WO2018196284A1

WO2018196284A1 - Wireless charging device, coil switching method therefor, and related devices

Info

Publication number: WO2018196284A1
Application number: PCT/CN2017/104961
Authority: WO
Inventors: 范金焰
Original assignee: 上海蔚来汽车有限公司
Priority date: 2017-04-27
Filing date: 2017-09-30
Publication date: 2018-11-01
Also published as: CN107181327B; CN107181327A

Abstract

A wireless charging device, a coil switching method therefor, a charging station and a smart garage, the charging device comprising: a phase detecting module and at least two wireless charging transmitting coils (3, 4)/wireless charging receiving coils (1, 2); the wireless charging transmitting coils (3, 4)/wireless charging receiving coils (1, 2) are arranged in parallel according to a preset interval; both the charging station and the smart garage comprise the wireless charging device. The wireless charging device, the coil switching method therefor, the charging station and the smart garage may ensure that, when the positions of wireless charging receiving coils (1, 2)/wireless charging transmitting coils (3, 4) which correspond to the wireless charging transmitting coils (3, 4)/wireless charging receiving coils (1, 2) change, the interval between the wireless charging transmitting coils (3, 4)/wireless charging receiving coils (1, 2) and the wireless charging receiving coils (1, 2)/wireless charging transmitting coils (3, 4) which correspond thereto may reach a set wireless charging distance such that electrical energy transmission may be performed according to the maximum power transmission efficiency.

Description

Wireless charging device and coil switching method thereof, related device

Technical field

The present invention relates to the field of electric vehicle charging technology, and in particular, to a wireless charging device, a coil switching method thereof, and a related device.

Background technique

The wireless energy transmission technology can effectively overcome the problems of poor mobility of the equipment, unsightly environment, easy contact spark, and exposure of the power supply line, which eliminates the hidden dangers of the traditional power supply mode and makes the whole power supply process more secure. At present, wireless transmission can be roughly divided into: electromagnetic induction type, electromagnetic radiation type and magnetic coupling resonance type; electromagnetic induction type transmission distance is short, efficiency is low; electromagnetic radiation type transmission distance is long, transmission efficiency is low, and transmission power is milliwatt level; The magnetically coupled resonant mode enables efficient energy transfer over a range of meters.

The magnetic coupling resonant wireless charging method mainly includes a wireless charging transmitting coil and a wireless charging receiving coil. Wherein, the wireless charging transmitting coil is disposed under the ground, and the wireless charging receiving coil is disposed in the vehicle chassis of the electric vehicle. However, due to variations in the height of the chassis of the electric vehicle of different models, the resonance frequency changes accordingly, resulting in a decrease in power transmission efficiency and affecting the charging efficiency of the power battery of the electric vehicle.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, it is to solve the technical problem that the magnetic coupling charging wireless power transmission method has low charging power and low charging efficiency for charging electric vehicles of different vehicle chassis heights. The present invention provides a wireless charging device and a coil switching method thereof, and also provides an electric vehicle, a charging station and a garage including the wireless charging device.

In a first aspect, the technical solution of the first wireless charging device in the present invention is:

The device includes:

At least two wireless charging transmitting coils, the wireless charging transmitting coils being arranged in parallel according to a first preset interval;

Each of the wireless charging transmitting coils is respectively provided with a first switch for controlling the on/off of the wireless charging transmitting coil, and the first switch is configured to select a selected wireless charging transmission according to the set first wireless charging distance. Coil.

Further, a preferred technical solution provided by the present invention is:

The wireless charging transmitting coil performs power transmission according to a magnetic coupling resonance mode.

Further, a preferred technical solution provided by the present invention is:

The device further includes a first phase detecting module, configured to detect a phase difference between a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and control the The wireless charging transmitting coil having the smallest phase difference supplies power to the wireless charging receiving coil.

Further, a preferred technical solution provided by the present invention is that the first phase detecting module includes a first coil switching unit, a first phase calculating unit, and a first phase comparing unit;

The first coil switching unit is configured to control the wireless charging transmitting coils to sequentially supply power to the wireless charging receiving coil;

The first phase calculating unit is configured to detect a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and calculate a phase difference between the resonant voltage and the resonant current;

The first phase comparison unit is configured to compare phase differences of the wireless charging transmitting coils, and control the wireless charging transmitting coil with the smallest phase difference to supply power to the wireless charging receiving coil.

Further, a preferred technical solution provided by the present invention is:

The deviation between the first preset spacing of the wireless charging transmitting coil and the first spacing is less than the first deviation threshold; wherein the first spacing is a spacing of the wireless charging receiving coils corresponding to the wireless charging transmitting coil.

Further, a preferred technical solution provided by the present invention is:

The deviation of the second pitch of the wireless charging transmitting coil from the third spacing is less than the second deviation threshold;

The second spacing is a distance between the wireless charging transmitting coil and a wireless charging receiving coil corresponding thereto; the third spacing is when the wireless charging transmitting coil and the corresponding wireless charging receiving coil are coaxially placed The best transmission distance.

Further, a preferred technical solution provided by the present invention is:

The second deviation threshold is 3 cm.

In a second aspect, the technical solution of the second wireless charging device in the present invention is:

The device includes:

At least two wireless charging receiving coils, the wireless charging receiving coils being arranged in parallel according to a second preset interval;

Each of the wireless charging and receiving coils is respectively provided with a second switch for controlling the on/off of the wireless charging receiving coil, and the second switch is configured to select a selected wireless charging and receiving according to the set second wireless charging distance. Coil.

Further, a preferred technical solution provided by the present invention is:

The wireless charging receiving coil performs power transmission according to a magnetic coupling resonance mode.

Further, a preferred technical solution provided by the present invention is:

The device further includes a second phase detecting module, configured to detect a phase difference between the resonant voltage and the resonant current when the wireless charging receiving coils supply power to the load, and control the phase difference to be minimum The wireless charging receiving coil supplies power to the load.

Further, a preferred technical solution provided by the present invention is:

The second phase detecting module includes a second coil switching unit, a second phase calculating unit, and a second phase comparing unit;

The second coil switching unit is configured to control the wireless charging receiving coils to sequentially supply power to the load;

The second phase calculating unit is configured to detect a resonant voltage and a resonant current when the wireless charging receiving coils supply power to the load, and calculate a phase difference between the resonant voltage and the resonant current;

The second phase comparison unit is configured to compare phase differences of the wireless charging receiving coils, and control the wireless charging receiving coil with the smallest phase difference to supply power to the load.

Further, a preferred technical solution provided by the present invention is:

The deviation between the second preset spacing and the fourth spacing of the wireless charging receiving coil is less than a third deviation threshold; wherein the fourth spacing is a spacing of the wireless charging transmitting coils corresponding to the wireless charging receiving coil.

Further, a preferred technical solution provided by the present invention is:

The deviation between the fifth pitch and the sixth pitch of the wireless charging receiving coil is less than a fourth deviation threshold;

The fifth spacing is a distance between the wireless charging receiving coil and a wireless charging transmitting coil corresponding thereto; and the sixth spacing is when the wireless charging receiving coil and the corresponding wireless charging transmitting coil are coaxially placed The best transmission distance.

Further, a preferred technical solution provided by the present invention is:

The fourth deviation threshold is 3 cm.

In a third aspect, the technical solution of an electric vehicle in the present invention is:

The electric vehicle includes a power battery charging interface and the wireless charging device described in the second technical solution;

The wireless charging device is disposed on a chassis of the electric vehicle and connected to the power battery charging interface for generating magnetic coupling resonance with a wireless charging transmitting coil disposed in a preset power supply region to a power battery of the electric vehicle Charging.

In a fourth aspect, the technical solution of the working coil switching method of the first multi-coil charging device of the present invention is:

The multi-coil charging device includes the wireless charging device according to the above first aspect, and the working coil switching method includes:

Controlling each wireless charging transmitting coil to sequentially supply power to the wireless charging receiving coil;

Detecting a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and calculating a phase difference between the resonant voltage and the resonant current;

Comparing the phase differences of the wireless charging transmitting coils, and controlling the wireless charging transmitting coils having the smallest phase difference to supply power to the wireless charging receiving coils.

In a fifth aspect, the technical solution of the working coil switching method of the second multi-coil charging device of the present invention is:

The multi-coil charging device includes the wireless charging device according to the second technical solution, and the working coil switching method includes:

Controlling each wireless charging receiving coil to sequentially supply power to the load;

Detecting a resonant voltage and a resonant current when the wireless charging receiving coils supply power to the load, and calculating a phase difference between the resonant voltage and the resonant current;

The phase difference of each of the wireless charging receiving coils is compared, and the wireless charging receiving coil having the smallest phase difference is controlled to supply power to the load.

In a sixth aspect, the technical solution of a charging station in the present invention is:

The charging station includes an electric vehicle charging position and the wireless charging device described in the first technical solution;

The wireless charging device is disposed at the electric vehicle charging position for generating magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery.

In a seventh aspect, the technical solution of a smart garage in the present invention is:

The charging station includes a parking space and the wireless charging device described in the first technical solution;

The wireless charging device is disposed at the parking space for generating a magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery.

Compared with the prior art, the above technical solution has at least the following beneficial effects:

1. The first wireless charging device provided by the present invention comprises a plurality of wireless charging transmitting coils arranged in parallel according to a preset interval, which can ensure that the wireless charging transmitting coil is changed when the position of the wireless charging receiving coil corresponding to the wireless charging transmitting coil changes. The distance from the wireless charging receiving coil can reach the set wireless charging distance, that is, the power transmission can be performed according to the maximum power transmission efficiency;

2. The second wireless charging device provided by the present invention comprises a plurality of wireless charging receiving coils arranged in parallel according to a preset interval, which can ensure wireless charging reception when the position of the wireless charging transmitting coil corresponding to the wireless charging receiving coil changes. The distance between the coil and the wireless charging transmitting coil can reach a set wireless charging distance, that is, the power transmission can be performed according to the maximum power transmission efficiency;

3. An electric vehicle according to the present invention, comprising the wireless charging device according to the second technical solution, which can realize wireless charging with maximum power transmission efficiency for an electric vehicle having different chassis heights;

4. A working coil switching method for a multi-coil charging device according to the present invention, which determines a wireless charging transmitting coil having the highest power transmission efficiency among a plurality of wireless charging transmitting coils according to a phase difference of a resonant voltage and a resonant current as a switching criterion. Easy to operate and high accuracy;

5. The working coil switching method of a multi-coil charging device according to the present invention, which determines a wireless charging receiving coil having the highest power transmission efficiency among a plurality of wireless charging receiving coils according to a switching criterion of a resonance voltage and a resonant current. Easy to operate and high accuracy;

6. A charging station according to the present invention, comprising the wireless charging device according to the first aspect of the present invention, which can achieve maximum power for an electric vehicle having different chassis heights. The wireless charging rate of the transmission efficiency improves the utilization rate of the charging position of the electric vehicle and reduces the construction cost of the charging station;

7. The smart garage provided by the present invention, comprising the wireless charging device according to the first technical solution, which can realize wireless charging of maximum power transmission efficiency for electric vehicles with different chassis heights, thereby saving electric vehicle users. The charging time also increases the construction cost of the garage with the electric vehicle charging function.

DRAWINGS

1 is a schematic diagram of a magnetically coupled resonant wireless charging in an embodiment of the present invention;

2 is a schematic diagram of laying a wireless charging transmitting coil according to an embodiment of the present invention;

3 is a schematic diagram showing the position of a wireless charging transmitting coil and a wireless charging receiving coil according to an embodiment of the present invention;

4 is a schematic diagram of power transmission of a wireless charging transmitting coil according to an embodiment of the present invention;

FIG. 5 is a schematic diagram showing the position of another wireless charging transmitting coil and a wireless charging receiving coil according to an embodiment of the present invention; FIG.

6 is a schematic diagram of an electric vehicle charged by the wireless charging transmitting coil shown in FIG. 4;

7 is a schematic diagram of power transmission of another wireless charging transmitting coil in an embodiment of the present invention;

FIG. 8 is a schematic diagram showing the position of another wireless charging transmitting coil and a wireless charging receiving coil according to an embodiment of the present invention; FIG.

Figure 9 is a schematic diagram of an electric vehicle charged by the wireless charging transmitting coil shown in Figure 7;

10 is a flowchart of implementing a method for switching a wireless charging transmitting coil according to an embodiment of the present invention;

11 is a schematic diagram showing the position of a wireless charging transmitting coil and a wireless charging receiving coil according to an embodiment of the present invention;

12 is a schematic structural diagram of a first phase detecting module according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a second phase detecting module according to an embodiment of the present invention; FIG.

Wherein: 1: first wireless charging receiving coil; 2: second wireless charging receiving coil; 3: first wireless charging transmitting coil; 4: second wireless charging transmitting coil; 5: third none Line charging receiving coil; 6: fourth wireless charging receiving coil; 7: third wireless charging transmitting coil; 8: fourth wireless charging transmitting coil; 91: first coil switching unit; 92: first phase calculating unit; First phase comparison unit; 101: second coil switching unit; 102: second phase calculation unit; 103: second phase comparison unit.

detailed description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the scope of the present invention.

In order to obtain the maximum power transmission efficiency of the wireless charging mode, it is necessary to ensure that the distance between the wireless charging transmitting coil and the wireless charging receiving coil is kept within a certain range, and the wireless charging transmitting coil/wireless charging receiving coil can only be adjusted when fixed in a certain area. The position of the corresponding wireless charging receiving coil/wireless charging transmitting coil enables the maximum power transmission efficiency to be achieved when the wireless charging transmitting coil and the wireless charging receiving coil perform power transmission. However, the wireless charging transmitting coil/wireless charging receiving coil must be dynamically adjusted by an external servo device, and the adjustment accuracy of the wireless charging transmitting coil/non-charging receiving coil is greatly affected by the reliability of the external servo device, and the wireless charging transmitting coil cannot be guaranteed. The wireless charging receiving coil can perform power transmission according to the maximum power transmission efficiency. Considering that the optimal transmission distance between the wireless charging transmitting coil and the wireless charging receiving coil having the same structure is a fixed value, the present invention provides a wireless based on a plurality of wireless charging transmitting coils/wireless charging receiving coils having the same structure. The charging device selects a plurality of wireless charging transmitting coils/wireless charging receiving coils to be optimally spaced from the wireless charging receiving coils/wireless charging transmitting coils by arranging a plurality of wireless charging transmitting coils/wireless charging receiving coils in parallel according to a certain interval. The wireless charging transmitting coil/wireless charging receiving coil within the transmission distance serves as the best wireless charging transmitting coil/best wireless charging receiving coil through the optimal wireless charging transmitting coil/best wireless charging receiving coil and wireless charging receiving coil/wireless The charging transmission coil performs power transmission to achieve maximum power transmission efficiency.

A wireless charging device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

The wireless charging device in this embodiment may include at least two wireless charging transmitting coils and one first phase detecting module. The wireless charging transmitting coil can be used for generating magnetic coupling resonance with the wireless charging receiving coil disposed at different positions of the preset power supply region for power transmission; the first phase detecting module can be configured to detect each wireless charging transmitting coil to receive wireless charging The phase difference between the resonant voltage and the resonant current when the coil is powered, and the wireless charging transmitting coil that controls the minimum phase difference supplies power to the wireless charging receiving coil.

Further, the wireless charging device in this embodiment may include a rectifier module and an inverter module. The AC side of the rectifier module may be connected to the AC power source, the DC side is connected to the DC side of the inverter module, and the AC side of the inverter module is respectively connected to each other. The wireless charging transmitting coils are connected in parallel. In this embodiment, the rectifier module can be used to convert the AC power source into a DC power source, and the inverter module is configured to perform high frequency inverter on the DC power output of the rectifier module, and output the AC power source obtained by the high frequency inverter to the wireless charging transmitter. The coil and the wireless charging transmitting coil can generate magnetic coupling resonance according to the AC power output of the inverter and the wireless charging receiving coil mounted on the load to perform power transmission.

Further, in the embodiment, the plurality of wireless charging transmitting coils in the wireless charging device may be arranged in parallel according to a preset interval. For example, the wireless charging transmitting coils may be parallelly arranged in a preset power supply area according to a preset spacing, such as electric charging station. Car charging position.

The preset spacing of the wireless charging transmitting coils in this embodiment may be the same or different. For example, when the wireless charging device includes the wireless charging transmitting coil A1, the wireless charging transmitting coil B1, and the wireless charging transmitting coil C1, the wireless charging transmitting coil A1, the wireless charging transmitting coil B1, and the wireless charging transmitting coil C1 are sequentially disposed in parallel, and the wireless charging transmitting coil is sequentially disposed. The distance between A1 and the wireless charging transmitting coil B1, the spacing between the wireless charging transmitting coil B1 and the wireless charging transmitting coil C1 may be the same or different.

In this embodiment, the wireless charging transmitting coil can be disposed on a preset power supply area, where the preset power supply area refers to an area where the wireless receiving coil performs charging. The preset power supply area of the wireless charging transmitting coil may be the ground or a charging platform disposed on the ground. The plurality of wireless charging transmitting coils are arranged in parallel in the preset power supply area according to the preset spacing, which means that the wireless charging transmitting coils are sequentially laid in the vertical direction according to a certain height difference in the area below the plane of the preset power supply area. Different locations. For example, when the preset power supply area is the ground, a plurality of wireless charging transmitting coils may be buried in different depths of the ground from bottom to top. The preset power supply area is a charging platform disposed on the ground, and the charging platform has a certain height, and a plurality of wireless charging transmitting coils may be sequentially laid down from the bottom to the top in an area between the charging platform and the ground, or a part of the wireless The charging transmitting coils are laid down in the region between the charging platform and the ground from bottom to top, and the remaining wireless charging transmitting coils are buried in different depths of the ground from bottom to top.

In this embodiment, in order to ensure that the wireless charging transmitting coil and the wireless charging receiving coil can reliably perform power transmission, each wireless charging transmitting coil is respectively provided with a first switch for controlling the wireless charging transmitting coil, and the first switch is used according to the setting. The predetermined first wireless charging distance selectively turns on the selected wireless charging transmitting coil.

The spacing between the wireless charging transmitting coil and its corresponding wireless charging receiving coil in this embodiment may be as shown in the following formula (1):

c=D+d _s (1)

The meaning of each parameter in formula (1) is: c is the optimal transmission distance when the wireless charging transmitting coil is coaxially placed with its corresponding wireless charging receiving coil; d _s is the spacing of two adjacent wireless charging transmitting coils; The distance between the wireless charging receiving coil corresponding to the wireless charging transmitting coil on the lower side of the two adjacent wireless charging transmitting coils and the wireless charging transmitting coil on the upper side. For example, the wireless charging transmitting coil A and the wireless charging transmitting coil B are two adjacent wireless charging transmitting coils, the wireless charging transmitting coil A is on the lower side, the wireless charging transmitting coil B is on the upper side, and the wireless charging transmitting coil A and the wireless The charging transmitting coils B correspond to the wireless charging receiving coil C and the wireless charging receiving coil D, respectively, and the parameter D represents the distance between the wireless charging receiving coil C and the wireless charging transmitting coil B. In the embodiment, the wireless charging receiving coil corresponding to the wireless charging transmitting coil refers to the maximum power transmission efficiency when the wireless charging transmitting coil and the wireless charging receiving coil perform power transmission, and the wireless charging transmitting coil corresponding to the wireless charging receiving coil The maximum power transmission efficiency can be achieved when the wireless charging transmitting coil and the wireless charging receiving coil perform power transmission. The optimal transmission distance refers to the distance between the wireless charging transmitting coil and its corresponding wireless charging receiving coil and the maximum power transmission efficiency. Meanwhile, in the embodiment, the optimal transmission distance is tested and measured, and it can be determined that the optimal transmission distance has a certain deviation range, and the power and power transmission efficiency of the wireless charging transmitting coil and its corresponding wireless charging receiving coil are within the deviation range. The rate of change with distance is small. Therefore, the maximum power transmission efficiency can be achieved when the deviation between the second pitch and the third pitch of the wireless charging transmitting coil is less than the second deviation threshold, wherein the second spacing is the spacing between the wireless charging transmitting coil and the corresponding wireless charging receiving coil. The third spacing is the optimal transmission distance when the wireless charging transmitting coil and its corresponding wireless charging transmitting coil are placed coaxially.

The spacing of two adjacent wireless charging transmitting coils in this embodiment is as shown in the following formula (2):

d _s ≈d _r12 (2)

The meaning of the parameter d _r12 in the formula (2) is the spacing of the wireless charging receiving coils corresponding to the two adjacent wireless charging transmitting coils, for example, the wireless charging transmitting coil is disposed on the chassis of the electric vehicle, and the wireless charging transmitting coil spacing d _r12 The value can be determined based on the spacing of the two electric vehicle chassis. That is, the first preset spacing of the wireless charging transmitting coil and the spacing of the wireless charging receiving coil corresponding to the wireless charging transmitting coil may be equal or not equal, for example, the first preset spacing of the wireless charging transmitting coil and the first The deviation of a pitch is less than the first deviation threshold, wherein the first pitch is a pitch of the wireless charging receiving coil corresponding to the wireless charging transmitting coil.

Further, the first phase detecting module in this embodiment may include the following structures, and specifically includes:

FIG. 12 exemplarily shows the structure of the first phase detecting module in this embodiment. As shown in the figure, the first phase detecting module in this embodiment may include a first coil switching unit 91, a first phase calculating unit 92, and a A phase comparison unit 93.

The first coil switching unit 91 can be used to sequentially control each wireless charging transmitting coil to supply power to the wireless charging receiving coil. Specifically, in the embodiment, the first coil switching unit 91 can control the first switch of one wireless charging transmitting coil coil to be connected in series, and the first switches of the other wireless charging transmitting coil coils are connected in series to realize the respective wireless charging transmitting coils respectively. Power is supplied to the wireless charging receiver. For example, when the wireless charging device includes the wireless charging transmitting coil A1 and the wireless charging transmitting coil B1, first, the first switch of the wireless charging transmitting coil A1 is first closed, and the first switch of the wireless charging transmitting coil B1 is turned off, so that the wireless charging is transmitted. The coil A1 can supply power to the wireless charging receiving coil; then, the first switch of the wireless charging transmitting coil B1 is closed, and the first switch of the wireless charging transmitting coil A1 is turned off, so that the wireless charging transmitting coil B1 can supply power to the wireless charging receiving coil.

The first phase calculating unit 92 can be configured to detect a resonant voltage and a resonant current when each wireless charging transmitting coil supplies power to the wireless charging receiving coil, and calculate a phase difference between the resonant voltage and the resonant current. Specifically, in the embodiment, the wireless charging transmitting coil and the wireless charging receiving coil can generate magnetic coupling resonance, so the resonant voltage and the resonant current exist in the wireless charging transmitting coil, and the wireless charging can be determined when the phase difference between the resonant voltage and the resonant current is minimum. The maximum power transmission efficiency can be achieved by the distance between the transmitting coil and the wireless charging receiving coil being close to or within the optimal transmission distance. For example, after the first coil switching unit 91 controls the wireless charging transmitting coil A1 and the wireless charging receiving coil to perform power transmission, the phase of the resonant voltage and the resonant current of the wireless charging transmitting coil A1 can be calculated by the first phase calculating unit 92. The difference in position. After the first coil switching unit 91 controls the wireless charging transmitting coil B1 and the wireless charging receiving coil to perform power transmission, the phase difference between the resonant voltage and the resonant current of the wireless charging transmitting coil B1 can be calculated by the first phase calculating unit 92. After the first coil switching unit 91 controls the wireless charging receiving coil A2 and the wireless charging transmitting coil to perform power transmission, the phase difference between the resonant voltage and the resonant current of the wireless charging receiving coil A2 can be calculated by the first phase calculating unit 92. After the first coil switching unit 91 controls the wireless charging receiving coil B2 and the wireless charging transmitting coil to perform power transmission, the phase difference between the resonant voltage and the resonant current of the wireless charging receiving coil B2 can be calculated by the first phase calculating unit 92.

The first phase comparison unit 93 can be configured to compare the phase difference of each wireless charging transmitting coil, and control the wireless charging transmitting coil with the smallest phase difference to supply power to the wireless charging receiving coil. In this embodiment, the phase difference of each wireless charging transmitting coil can be compared according to the following two embodiments:

First Embodiment: After the first phase calculating unit 92 calculates the phase difference of all the wireless charging transmitting coils, the first phase comparing unit 93 first sorts the phase differences in order of small to large or large to small, and then The minimum phase difference in the phase difference sequence is selected, and finally the wireless charging transmitting coil corresponding to the minimum phase difference is controlled to supply power to the wireless charging receiving coil.

Second Embodiment: The first phase comparison unit 93 compares the phase difference and the previous phase difference each time the first phase calculation unit 92 calculates a phase difference, and selects a smaller phase difference to perform the next phase difference. In one round of comparison, until the first phase calculating unit 92 completes the phase difference calculation of all the wireless charging transmitting coils, the minimum phase difference is obtained, and finally the wireless charging transmitting coil corresponding to the minimum phase difference is controlled to supply power to the wireless charging receiving coil.

In this embodiment, the first phase detecting module can implement adaptive switching of multiple wireless charging transmitting coils in the wireless charging device.

The wireless charging device in this embodiment may include at least two wireless charging receiving coils and one second phase detecting module. The wireless charging and receiving ring can be used for generating magnetic coupling resonance with the wireless charging transmitting coil disposed at different positions in the preset power supply region for power transmission; the second phase detecting module can be used for detecting each wireless charging receiving coil to the load, such as to be charged In an electric vehicle, the phase difference between the resonant voltage and the resonant current during power supply is controlled, and the wireless charging transmitting coil having the smallest phase difference is controlled to supply power to the electric vehicle to be charged.

Further, in this embodiment, the wireless charging device can be a rectifier module, and the AC side of the rectifier module can be connected in parallel with each wireless charging receiving coil, and the DC side is connected to the load, and the wireless charging receiving coil can be connected to the load according to the power transmitted by the wireless charging transmitting coil. Charging.

Further, in the embodiment, the plurality of wireless charging receiving coils in the wireless charging device may be arranged in parallel according to the second preset interval. For example, the wireless charging receiving coil may be parallelly disposed on the load according to a preset interval, such as an electric vehicle chassis. .

The preset spacing of the wireless charging receiving coils in this embodiment may be the same or different. For example, when the wireless charging device includes the wireless charging receiving coil A2, the wireless charging receiving coil B2, and the wireless charging receiving coil C2, the wireless charging receiving coil A2, the wireless charging receiving coil B2, and the wireless charging receiving coil C2 are sequentially disposed in parallel, and the wireless charging receiving coil is sequentially disposed. The distance between A2 and the wireless charging receiving coil B2, the spacing between the wireless charging receiving coil B2 and the wireless charging receiving coil C2 may be the same or different.

In this embodiment, the wireless charging receiving coil can be disposed on a preset power supply area, where the preset power supply area refers to an area where the load is charged. The preset power supply area of the wireless charging receiving coil may be set in a certain area of the load. For example, when the load is an electric vehicle, the preset power supply area of the wireless charging receiving coil may be the chassis of the electric vehicle. And the plurality of wireless charging receiving coils are arranged in parallel in the preset power supply area according to the preset spacing, which means that the wireless charging receiving coils are sequentially disposed on the load, for example, the wireless charging receiving coils can be set in the vertical direction according to the setting. The height difference is sequentially arranged in parallel on the chassis of the electric vehicle.

In this embodiment, in order to ensure that the wireless charging transmitting coil and the wireless charging receiving coil can reliably perform power transmission, each wireless charging receiving coil is respectively provided with a second switch for controlling the on/off of the wireless charging receiving coil, and the second switch is used for The selected wireless charging receiving coil is selectively turned on according to the set second wireless charging distance. The spacing between the wireless charging receiving coil and the corresponding wireless charging transmitting coil in this embodiment is similar to the method for determining the spacing of the formula (1) described in the above wireless charging device technical solution, and the spacing between two adjacent wireless charging receiving coils The formula (1) described in the above technical solution of the wireless charging device is similar to the method for determining the spacing. For the convenience and simplicity of the description, the method for determining the spacing of the wireless charging receiving coil and the wireless charging transmitting coil corresponding thereto in the embodiment, two phases For the specific working process of the method for determining the spacing of the adjacent wireless charging receiving coils and the related description, reference may be made to the corresponding process in the foregoing wireless charging device embodiment, and details are not described herein again.

Further, the second phase detecting module in this embodiment may include the following structures, and specifically includes:

FIG. 13 exemplarily shows the structure of the second phase detecting module in this embodiment. As shown in the figure, the second phase detecting module in this embodiment may include a second coil switching unit 101, a second phase calculating unit 102, and a Two phase comparison unit 103.

The second coil switching unit 101 can be used to sequentially control each wireless charging receiving coil to supply power to the load. Specifically, in the embodiment, the second coil switching unit 91 can control the second switch in series with one wireless charging receiving coil to be closed, and the second switches in series with the other wireless charging receiving coils are disconnected, so that each wireless charging receiving coil is respectively connected to the load. powered by. For example, when the wireless charging device includes the wireless charging receiving coil A2 and the wireless charging receiving coil B2, first, the second switch of the wireless charging receiving coil A2 is first closed, and the second switch of the wireless charging receiving coil B2 is turned off, so that the wireless charging is received. The coil A2 can supply power to the load; then the second switch of the wireless charging receiving coil B2 is closed, and the second switch of the wireless charging receiving coil A2 is turned off, so that the wireless charging receiving coil B2 can supply power to the load.

The second phase calculating unit 102 can be configured to detect a resonant voltage and a resonant current when each wireless charging receiving coil supplies power to the load, and calculate a phase difference between the resonant voltage and the resonant current. Specifically, in the embodiment, the wireless charging transmitting coil and the wireless charging receiving coil can generate magnetic coupling resonance, so the resonant voltage and the resonant current exist in the wireless charging receiving coil, and the wireless charging can be determined when the phase difference between the resonant voltage and the resonant current is minimum. The maximum power transmission efficiency can be achieved by the distance between the transmitting coil and the wireless charging receiving coil being close to or within the optimal transmission distance. For example, after the second coil switching unit 101 controls the wireless charging receiving coil A2 and the wireless charging transmitting coil to perform power transmission, the phase difference between the resonant voltage and the resonant current of the wireless charging receiving coil A2 can be calculated by the second phase calculating unit 102. After the second coil switching unit 101 controls the wireless charging receiving coil B2 and the wireless charging transmitting coil to perform power transmission, the phase difference between the resonant voltage and the resonant current of the wireless charging receiving coil B2 can be calculated by the second phase calculating unit 102.

The second phase comparison unit 103 can be used to compare the phase difference of each wireless charging receiving coil and control the wireless charging receiving coil with the smallest phase difference to supply power to the load. In this embodiment, the phase difference of the wireless charging receiving coil can be compared according to the following two embodiments:

First Embodiment: After the second phase calculating unit 102 calculates the phase difference of all the wireless charging receiving coils, the second phase comparing unit 103 first sorts the phase differences in order of small to large or large to small, and then The minimum phase difference in the phase difference sequence is selected, and finally the wireless charging receiving coil corresponding to the minimum phase difference is controlled to supply power to the load.

Second Embodiment: The second phase comparison unit 103 compares the phase difference and the previous phase difference each time the second phase calculation unit 102 calculates a phase difference, and selects a smaller phase difference to perform the next phase difference. In one round of comparison, until the second phase calculating unit 102 completes the phase difference calculation of all the wireless charging receiving coils, the minimum phase difference is obtained, and finally the wireless charging receiving coil corresponding to the minimum phase difference is controlled to supply power to the load.

In this embodiment, the second phase detecting module can implement adaptive switching of multiple wireless charging receiving coils in the wireless charging device.

It can be understood by those skilled in the art that the first phase detecting module and the second phase detecting module further include some other well-known structures, such as a processor, a controller, a memory, etc., wherein the memory includes but is not limited to random access memory, flash memory, and read only. Memory, programmable read only memory, volatile memory, nonvolatile memory, serial memory, parallel memory or registers, etc., including but not limited to CPLD/FPGA, DSP, ARM processor, MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in FIGS. 12 and 13.

It should be understood that the number of individual units in Figures 12 and 13 is merely illustrative. Each unit can have any number according to actual needs.

Further, an embodiment of the present invention provides a preferred technical solution of a wireless charging device. The wireless charging device will be specifically described below with reference to the accompanying drawings.

FIG. 2 exemplarily shows a schematic diagram of laying a wireless charging transmitting coil in this embodiment. As shown in the figure, in the embodiment, the wireless charging device includes a first wireless charging transmitting coil 3 and a second wireless charging transmitting coil 4, and the first wireless The charging transmitting coil 3 can be used to generate magnetic coupling resonance with a wireless charging receiving coil mounted on a first type electric vehicle and achieve maximum power transmission efficiency, and the second wireless charging transmitting coil 4 can be used for mounting with a second type electric vehicle The wireless charging receiving coil on the above generates magnetic coupling resonance and achieves maximum power transmission efficiency.

Wherein, the chassis height of the first type electric vehicle is greater than the chassis height of the second type electric vehicle, and the chassis spacing of the two electric vehicles is d. The second wireless charging transmitting coil 4 and the first wireless charging transmitting coil 3 are disposed in parallel on the ground side at a preset pitch, that is, the depth of the second wireless charging transmitting coil 4 is greater than the depth of the first wireless charging transmitting coil 3. At the same time, the distance between the first wireless charging transmitting coil 3 and the second wireless charging transmitting coil 4 is d.

FIG. 3 exemplarily shows the position of the wireless charging transmitting coil and the wireless charging receiving coil in the embodiment, as shown in the figure, the first wireless charging transmitting coil 3 and the first type on the first type of electric vehicle in this embodiment. The pitch of the wireless charging receiving coil 1 is D+d, and the distance between the second wireless charging transmitting coil 4 and the second wireless charging receiving coil 2 on the second type of electric vehicle is also D+d. Meanwhile, in the embodiment, the optimal transmission distance between the wireless charging transmitting coil and the wireless charging receiving coil is c=D+d, and the preset threshold of the optimal transmission distance is 3 cm, and the wireless charging transmitting coil is in the range of c±3 cm. Maximum power transfer efficiency can be achieved with the wireless charging receiving coil.

FIG. 1 exemplarily shows a magnetic coupling resonant wireless charging principle in the embodiment of the present invention. As shown in the figure, the inverter module in this embodiment includes a full bridge type inverse composed of power electronic devices T1, T2, T3, and T4. The variable unit, the DC side of the full bridge type inverter unit is connected with the DC power source Vin, the AC side is connected in parallel with the wireless charging transmitting coils L1 and L2, the wireless charging transmitting coil L1 is connected in series with the switching switch K1, and the wireless charging transmitting coil L2 is switched. Switch K2 is connected in series. By setting the switch, the inverter can be connected to only one wireless charging transmitting coil at any time: when the switching switch K1 is closed and K2 is disconnected, the wireless charging transmitting coil L1 and the resonant capacitors C1 and C2 form a resonant cavity, which can be combined with wireless charging. The coil L3 generates a magnetic coupling resonance; when the switch K1 is turned off and K2 is closed, the wireless charging transmitting coil L2 and the resonant capacitors C1 and C2 form a resonant cavity, which can generate magnetic coupling resonance with the wireless charging receiving coil L3. The wireless charging receiving coil L3 can be connected to a full bridge type rectifying unit composed of diodes D1, D2, D3 and D4, and the full bridge type rectifying unit can convert the AC power transmitted by the wireless charging receiving coil L3 into a DC power source, Stored on the power battery of the electric car.

The working process of the first phase detecting module in the wireless charging device in this embodiment is:

First Embodiment: In this embodiment, the first type of electric vehicle is set to travel to a preset power supply area for charging.

FIG. 10 exemplarily shows an implementation flow of a wireless charging and transmitting coil switching method in this embodiment. As shown in the figure, in the embodiment, the first phase detecting module can perform the wireless charging and transmitting coil switching according to the following steps, which specifically includes:

Step S101: The first coil switching unit 91 first closes the first switch of the first wireless charging transmitting coil 3, turns off the first switch of the second wireless charging transmitting coil 4, and the first wireless charging transmitting coil 3 and the first type of electric vehicle The first wireless charging receiving coil 1 on the above generates magnetic coupling resonance for power transmission.

FIG. 4 exemplarily shows the power transmission principle of the wireless charging transmitting coil in this embodiment. As shown in the figure, in the embodiment, the first coil switching unit 91 first closes the first switch of the wireless charging transmitting coil L1, and disconnects the wireless charging. The first switch of the transmitting coil L2, the wireless charging transmitting coil L1 and the wireless charging receiving coil L3 generate magnetic coupling resonance for power transmission.

Step S102: The first phase calculating unit 92 detects a phase difference between the resonant voltage of the first wireless charging transmitting coil 3 and the resonant current.

Step S103: After the first phase calculating unit 92 completes the phase difference detection, the first coil switching unit 91 turns off the first switch of the first wireless charging transmitting coil 3, closes the first switch of the second wireless charging transmitting coil 4, and second The wireless charging transmitting coil 4 and the first wireless charging receiving coil 1 generate magnetic coupling resonance for power transmission.

FIG. 7 exemplarily shows the principle of power transmission of the wireless charging transmitting coil in this embodiment. As shown in FIG. 7, in the embodiment, the first coil switching unit 91 first disconnects the first switch of the wireless charging transmitting coil L1, and closes the wireless. The first switch of the charging transmitting coil L2, the wireless charging transmitting coil L2 and the wireless charging receiving coil L3 generate magnetic coupling resonance for power transmission.

Step S104: The first phase calculating unit 92 detects a phase difference between the resonant voltage of the second wireless charging transmitting coil 4 and the resonant current.

Step S105: The first phase comparison unit 93 compares the phase differences of the first wireless charging transmitting coil 3 and the second wireless charging transmitting coil 4. In this embodiment, the phase difference of the first wireless charging transmitting coil 3 is smaller than the phase difference of the second wireless charging transmitting coil 4, so the first wireless charging transmitting coil 3 is the optimal wireless charging transmitting coil, and the first phase comparing unit 93 at this time Controlling the first coil switching unit 91 to disconnect the first switch of the second wireless charging transmitting coil 4, closing the first switch of the first wireless charging transmitting coil 3, the first wireless charging transmitting coil 3 and the first type of electric vehicle A wireless charging receiving coil 1 generates magnetic coupling resonance for power transmission.

FIG. 5 exemplarily shows a schematic diagram of the position of the wireless charging transmitting coil and the wireless charging receiving coil in the embodiment, and FIG. 6 exemplarily shows a schematic diagram of the electric vehicle charged by the first wireless charging transmitting coil 3, as shown in the figure. In this embodiment, the first wireless charging transmitting coil 3 and the first wireless charging receiving coil 1 perform power transmission to charge the first type of electric vehicle, and the distance between the first wireless charging transmitting coil 3 and the first wireless charging receiving coil 1 is D. +d, as described above, the wireless charging transmitting coil and the wireless charging receiving coil in this embodiment The optimal transmission distance is D+d, so the maximum wireless transmission efficiency can be achieved by using the first wireless charging transmitting coil 3 for power transmission.

Second Embodiment: In this embodiment, the second type electric vehicle is set to travel to a preset power supply area for charging.

Step S101: The first coil switching unit 91 first closes the first switch of the first wireless charging transmitting coil 3, turns off the first switch of the second wireless charging transmitting coil 4, the first wireless charging transmitting coil 3 and the second type of electric vehicle The second wireless charging receiving coil 2 on the above generates magnetic coupling resonance for power transmission.

Step S103: After the first phase calculating unit 92 completes the phase difference detection, the first coil switching unit 91 turns off the first switch of the first wireless charging transmitting coil 3, closes the first switch of the second wireless charging transmitting coil 4, and second The wireless charging transmitting coil 4 and the second wireless charging receiving coil 2 generate magnetic coupling resonance for power transmission.

Step S105: The first phase comparison unit 93 compares the phase differences of the first wireless charging transmitting coil 3 and the second wireless charging transmitting coil 4. In this embodiment, the phase difference of the first wireless charging transmitting coil 3 is greater than the phase difference of the second wireless charging transmitting coil 4, so the second The line charging transmitting coil 4 is an optimal wireless charging transmitting coil, at which time the phase comparing unit 93 controls the second wireless charging transmitting coil 4 to charge the second type of electric vehicle.

FIG. 8 exemplarily shows a positional diagram of a wireless charging transmitting coil and a wireless charging receiving coil in the embodiment, and FIG. 9 exemplarily shows a schematic diagram of an electric vehicle that is charged by using the second wireless charging transmitting coil 4, as shown in the figure. In this embodiment, the second wireless charging transmitting coil 4 and the second wireless charging receiving coil 2 perform power transmission to charge the second type electric vehicle, and the distance between the second wireless charging transmitting coil 4 and the second wireless charging receiving coil 2 is D. +d, as can be seen from the foregoing, the optimal transmission distance between the wireless charging transmitting coil and the wireless charging receiving coil in this embodiment is D+d, so that the second wireless charging transmitting coil 4 can be used for power transmission to achieve maximum power transmission efficiency. .

In the above embodiment, although the steps are described in the above-described order, those skilled in the art can understand that in order to implement the effects of the embodiment, different steps need not be performed in this order, which can be simultaneously ( Performed in parallel or in reverse order, these simple variations are within the scope of the invention.

Further, the embodiment of the present invention further provides a preferred technical solution of another wireless charging device. The wireless charging device will be specifically described below with reference to the accompanying drawings.

The wireless charging device in this embodiment includes four wireless charging transmitting coils, that is, four types of electric vehicles can be charged. Specifically include:

FIG. 11 is a schematic diagram showing the position of the wireless charging transmitting coil and the wireless charging receiving coil in the embodiment. As shown in the figure, the wireless charging device in the embodiment includes a first wireless charging transmitting coil 3 and a second wireless charging transmission. The coil 4, the third wireless charging transmitting coil 7, and the fourth wireless charging transmitting coil 8.

Wherein, the first wireless charging transmitting coil 3 can be used to generate magnetic coupling resonance with the first wireless charging receiving coil 1 mounted on the first type electric vehicle and achieve maximum power transmission efficiency, and the second wireless charging transmitting coil 4 can be used for The second wireless charging receiving coil 2 mounted on the second type of electric vehicle generates magnetic coupling resonance and achieves maximum power transmission efficiency, and the third wireless charging transmitting coil 7 can be used for the third type mounted on the third type electric vehicle The wireless charging receiving coil 5 generates magnetic coupling resonance and achieves maximum power transmission efficiency, and the fourth wireless charging transmitting coil 8 can be used to generate magnetic coupling resonance with the fourth wireless charging receiving coil 6 mounted on the second type electric vehicle and achieve maximum Power transfer efficiency.

Wherein, the chassis height of the first type electric vehicle is greater than the chassis height of the second type electric vehicle, and the chassis spacing of the two electric vehicles is d1. The chassis height of the third type of electric vehicle is greater than the chassis height of the fourth type of electric vehicle, and the chassis spacing of the two electric vehicles is d2.

The first wireless charging transmitting coil 3, the second wireless charging transmitting coil 4, the third wireless charging transmitting coil 7 and the fourth wireless charging transmitting coil 8 are arranged in parallel on the ground side according to a preset interval, that is, the first wireless charging transmission. The depths of the coil 3, the second wireless charging transmitting coil 4, the third wireless charging transmitting coil 7, and the fourth wireless charging transmitting coil 8 are gradually increased. Meanwhile, the distance between the first wireless charging transmitting coil 3 and the second wireless charging transmitting coil 4 is d1, and the distance between the third wireless charging transmitting coil 7 and the fourth wireless charging transmitting coil 8 is d2.

Wherein, the distance between the first wireless charging transmitting coil 3 and the first wireless charging receiving coil 1 on the first type electric vehicle is D1+d1, and the second wireless charging transmitting coil 4 and the second wireless charging on the second type electric vehicle The spacing of the receiving coil 2 is also D1+d1; the distance between the third wireless charging transmitting coil 7 and the third wireless charging receiving coil 5 on the third type electric vehicle is D2+d2, and the fourth wireless charging transmitting coil 8 and the fourth The pitch of the fourth wireless charging receiving coil 6 on the type of electric vehicle is also D2+d2. Meanwhile, in the embodiment, the optimal transmission distance between the wireless charging transmitting coil and the wireless charging receiving coil is c=D1+d1=D2+d2, and the preset threshold of the optimal transmission distance is 3 cm, in the range of c±3 cm, Both the wireless charging transmitting coil and the wireless charging receiving coil can achieve maximum power transmission efficiency.

The technical principle, the technical problem solved, and the technical effects of the wireless charging device in this embodiment are similar to those of the first wireless charging device embodiment described above, and those skilled in the art can clearly understand that it is convenient for the description. For the specific working process and related description of the wireless charging device in this embodiment, reference may be made to the corresponding process in the foregoing first embodiment of the wireless charging device, and details are not described herein again.

Those skilled in the art will appreciate that the modules in the devices in the embodiments can be adaptively changed and placed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and further they may be divided into a plurality of sub-modules or sub-units or sub-components. In addition to such features and/or at least some of the processes or units being mutually exclusive, any combination of the features disclosed in the specification, including the accompanying claims, the abstract and the drawings, and any methods so disclosed, or All processes or units of the device are combined. Unless In addition, it is expressly stated that each feature disclosed in the specification, including the accompanying claims, the abstract and the drawings, may be replaced by alternative features that provide the same, equivalent or similar purpose.

Further, the embodiment of the present invention further provides a working coil switching method of the multi-coil charging device, which may be the wireless charging device described in the first technical solution. In this embodiment, the working coil of the wireless charging device can be switched according to the following steps, including:

Step S201: Control each wireless charging transmitting coil to sequentially supply power to the wireless charging receiving coil.

Step S202: detecting a resonance voltage and a resonance current when each wireless charging transmitting coil supplies power to the wireless charging receiving coil, and calculating a phase difference between the resonant voltage and the resonant current.

Step S203: Comparing the phase difference of each wireless charging transmitting coil, and controlling the wireless charging transmitting coil with the smallest phase difference to supply power to the wireless charging receiving coil.

In the embodiment, the wireless charging transmitting coil is determined according to the phase difference of the resonant voltage and the resonant current as the switching criterion, and the wireless charging transmitting coil with the highest power transmission efficiency among the plurality of wireless charging transmitting coils is determined, and the operation is simple and easy to implement and the accuracy is better. high.

Further, the embodiment of the present invention further provides a working coil switching method of the multi-coil charging device, which may be the wireless charging device described in the second technical solution. In this embodiment, the working coil of the wireless charging device can be switched according to the following steps, including:

Step S301: Control each wireless charging receiving coil to sequentially supply power to the load.

Step S302: Detect a resonance voltage and a resonance current when each wireless charging receiving coil supplies power to the load, and calculate a phase difference between the resonant voltage and the resonant current.

Step S303: Comparing the phase difference of each wireless charging receiving coil, and controlling the wireless charging receiving coil with the smallest phase difference to supply power to the load.

In this embodiment, the wireless charging receiving coil is determined according to the phase difference of the resonant voltage and the resonant current in the wireless charging receiving coil, and the wireless charging receiving coil having the largest power transmission efficiency among the plurality of wireless charging receiving coils is determined, and the operation is simple and easy to implement and the accuracy is better. high.

Based on the above wireless charging device, an embodiment of the present invention further provides an electric vehicle. In this embodiment, the electric vehicle may include a power battery charging interface and the wireless charging device described in the second technical solution. The wireless charging device may be disposed on the chassis of the electric vehicle and connected to the power battery charging interface for generating a magnetic coupling resonance with the wireless charging transmitting coil disposed in the preset power supply region to charge the power battery of the electric vehicle. Among them, can be vertical The wireless charging receiving coils in the wireless charging device are arranged in parallel in the direct direction on the chassis of the electric vehicle according to the set height difference. In the embodiment, the electric vehicle charging system adopts a wireless charging device, which can wirelessly charge an electric vehicle having different chassis heights in the same preset power supply area, and can improve the utilization rate of the preset power supply area.

Based on the above wireless charging device, an embodiment of the present invention further provides a charging station. The charging station in this embodiment may include an electric vehicle charging position and the wireless charging device described in the above first aspect. The wireless charging device may be disposed at an electric vehicle charging position for generating a magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery. Wherein, the wireless charging receiving coils in the wireless charging device can be arranged in parallel in the vertical direction according to the set height difference in the charging position of the electric vehicle. In this embodiment, by setting the wireless charging device in the charging station, the utilization rate of the charging position of the electric vehicle can be reduced, and the construction cost of the charging station is reduced.

Based on the wireless charging device described above, an embodiment of the present invention further provides a smart garage. The smart garage in this embodiment may include a parking space and the wireless charging device described in the first technical solution described above. The wireless charging device may be disposed in a parking space for generating a magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery. Wherein, the wireless charging receiving coils in the wireless charging device can be parallelly arranged in the parking space according to the set height difference in the vertical direction. In the embodiment, by setting the wireless charging device in the smart garage, the wireless vehicle can be wirelessly charged during the parking process, and each parking space can also charge the electric vehicle with different chassis heights, thereby saving the electric vehicle user. The charging time also increases the construction cost of a garage with an electric vehicle charging function.

In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features that are included in other embodiments and not in other features, combinations of features of different embodiments are intended to be within the scope of the present invention. Different embodiments are formed and formed. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

The various component embodiments of the present invention may be implemented in hardware, or in a software module running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the servers, clients, in accordance with embodiments of the present invention. The invention may also be embodied as a device or device program (eg, a PC program and a PC program) for performing some or all of the methods described herein. Product). Such a program implementing the present invention may be stored on a PC readable medium or may have the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

It is to be noted that the above-described embodiments are illustrative of the invention and are not intended to be limiting, and that the invention may be devised without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as a limitation. The word "comprising" does not exclude the presence of the elements or steps that are not recited in the claims. The word "a" or "an" The invention can be implemented by means of hardware comprising several distinct elements and by means of a suitably programmed PC. In the unit claims enumerating several means, several of these means can be embodied by the same hardware item. The use of the words first, second, and third does not indicate any order. These words can be interpreted as names.

Heretofore, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings, but it is obvious to those skilled in the art that the scope of the present invention is obviously not limited to the specific embodiments. Those skilled in the art can make equivalent changes or substitutions to the related technical features without departing from the principles of the present invention, and the technical solutions after the modifications or replacements fall within the scope of the present invention.

Claims

A wireless charging device, characterized in that the device comprises:

At least two wireless charging transmitting coils, the wireless charging transmitting coils being arranged in parallel according to a first preset interval;

Each of the wireless charging transmitting coils is respectively provided with a first switch for controlling the on/off of the wireless charging transmitting coil, and the first switch is configured to select a selected wireless charging transmission according to the set first wireless charging distance. Coil.
The wireless charging device of claim 1 wherein:

The wireless charging transmitting coil performs power transmission according to a magnetic coupling resonance mode.
A wireless charging device according to claim 1 or 2, wherein

The device further includes a first phase detecting module, configured to detect a phase difference between a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and control the The wireless charging transmitting coil having the smallest phase difference supplies power to the wireless charging receiving coil.
The wireless charging device according to claim 3, wherein the first phase detecting module comprises a first coil switching unit, a first phase calculating unit and a first phase comparing unit;

The first coil switching unit is configured to control the wireless charging transmitting coils to sequentially supply power to the wireless charging receiving coil;

The first phase calculating unit is configured to detect a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and calculate a phase difference between the resonant voltage and the resonant current;

The first phase comparison unit is configured to compare phase differences of the wireless charging transmitting coils, and control the wireless charging transmitting coil with the smallest phase difference to supply power to the wireless charging receiving coil.
A wireless charging device according to claim 1 or 2, wherein

The deviation between the first preset pitch of the wireless charging transmitting coil and the first spacing is less than the first a deviation threshold; wherein the first spacing is a spacing of the wireless charging receiving coils corresponding to the wireless charging transmitting coils.
A wireless charging device according to claim 1 or 2, wherein

The deviation of the second pitch of the wireless charging transmitting coil from the third spacing is less than the second deviation threshold;

The second spacing is a distance between the wireless charging transmitting coil and a wireless charging receiving coil corresponding thereto; the third spacing is when the wireless charging transmitting coil and the corresponding wireless charging receiving coil are coaxially placed The best transmission distance.
The wireless charging device according to claim 6, wherein

The second deviation threshold is 3 cm.
A wireless charging device, characterized in that the device comprises:

At least two wireless charging receiving coils, the wireless charging receiving coils being arranged in parallel according to a second preset interval;

Each of the wireless charging and receiving coils is respectively provided with a second switch for controlling the on/off of the wireless charging receiving coil, and the second switch is configured to select a selected wireless charging and receiving according to the set second wireless charging distance. Coil.
The wireless charging device of claim 1 wherein:

The wireless charging receiving coil performs power transmission according to a magnetic coupling resonance mode.
A wireless charging device according to claim 8 or 9, wherein

The device further includes a second phase detecting module, configured to detect a phase difference between the resonant voltage and the resonant current when the wireless charging receiving coils supply power to the load, and control the phase difference to be minimum The wireless charging receiving coil supplies power to the load.
The wireless charging device according to claim 10, wherein the second phase detecting module comprises a second coil switching unit, a second phase calculating unit, and a second phase comparing unit;

The second coil switching unit is configured to control the wireless charging receiving coils to sequentially supply power to the load;

The second phase calculating unit is configured to detect a resonant voltage and a resonant current when the wireless charging receiving coils supply power to the load, and calculate a phase difference between the resonant voltage and the resonant current;

The second phase comparison unit is configured to compare phase differences of the wireless charging receiving coils, and control the wireless charging receiving coil with the smallest phase difference to supply power to the load.
A wireless charging device according to claim 8 or 9, wherein

The deviation between the second preset spacing and the fourth spacing of the wireless charging receiving coil is less than a third deviation threshold; wherein the fourth spacing is a spacing of the wireless charging transmitting coils corresponding to the wireless charging receiving coil.
A wireless charging device according to claim 8 or 9, wherein

The deviation between the fifth pitch and the sixth pitch of the wireless charging receiving coil is less than a fourth deviation threshold;

The fifth spacing is a distance between the wireless charging receiving coil and a wireless charging transmitting coil corresponding thereto; and the sixth spacing is when the wireless charging receiving coil and the corresponding wireless charging transmitting coil are coaxially placed The best transmission distance.
The wireless charging device of claim 13 wherein:

The fourth deviation threshold is 3 cm.
An electric vehicle comprising a power battery charging interface, characterized in that the electric vehicle comprises the wireless charging device according to any one of claims 8-14;

The wireless charging device is disposed on a chassis of the electric vehicle and connected to the power battery charging interface for generating magnetic coupling resonance with a wireless charging transmitting coil disposed in a preset power supply region to a power battery of the electric vehicle Charging.
A working coil switching method of a multi-coil charging device, characterized in that the multi-coil charging device comprises the wireless charging device according to any one of claims 1 to 7, the working coil switching method comprising:

Controlling each wireless charging transmitting coil to sequentially supply power to the wireless charging receiving coil;

Detecting a resonant voltage and a resonant current when the wireless charging transmitting coils supply power to the wireless charging receiving coil, and calculating a phase difference between the resonant voltage and the resonant current;

Comparing the phase differences of the wireless charging transmitting coils, and controlling the wireless charging transmitting coils having the smallest phase difference to supply power to the wireless charging receiving coils.
A working coil switching method of a multi-coil charging device, characterized in that the multi-coil charging device comprises the wireless charging device according to any one of claims 8 to 14, the working coil switching method comprising:

Controlling each wireless charging receiving coil to sequentially supply power to the load;

Detecting a resonant voltage and a resonant current when the wireless charging receiving coils supply power to the load, and calculating a phase difference between the resonant voltage and the resonant current;

The phase difference of each of the wireless charging receiving coils is compared, and the wireless charging receiving coil having the smallest phase difference is controlled to supply power to the load.
A charging station, the charging station comprising an electric vehicle charging position, characterized in that

The charging station further includes the wireless charging device according to any one of claims 1-7;

The wireless charging device is disposed at the electric vehicle charging position for generating magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery.
A smart garage including a parking space, characterized in that

The smart garage further includes the wireless charging device according to any one of claims 1-7;

The wireless charging device is disposed at the parking space for generating a magnetic coupling resonance with a wireless charging receiving coil disposed on the electric vehicle to charge the power battery.