CN106541844B - Wireless charging coil alignment method, device and system - Google Patents

Wireless charging coil alignment method, device and system Download PDF

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Publication number
CN106541844B
CN106541844B CN201610951641.4A CN201610951641A CN106541844B CN 106541844 B CN106541844 B CN 106541844B CN 201610951641 A CN201610951641 A CN 201610951641A CN 106541844 B CN106541844 B CN 106541844B
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power supply
charging
coil
supply end
end coil
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CN106541844A (en
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周诚智
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Shenzhen Woer New Energy Electric Technology Co Ltd
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Shenzhen Woer Heat Shrinkable Material Co Ltd
Changzhou Woer Heat Shrinkable Material Co Ltd
Huizhou LTK Electronic Cable Co Ltd
LTK Electric Wire Huizhou Co Ltd
Shenzhen Woer Special Cable Co Ltd
Shenzhen Woer New Energy Electric Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/35—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles
    • B60L53/38—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles specially adapted for charging by inductive energy transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a wireless charging coil alignment method, a device and a system, wherein the wireless charging coil alignment method comprises the following steps of acquiring electrical parameters related to charging of a power supply end coil and/or a vehicle end coil; adjusting the position of the coil at the power supply end in the horizontal direction according to the electrical parameters; and when the electrical parameter value reaches a preset electrical threshold value and/or the adjustment frequency reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps. According to the technical scheme, the alignment speed of the wireless charging coil is increased, and the charging efficiency is improved.

Description

Wireless charging coil alignment method, device and system
Technical Field
The invention relates to the technical field of wireless charging, in particular to a method, a device and a system for aligning a wireless charging coil.
Background
When an existing electric automobile adopting a wireless charging mode enters a wireless charging station for charging, the maximization of charging efficiency can be guaranteed only by aligning a wireless charging receiving coil at the bottom of the automobile with a wireless charging transmitting coil on the ground.
The existing alignment mode is that a driver generally controls an electric vehicle to position and align a wireless charging transmitting coil according to a positioning mark of a charging station, so that the alignment of the wireless charging transmitting coil and a wireless charging receiving coil is realized by manual control of the driver, and the alignment process is slow and low in efficiency.
Disclosure of Invention
The invention mainly aims to provide a wireless charging coil alignment method, aiming at accelerating the alignment speed of a wireless charging coil and improving the charging efficiency.
In order to achieve the above object, the present invention provides a wireless charging coil alignment method, which comprises the following steps:
acquiring electrical parameters related to charging of a power supply end coil and/or a vehicle end coil;
adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameters;
and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment frequency reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps.
Preferably, the step of "acquiring the electrical parameter related to the charging of the power supply end coil and/or the vehicle end coil" includes:
sampling charging current and charging voltage of a vehicle-mounted battery;
and calculating the charging efficiency or the coupling coefficient of the wireless charging coil.
Preferably, the step of "adjusting the position of the power supply end coil in the horizontal direction according to the preset unit stroke based on the electrical parameter" specifically includes:
substituting the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field;
calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
obtaining the charging efficiency or the coupling coefficient again, and substituting the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field;
and calculating to obtain the displacement of the power supply end coil, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
Preferably, the step of "acquiring the electrical parameter related to the charging of the power supply end coil and/or the vehicle end coil" includes:
and acquiring the charging current of the coil at the power supply end.
Preferably, the step of "adjusting the position of the power supply end coil in the horizontal direction according to the preset unit stroke based on the electrical parameter" specifically includes:
substituting the charging current of the power supply end coil into a preset current field;
calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
obtaining the charging current of the power supply end coil again, substituting the charging current of the power supply end coil into a preset current field, and calculating to obtain the displacement of the power supply end coil needing to move;
and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
Preferably, the step of "acquiring the electrical parameter related to the charging of the power supply end coil and/or the vehicle end coil" includes:
sampling the charging current and the charging voltage of the vehicle-mounted battery, and calculating the charging efficiency or the coupling coefficient of the wireless charging coil; and acquiring the charging current of the coil at the power supply end.
Preferably, the step of "adjusting the position of the power supply end coil in the horizontal direction according to the preset unit stroke based on the electrical parameter" specifically includes:
at least any two of the charging efficiency, the coupling coefficient and the charging current are respectively substituted into a corresponding preset efficiency field, a coupling coefficient field or a current field;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
at least any two of the charging efficiency and the coupling coefficient charging current are obtained again and substituted into a corresponding preset efficiency field, a coupling coefficient field or a current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
The invention provides a wireless charging primary side device which comprises a power supply end coil, a power supply management module, a first driving device and a second driving device, wherein the power supply end coil is connected with the power supply management module; wherein the content of the first and second substances,
the power supply management module acquires electrical parameters related to charging of a power supply end coil, and respectively controls the first driving device and the second driving device to adjust the position of the power supply end coil in the horizontal direction according to the electrical parameters;
and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment frequency reaches a preset maximum value, if so, stopping driving the first driving device and the second driving device, and if not, continuously adjusting the position of the coil in the horizontal direction by the first driving device and the second driving device.
Preferably, the power supply management module obtains a charging current of the power supply end coil.
Preferably, the power supply management module substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction by a plurality of preset unit strokes;
the power supply management module acquires the charging efficiency or the coupling coefficient again, and substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; and calculating to obtain the displacement of the coil to be moved, and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
Preferably, the vehicle management module acquires the charging current and the charging voltage of the vehicle-mounted battery, and calculates the charging efficiency or the coupling coefficient of the wireless charging coil; and acquiring the charging current of the coil at the power supply end.
Preferably, the power supply management module substitutes at least any two of the charging efficiency, the coupling coefficient and the charging current into a corresponding preset efficiency field, a coupling coefficient field or a current field respectively;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
The invention also provides a wireless charging system, which comprises a power supply end coil, a power supply management module, a vehicle end coil, a vehicle management module, a first driving device and a second driving device; wherein the content of the first and second substances,
the vehicle management module is used for acquiring electrical parameters related to charging of the vehicle end coil and wirelessly transmitting the related electrical parameters to the power supply management module;
the power supply management module respectively controls the first driving device and the second driving device to adjust the position of a power supply end coil in the horizontal direction according to the electrical parameters; and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment frequency reaches a preset maximum value, if so, stopping driving the first driving device and the second driving device, and if not, continuously adjusting the position of the coil in the horizontal direction by the first driving device and the second driving device.
Preferably, the vehicle management module acquires a charging current and a charging voltage of the vehicle-mounted battery and calculates a charging efficiency or a coupling coefficient of the wireless charging coil.
Preferably, the power supply management module substitutes the charging current of the power supply end coil into a preset current field; calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires the charging current of the power supply end coil again, substitutes the charging current of the power supply end coil into a preset current field at the moment, and calculates to obtain the displacement of the power supply end coil needing to move; and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
Preferably, the vehicle management module acquires the charging current and the charging voltage of the vehicle-mounted battery, and calculates the charging efficiency or the coupling coefficient of the wireless charging coil; and acquiring the charging current of the coil at the power supply end.
Preferably, the power supply management module substitutes at least any two of the charging efficiency, the coupling coefficient and the charging current into a corresponding preset efficiency field, a coupling coefficient field or a current field respectively;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
According to the technical scheme, the electric parameters related to charging of the power supply end coil and/or the vehicle end coil are obtained, the position of the power supply end coil in the horizontal direction is adjusted according to the electric parameters, and when the set adjustment times or the set electric threshold is reached, namely the power supply end coil and the vehicle end coil are aligned to reach the set optimal charging state, the alignment process is finished. In the alignment process of the power supply end coil and the vehicle end coil, the electric vehicle only needs to be driven into the designated charging position, and then manual intervention is not needed, so that automatic alignment is completely realized, and the alignment speed and accuracy of the coil are obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of a wireless charging coil alignment method of the present invention;
FIG. 2 is a further flowchart of the first embodiment of step S100 in FIG. 1;
FIG. 3 is a further flowchart of the first embodiment of step S200 in FIG. 1;
FIG. 4 is a flowchart illustrating a first embodiment of a wireless charging coil alignment method according to the present invention;
FIG. 5 is a further flowchart of the second embodiment of step S200 in FIG. 1;
FIG. 6 is a flowchart illustrating a second embodiment of a wireless charging coil alignment method according to the present invention;
FIG. 7 is a further flowchart of the third embodiment of step S200 in FIG. 1
Fig. 8 is a functional block diagram of a wireless charging primary side device of the present invention;
FIG. 9 is a functional block diagram of a wireless charging system according to the present invention;
fig. 10 is an equivalent schematic diagram of a charging circuit of the wireless charging system of fig. 9;
FIG. 11 is a diagram illustrating the coordinates of the center of the coil at the power supply end in the horizontal position and the corresponding charge coupling coefficient;
fig. 12 is a schematic diagram of the coordinates of the center of the coil at the power supply end in the horizontal position and the corresponding charging efficiency.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
10 Power supply end power supply conversion module 40 Charging terminal coil
20 Power supply end coil 50 Charging terminal power supply conversion module
30 Power supply management module 60 Vehicle management module
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a wireless charging coil alignment method. The wireless charging coil alignment method is applied to an automobile wireless charging system, and refer to fig. 9. The system comprises a power supply end coil 20, a vehicle end coil 40, a power supply management module 30, a vehicle management module 60 and a driving device for driving the power supply end coil 20 and the vehicle end coil 40 to move, wherein in the embodiment, the driving device is implemented by adopting a motor. Wherein, wireless communication is adopted between the power supply management module 30 and the vehicle management module 60. The power supply management module 30 is used for acquiring electrical parameters of the power supply end coil 20, such as current, voltage, and the like, and the vehicle management module 60 is used for acquiring charging current and voltage of the vehicle-mounted battery. The power supply management module 30 and the vehicle management module 60 together control charging of the wireless charging system.
Referring to fig. 1, in an embodiment of the present invention, the wireless charging coil alignment method includes the steps of:
and S100, acquiring electrical parameters related to charging of the power supply end coil 20 and/or the vehicle end coil 40. The electrical parameters may be electrical parameters such as current, charging efficiency, coupling coefficient, etc.
And S200, adjusting the position of the power supply end coil 20 in the horizontal direction according to the electrical parameters. It should be noted that the charging efficiency of the wireless charging coil or the coupling coefficient of the power supply end coil 20 and the vehicle end coil 40 is inversely related to the center distance of the power supply end coil 20 and the vehicle end coil 40 on the premise that the height difference between the power supply end coil 20 and the vehicle end coil 40 is not changed. Therefore, in the actual charging process, the position of the power supply end coil 20 needs to be adjusted so that the center distance between the two coils is within the set range.
S300, judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the cycle number reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps.
Referring to fig. 11 and 12, the correspondence data between the current value, the charging efficiency, or the coupling coefficient and the horizontal position of the power supply end coil 20 in the set range is obtained from the experimental data in advance. These data are stored in the power supply management module 30, and in the alignment process of the wireless charging coil, the direction and distance of the power supply end coil 20, which need to be adjusted, can be known according to the data, and an ideal charging efficiency value can be obtained through correction for many times. The left side of fig. 11 and 12 is the coordinate of the horizontal position xy, and the right side of fig. 11 and 12 corresponds to the coupling coefficient and the charging efficiency, respectively. As can be seen from the figure, the lighter position of the left position coordinate corresponds to the lighter coupling coefficient value and the lighter charging efficiency value of the right position coordinate. Therefore, the technical scheme of the invention is to enable the central position of the coil at the power supply end to be infinitely close to the zero coordinates in fig. 11 and 12, so that the charging state is optimal.
According to the technical scheme, the electric parameters related to charging of the power supply end coil 20 and/or the vehicle end coil 40 are obtained, the position of the power supply end coil 20 in the horizontal direction is adjusted according to the electric parameters, and when the set adjustment times or the set electric threshold is reached, namely the power supply end coil 20 and the vehicle end coil 40 are aligned to reach the set optimal charging state, the alignment process is ended. In the alignment process of the power supply end coil 20 and the vehicle end coil 40, only the electric vehicle is required to drive into a specified charging position, and then manual intervention is not required, so that automatic alignment is completely realized, and the alignment speed and accuracy of the coils are obviously improved.
Referring to fig. 2, in the first embodiment, the step of "acquiring the electrical parameter related to the charging of the power supply end coil 20 and/or the vehicle end coil 40" includes:
s110a, sampling the charging current and the charging voltage of the vehicle-mounted battery;
and S120a, calculating the charging efficiency or the coupling coefficient of the wireless charging coil.
The current and voltage of the power supply end coil 20 are known, and the charging efficiency or the coupling coefficient of the wireless charging coil can be calculated according to the sampled charging current and charging voltage of the vehicle-mounted battery.
Specifically, referring to fig. 3, the step of "adjusting the position of the power supply end coil 20 in the horizontal direction according to the preset unit stroke based on the electrical parameter" specifically includes:
s210a, substituting the charging efficiency or the coupling coefficient into a preset efficiency field or coupling coefficient field;
s220a, calculating to obtain the displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a first direction for a plurality of preset unit strokes; the unit stroke is the minimum unit distance that the power supply terminal coil 20 can move.
S230a, acquiring the charging efficiency or the coupling coefficient again, and substituting the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field;
and S240a, calculating the displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction. In this embodiment, the first direction and the second direction are the x-axis direction and the y-axis direction of the power supply end coil on the horizontal coordinate system.
Note that the obtained charging efficiency or the obtained coupling coefficient itself is a scalar quantity, and cannot provide a direction in which the power supply end coil 20 should move. However, by substituting the obtained charging efficiency into the efficiency field and deriving the efficiency field, the direction of the power supply side coil 20 corresponding to the optimum charging efficiency value can be known. The derivation process is to change the position of the power supply coil 20 and obtain the charging efficiency value. The same is true for the technical principle of controlling the movement of the power supply side coil 20 by the coupling coefficient. The derivation formula of the charging efficiency can be expressed as:
Figure BDA0001141604990000081
where e denotes the charging efficiency, and x and y denote the positions of the power supply terminal coil 20 in the first direction and the second direction.
The derived direction is the direction in which the power supply side coil 20 is to be moved. The movement of each motor may be simple, just a forward or backward movement, or a more advanced movement of a preset distance. By a given distance (this distance is relevant)
Figure BDA0001141604990000093
Equation (a) of
Figure BDA0001141604990000094
Larger means farther from the center, and thus specifiedThe greater the distance can be), the derivation process takes place again and a correction is made to the direction of movement. This process is cycled through until the absolute value of the derivative is reached (
Figure BDA0001141604990000095
) If the number of the cycles is small or reaches a preset number, the alignment process is judged to be finished.
Referring to fig. 4, the technical solution will now be further explained with reference to specific embodiments:
s10a, starting normal charging or charging with small current for special alignment process;
s20a, the vehicle management module 60 feeds back the battery charging voltage and the charging current to the power supply end;
s30a, the power supply management module 30 calculates and records the charging efficiency e or the coupling coefficient k;
s40a, the power supply management module 30 controls the power supply end coil 20 to move a distance, such as 5 mm, along the x-axis direction;
s50a, the vehicle management module 60 feeds back the battery charging voltage and the charging current to the power supply end;
s60a, calculating and recording the charging efficiency ex or the coupling coefficient kx by the power supply management module 30;
s70a, the power supply management module 30 controls the power supply end coil 20 to move a distance, for example, 5 mm, along the y-axis direction;
s80a, the vehicle management module 60 feeds back the battery charging voltage and the charging current to the power supply end;
s90a, the power supply management module 30 calculates and records the charging efficiency ey or the coupling coefficient ky;
s100a, judging whether the cycle number reaches a set maximum value or the charging efficiency reaches a set value or the coupling coefficient value reaches a set value, if so, ending; if not, the process loops through steps S2-S9.
In the second embodiment, the difference between the present embodiment and the first embodiment is that the present embodiment only needs to obtain the current of the power supply end coil 20, and the control process is simpler.
According to the existing theory, the charging circuit module of the charging system can be usedThe model is simplified to the circuit diagram shown in fig. 10. The degree of tightness M of coupling between the power supply end coil 20 and the vehicle end coil 40 can be expressed as
Figure BDA0001141604990000091
Wherein L1 and L2 are self-inductance coefficients of the power supply side coil 20 and the charging side coil, respectively, and k is a coupling coefficient.
Power supply terminal coil 20 current iSAnd vehicle end coil 40 current iLThe expression can be expressed as
Figure BDA0001141604990000092
Wherein VLIs the battery voltage, VSIs a voltage of the power supply and is,
it can thus be seen that when the battery charge attribute V is presentLAnd ILWhen the value of M is constant, the larger the value of M, the smaller the current flowing through the power supply side coil 20. The charging efficiency (and the coupling coefficient) is inversely related to the center distance of the coil on the premise that the distance (namely, the height difference) between the coil and the coil axis of the vehicle is not changed. Therefore, it is only necessary to obtain the current of the power supply end coil 20.
Specifically, the step of "acquiring the electrical parameter related to the charging of the power supply end coil 20 and/or the vehicle end coil 40" includes:
the charging current of the power supply terminal coil 20 is acquired.
Referring to fig. 5, specifically, the step of "adjusting the position of the power supply end coil 20 in the horizontal direction according to the preset unit stroke based on the electrical parameter" includes:
s210b, substituting the charging current of the power supply end coil 20 into a preset current field;
s220b, calculating to obtain the displacement of the power supply end coil 20 required to move, and controlling the power supply end coil 20 to move along a first direction for a plurality of preset unit strokes;
s230b, obtaining the charging current of the power supply end coil 20 again, substituting the charging current of the power supply end coil 20 into a preset current field, and calculating to obtain the displacement of the power supply end coil 20 needing to move;
and S240b, controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction.
It should be noted that the alignment process of the power supply end coil 20 in the horizontal plane (i.e., the orthogonal plane) is a process of finding the position where the current of the power supply end coil 20 is the minimum without changing the battery state. Since the time required for the alignment process is short, it can be assumed that the battery state does not change during the alignment process.
Although the current itself is only a scalar and does not provide the direction in which the supply end coil 20 should move, by derivation of the current field, the orientation of the maximum can be known. The derivation is performed by changing the position of the coil and recording the amount of change in the current of the power supply coil 20. The derivation formula for the current of the power supply end coil 20 is:
Figure BDA0001141604990000101
where x and y are the positions of the supply end coil 20 in the first and second directions, respectively.
The derived direction is the direction in which the power supply end coil 20 moves. The movement of the power supply terminal coil 20 may be simple, only a forward or backward movement, or may be a more advanced movement of a preset distance. By a specified distance (this distance may be relevant)
Figure BDA0001141604990000102
Equation (a) of
Figure BDA0001141604990000103
Larger means farther from the center, and thus the designated distance may be larger), the derivation process occurs again and a correction is made to the direction of movement of the power supply side coil 20. This process is cycled through until the absolute value of the derivative (i.e., the absolute value of the derivative is found
Figure BDA0001141604990000111
) And if the number of the alignment process is small or reaches a preset cycle number, the alignment process is judged to be finished.
Referring to fig. 6, the technical solution will now be further explained with reference to specific embodiments:
s10b, starting normal charging or charging with small current for special alignment process;
s20b, the vehicle management module 60 acquires the current of the power supply end coil 20;
s30b, the power supply management module 30 controls the power supply end coil 20 to move a certain distance, for example, 5 mm, along the x-axis direction;
s40b, the power supply management module 30 records the current ix of the power supply end coil 20,
s50b, the power supply management module 30 controls the power supply end coil 20 to move a distance, for example, 5 mm, along the y-axis direction;
s60b, the power supply management module 30 records the current iy of the power supply end coil 20;
s70b, the power supply management module 30 calculates the current variation of the power supply end coil 20;
s80b, judging whether the cycle number reaches a set maximum value or the charging current reaches a set value, if so, ending; if not, the process loops through steps S2-S7.
In a third embodiment, referring to fig. 7, specifically, the step of "acquiring an electrical parameter electrically related to the power supply end coil 20 and/or the vehicle end coil 40" includes:
sampling the charging current and the charging voltage of the vehicle-mounted battery, and calculating the charging efficiency or the coupling coefficient of the wireless charging coil; and obtains the charging current of the power supply terminal coil 20.
Specifically, the step of "adjusting the position of the power supply end coil 20 in the horizontal direction according to the preset unit stroke based on the electrical parameter" specifically includes:
s210c, substituting at least any two of the charging efficiency, the coupling coefficient and the charging current into a corresponding preset efficiency field, a coupling coefficient field or a current field respectively;
s2210c, calculating to obtain the average displacement of the power supply end coil 20 which needs to move, and controlling the power supply end coil 20 to move along a first direction for a plurality of preset unit strokes;
s230c, at least any two of the charging efficiency and the coupling coefficient charging current are obtained again and substituted into the corresponding preset efficiency field, coupling coefficient field or current field respectively;
and S240c, calculating to obtain the average displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction.
In the third embodiment, a plurality of electrical parameters are acquired and substituted into corresponding fields, and the obtained displacements are averaged, and the position of the power supply end coil 20 is adjusted based on the average value. Compared with the first embodiment and the second embodiment, the embodiment has the advantage of high adjustment accuracy.
Referring to fig. 8, the present invention provides a wireless charging primary side device, including a power supply end coil 20, a power supply management module 30, a first driving device (not shown), and a second driving device (not shown); in this embodiment, the first driving device and the second driving device are both implemented by using motors. The two motors drive the power supply end coil 20 to move along the x-axis direction or the y-axis direction respectively. In addition, the wireless charging primary side device further comprises a power supply end power conversion module 10, wherein the power supply end power conversion module 10 is used for converting alternating current output by a power supply into rectification, filtering, voltage regulation, inversion and the like and then outputting the alternating current to a vehicle end coil, and the alternating current is rectified, filtered, voltage regulation and the like by a vehicle end power conversion module 50 and then is used for charging a vehicle-mounted battery.
The power supply management module 30 obtains electrical parameters related to charging of the power supply end coil 20, and respectively controls the first driving device and the second driving device to adjust the position of the power supply end coil 20 in the horizontal direction according to the electrical parameters; and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the cycle number reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps.
Further, the power supply management module 30 obtains the charging current of the power supply end coil 20.
Further, the power supply management module 30 substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; calculating to obtain the displacement of the coil to be moved, and controlling the power supply end coil 20 to move along a first direction by a plurality of preset unit strokes;
the power supply management module 30 acquires the charging efficiency or the coupling coefficient again, and substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; and calculating the displacement of the coil to be moved, and controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
Further, the vehicle management module 60 obtains the charging current and the charging voltage of the vehicle-mounted battery, and calculates the charging efficiency or the coupling coefficient of the wireless charging coil; and obtains the charging current of the power supply terminal coil 20.
Specifically, the power supply management module 30 substitutes at least any two of the charging efficiency, the coupling coefficient, and the charging current into a corresponding preset efficiency field, a coupling coefficient field, or a current field, respectively;
calculating to obtain the average displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a first direction for a plurality of preset unit strokes;
the power supply management module 30 acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again, and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction.
Referring to fig. 9, the present invention further provides a wireless charging system, which includes a power supply end coil 20, a power supply management module 30, a vehicle end coil 40, a vehicle management module 60, a first driving device and a second driving device; the wireless charging primary side device further comprises a power supply end power conversion module 10 and a vehicle end power conversion module 50, wherein the power supply end power conversion module 10 is used for converting alternating current output by a power supply into a current after rectification, filtering, voltage regulation, inversion and the like and then outputting the current to a vehicle end coil, and the current is rectified, filtered, voltage regulation and the like through the vehicle end power conversion module 50 and then is used for charging a vehicle-mounted battery.
The vehicle management module 60 is used for acquiring electrical parameters related to charging of the vehicle end coil 40 and wirelessly transmitting the related electrical parameters to the power supply management module 30;
the power supply management module 30 controls the first driving device and the second driving device to adjust the position of the power supply end coil 20 in the horizontal direction according to the electrical parameters; and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the cycle number reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps.
Further, the vehicle management module 60 obtains the charging current and the charging voltage of the vehicle-mounted battery, and calculates the charging efficiency or the coupling coefficient of the wireless charging coil.
Further, the power supply management module 30 substitutes the charging current of the power supply end coil 20 into a preset current field; calculating to obtain the displacement of the power supply end coil 20 required to move, and controlling the power supply end coil 20 to move along a first direction by a plurality of preset unit strokes;
the power supply management module 30 obtains the charging current of the power supply end coil 20 again, substitutes the charging current of the power supply end coil 20 into a preset current field at the moment, and calculates to obtain the displacement of the power supply end coil 20 required to move; the power supply end coil 20 is controlled to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction.
Specifically, the vehicle management module 60 obtains the charging current and the charging voltage of the vehicle-mounted battery, and calculates the charging efficiency or the coupling coefficient of the wireless charging coil; and obtains the charging current of the power supply terminal coil 20.
Specifically, the power supply management module 30 substitutes at least any two of the charging efficiency, the coupling coefficient, and the charging current into a corresponding preset efficiency field, a coupling coefficient field, or a current field, respectively;
calculating to obtain the average displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a first direction for a plurality of preset unit strokes;
the power supply management module 30 acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again, and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil 20 to be moved, and controlling the power supply end coil 20 to move along a second direction by a plurality of preset unit strokes, wherein the second direction is perpendicular to the first direction.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (17)

1. A wireless charging coil alignment method, comprising:
acquiring electrical parameters related to charging of a power supply end coil and/or a vehicle end coil;
adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameters and the preset unit stroke;
substituting the charging efficiency into an efficiency field, carrying out derivation on the efficiency field through an efficiency field derivation formula, and adjusting the position of a power supply end coil in the horizontal direction according to a derivation result;
the efficiency field derivation formula is:
Figure 94462DEST_PATH_IMAGE001
wherein e is charging efficiency, and x and y represent the positions of the power supply terminal coil in the first direction and the second direction;
or substituting the charging current into a current field, carrying out derivation on the current field through a current field derivation formula, and adjusting the position of the power supply end coil in the horizontal direction according to a derivation result;
the current field derivation formula is:
Figure 27783DEST_PATH_IMAGE002
wherein isFor charging efficiency, x and y represent the positions of the power supply terminal coil in the first direction and the second direction;
and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment times reaches a preset maximum value, if so, finishing the alignment of the charging coil, and if not, circulating the steps.
2. The wireless charging coil alignment method of claim 1, wherein the step of "obtaining power end coil and/or vehicle end coil charging related electrical parameters" comprises:
sampling charging current and charging voltage of a vehicle-mounted battery;
and calculating the charging efficiency or the coupling coefficient of the wireless charging coil.
3. The method for aligning a wireless charging coil according to claim 2, wherein the step of adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameter by a preset unit stroke specifically comprises:
substituting the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field;
calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
obtaining the charging efficiency or the coupling coefficient again, and substituting the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field;
and calculating to obtain the displacement of the power supply end coil, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
4. The wireless charging coil alignment method of claim 1, wherein the step of "obtaining power end coil and/or vehicle end coil charging related electrical parameters" comprises:
and acquiring the charging current of the coil at the power supply end.
5. The method for aligning a wireless charging coil according to claim 4, wherein the step of adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameter by a preset unit stroke specifically comprises:
substituting the charging current of the power supply end coil into a preset current field;
calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
obtaining the charging current of the power supply end coil again, substituting the charging current of the power supply end coil into a preset current field, and calculating to obtain the displacement of the power supply end coil needing to move;
and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
6. The wireless charging coil alignment method of claim 1, wherein the step of "obtaining power end coil and/or vehicle end coil charging related electrical parameters" comprises:
sampling the charging current and the charging voltage of the vehicle-mounted battery, and calculating the charging efficiency or the coupling coefficient of the wireless charging coil; and acquiring the charging current of the coil at the power supply end.
7. The method for aligning a wireless charging coil according to claim 6, wherein the step of adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameter by a preset unit stroke specifically comprises:
at least any two of the charging efficiency, the coupling coefficient and the charging current are respectively substituted into a corresponding preset efficiency field, a coupling coefficient field or a current field;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
at least any two of the charging efficiency, the coupling coefficient and the charging current are obtained again and substituted into a corresponding preset efficiency field, a coupling coefficient field or a current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
8. A wireless charging primary side device is characterized by comprising a power supply end coil, a power supply management module, a first driving device and a second driving device; wherein the content of the first and second substances,
the power supply management module acquires electrical parameters related to charging of a coil at a power supply end; adjusting the position of the power supply end coil in the horizontal direction according to the electrical parameters and the preset unit stroke;
substituting the charging efficiency into an efficiency field, carrying out derivation on the efficiency field through an efficiency field derivation formula, and respectively controlling the first driving device and the second driving device to adjust the position of a power supply end coil in the horizontal direction according to a derivation result;
the efficiency field derivation formula is:
Figure 227820DEST_PATH_IMAGE003
wherein e is charging efficiency, and x and y represent the positions of the power supply terminal coil in the first direction and the second direction; or substituting the charging current into a current field, performing derivation on the current field through a current field derivation formula, and respectively controlling the first driving device and the second driving device to adjust the position of the power supply end coil in the horizontal direction according to the derivation result;
the current field derivation formula is:
Figure 768654DEST_PATH_IMAGE004
wherein isFor charging efficiency, x and y represent the positions of the power supply terminal coil in the first direction and the second direction;
and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment frequency reaches a preset maximum value, if so, stopping driving the first driving device and the second driving device, and if not, continuously adjusting the position of the coil in the horizontal direction by the first driving device and the second driving device.
9. The wireless charging primary side device according to claim 8, wherein the power management module obtains a charging current of the power supply side coil.
10. The wireless charging primary side unit of claim 9,
the power supply management module substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction by a plurality of preset unit strokes;
the power supply management module acquires the charging efficiency or the coupling coefficient again, and substitutes the charging efficiency or the coupling coefficient into a preset efficiency field or a preset coupling coefficient field; and calculating to obtain the displacement of the coil to be moved, and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
11. The wireless charging primary side device according to claim 8, wherein the power supply management module receives the charging current and the charging voltage of the vehicle-mounted battery acquired by the vehicle management module, and the charging efficiency or the coupling coefficient of the wireless charging coil calculated by the vehicle management module; and acquiring the charging current of the coil at the power supply end.
12. The wireless charging primary side device according to claim 11, wherein the power supply management module substitutes at least any two of the charging efficiency, the coupling coefficient, and the charging current into a corresponding preset efficiency field, coupling coefficient field, or current field, respectively;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
13. A wireless charging system is characterized by comprising a power supply end coil, a power supply management module, a vehicle end coil, a vehicle management module, a first driving device and a second driving device; wherein the content of the first and second substances,
the vehicle management module acquires electrical parameters related to charging of the power supply end coil and/or the vehicle end coil and wirelessly transmits the related electrical parameters to the power supply management module;
the power supply management module generates position adjustment parameters according to the electrical parameters and a preset field, and respectively controls the first driving device and the second driving device to adjust the position of the power supply end coil in the horizontal direction according to the position adjustment parameters;
the power supply management module substitutes the charging efficiency into an efficiency field, conducts derivation on the efficiency field through an efficiency field derivation formula, and respectively controls the first driving device and the second driving device to adjust the position of a power supply end coil in the horizontal direction according to the derivation result;
the efficiency field derivation formula is:
Figure 257404DEST_PATH_IMAGE001
wherein e is charging efficiency, and x and y represent the positions of the power supply terminal coil in the first direction and the second direction;
or the power supply management module substitutes the charging current into a current field, conducts derivation on the current field through a current field derivation formula, and respectively controls the first driving device and the second driving device to adjust the position of the power supply end coil in the horizontal direction according to the derivation result;
the current field derivation formula is:
Figure 791154DEST_PATH_IMAGE002
wherein isFor charging efficiency, x and y represent the positions of the power supply terminal coil in the first direction and the second direction;
and judging whether the electrical parameter value reaches a preset electrical threshold value and/or whether the adjustment frequency reaches a preset maximum value, if so, stopping driving the first driving device and the second driving device, and if not, continuously adjusting the position of the coil in the horizontal direction by the first driving device and the second driving device.
14. The wireless charging system of claim 13, wherein the vehicle management module obtains a charging current and a charging voltage of the vehicle-mounted battery and calculates a charging efficiency or a coupling coefficient of the wireless charging coil.
15. The wireless charging system of claim 14, wherein the power management module substitutes a charging current of the power supply end coil into a preset current field; calculating to obtain the displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires the charging current of the power supply end coil again, substitutes the charging current of the power supply end coil into a preset current field at the moment, and calculates to obtain the displacement of the power supply end coil needing to move; and controlling the power supply end coil to move a plurality of preset unit strokes along a second direction, wherein the second direction is vertical to the first direction.
16. The wireless charging system of claim 13, wherein the vehicle management module obtains a charging current and a charging voltage of the vehicle-mounted battery, calculates a charging efficiency or a coupling coefficient of the wireless charging coil; and acquiring the charging current of the coil at the power supply end.
17. The wireless charging system of claim 16, wherein the power management module substitutes at least any two of the charging efficiency, the coupling coefficient, and the charging current into a corresponding preset efficiency field, coupling coefficient field, or current field, respectively;
calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a first direction for a plurality of preset unit strokes;
the power supply management module acquires at least any two of the charging efficiency, the coupling coefficient or the charging current again and substitutes the charging efficiency, the coupling coefficient or the charging current into a corresponding preset efficiency field, coupling coefficient field or current field respectively;
and calculating to obtain the average displacement of the power supply end coil needing to move, and controlling the power supply end coil to move along a second direction by a plurality of preset unit strokes, wherein the second direction is vertical to the first direction.
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