, the current technology considers how to perform mobile wireless charging for electric vehicles. In the prior art, mobile charging of electric vehicles needs to be achieved by combining the chassis of the electric vehicle with the ground, which has problems such as low efficiency, high cost, and the need to update road infrastructure. At the same time, the charging arm moves in the charging track to generate an induced current to achieve charging. In this process, the movement may cause the position of the charging arm in the charging track to be unstable, which in turn causes the charging arm to collide with the charging track, affecting the smooth charging process. Therefore, how to stabilize the position of the charging arm in the charging track and ensure the smooth charging process is an urgent problem to be solved. Summary of the invention

[0004] The present invention provides a wireless charging system and an electric vehicle charging method based on the wireless charging system, so as to overcome the technical problem that the position of a charging arm in a charging track cannot be accurately controlled during wireless charging.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A wireless charging system comprises: a charging track module, a charging arm module and a power supply module;

[0007] The charging track module is provided with a groove for accommodating the charging arm module, the charging arm module partially extends into the groove, and is coupled with the charging track module to form a complete loop for charging the power module;

[0008] Charging arm balancing modules are respectively provided at both ends of the charging arm module, and the charging track module is provided with a balancing control module arranged in alignment with the charging arm balancing module. The balancing control module is used to adjust the position of the charging arm module in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module in the vertical direction when the charging arm module moves in the groove.

[0009] Further, the balance control module includes a charging arm position adjustment control module and a plurality of groups of excitation coils; the charging arm balance module includes at least one pair of balance magnets;

[0010] The charging arm position adjustment control module controls the excitation coil to continuously generate a uniform magnetic field, and adjusts the magnetic force applied to the upper and lower ends of the balancing magnet through the magnetic field.

[0011] Further, the balancing control module includes a charging arm position adjustment control module, several groups of excitation coils and a charging arm position detection sensor; the charging arm balancing module includes at least one pair of balancing magnets;

[0012] The charging arm position detection sensor is used to obtain the position information of the charging arm module and transmit it to the charging arm position adjustment control module. The charging arm position adjustment control module controls the excitation coil to generate a magnetic field according to the position information, and adjusts the magnetic force applied to the upper and lower ends of the balance magnet through the magnetic field.

[0013] Furthermore, the charging track module includes a track mounting shell and a charging control circuit, a primary coil unit and a track core unit arranged in the mounting shell; the primary coil unit is wound on the outer wall of the track core unit and is electrically connected to the charging control circuit;

[0014] The charging arm module includes a charging arm mounting shell and a mounting base arranged in the charging arm mounting shell, a secondary coil unit and a charging conversion unit; the mounting base is provided with a first mounting hole for mounting the balancing magnet and a second mounting hole for mounting the secondary coil unit, the balancing magnet is mounted in the first mounting hole, the secondary coil unit is mounted in the second mounting hole, and a pair of the balancing magnets are respectively located on both sides of the secondary coil unit; the charging conversion unit is electrically connected to the secondary coil unit and the power module respectively;

[0015] When the charging arm module moves in the groove, the charging control circuit can generate an induced current and transmit it to the secondary coil unit via the primary coil unit and the track core unit in sequence, and then the secondary coil unit transmits the induced current to the charging conversion unit, and the charging conversion unit is used to convert the induced current and transmit it to the power module, thereby charging the power module.

[0016] Furthermore, the balancing magnet is a permanent magnet or a coil core.

[0017] Furthermore, the charging arm position detection sensor is a photoelectric sensor or a Hall sensor.

[0018] A method for charging an electric vehicle based on a wireless charging system, characterized in that the specific steps include:

[0019] S1: The charging arm module is driven to move in the charging track module by the running of the electric vehicle, and the balancing control module adjusts the position of the charging arm module in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module in the vertical direction;

[0020] S2: the control circuit unit generates an induced current and transmits it to the secondary coil unit via the primary coil unit and the track core unit in sequence;

[0021] S3: transmitting the induced current to the charging conversion unit through the secondary coil unit;

[0022] S4: The induced current is converted by the charging conversion unit and transmitted to a power module in the electric vehicle, and the electric vehicle is charged based on the power module.

[0023] Beneficial effects: The present invention provides a charging track module, and the charging track module is provided with a groove for accommodating the charging arm module. The charging arm module partially extends into the groove and couples with the charging track module to form a complete loop for charging the power module, so that when the charging arm module moves in the charging track module, the power module can be wirelessly charged. At the same time, charging arm balancing modules are provided at both ends of the charging arm module, and the charging track module is provided with a balancing control module arranged in alignment with the charging arm balancing module. The balancing control module adjusts the magnetic force applied to the upper and lower ends of the charging arm balancing module in the vertical direction, thereby adjusting the position of the charging arm module in the groove, so that the position of the charging arm module in the charging track module is stable, thereby ensuring a smooth charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a structural schematic diagram of a wireless charging system in the present invention;

[0026] Figure 2 It is a first structural schematic diagram of the charging arm module in the present invention;

[0027] Figure 3 It is a second structural schematic diagram of the charging arm module in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the first control method in an embodiment of the present invention;

[0029] Figure 5 Schematic diagram of the structure of the second control method in an embodiment of the present invention;

[0030] Figure 6 This is a force analysis diagram of a balancing magnet in a magnetic field in an embodiment of the present invention.

[0031] In the figure: 1. Charging track module; 11. Primary coil unit; 12. Balance control module; 121. Excitation coil; 122. Charging arm position detection sensor; 13. Track core unit; 2. Charging arm module; 21. Charging arm balance module; 211. Balance magnet; 22. Secondary coil unit; 23. Mounting base; 3. Electric vehicle. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] This embodiment provides a wireless charging system, such as Figure 1 As shown, it includes: a charging track module 1, a charging arm module 2 and a power module; the charging track module 1 is provided with a groove for accommodating the charging arm module 2, the charging arm module 2 partially extends into the groove, and is coupled with the charging track module 1 to form a complete loop for charging the power module;

[0034] Specifically, Figure 1 As shown, the charging track module 1 includes a track mounting shell and a charging control circuit (not shown in the figure) arranged in the mounting shell, a primary coil unit 11 and a track core unit 13; the primary coil unit 11 is wound on the outer wall of the track core unit 13 and is electrically connected to the charging control circuit; Figure 2 and Figure 3As shown, the charging arm module 2 includes a charging arm mounting shell (not shown in the figure) and a mounting base 23, a secondary coil unit 22 and a charging conversion unit (not shown in the figure) arranged in the charging arm mounting shell; the charging conversion unit is electrically connected to the secondary coil unit 22 and the power module respectively; the charging track module itself generates a low-frequency alternating current. When the charging arm module 2 moves at a high speed in the groove, the induced current generated by the charging control circuit is sequentially transmitted to the secondary coil unit 22 via the primary coil unit 11 and the track core unit 13, and then the secondary coil unit 22 transmits the induced current to the charging conversion unit, and the charging conversion unit is used to convert the induced current and transmit it to the power module, thereby charging the power module.

[0035] Specifically, Figure 1 As shown, charging arm balancing modules 21 are respectively provided at both ends of the charging arm module 2, and the charging track module 1 is provided with a balancing control module 12 arranged in alignment with the charging arm balancing module 21. The balancing control module 12 is used to adjust the position of the charging arm module 2 in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module 21 in the vertical direction when the charging arm module moves in the groove.

[0036] The present invention proposes two ways to suspend the charging arm module 2 by controlling the charging arm balancing module 21. The first is that the charging track module generates a continuous magnetic field through the balancing control module 12, so that the charging arm module is continuously controlled by the magnetic field in the charging track module, so that it automatically returns to the left and right and up and down under the condition of multiple sets of magnetic forces. At this time, the charging arm module is in a magnetic suspension state, and no complex control is required. The stable operation of the charging arm can be achieved by maintaining the stability of the magnetic field in the charging track; the second is to set the charging arm module 2 as follows Figure 3 The arc structure shown in the figure, and the thickness of the front end of the charging arm module in the moving direction is greater than the thickness of the rear end. This structure is similar to the wing of an airplane, which can make the charging arm module in a balanced state under the action of gravity and air buoyancy when in the groove. The position information of the charging arm module is obtained by the charging arm position detection sensor, and the charging arm state is adjusted in real time according to the position information. Compared with the first method, this method does not need to continuously provide a magnetic field to change the magnetic force exerted on the charging arm module, but actively adjusts the data obtained by the charging arm position detection sensor.

[0037] For the first method, in a specific embodiment, as Figure 1 As shown, the balance control module 12 includes a charging arm position adjustment control module and a plurality of groups of excitation coils 121; Figure 2As shown, the charging arm balancing module 21 includes at least one pair of balancing magnets 211; the charging arm position adjustment control module controls the excitation coil 121 to continuously generate a uniform magnetic field, and adjusts the magnetic force applied to the upper and lower ends of the balancing magnet 211 through the magnetic field. Figure 2 As shown, the mounting base 23 is provided with a first mounting hole for mounting the balancing magnet and a second mounting hole for mounting the secondary coil unit, the balancing magnet 211 is mounted in the first mounting hole, the secondary coil unit 22 is mounted in the second mounting hole, and a pair of the balancing magnets 211 are respectively located on both sides of the secondary coil unit 22.

[0038] Specifically, in this embodiment, in order to keep the charging arm module running relatively smoothly, a balancing magnet is provided at both ends of the mounting base 23, so that the balancing magnet can be subjected to the magnetic field in multiple directions, such as front, back, left, and right, and thus be fully controlled. Figure 4 As shown, since the charging arm is moving, several groups of excitation coils are set at various positions corresponding to the balance magnet 211 in the charging track module 1 along the moving direction of the charging arm module to adjust the position of the charging arm and ensure that at least one group of excitation coils controls the charging arm during its movement, so that the charging arm can continue to operate stably in the charging track. When the electric car drives forward, it drives the charging arm to move, and the balance magnet in the charging arm module operates in a stable magnetic field. If the position of the charging arm changes at this time, the magnetic force on the charging arm will change, so that the charging arm can regain balance and achieve stable operation. Figure 6 As shown, a group of balancing magnets 211 are controlled by multiple groups of magnetic fields and acted upon by multiple forces. For example, the combined force of F1 and F2 causes a group of balancing magnets in the charging arm to be in a magnetic suspension state. When the position of a group of magnets is biased to the left, that is, F1>F2, the force on the magnets is adjusted by magnetic field control to return the first group of magnets to the middle balance position. Similarly, when the position of the first group of magnets is offset downward, the balancing magnets will return upward due to the action of the magnetic force, producing an automatic balancing charging arm suspension effect. Similarly, the other group of magnets will also return automatically. When the charging arm moves forward, the next group of excitation coils will take over the position control of the balancing magnet. This solution continuously controls the position of the balancing magnet by setting a uniform and dense magnetic field in the charging track, so that the charging arm can always achieve a magnetic suspension effect. Specifically, in the present embodiment, each of the balancing magnets includes three cylindrical magnets and passes through the mounting base 23. In practice, the balancing magnet may also be other controllable shapes and is not limited to a pair of balancing magnets. More pairs of balancing magnets may be arranged at both ends of the mounting base. The scheme proposed in the present embodiment is more reliable and the position control of the charging arm can be achieved without too much feedback.

[0039] In a specific embodiment, the balancing magnet 211 is a permanent magnet or a coil core.

[0040] For the second method, in a specific embodiment, Figure 5 As shown, the balancing control module 12 includes a charging arm position adjustment control module, several groups of excitation coils 121 and a charging arm position detection sensor 122; the charging arm balancing module 21 includes at least one pair of balancing magnets 211; the charging arm position detection sensor 122 is used to obtain the position information of the charging arm module 2 and transmit it to the charging arm position adjustment control module, and the charging arm position adjustment control module controls the excitation coil 121 to generate a magnetic field according to the position information, and adjusts the magnetic force applied to the upper and lower ends of the balancing magnet 211 through the magnetic field.

[0041] Specifically, Figure 5 As shown, a plurality of charging arm position sensors 122 are arranged in the charging track module, and a plurality of groups of excitation coils 121 are arranged at equal intervals. When the charging arm horizontally passes through the charging track, the charging arm position sensor will obtain signals of the left and right position and the front and back position of the charging arm. According to the position signals obtained by the charging arm position sensor, the charging arm position adjustment control module will control the current in the excitation coil, thereby adjusting the magnetic field generated by the excitation coil, and adjusting the magnetic force exerted on the balance magnet 211 through the magnetic field, so that the charging arm module is in a balanced state.

[0042] Specifically, when the charging arm deviates to the left or right or to the top or bottom, the photoelectric sensor in the charging track detects the position of the charging arm and feeds it back to the charging arm position adjustment control module. The charging arm position adjustment control module adjusts the coil current at the corresponding position, thereby adjusting the magnetic force on the charging arm by adjusting the magnetic field strength, and then returning the charging arm to the equilibrium position. Compared with the first method, this method can reduce the density of the excitation coil and control the magnetic force of the charging arm at a longer distance. Therefore, the charging magnetic field arrangement of this scheme is relatively simple, which can save costs and energy consumption.

[0043] Specifically, regardless of the first or second control method, the only resistance encountered by the charging arm module is air resistance, thereby significantly reducing the energy loss of the charging arm caused by friction and circuit contact.

[0044] In a specific embodiment, the charging arm position detection sensor 122 is a photoelectric sensor or a Hall sensor.

[0045] This embodiment also provides an electric vehicle charging method based on the wireless charging system, and the specific steps include:

[0046] S1: The charging arm module is driven to move in the charging track module by the running of the electric vehicle, and the balancing control module adjusts the position of the charging arm module in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module in the vertical direction;

[0047] S2: the control circuit unit generates an induced current and transmits it to the secondary coil unit via the primary coil unit and the track core unit in sequence;

[0048] S3: transmitting the induced current to the charging conversion unit through the secondary coil unit;

[0049] S4: The induced current is converted by the charging conversion unit and transmitted to a power module in the electric vehicle, and the electric vehicle is charged based on the power module.

[0050] Specifically, by generating a low-frequency changing magnetic field in the charging track module, the secondary coil unit in the charging arm will induce an induced current of a fixed frequency when passing through this changing magnetic field. When the charging arm moves forward at a fixed speed (such as 100km / h), the secondary coil in the charging arm will induce the high-frequency magnetic field change. The generated induced current is transformed by the rectification, filtering and inversion circuits of the charging conversion unit, and the energy in the charging track is transmitted to the power module, thereby charging the electric vehicle.

[0051] In this embodiment, if Figure 1 As shown, the electric car 3 hides the charging arm on the side of the car, such as the rear of the vehicle, through a connecting structure. When passing the charging track, the electric car extends the charging arm. For example, the charging arm is docked with the charging track set in the road through image recognition technology. After the charging arm enters the charging track module 1, the position control of the charging arm module is handed over to the charging track, and the vehicle only controls the forward speed of the charging arm. The charging arm is driven to move by the driving of the electric car 3, thereby achieving charging. In this embodiment, since the charging arm is installed on the side, the charging arm can enter the charging track from the side, reducing the requirements for the road surface, and the way the charging arm extends into the charging track can make the charging arm and the charging track connected more closely, the magnetic field coupling is more complete, and the charging efficiency is higher.

[0052] Specifically, in practice, the charging track module can be installed on urban expressways, highways and main roads in the city. It has little impact on the existing road network and can be upgraded to achieve wireless charging based on the existing road network. Moreover, through this charging method, the battery capacity of the existing electric vehicle can be greatly reduced. The battery of the electric vehicle itself only needs to ensure short-distance endurance. When entering the charging track, the vehicle is in a charging state, which also achieves unlimited distance endurance. It has a positive effect on promoting electric vehicles, improving economic benefits, and reducing urban air pollution, making it possible to popularize electric vehicles on a large scale.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless charging system, characterized in that: include: A charging track module (1), a charging arm module (2) and a power supply module; The charging track module (1) is provided with a groove for accommodating the charging arm module (2); the charging arm module (2) partially extends into the groove and is coupled with the charging track module (1) to form a complete circuit for charging the power module; The two ends of the charging arm module (2) are respectively provided with a charging arm balancing module (21); the charging track module (1) is provided with a balancing control module (12) arranged in alignment with the charging arm balancing module (21); the balancing control module (12) is used to adjust the position of the charging arm module (2) in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module (21) in the vertical direction when the charging arm module moves in the groove.

2. The wireless charging system according to claim 1, characterized in that: The balancing control module (12) comprises a charging arm position adjustment control module and a plurality of groups of excitation coils (121); the charging arm balancing module (21) comprises at least one pair of balancing magnets (211); The charging arm position adjustment control module controls the excitation coil (121) to continuously generate a uniform magnetic field, and adjusts the magnetic force applied to the upper and lower ends of the balancing magnet (211) through the magnetic field.

3. The wireless charging system according to claim 1, characterized in that: The balancing control module (12) comprises a charging arm position adjustment control module, a plurality of groups of excitation coils (121) and a charging arm position detection sensor (122); the charging arm balancing module (21) comprises at least one pair of balancing magnets (211); The charging arm position detection sensor (122) is used to obtain the position information of the charging arm module (2) and transmit it to the charging arm position adjustment control module. The charging arm position adjustment control module controls the excitation coil (121) to generate a magnetic field according to the position information, and adjusts the magnetic force applied to the upper and lower ends of the balancing magnet (211) through the magnetic field.

4. The wireless charging system according to claim 2 or 3, characterized in that: The charging track module (1) comprises a track installation shell, and a charging control circuit, a primary coil unit (11) and a track magnetic core unit (13) arranged in the installation shell; the primary coil unit (11) is wound on the outer wall of the track magnetic core unit (13) and is electrically connected to the charging control circuit; The charging arm module (2) comprises a charging arm mounting shell and a mounting seat (23) arranged in the charging arm mounting shell, a secondary coil unit (22) and a charging conversion unit; the mounting seat (23) is provided with a first mounting hole for mounting the balancing magnet and a second mounting hole for mounting the secondary coil unit, the balancing magnet (211) is mounted in the first mounting hole, the secondary coil unit (22) is mounted in the second mounting hole, and a pair of the balancing magnets (211) are respectively located on both sides of the secondary coil unit (22); the charging conversion unit is respectively electrically connected to the secondary coil unit (22) and the power module; When the charging arm module (2) moves in the groove, the charging control circuit can generate an induced current which is transmitted to the secondary coil unit (22) via the primary coil unit (11) and the track core unit (13) in sequence. Then, the secondary coil unit (22) transmits the induced current to the charging conversion unit. The charging conversion unit is used to convert the induced current and transmit it to the power module, thereby charging the power module.

5. The wireless charging system according to claim 4, characterized in that: The balancing magnet (211) is a permanent magnet or a coil core.

6. The wireless charging system according to claim 3, characterized in that: The charging arm position detection sensor (122) is a photoelectric sensor or a Hall sensor.

7. A method for charging an electric vehicle based on the wireless charging system according to claim 4, characterized in that: The specific steps include: S1: The charging arm module is driven to move in the charging track module by the running of the electric vehicle, and the balancing control module adjusts the position of the charging arm module in the groove by adjusting the magnetic force applied to the upper and lower ends of the charging arm balancing module in the vertical direction; S2: the control circuit unit generates an induced current and transmits it to the secondary coil unit via the primary coil unit and the track core unit in sequence; S3: transmitting the induced current to the charging conversion unit through the secondary coil unit; S4: The induced current is converted by the charging conversion unit and transmitted to a power module in the electric vehicle, and the electric vehicle is charged based on the power module.

Images