CN111509820B - Wireless charging control method and device - Google Patents

Wireless charging control method and device Download PDF

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Publication number
CN111509820B
CN111509820B CN202010532166.3A CN202010532166A CN111509820B CN 111509820 B CN111509820 B CN 111509820B CN 202010532166 A CN202010532166 A CN 202010532166A CN 111509820 B CN111509820 B CN 111509820B
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charging
transmitting
transmitting coil
coil
wireless charging
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CN111509820A (en
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胡锦敏
侯延进
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Shenzhen Hertz Innovation Technology Co ltd
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Shenzhen Hertz Innovation 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
    • 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
    • B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • 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
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention provides a wireless charging control method and a wireless charging control device, which belong to the technical field of wireless power transmission, and the control method comprises the following steps: when the power-on device is started, the double-pole double-throw switch is controlled to be pulled to one switching contact, and the transmitting terminal starts to charge the no-load receiving terminal; detecting the charging voltage of a receiving end and judging whether the charging voltage reaches a charging threshold value; if yes, controlling the transmitting terminal to continue charging the receiving terminal so that the receiving terminal charges the battery; if not, the transmitting end is stopped charging the receiving end, the double-pole double-throw switch is controlled to be switched to the other switching contact, and then the transmitting end is controlled to charge the receiving end, so that the receiving end charges the battery. The direction of the magnetic force line is adaptively changed according to the transverse offset of the receiving coil, so that the wireless charging device has stronger offset resistance, adaptability and practicability, and has the advantages of high control reliability and high sensitivity.

Description

Wireless charging control method and device
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a wireless charging control method and device.
Background
An Automated Guided Vehicle (AGV) is a Vehicle equipped with an electromagnetic or optical automatic guide device, which can travel along a predetermined guide path, and has safety protection and various transfer functions, and is widely used in places such as a logistics sorting station. Rechargeable batteries are currently the only power source for AGVs. At present, most of the storage batteries of the AGVs use charging modes such as manual charging, battery replacement charging, automatic charging and the like. Wherein manual charging and trade this two kinds of modes of battery charging all need the full-time personnel to carry out the line connection operation or manual change group battery, and need the special messenger to watch relevant equipment, lead to degree of automation to reduce, and extravagant manpower, in case leak and fill, will cause the unable normal work of AGV. The automatic charging mode is that a ground control center commands an AGV needing to supplement power to drive to a designated charging area or a platform, a vehicle-mounted charging connector is automatically connected with a ground charging system and performs charging, the AGV automatically breaks away from the charging system after the charging is finished, and the AGV drives to a working area or a standby area to be put into normal operation. Compared with manual charging and battery replacement charging, the automatic charging mode has higher automation degree, improves the working cycle of the AGV and saves more manpower.
However, the requirement of an automatic charging system is strict, the requirement on the control accuracy of the AGV during charging is high, and a vehicle-mounted charging connector jack needs to be accurately inserted into a charging pile, so that a lot of steps and procedures are needed to adjust the direction and the direction of the AGV, and the charging steps are complex.
Disclosure of Invention
The invention provides a wireless charging device, and aims to solve the technical problems that in the prior art, charging control steps are complicated, potential safety hazards exist, a charging contact is easy to wear, and the charging device cannot normally work in a severe environment when an AGV automatically charges.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
a wireless charging control method is suitable for a wireless charging device, the wireless charging device comprises a transmitting end and a receiving end, the transmitting end comprises a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are partially overlapped to realize that mutual inductance after the first transmitting coil and the second transmitting coil are electrified is zero, and the wireless charging control method comprises the following steps:
when the power-on device is started, the double-pole double-throw switch is controlled to be switched to one switching contact, so that the directions of currents flowing through the first transmitting coil and the second transmitting coil are the same or opposite, and the transmitting end starts to charge the unloaded receiving end;
detecting the charging voltage of the receiving end and judging whether the charging voltage reaches a charging threshold value;
if yes, controlling the transmitting terminal to continue charging the receiving terminal so that the receiving terminal charges a battery;
if not, stopping charging the receiving end from the transmitting end, controlling the double-pole double-throw switch to be switched to another switching contact point so as to enable the directions of currents flowing through the first transmitting coil and the second transmitting coil to be opposite or the same, and then controlling the transmitting end to charge the receiving end so as to enable the receiving end to charge the battery.
A wireless charging control device is suitable for a wireless charging device, the wireless charging device comprises a transmitting terminal and a receiving terminal, the transmitting terminal comprises a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are partially overlapped to realize that mutual inductance after the first transmitting coil and the second transmitting coil are electrified is zero, and the wireless charging control device comprises:
the starting unit is used for controlling the double-pole double-throw switch to be poked to one switching contact when starting, so that the current directions flowing through the first transmitting coil and the second transmitting coil are the same or opposite, and the transmitting end starts to charge the unloaded receiving end;
the detection and judgment unit is used for detecting the charging voltage of the receiving end and judging whether the charging voltage reaches a charging threshold value;
the first charging control unit is used for controlling the transmitting terminal to continue to charge the receiving terminal if the charging voltage is judged to reach the charging threshold value, so that the receiving terminal charges a battery;
and the second charging control unit is used for stopping the transmitting terminal from charging the receiving terminal if the charging voltage is judged not to reach the charging threshold value, controlling the double-pole double-throw switch to dial to another switching contact so as to enable the current flowing through the first transmitting coil and the second transmitting coil to be opposite or the same in direction, and then controlling the transmitting terminal to charge the receiving terminal so as to enable the receiving terminal to charge the battery.
The wireless charging control method has the advantages that the switching control of the series connection mode of the first transmitting coil and the second transmitting coil is realized based on the comparison result of the charging voltage of the receiving end and the charging threshold value and the double-pole double-throw switch, so that the direction of the magnetic force line is changed, the direction of the magnetic force line is changed in a self-adaptive mode according to the transverse offset of the receiving coil, the wireless charging device has strong offset resistance, adaptability and practicability, and the wireless charging control method has the advantages of high control reliability and high sensitivity.
Drawings
Fig. 1 is a schematic diagram of a coil structure of a transmitting terminal and a receiving terminal of a wireless charging device according to an embodiment of the invention;
fig. 2 is a main circuit structure diagram of a wireless charging device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a double-pole double-throw switch connected to one of a first transmitting coil and a second transmitting coil;
FIG. 4 is a graph of coupling coefficient as a function of percent lateral distance shift;
fig. 5 is a flowchart illustrating a wireless charging control method according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a wireless charging control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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, for the convenience of description, only some but not all of the matters related to the present invention are shown in the drawings.
In one embodiment, the present invention provides a wireless charging device comprising: the transmitting end comprises a first transmitting coil and a second transmitting coil, and the first transmitting coil and the second transmitting coil are partially overlapped to realize that the mutual inductance of the first transmitting coil and the second transmitting coil is zero after the first transmitting coil and the second transmitting coil are electrified; and the receiving end comprises a first receiving coil and a second receiving coil, and the first receiving coil and the second receiving coil are tiled and jointed.
Specifically, in the present embodiment, the wireless charging apparatus includes a transmitting end and a receiving end electromagnetically coupled to the transmitting end. Fig. 1 is a schematic diagram of a coil structure of a transmitting end and a receiving end. As shown in fig. 1, the transmitting terminal includes a first transmitting coil LP1 and a second transmitting coil LP2, the first transmitting coil LP1 and the second transmitting coil LP2 overlap each other in a lap winding manner, the area of the overlapping portion is denoted as Sc, and since the magnetic induction directions of the first transmitting coil LP1 and the second transmitting coil LP2 are opposite, the magnetic fluxes of the first transmitting coil LP1 and the second transmitting coil LP2 can be exactly cancelled by adjusting the size of the overlapping area Sc of the two, so that the mutual inductance between the first transmitting coil LP1 and the second transmitting coil LP2 can be exactly cancelled outMThe zero point is zero, so that the two coils can not influence each other when working respectively, and can be used as independent coils for analysis and control.
In the embodiment, the first transmitting coil LP1 and the second transmitting coil LP2 are connected in series, and the series connection (forward series connection and reverse series connection) of the first transmitting coil LP1 and the second transmitting coil LP2 can be switched, and when the first transmitting coil LP1 and the second transmitting coil LP2 are connected in series, the equivalent inductance is
Figure 635723DEST_PATH_IMAGE001
，
When the first transmitting coil LP1 and the second transmitting coil LP2 are connected in series in opposite directions, the equivalent inductance is
Figure 615181DEST_PATH_IMAGE002
，
According to the equivalent inductance calculation formula, since the mutual inductance between the first transmitting coil LP1 and the second transmitting coil LP2 is zero, the equivalent inductance of the first transmitting coil LP1 and the second transmitting coil LP2 remains unchanged regardless of whether the first transmitting coil LP1 and the second transmitting coil LP2 are connected in series in a forward direction or in an inverse direction. Under the condition that the equivalent inductance of the first transmitting coil LP1 and the equivalent inductance of the second transmitting coil LP2 are not changed, parameters of other elements in a main loop of the wireless charging device are not changed, and the direction of a magnetic line (magnetic field) of a transmitting end can be switched between the vertical direction and the horizontal direction by using only one set of inverter circuit, so that the excitation efficiency of a receiving end is improved.
Referring to fig. 1, the receiving end includes a first receiving coil LS1 and a second receiving coil LS2, the first receiving coil LS1 and the second receiving coil LS2 are laid flat in a planar winding manner, and the first receiving coil LS1 and the second receiving coil LS2 are disposed to be joined. The transmitting coil adopts lap winding, and when the offset occurs, the overlapping part of the first transmitting coil LP1 and the second transmitting coil LP2 is equivalent to a single coil and is separately coupled with the first receiving coil LS1 and the second receiving coil LS 2. The first receiving coil LS1 and the second receiving coil LS2 can meet the requirement by adopting a double-coil flat winding mode, and the processing difficulty is facilitated to be simplified.
The working process of the wireless charging device is as follows: first, the first transmitting coil LP1 and the second transmitting coil LP2 are powered on, the first transmitting coil LP1 and the second transmitting coil LP2 are powered on to generate a magnetic field, the first receiving coil LS1 and the second receiving coil LS2 induce the magnetic field generated when the first transmitting coil LP1 and the second transmitting coil LP2 are powered on to generate induced electromotive force, and induced currents are generated in the first receiving coil LS1 and the second receiving coil LS2, so that the load battery is charged.
The wireless charging device of the embodiment can be implemented by adopting a topological structure in the prior art, for example, an LCC-S structure and the like can be adopted, because the equivalent resistance of the battery charging is generally very small and is within 5 ohms, and the charging voltage is generally between 24V and 60V, the LCC-S structure is selected by the topological structure, and the LCC-S structure has good anti-offset capability in the charging process, has the constant-voltage source output characteristic, and is very suitable for charging the battery.
As a specific embodiment of the wireless charging device, the wireless charging device of the present invention will be described in detail below by taking an example in which the topology employs an LCC-S structure. Fig. 2 is a schematic diagram of a main circuit structure of a wireless charging device according to an embodiment of the present invention. As shown in fig. 2, the wireless charging device includes a transmitting terminal and a receiving terminal, the transmitting terminal includes an input voltageU in Primary side compensation inductorL rCompensating primary side compensating inductorL rResistance ofR LrA first capacitorC PInternal resistance of transmitting terminalR PCompensating capacitorC rAnd a transmitting coilL PTransmitting coilL PComprising a first transmitting coil LP1 and a second transmitting coil LP2, input with a voltageU in Is connected to a resistorR LrAnd a primary side compensation inductorL rIs connected to the primary side compensation inductorL rThe other end of the first capacitor and the second capacitorC PAnd a compensation capacitorC rIs connected to a first capacitorC PAnother end of (1) and the transmitting coilL PIs connected with the different name end of the compensating capacitorC rThe other end of the first and second transistors is respectively connected with the input voltageU in Another end and a transmitting end internal resistance ofR PIs connected with the internal resistance of the transmitting terminalR PAnother end of (1) and the transmitting coilL PThe homonymous terminals of the two terminals are connected; the receiving end comprises a receiving coilL SInternal resistance of the receiving endR SA second capacitorC SAnd receiving end equivalent load resistanceR eqReception coilL SThe different name terminal of the first capacitorC SEquivalent load resistanceR eqIs connected to one end of a receiving coilL SThe same name end of the circuit is connected with the internal resistance of the receiving endR SEquivalent load resistanceR eqThe other end of the first and second connecting rods is connected; wherein the transmitting coilL PAnd a first capacitorC PIn a resonant state, the receiving coilL SAnd a second capacitorC SIn a resonant state, the transmitting coilL PAnd a receiving coilL SMutual inductance between them isM，
Figure 722814DEST_PATH_IMAGE003
In the formula
Figure 275280DEST_PATH_IMAGE004
In order to be able to determine the coupling coefficient,
Figure 886390DEST_PATH_IMAGE005
and
Figure 36749DEST_PATH_IMAGE006
the self-inductance of the transmitter coil and the receiver coil respectively,I in in order to input a current, the current is,I S for the purpose of receiving the terminal current,U out is the output voltage.
The wireless charging device of this embodiment all adopts the twin coil structure at transmitting terminal and receiving terminal, and the overlapping of transmitting terminal twin coil part guarantees that mutual inductance between them is zero, and the setting is just jointed in the tiling of receiving terminal twin coil, and the receiving coil of receiving terminal produces induced-current under the electromagnetic induction effect, realizes carrying out stable wireless charging for load battery, has simple structure, the consumptive material is few, characteristics with low costs.
The specific shapes of the transmitting coil at the transmitting end and the receiving coil at the receiving end in the wireless charging device of the present invention can be designed according to practical requirements, and preferably, in order to facilitate the wireless charging device of the present invention to be applied to existing products for barrier-free replacement, still referring to fig. 1, the first transmitting coil LP1 and the second transmitting coil LP2 are both long strips, and the first receiving coil LS1 and the second receiving coil LS2 are both long strips.
Further, the areas of the first and second transmitting coils LP1 and LP2 are equal, and the areas of the first and second receiving coils LS1 and LS2 are equal. Still referring to fig. 1, the area of the first transmitting coil LP1 is denoted as Sa, and the area of the second transmitting coil LP2 is equal to the area of the first transmitting coil LP1, also Sa.
Further, the first transmitting coil LP1 has the same structure as the second transmitting coil LP2, and the first receiving coil LS1 has the same structure as the second receiving coil LS 2. In this embodiment, the first transmitting coil LP1 and the second transmitting coil LP2 have the same structure, and the number of turns, the same size, and the same winding manner of the first transmitting coil LP 8932 and the second transmitting coil LP2 are also the same structure, and the number of turns, the same size, and the same winding manner of the first receiving coil LS1 and the second receiving coil LS2 are also the same.
As a specific embodiment, the wireless charging device further includes a contactor configured to switch a series connection between the first transmitting coil LP1 and the second transmitting coil LP2, the contactor in this embodiment may be implemented by a double-pole double-throw switch based on electromagnetic induction, the double-pole double-throw switch is respectively connected to the first transmitting coil LP1 and the second transmitting coil LP2, and when the double-pole double-throw switch is pulled to the first switching contact, the current flowing through the first transmitting coil LP1 and the current flowing through the second transmitting coil LP2 are in the same direction, and when the double-pole double-throw switch is pulled to the second switching contact, the current flowing through the first transmitting coil LP1 and the current flowing through the second transmitting coil LP2 are in opposite directions.
Further, the wireless charging apparatus further includes a first capacitor Cp1 and a second capacitor Cp2 for compensating voltages of the first transmitting coil LP1 and the second transmitting coil LP2, respectively, wherein the first capacitor Cp1 is connected in series with the first transmitting coil LP1, and the second capacitor Cp2 is connected in series with the second transmitting coil LP 2. A first capacitor to be connected in series with the synonym terminal of the transmitting coilC PThe wireless charging device is divided into two capacitors which are respectively a first capacitor Cp1 and a second capacitor Cp2, the first capacitor Cp1 and the second capacitor Cp2 are correspondingly connected with the first transmitting coil LP1 and the second transmitting coil LP2 in series respectively, and the first capacitor Cp1 and the second capacitor Cp2 are used for compensating the voltage of the first transmitting coil LP1 and the second transmitting coil LP2, so that the insulation requirement on a contactor is reduced, the insulation of the contactor caused by high voltage is avoided, and the normal operation of the wireless charging device is ensured. Preferably, the capacitance values of the first capacitor Cp1 and the second capacitor Cp2 are equal, so that the first transmitting coil LP1 and the second transmitting coil LP2 are compensated equally.
Fig. 3 is a schematic diagram of a connection mode between the double-pole double-throw switch K and one of the first transmitting coil LP1 and the second transmitting coil LP 2. As shown in fig. 3, the double-pole double-throw switch K includes a first movable contact K1, a second movable contact K2, a first fixed contact S1, a second fixed contact S2, a third fixed contact S3 and a fourth fixed contact S4, wherein the first fixed contact S1 and the third fixed contact S3 belong to the same line, the first fixed contact S1 and the third fixed contact S3 form a first switching contact of the double-pole double-throw switch K, the second fixed contact S2 and the fourth fixed contact S4 belong to the same line, and the second fixed contact S2 and the fourth fixed contact S4 form a second switching contact of the double-pole double-throw switch K; the second movable contact K2 serves as a first input voltage terminal INV1 of the transmitting coil, the first movable contact K1 is connected to the synonym terminal of the first transmitting coil LP1 through a first capacitor Cp1, the synonym terminal of the first transmitting coil LP1 serves as a second input voltage terminal INV2 of the transmitting coil, the first fixed contact S1 is connected to the synonym terminals of the fourth fixed contact S4 and the second transmitting coil LP2, respectively, the synonym terminal of the second transmitting coil LP2 is connected to one terminal of a second capacitor Cp2, and the second fixed contact S2 is connected to the other terminals of the third fixed contact S3 and the second capacitor Cp2, respectively.
When the double-pole double-throw switch K is pulled to the first switching contact, namely the double-pole double-throw switch K is attracted, still referring to fig. 3, the first movable contact K1 is in contact with the first fixed contact S1, the second movable contact K2 is in contact with the third fixed contact S3, the first input voltage end INV1, the third fixed contact S3, the second capacitor Cp2, the second transmitting coil LP2, the first fixed contact S1, the first movable contact K1, the first capacitor Cp1, the first transmitting coil LP1 and the second input voltage end INV2 form a loop, at this time, the directions of currents flowing through the first transmitting coil LP1 and the second transmitting coil LP2 are the same, the phase angle of the current in the coil is 0 degree, and the direction of most magnetic lines of force is perpendicular to the plane of the coil; when the double-pole double-throw switch K is shifted to the second switching contact, that is, the double-pole double-throw switch K is opened, the first movable contact K1 contacts the second fixed contact S2, the second movable contact K2 contacts the fourth fixed contact S4, the first input voltage terminal INV1, the fourth fixed contact S4, the second capacitor Cp2, the second transmitting coil LP2, the second fixed contact S2, the first movable contact K1, the first capacitor Cp1, the first transmitting coil LP1 and the second input voltage terminal INV2 form a loop, and at the moment, the directions of currents flowing through the first transmitting coil LP1 and the second transmitting coil LP2 are opposite, the phase angle of the current in the coil is 180 degrees, and the direction of most magnetic lines of force is parallel to the plane of the coil. Therefore, the series connection mode of the first transmitting coil LP1 and the second transmitting coil LP2 can be switched rapidly through the double-pole double-throw switch K, so that the direction of a magnetic line (magnetic field) of a transmitting end is changed, when deviation occurs between the receiving coil and the transmitting coil, excitation of the receiving end can be achieved in a self-adaptive mode, and therefore stable charging is conducted on a load, and the double-pole double-throw switch K has strong deviation resistance, adaptability and practicability.
FIG. 4 shows coupling coefficients of the wireless charging device of the present inventionkCurve of percent shift with lateral distance. As shown in FIG. 4, for the pull-in of the double-pole double-throw switch K, the current phase angle in the coil is 0 degree, and when the lateral distance deviation percentage is 0 (i.e. the transmitting coil and the receiving coil are coaxial), the coupling coefficient iskThe value of (a) approaches zero; with the transverse shift of the receiving coil, the percentage of the transverse distance shift increases, and the coupling coefficient increaseskThe value of (a) shows an increasing trend; when the percentage of lateral distance shift reaches about 25%, the coupling coefficientkThe value of (d) is maximum; as the percentage of lateral distance offset continues to increase, the coupling coefficientkThe value of (A) shows a tendency of attenuation; for the case where the double pole double throw switch K is off and the current phase angle in the coil is 180 degrees, the coupling coefficient is at 0 percent lateral distance offset (i.e., the transmitting coil is coaxial with the receiving coil)kThe value of (d) is maximum; with the transverse shift of the receiving coil, the percentage of the transverse distance shift increases, and the coupling coefficient increaseskThe value of (A) shows a tendency of attenuation; when the percentage of lateral distance shift reaches about 30%, the coupling coefficientkThe value of (a) approaches zero; as the percentage of lateral distance offset continues to increase, the coupling coefficientkIs increased but still below the maximum value. As can be seen from fig. 4, the wireless charging device of the present invention can increase the lateral offset range of the receiving coil by 1.5 times by switching the series connection of the first transmitting coil LP1 and the second transmitting coil LP2 through the double-pole double-throw switch K, which shows that the wireless charging device of the present invention has strong anti-offset characteristics and charging stability.
According to the wireless charging device of the present invention, the present invention further provides an electronic device, which includes the wireless charging device. It should be noted that the electronic device of the present invention includes, but is not limited to, an Automated Guided Vehicle (AGV), and may also be an electric Vehicle, a smart car, a mobile phone, a tablet computer, a smart watch, and the like. The electronic device provided by the embodiment of the application realizes the charging of the battery through the wireless charging device of the embodiment, and has the advantages of high wireless charging efficiency and strong anti-offset performance.
According to the wireless charging device of the present invention, the present invention further provides a wireless charging control method suitable for the wireless charging device, and the wireless charging control method of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.
Fig. 5 is a flowchart illustrating a wireless charging control method according to an embodiment of the present invention, where the wireless charging control method of the present embodiment is applied to the wireless charging device according to the foregoing embodiment, and the structure and function of the wireless charging device may refer to the description of the foregoing embodiment, which is not repeated herein. As shown in fig. 5, the wireless charging control method of the present embodiment includes the following steps:
step S100: when the power-on device is started, the double-pole double-throw switch is controlled to be pulled to one of the switching contacts, and the transmitting end starts to charge the unloaded receiving end.
When the wireless charging device is powered on, the double-pole double-throw switch K is controlled to be dialed to any one switching contact (namely, to any one of the first switching contact or the second switching contact), and the transmitting terminal starts to charge the unloaded receiving terminal. The unloaded receiving end in this embodiment refers to a receiving end without a load or a receiving end without supplying power to a load.
Step S200: and detecting the charging voltage of the receiving terminal, and judging whether the charging voltage reaches a charging threshold value.
The receiving end generates induced electromotive force under the excitation of the transmitting end, under the condition that the receiving end is in no load, the charging voltage of the receiving end is the induced electromotive force and is also the maximum output voltage of the receiving end, after the charging voltage of the receiving end is detected, whether the charging voltage reaches a charging threshold value is judged, if the charging voltage reaches the charging threshold value, the charging voltage reaches the charging requirement of the battery, and the battery can be charged; if the charging voltage does not reach the charging threshold, the charging voltage does not reach the battery charging requirement, and the battery cannot be charged.
Optionally, the charging threshold is within a range of 1.2 times to 1.5 times of the battery voltage, and only when the receiving end is in an empty load state and the charging voltage of the receiving end meets the range, it is determined that the charging voltage of the receiving end meets the battery charging requirement, and the battery can be continuously charged, so that full charging of the battery is ensured, the discharging time and the service life of the battery are prolonged, and the continuous working time of the AGV is ensured.
As a specific implementation manner, the step of providing a BUCK circuit at the receiving end, detecting the charging voltage at the receiving end, and determining whether the charging voltage reaches a charging threshold specifically includes: and detecting the charging voltage of the BUCK circuit and judging whether the charging voltage reaches a charging threshold value. The BUCK circuit, also called as a voltage reduction circuit, is used to directly charge the battery at the receiving end. For the Buck circuit, the smaller the difference value between the input voltage and the output voltage is, the higher the conversion efficiency is; the conversion efficiency is lower when the difference between the input voltage and the output voltage is larger. In the embodiment, the input voltage of the Buck circuit at the receiving end is used as the reference voltage, and whether the contact of the double-pole double-throw switch K is switched or not is determined according to the comparison result of the reference voltage and the charging threshold value so as to change the direction of the magnetic force line (magnetic field) at the transmitting end, so that the method has the advantages of high detection efficiency and accurate detection result.
Step S300: and if the charging voltage reaches the charging threshold value, controlling the transmitting terminal to continue charging the receiving terminal so that the receiving terminal charges the battery.
Step S400: if the charging voltage does not reach the charging threshold value, the transmitting terminal is stopped to charge the receiving terminal, the double-pole double-throw switch is controlled to be switched to the other switching contact, and then the transmitting terminal is controlled to charge the receiving terminal, so that the receiving terminal charges the battery.
The embodiment includes two control modes:
one is when starting up, control the double-pole double-throw switch K to dial to the first switching contact, the current phase angle is 0 degree in the coil, the direction of most magnetic lines of force is perpendicular to the coil plane, then detect the charging voltage of the receiving terminal and judge whether the charging voltage reaches the charging threshold value, if judge the charging voltage does not reach the charging threshold value, stop the inverter, thus stop the transmitting terminal to charge to the receiving terminal, dial the double-pole double-throw switch K to the second switching contact, make the direction of most magnetic lines of force change to be parallel to the coil plane, restart the inverter after the transmitting terminal charges to the receiving terminal again.
And the other method is that when the machine is started, the double-pole double-throw switch K is controlled to be pulled to the second switching contact, the current phase angle in the coil is 180 degrees, the direction of most magnetic lines of force is parallel to the plane of the coil, then the charging voltage of the receiving end is detected, whether the charging voltage reaches the charging threshold value is judged, if the charging voltage does not reach the charging threshold value is judged, the inverter is stopped, the transmitting end is stopped to charge the receiving end, the double-pole double-throw switch K is pulled to the first switching contact, the direction of most magnetic lines of force is changed to be vertical to the plane of the coil, and the transmitting end is charged to the receiving end.
No matter the wireless charging control method adopts any one of the two control modes, the transverse offset of the receiving coil can be automatically adapted, and a magnetic field with higher energy is matched and transmitted for the receiving end, so that the charging efficiency is improved.
Preferably, when the wireless charging device is powered on, the wireless charging device defaults to charge in a mode of small transmission distance, namely, the wireless charging device defaults to dial the double-pole double-throw switch K to the first switching contact point when the wireless charging device is powered on, so that the current phase angle in the coil is 0 degree, the direction of most magnetic lines of force is perpendicular to the plane of the coil, normal charging can be continued if the transverse deviation of the receiving coil is not large, if the transverse deviation is too large, the coupling coefficient is too low, the charging voltage of the detected receiving terminal cannot reach the charging threshold value, and at the moment, the double-pole double-throw switch K is switched to the second switching contact point and is changed into a 180-degree current phase angle.
According to the wireless charging control method of the present invention, the present invention further provides a wireless charging control device, and the wireless charging control device of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.
Fig. 6 is a schematic structural diagram of a wireless charging control device according to an embodiment of the present invention, the wireless charging control device of the present embodiment adopts the wireless charging control method of the foregoing embodiment, and the structure and function of the wireless charging device to which the wireless charging control method is applied can refer to the description of the foregoing embodiment, which is not repeated herein. As shown in fig. 6, the wireless charging control apparatus of the present embodiment includes:
and the starting unit 100 is used for controlling the double-pole double-throw switch to be dialed to one switching contact when starting, and the transmitting terminal starts to charge the unloaded receiving terminal.
When the wireless charging device is powered on, the power-on unit 100 controls the double-pole double-throw switch K to be toggled to any one of the switching contacts (i.e. to be toggled to any one of the first switching contact or the second switching contact), and the transmitting terminal starts to charge the idle receiving terminal. The unloaded receiving end in this embodiment refers to a receiving end without a load or a receiving end without supplying power to a load.
The detecting and determining unit 200 is configured to detect a charging voltage of the receiving end, and determine whether the charging voltage reaches a charging threshold.
The receiving end generates induced electromotive force under the excitation of the transmitting end, under the condition that the receiving end is in no load, the charging voltage of the receiving end is the induced electromotive force and is also the maximum output voltage of the receiving end, after the detection and judgment unit 200 detects the charging voltage of the receiving end, whether the charging voltage reaches a charging threshold value is judged, if the detection and judgment unit 200 judges that the charging voltage reaches the charging threshold value, the charging voltage reaches the charging requirement of the battery, and the battery can be charged; if the detecting and determining unit 200 determines that the charging voltage does not reach the charging threshold, it indicates that the charging voltage does not reach the battery charging requirement, and the battery cannot be charged.
Optionally, the charging threshold is 1.2 times to 1.5 times of the battery voltage, and only when the receiving end is in an empty state and the charging voltage of the receiving end meets the range, the detecting and determining unit 200 determines that the charging voltage of the receiving end meets the battery charging requirement, and then the battery can be continuously charged, so as to ensure that the battery is fully charged, prolong the discharging time and the service life of the battery, and improve the utilization rate of the battery.
As a specific implementation, the receiving end is provided with a BUCK circuit, and the detecting and determining unit 200 includes: and the detection and judgment module is used for detecting the charging voltage of the BUCK circuit and judging whether the charging voltage reaches a charging threshold value. The BUCK circuit, also called as a voltage reduction circuit, is used to directly charge the battery at the receiving end. For the Buck circuit, the smaller the difference value between the input voltage and the output voltage is, the higher the conversion efficiency is; the conversion efficiency is lower when the difference between the input voltage and the output voltage is larger. In the embodiment, the input voltage of the Buck circuit at the receiving end is used as the reference voltage, and whether the contact of the double-pole double-throw switch K is switched or not is determined according to the comparison result of the reference voltage and the charging threshold value so as to change the direction of the magnetic force line (magnetic field) at the transmitting end, so that the method has the advantages of high detection efficiency and accurate detection result.
The first charging control unit 300 is configured to control the transmitting terminal to continue charging the receiving terminal if the charging voltage reaches the charging threshold, so that the receiving terminal charges the battery.
And a second charging control unit 400, configured to stop the transmitting terminal from charging the receiving terminal if it is determined that the charging voltage does not reach the charging threshold, control the double-pole double-throw switch to dial to another switching contact, and then control the transmitting terminal to charge the receiving terminal, so that the receiving terminal charges the battery.
The embodiment includes two control modes:
one is that when the machine is started, the starting unit 100 controls the double-pole double-throw switch K to be shifted to the first switching contact, the current phase angle in the coil is 0 degree, the direction of most magnetic lines of force is vertical to the plane of the coil, then the detection and judgment unit 200 detects the charging voltage of the receiving end and judges whether the charging voltage reaches the charging threshold value, if the charging voltage does not reach the charging threshold value, the second charging control unit 400 stops the inverter, thereby stopping the charging of the transmitting end to the receiving end, the double-pole double-throw switch K is shifted to the second switching contact, the direction of most magnetic lines of force is changed to be parallel to the plane of the coil, and the transmitting end charges the receiving end again after restarting the inverter.
The other is that when the device is started, the starting unit 100 controls the double-pole double-throw switch K to be pulled to the second switching contact, the current phase angle in the coil is 180 degrees, the direction of most magnetic lines of force is parallel to the plane of the coil, then the detection and judgment unit 200 detects the charging voltage of the receiving end and judges whether the charging voltage reaches the charging threshold value, if the charging voltage does not reach the charging threshold value, the second charging control unit 400 stops the inverter, thereby stopping the charging of the transmitting end to the receiving end, the double-pole double-throw switch K is pulled to the first switching contact, the direction of most magnetic lines of force is changed to be perpendicular to the plane of the coil, and the transmitting end charges the receiving end again after the inverter is restarted.
No matter the wireless charging control device adopts any one of the two control modes, the transverse offset of the receiving coil can be automatically adapted, and a magnetic field with higher energy is matched and transmitted for the receiving end, so that the charging efficiency is improved.
Preferably, when the wireless charging device is powered on, the wireless charging device defaults to charge in a manner of small transmission distance, that is, the power-on unit 100 defaults to dial the double-pole double-throw switch K to the first switching contact point when the power-on unit is powered on, so that the current phase angle in the coil is 0 degree, and the direction of most magnetic lines of force is perpendicular to the plane of the coil, at this time, if the lateral deviation of the receiving coil is not large, normal charging can be continued, if the lateral deviation is too large, the coupling coefficient is too low, the charging voltage of the receiving terminal detected by the detection and judgment unit 200 does not reach the charging threshold, and at this time, the second charging control unit 400 switches the double-pole double-throw switch K to the second switching contact.
According to the technical scheme of the wireless charging control method and the wireless charging control device, the method and the wireless charging control device realize the switching control of the series connection mode of the first transmitting coil and the second transmitting coil based on the comparison result of the charging voltage of the receiving end and the charging threshold and the double-pole double-throw switch, so that the direction of the magnetic force line is changed, the direction of the magnetic force line is changed in a self-adaptive manner according to the transverse offset of the receiving coil, the wireless charging device has strong offset resistance, adaptability and practicability, and the wireless charging control method and the wireless charging control device have the advantages of high control reliability and high sensitivity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A wireless charging control method is suitable for a wireless charging device, the wireless charging device comprises a transmitting end and a receiving end, the transmitting end comprises a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are partially overlapped to realize that mutual inductance after the first transmitting coil and the second transmitting coil are electrified is zero, and the wireless charging control method is characterized by comprising the following steps:
when the power-on device is started, the double-pole double-throw switch is controlled to be switched to one switching contact, so that the directions of currents flowing through the first transmitting coil and the second transmitting coil are the same or opposite, and the transmitting end starts to charge the unloaded receiving end;
detecting the charging voltage of the receiving end and judging whether the charging voltage reaches a charging threshold value;
if yes, controlling the transmitting terminal to continue charging the receiving terminal so that the receiving terminal charges a battery;
if not, judging that the receiving coil of the receiving end has overlarge transverse offset, stopping charging the receiving end by the transmitting end, controlling the double-pole double-throw switch to be switched to another switching contact so as to enable the directions of currents flowing through the first transmitting coil and the second transmitting coil to be opposite or the same, and then controlling the transmitting end to charge the receiving end so as to enable the receiving end to charge the battery;
the switching of the direction of the magnetic force line at the transmitting end between the vertical direction and the horizontal direction can be realized by using a set of inverter circuits.
2. The wireless charging control method according to claim 1, wherein the receiving end is provided with a BUCK circuit, the charging threshold is in a range of 1.2 times to 1.5 times of a battery voltage, and the step of detecting the charging voltage of the receiving end and determining whether the charging voltage reaches the charging threshold specifically comprises:
and detecting the charging voltage of the BUCK circuit, and judging whether the charging voltage reaches the charging threshold value.
3. The wireless charging control method according to claim 1, wherein the first transmission coil and the second transmission coil are equal in area.
4. The wireless charging control method according to claim 3, wherein the first transmission coil and the second transmission coil are identical in structure.
5. The wireless charging control method according to claim 1, wherein the wireless charging device further comprises a first capacitor and a second capacitor, the first capacitor is connected in series with the first transmitting coil, and the second capacitor is connected in series with the second transmitting coil.
6. A wireless charging control device is suitable for a wireless charging device, the wireless charging device comprises a transmitting terminal and a receiving terminal, the transmitting terminal comprises a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are partially overlapped to realize that mutual inductance after the first transmitting coil and the second transmitting coil are electrified is zero, and the wireless charging control device is characterized by comprising:
the starting unit is used for controlling the double-pole double-throw switch to be poked to one switching contact when starting, so that the current directions flowing through the first transmitting coil and the second transmitting coil are the same or opposite, and the transmitting end starts to charge the unloaded receiving end;
the detection and judgment unit is used for detecting the charging voltage of the receiving end and judging whether the charging voltage reaches a charging threshold value;
the first charging control unit is used for controlling the transmitting terminal to continue to charge the receiving terminal if the charging voltage is judged to reach the charging threshold value, so that the receiving terminal charges a battery;
the second charging control unit is used for judging that the receiving coil of the receiving end has overlarge transverse offset if the charging voltage does not reach the charging threshold value, stopping charging the receiving end by the transmitting end, controlling the double-pole double-throw switch to be switched to another switching contact so as to enable the directions of currents flowing through the first transmitting coil and the second transmitting coil to be opposite or the same, and then controlling the transmitting end to charge the receiving end so as to enable the receiving end to charge the battery;
the switching of the direction of the magnetic force line at the transmitting end between the vertical direction and the horizontal direction can be realized by using a set of inverter circuits.
7. The wireless charging control device according to claim 6, wherein the receiving terminal is provided with a BUCK circuit, the charging threshold is in a range of 1.2 times to 1.5 times of a battery voltage, and the detecting and determining unit includes:
and the detection and judgment module is used for detecting the charging voltage of the BUCK circuit and judging whether the charging voltage reaches the charging threshold value.
8. The wireless charging control device of claim 6, wherein the first transmitting coil and the second transmitting coil are equal in area.
9. The wireless charging control device of claim 8, wherein the first transmitting coil and the second transmitting coil are identical in structure.
10. The wireless charging control device of claim 6, further comprising a first capacitor in series with the first transmit coil and a second capacitor in series with the second transmit coil.
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