CN112262515A

CN112262515A - Wireless charging device, system and method

Info

Publication number: CN112262515A
Application number: CN201880094347.3A
Authority: CN
Inventors: 万世铭
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-04-12
Filing date: 2018-04-12
Publication date: 2021-01-22
Also published as: WO2019196072A1

Abstract

The application provides a wireless charging device, a wireless charging system and a wireless charging method, which can realize the adjustment of the position of a transmitting coil, thereby improving the charging efficiency and improving the user experience. The device includes: a housing; the transmitting coil is arranged in the shell and used for transmitting wireless electromagnetic signals; the adjusting mechanism is used for adjusting the position of the transmitting coil in the shell and comprises a guide rail, a first traction object, a second traction object and at least one motor, wherein one end of the first traction object is arranged at the guide rail and is connected with the second traction object, the other end of the first traction object is connected with the motor through a fixing part fixed relative to the shell, the transmitting coil is arranged on the first traction object, the motor drives the second traction object, so that one end of the first traction object moves along the guide rail, and the motor drives the first traction object to move the transmitting coil between one end of the first traction object and the fixing part.

Description

Wireless charging device, system and method

Technical Field

Embodiments of the present application relate to the field of charging, and more particularly, to a wireless charging device, system, and method.

Background

Along with the popularization of wireless charging, more and more electronic equipment all supports wireless function of charging, and transmitting coil on the current wireless charging base is fixed on the base, and this has just led to the equipment when placing the base on, and the user needs to find the position accurately, and in case positional deviation, charging efficiency will reduce, seriously influences user experience.

Disclosure of Invention

The application provides a wireless charging device, a wireless charging system and a wireless charging method, which can realize the adjustment of the position of a transmitting coil, thereby improving the charging efficiency and improving the user experience.

In one aspect, a wireless charging apparatus is provided, including: a housing; the transmitting coil is arranged in the shell and used for transmitting a wireless electromagnetic signal so as to wirelessly charge the equipment to be charged, which is provided with the receiving coil; the adjusting mechanism is used for adjusting the position of the transmitting coil in the shell and comprises a guide rail, a first traction object, a second traction object and at least one motor, wherein one end of the first traction object is arranged at the guide rail and is connected with the second traction object, the other end of the first traction object is connected with the motor through a fixing part fixed relative to the shell, the transmitting coil is arranged on the first traction object, the motor drives the second traction object, so that one end of the first traction object moves along the guide rail, and the motor drives the first traction object to move the transmitting coil between one end of the first traction object and the fixing part.

In another aspect, a wireless charging system is provided, which includes a wireless charging apparatus and a device to be charged that is wirelessly charged by using a wireless charging terminal apparatus, wherein the wireless charging apparatus includes: a housing; the transmitting coil is arranged in the shell and used for transmitting a wireless electromagnetic signal so as to wirelessly charge the equipment to be charged, which is provided with the receiving coil; the adjusting mechanism is used for adjusting the position of the transmitting coil in the shell and comprises a guide rail, a first traction object, a second traction object and at least one motor, wherein one end of the first traction object is arranged at the guide rail and is connected with the second traction object, the other end of the first traction object is connected with the motor through a fixing part fixed relative to the shell, the transmitting coil is arranged on the first traction object, the motor drives the second traction object, so that one end of the first traction object moves along the guide rail, and the motor drives the first traction object to move the transmitting coil between one end of the first traction object and the fixing part.

In another aspect, a wireless charging method is provided, including: transmitting a wireless electromagnetic signal by using a transmitting coil arranged in a shell of the wireless charging device so as to be used for wirelessly charging the equipment to be charged with a receiving coil; controlling the movement of the motor to drive a first traction device and/or a second traction device, so that the transmitting coil moves between one end of the first traction device and a fixing part fixed relative to the shell, and/or one end of the first traction device moves along a guide rail, wherein one end of the first traction device is arranged at the guide rail and connected with the second traction object, the other end of the first traction device is connected with the motor through the fixing part, and the transmitting coil is arranged on the first traction device.

In the scheme of the application, therefore, the wireless charging device comprises an adjusting mechanism for adjusting the position of the transmitting coil in the shell, thereby realizing the automatic calibration of the position of the transmitting coil, improving the charging efficiency and the user experience, and the adjusting mechanism comprises a guide rail, a first traction object, a second traction object and at least one motor, wherein one end of the first traction device is arranged at the guide rail and is connected with the second traction object, the other end of the first traction device is connected with the motor through a fixing part fixed relative to the shell, the transmitting coil is arranged on the first traction device, wherein the motor drives the second pulling piece to make one end of the first pulling piece move along the guide rail, the motor drives the first pulling piece, the transmitting coil is moved between the one end of the first pulling member and the fixing portion, and the position of the transmitting coil in the two-dimensional plane can be adjusted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a wireless charging system according to the present application.

Fig. 2 is a schematic block diagram of a wireless charging device according to an embodiment of the present application.

Fig. 3 is a schematic block diagram of a device to be charged according to an embodiment of the present application.

Fig. 4 is a schematic block diagram of a device to be charged according to an embodiment of the present application.

Fig. 5 is a schematic block diagram of a wireless charging device according to an embodiment of the present application.

Fig. 6 is a schematic diagram of an adjustment mechanism according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a wireless charging device according to an embodiment of the present application.

FIG. 8 is a schematic diagram of an arrangement of infrared thermal sensors according to an embodiment of the application.

FIG. 9 is a schematic diagram of a pressure sensor according to an embodiment of the present application.

Fig. 10 is a schematic diagram of a pressure sensor provided with a device to be charged according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a positional relationship of a transmit coil and a receive coil according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a wireless charging method according to an embodiment of the application.

Detailed Description

The charging method and the charging device have the advantages that the charging device to be charged is charged based on the wireless charging technology, the wireless charging technology can complete power transmission without a cable, and operation in a charging preparation stage can be simplified.

The wireless charging technology generally connects a power supply device (e.g., an adapter) to a wireless charging apparatus (e.g., a wireless charging base), and wirelessly transmits output power of the power supply device (e.g., an electromagnetic signal) to a device to be charged through the wireless charging apparatus, so as to wirelessly charge the device to be charged.

According to different wireless charging principles, wireless charging methods are mainly classified into three methods, namely magnetic coupling (or electromagnetic induction), magnetic resonance and radio wave. Currently, the mainstream wireless charging standards include QI standard, power association (PMA) standard, and wireless power association (A4 WP). The QI standard and the PMA standard both adopt a magnetic coupling mode for wireless charging. The A4WP standard uses magnetic resonance for wireless charging.

Fig. 1 is a schematic block diagram of a wireless communication system 10 according to an embodiment of the present application.

As shown in fig. 1, the wireless charging system 10 includes: a power supply device 100, a wireless charging apparatus 200, and a device to be charged 300.

Optionally, in the embodiment of the present application, the power supply device 100 is configured to supply direct current to the wireless charging apparatus 200. The power supply apparatus 100 may include: the rectifier circuit, the transformer circuit, the control circuit, the charging interface and the like can convert alternating current input into direct current output so as to provide the direct current output for the wireless charging device 200. For example, the power supply apparatus 100 may be an adapter, a power pack, a vehicle power supply, or the like.

Alternatively, in the embodiment of the present application, the power supply apparatus 100 may also directly supply the alternating current to the wireless charging device 200. For example, the power supply apparatus 100 may be an ac power supply. When the power supply apparatus 100 is an ac power supply, the wireless charging device 200 further includes a circuit or a module for converting ac power into DC power, such as a rectifying filter circuit and a DC/DC conversion circuit.

The wireless charging device 200 is configured to convert the direct current or alternating current provided by the power supply apparatus 100 into an electromagnetic signal, so as to perform power transmission in a wireless manner.

The interface between the power supply device 100 and the wireless charging apparatus 200 may be a Universal Serial Bus (USB) interface or a lightning (lightning) interface.

Fig. 2 is a schematic block diagram of a wireless charging device 200 according to an embodiment of the present application.

As shown in fig. 2, the wireless charging device 200 includes: a rectifier filter circuit (not shown), a Direct Current (DC)/DC conversion circuit (not shown), a wireless transmission circuit 201 including a transmission coil 202, a first control circuit 204, and a first communication circuit 205.

The 220V alternating current can be converted into stable direct current through a rectifying and filtering circuit, and then the voltage is regulated to a fixed value through the conversion of a DC/DC conversion circuit to be supplied to the wireless transmitting circuit 201.

It should be understood that the rectifying and filtering circuit and the DC/DC converting circuit are optional, and as described above, when the power supply apparatus 100 is an alternating current power supply, the wireless charging device 200 may be provided with the rectifying and filtering circuit and the DC/DC converting circuit. When the power supply apparatus 100 can supply a stable direct current, the rectifying filter circuit and/or the DC/DC conversion circuit can be eliminated.

A wireless transmitting circuit 201, for converting the direct current provided by the DC/DC converting circuit or the direct current provided by the power supply equipment into an alternating current which can be coupled to the transmitting coil 202, and converting the alternating current into an electromagnetic signal by the transmitting coil for transmission.

Optionally, in this embodiment of the present application, the wireless transmitting circuit 201 may include: an inverter circuit and a resonant circuit. The inverter circuit may include a plurality of switching tubes, and the magnitude of the output power may be adjusted by controlling the on-time (duty ratio) of the switching tubes. A resonant circuit for transferring electrical energy away, for example, may include a capacitor and a transmitting coil. By adjusting the resonant frequency of the resonant circuit, the output power of the wireless transmission circuit 201 can be adjusted.

Optionally, in the embodiment of the present application, the wireless charging apparatus 200 may be a wireless charging base or a device with an energy storage function. When the wireless charging apparatus 200 is a device having an energy storage function, it further includes an energy storage module (e.g., a lithium battery) that can obtain and store electric energy from an external power supply device. Thus, the energy storage module may provide power to the wireless transmit circuit 201. It should be understood that the wireless charging apparatus 200 may obtain power from an external power supply device by wire or wirelessly. The wired connection, for example, connects with an external power supply device through a charging interface (e.g., Type-C interface) to obtain power. For example, the wireless charging apparatus 200 includes a wireless receiving circuit, which can wirelessly receive power from a device having a wireless charging function.

The first control circuit 204 is configured to control a wireless charging process. For example, the first control circuit 204 may control the communication of the first communication circuit 205 with the power supply device to determine the output voltage and/or the output current of the power supply device. Alternatively, the first control circuit 204 may also control the communication of the first communication circuit 205 with the device to be charged, enable interaction of charging information (e.g., battery 305 voltage information, battery 305 temperature information, charging mode information, etc. of the device to be charged), determination of charging parameters (e.g., charging voltage and/or charging current) for wireless charging, and the like.

It should be understood that the wireless charging device 200 may also include other related hardware, logic devices, circuitry, and/or code to achieve the corresponding functionality. For example, the wireless charging device 200 may further include a display module (e.g., a light emitting diode or an LED display screen) for displaying the charging status in real time (e.g., charging is in progress or terminated, etc.) during the wireless charging process.

As shown in fig. 2, in an embodiment of the present application, the wireless charging device 200 further includes: a voltage conversion circuit 203. The voltage conversion circuit 203 is configured to perform voltage conversion on the current supplied to the wireless transmission circuit 201 when the voltage of the current supplied to the wireless transmission circuit 201 does not satisfy a preset condition. As previously mentioned, in one embodiment, the current provided to the wireless transmit circuitry 201 may be provided by DC/DC conversion circuitry, by a power supply device, by the aforementioned energy storage module, or the like.

Of course, alternatively, if the voltage supplied to the wireless transmission circuit 201 can reach the voltage requirement of the wireless transmission circuit 201 for the input voltage, the voltage conversion circuit 203 may be omitted to simplify the implementation of the wireless charging apparatus. The voltage requirement of the wireless transmitting circuit 201 for the input voltage can be set according to the actual requirement, for example, to 10V.

Alternatively, in the embodiment of the present application, the fact that the voltage of the current supplied to the wireless transmission circuit 201 cannot satisfy the preset condition means that the voltage is lower than the required voltage of the wireless transmission circuit 201 or the voltage is higher than the required voltage of the wireless transmission circuit 201. For example, if a charging mode with high voltage and low current (e.g., 20V/1A) is used for wireless charging, the input voltage of the wireless transmitting circuit 201 is required to be higher (e.g., the voltage requirement is 10V or 20V). If the voltage supplied to the wireless transmission circuit 201 cannot meet the voltage requirement of the wireless transmission circuit 201, the voltage conversion circuit 203 may boost the input voltage to meet the voltage requirement of the wireless transmission circuit 201. If the output voltage of the power supply device exceeds the voltage requirement of the wireless transmission circuit 201, the voltage conversion circuit 203 may step down the input voltage to meet the voltage requirement of the wireless transmission circuit 201.

Fig. 3 and 4 are schematic block diagrams of a device 300 to be charged according to an embodiment of the present application.

As shown in fig. 3 and 4, the device to be charged 300 includes: a wireless receiving circuit 301 including a receiving coil 311, a second control circuit 302, a voltage step-down circuit 303, a detection circuit 304, a battery 305, and a first charging path 306 and a second communication circuit 309.

Alternatively, in the embodiment of the present application, the wireless receiving circuit 301 is configured to convert the electromagnetic signal transmitted by the wireless transmitting circuit 201 of the wireless charging device 200 into an alternating current through the receiving coil 311, and perform rectification and/or filtering operations on the alternating current to convert the alternating current into a stable direct current to charge the battery 305.

Optionally, in this embodiment of the present application, the wireless receiving circuit 301 includes: a receiving coil 311 and an Alternating Current (AC)/DC conversion circuit. And an AC/DC conversion circuit for converting the alternating current received by the receiving coil 311 into direct current.

Alternatively, in the embodiment of the present application, the battery 305 may include a single cell or multiple cells. When the battery 305 includes multiple cells, the multiple cells are connected in series. Therefore, the charging voltage which can be borne by the battery 305 is the sum of the charging voltages which can be borne by a plurality of battery cells, the charging speed can be increased, and the charging heat emission can be reduced.

Taking the device to be charged as a mobile phone as an example, when the battery 305 of the device to be charged includes a single cell, the voltage of the internal single cell is generally between 3.0V and 4.35V. When the battery 305 of the device to be charged includes two cells connected in series, the total voltage of the two cells connected in series is 6.0V to 8.7V. Therefore, compared with a single battery cell, when a plurality of battery cells are connected in series, the output voltage of the wireless receiving circuit 301 can be increased. Compared with a single battery cell, the charging speed is equal, and the charging current required by the multiple battery cells is about 1/N (N is the number of the battery cells which are connected in series in the equipment to be charged) of the charging current required by the single battery cell. In other words, on the premise of ensuring the same charging speed (the same charging power), the scheme of multiple battery cells is adopted, so that the magnitude of the charging current can be reduced, and the heat productivity of the equipment to be charged in the charging process is reduced. On the other hand, compared with the single-cell scheme, the charging voltage can be increased by adopting the multi-cell series scheme under the condition that the charging current is kept the same, so that the charging speed is increased.

Optionally, in the embodiment of the present application, the first charging channel 306 may be a wire. A voltage step-down circuit 303 may be disposed on the first charging path 306.

The voltage reducing circuit 303 is configured to reduce the dc power output by the wireless receiving circuit 301 to obtain an output voltage and an output current of the first charging channel 306. In an alternative embodiment, the voltage and current values of the dc power output by the first charging channel 306, which meet the charging requirements of the battery 305, can be directly applied to the battery 305.

The detection circuit 304 is used for detecting a voltage value and/or a current value of the first charging channel 306. The voltage value and/or the current value of the first charging channel 306 may refer to a voltage value and/or a current value between the wireless receiving circuit 301 and the voltage dropping circuit 303, that is, an output voltage value and/or a current value of the wireless receiving circuit 301. Alternatively, the voltage value and/or the current value on the first charging channel 306 may also refer to the voltage value and/or the current value between the voltage-reducing circuit 303 and the battery 305, i.e. the output voltage and/or the output current of the voltage-reducing circuit 303.

Optionally, in this embodiment of the present application, the detection circuit 304 may include: a voltage detection circuit and a current detection circuit. The voltage detection circuit may be configured to sample the voltage on the first charging channel 306 and send the sampled voltage value to the second control circuit 302. In an alternative embodiment, the voltage detection circuit may sample the voltage on the first charging channel 306 by serially dividing the voltage. The current detection circuit 304 may be configured to sample the current on the first charging channel 306 and send the sampled current value to the second control circuit 302. In some embodiments, the current detection circuit 304 may sample the current on the first charging channel 306 through a current sensing resistor and a current sensing meter.

Optionally, in this embodiment of the application, the second control circuit 302 may control the second communication circuit 309 to communicate with the wireless charging device, and feed back the voltage value and/or the current value detected by the detection circuit 304 to the wireless charging device. Thus, the first control circuit 204 of the wireless charging device can adjust the transmission power of the wireless transmission circuit 201 according to the feedback voltage value and/or current value, so that the voltage value and/or current value of the direct current output by the first charging channel 306 matches with the charging voltage value and/or current value required by the battery 305.

It should be understood that in the embodiment of the present application, "matching with the required charging voltage value and/or current value of the battery 305" includes: the voltage and/or current values of the dc power output by the first charging channel 306 are equal to or float within a predetermined range (e.g., 100 mv to 200 mv above and below) of the charging voltage and/or current values required by the battery 305.

In the embodiment of the present application, the voltage reduction circuit 303 may be implemented in various forms. As one example, the voltage-reducing circuit 303 may be a Buck circuit. As another example, the voltage-reducing circuit 303 may be a charge pump (charge pump). The charge pump is composed of a plurality of switching devices, and the heat generated when the current flows through the switching devices is very small and almost equal to the heat generated when the current directly passes through a conducting wire, so that the charge pump is used as the voltage reduction circuit 303, not only can the voltage reduction effect be achieved, but also the heating is low. The voltage step-down circuit 303 may also be a half-voltage circuit, as one example.

Optionally, in this embodiment of the present application, the setting of the voltage-boosting multiple of the voltage converting circuit 203 of the wireless charging apparatus 200 and the voltage-reducing multiple of the voltage-reducing circuit 303 of the device to be charged 300 is related to parameters such as an output voltage that can be provided by the power supply device and a charging voltage that is required by the battery 305, and the two parameters may be equal or unequal, which is not specifically limited in this embodiment of the present application.

Alternatively, in the embodiment of the present application, the voltage boosting multiple of the voltage conversion circuit 203 and the voltage reducing multiple of the voltage reducing circuit 303 may be set to be equal. For example, the voltage conversion circuit 203 may be a voltage doubler circuit for boosting the output voltage of the power supply device by 2 times; the voltage-decreasing circuit 303 may be a half-voltage circuit for decreasing the output voltage of the wireless receiving circuit 301 by half.

Optionally, in this embodiment of the present application, the voltage-boosting multiple of the voltage converting circuit 203 and the voltage-reducing multiple of the voltage-reducing circuit 303 are set to be 1:1, and this setting manner may enable the output voltage and the output current of the voltage-reducing circuit 303 to be respectively consistent with the output voltage and the output current of the power supply device, which is beneficial to simplifying the implementation of the control circuit. Taking the requirement of the battery 305 for the charging current as 5A as an example, when the second control circuit 302 knows that the output current of the voltage reduction circuit 303 is 4.5A through the detection circuit 304, the output power of the power supply device needs to be adjusted so that the output current of the voltage reduction circuit 303 reaches 5A. If the ratio of the voltage-boosting multiple of the voltage conversion circuit 203 to the voltage-reducing multiple of the voltage-reducing circuit 303 is not equal to 1:1, when the output power of the power supply apparatus is adjusted, the first control circuit 204 or the second control circuit 302 needs to recalculate the adjustment value of the output power of the power supply apparatus based on the difference between the current output current of the voltage-reducing circuit 303 and the desired value. In an embodiment of the present application, the ratio of the voltage-boosting multiple of the voltage conversion circuit 203 to the voltage-reducing multiple of the voltage-reducing circuit 303 is set to 1:1, and then the second control circuit 302 notifies the first control circuit 204 to boost the output current to 5A, thereby simplifying the feedback adjustment manner of the wireless charging path.

As shown in fig. 4, in the embodiment of the present application, the device to be charged 300 may further include: a second charging channel 308. The second charging channel 308 may be a conductive wire. A conversion circuit 307 may be disposed on the second charging channel 308 for performing voltage control on the dc power output by the wireless receiving circuit 301, so as to obtain an output voltage and an output current of the second charging channel 308, so as to charge the battery 305.

Optionally, in this embodiment of the present application, the converting circuit 307 includes: a circuit for stabilizing voltage and a circuit for realizing constant current and constant voltage. The circuit for voltage stabilization is connected to the wireless receiving circuit 301, and the circuit for constant current and constant voltage is connected to the battery 305.

When the second charging channel 308 is used to charge the battery 305, the wireless transmitting circuit 201 may use a constant transmitting power, and after the wireless receiving circuit 301 receives the electromagnetic signal, the electromagnetic signal is processed by the converting circuit 307 into a voltage and a current meeting the charging requirement of the battery 305, and then the voltage and the current are input to the battery 305 to charge the battery 305. It should be understood that in some embodiments, a constant transmit power need not be a transmit power that remains completely constant, and may vary within a range, for example, a transmit power of 7.5W floating up or down by 0.5W.

Optionally, in the embodiment of the present application, when the battery 305 is charged through the second charging channel 308, the wireless charging device and the device to be charged may perform wireless charging according to the Qi standard.

Optionally, in this embodiment of the present application, a voltage conversion circuit is disposed at the wireless charging device. A first charging channel 306 (e.g., a wire) is provided on the device to be charged that is connected to the battery 305. The first charging channel 306 is provided with a voltage reduction circuit 303 for reducing the output voltage of the wireless receiving circuit 301, so that the output voltage and the output current of the first charging channel 306 meet the charging requirement of the battery 305.

Alternatively, in the embodiment of the present application, if the wireless charging apparatus 200 charges the single-cell battery 305 in the device to be charged with the output power of 20W, when the single-cell battery 305 is charged with the second charging channel 308, the input voltage of the wireless transmitting circuit 201 needs to be 5V, the input current needs to be 4A, and the use of the current of 4A inevitably causes the coil to generate heat, thereby reducing the charging efficiency.

When the single-cell battery 305 is charged by using the first charging channel 306, since the voltage-reducing circuit 303 is disposed on the first charging channel 306, the input voltage of the wireless transmitting circuit 201 can be increased without changing the transmitting power of the wireless transmitting circuit 201 (20W as described above), and thus, the input current of the wireless transmitting circuit 201 can be reduced.

Alternatively, in this embodiment of the present application, the voltage-reducing circuit 303 may adopt a half-voltage circuit, that is, the ratio of the input voltage and the output voltage of the voltage-reducing circuit 303 is a fixed value of 2: 1 to further reduce the heat generation of the step-down circuit 303.

It is understood that the wireless receiving circuit 301 may intermittently charge the battery 305, and the period of the output current of the wireless receiving circuit 301 may vary with the frequency of the alternating current input to the wireless charging system, such as the ac power grid, for example, the period of the output current of the wireless receiving circuit 301 corresponds to a frequency that is an integer multiple or an inverse multiple of the frequency of the power grid. Also, when the output current of the wireless receiving circuit 301 may intermittently charge the battery 305, the current waveform corresponding to the output current of the wireless receiving circuit 301 may be one or a set of pulses synchronized with the power grid. Compared with the traditional constant direct current, the pulse voltage/current periodic transformation can reduce the lithium precipitation phenomenon of the lithium battery, prolong the service life of the battery, and is beneficial to reducing the polarization effect of the battery, improving the charging speed and reducing the heat generation of the battery, thereby ensuring the safety and reliability of the equipment to be charged during charging.

Alternatively, in the present embodiment, the wireless charging device 200 may be provided in various shapes, for example, a circle, a square, and the like.

Optionally, in the embodiment of the present application, many other communication information may also be exchanged between the first communication circuit 205 and the second communication circuit 309. In some embodiments, information for safety protection, abnormality detection, or fault handling, such as temperature information of the battery 305, information indicating overvoltage protection or overcurrent protection, and power transfer efficiency information (which may be used to indicate power transfer efficiency between the wireless transmitting circuit 201 and the wireless receiving circuit 301) may be exchanged between the first communication circuit 205 and the second communication circuit 309.

For example, when the temperature of the battery 305 is too high, the first control circuit 204 and/or the second control circuit 302 may control the charging loop to enter a protection state, such as controlling the charging loop to stop wireless charging. For another example, after the first control circuit 204 receives the indication information of the overvoltage protection or the overcurrent protection sent by the second control circuit 302 through the second communication circuit 309, the first control circuit 204 may reduce the transmission power or control the wireless transmission circuit 201 to stop operating. As another example, after the first control circuit 204 receives the power transmission efficiency information sent by the second control circuit 302 through the second communication circuit 309, if the power transmission efficiency is lower than the preset threshold, the wireless transmission circuit 201 may be controlled to stop working, and the user may be notified of the event, for example, the power transmission efficiency is too low through the display screen, or the power transmission efficiency may be indicated by the indicator lamp, so that the user can adjust the environment of the wireless charging.

Optionally, in the embodiment of the present application, other information that can be used to adjust the transmission power adjustment of the wireless transmission circuit 201, such as temperature information of the battery 305, information indicating a peak value or an average value of the voltage and/or current on the first charging channel 306, power transfer efficiency information (which may be used to indicate the power transfer efficiency between the wireless transmission circuit 201 and the wireless reception circuit 301), and the like, may be interacted between the first communication circuit 205 and the second communication circuit 309.

For example, the second communication circuit 309 may transmit power transfer efficiency information to the first communication circuit 205, and the first control circuit 204 may determine the adjustment magnitude of the transmission power of the wireless transmission circuit 201 from the power transfer efficiency information received by the first communication circuit 205. Specifically, if the power transfer efficiency information indicates that the power transfer efficiency between the wireless transmission circuit 201 and the wireless reception circuit 301 is low, the first control circuit 204 may increase the adjustment amplitude of the transmission power of the wireless transmission circuit 201 so that the transmission power of the wireless transmission circuit 201 quickly reaches the target power.

As another example, if the wireless receiving circuit 301 outputs a voltage and/or a current with a pulsating waveform, the second control circuit 302 may send information indicating a peak value or a mean value of the output voltage and/or the output current of the first charging channel 306 to the first control circuit 204, the first control circuit 204 may determine whether the peak value or the mean value of the output voltage and/or the output current of the first charging channel 306 matches a charging voltage and/or a charging current currently required by the battery 305, and if not, the transmitting power of the wireless transmitting circuit 201 may be adjusted.

As another example, the second communication circuit 309 may send the temperature information of the battery 305 to the first communication circuit 205, and if the temperature of the battery 305 is too high, the first control circuit 204 may decrease the transmission power of the wireless transmission circuit 201 to decrease the output current of the wireless reception circuit 301, thereby decreasing the temperature of the battery 305.

The charging process of the battery may include one or more of a trickle charge phase, a constant current charge phase and a constant voltage charge phase. During the trickle charge phase, the current into the battery 305 satisfies a charge current level (e.g., a first charge current) expected by the battery 305. During the constant current charging phase, the current into the battery 305 satisfies the expected charging current level of the battery 305 (e.g., a second charging current, which may be greater than the first charging current). During the constant voltage charging phase, the magnitude of the voltage applied across the battery 305 satisfies the expected charging voltage magnitude of the battery 305.

In the wireless charging process, when the transmitting coil 202 and the receiving coil 311 are spatially aligned, the charging efficiency is the highest. However, the transmitting coil 202 is generally disposed in the housing of the wireless charging device 200, if the transmitting coil 202 is fixed in the housing, the user needs to find the position when placing the device to be charged on the wireless charging device 200, and once the position is deviated, the charging efficiency is reduced, which seriously affects the user experience.

To this end, the embodiment of the present application provides an adjustment mechanism in the wireless charging device, which can adjust the position of the transmitting coil in the housing.

As shown in fig. 5, the wireless charging device 400 may include a housing 410, a transmitting coil 420, and an adjustment mechanism 430.

The housing 410 of the embodiment of the present application may be circular, square, or oval, among others.

A transmitting coil 420 may be disposed within the housing 410 for transmitting a wireless electromagnetic signal for wirelessly charging a device to be charged disposed with the receiving coil.

It should be understood that the transmitting coil in the embodiments of the present application may also be referred to as a transmitting antenna, and the receiving coil in the embodiments of the present application may also be referred to as a receiving antenna.

In addition, the structural configuration of the transmitting coil and the receiving coil is not particularly limited in the embodiments of the present application, and for example, the transmitting coil or the receiving coil may be circular, square, or elliptical.

The adjustment mechanism 430 may adjust the position of the transmit coil 420 within the housing 410.

Wherein the motion area of the transmitting coil 420 may be circular, square or elliptical, etc.

The area of the moving region of the transmitting coil 420 may be smaller than the area of the inner region of the case 410, and the shape of the moving region of the transmitting coil 420 may be the same as or different from the shape of the case 410.

Therefore, in this application embodiment, set up guiding mechanism among the wireless charging device to can control this guiding mechanism and adjust the position of transmitting coil in the casing, thereby can realize the automatic calibration of transmitting coil's position, thereby improve charging efficiency, promote user experience.

For a clearer understanding of the present application, the adjusting mechanism will be described below.

As shown in fig. 6, the adjustment mechanism 500 (which may correspond to the adjustment mechanism 430 shown in fig. 5) may include a guide rail 523, a first pulling member (which may be composed of, for example, a first pulling wire 511 and a first spring 512), a second pulling member (which may be composed of, for example, a second pulling wire 521 and a second spring 522), and at least one motor 531, wherein one end of the first pulling member is disposed at the guide rail 523 and connected to the second pulling member, the other end of the first pulling member is connected to the motor 531 via a fixing portion 514 fixed with respect to the housing of the wireless charging device, the transmitting coil 420 is disposed on the first pulling member, the motor 531 drives the second pulling member such that the one end of the first pulling member moves along the guide rail 523, and the motor 531 drives the first pulling member such that the transmitting coil 420 moves between the one end of the first pulling member and the fixing portion 514.

Optionally, in the present embodiment, the first retractor comprises a first retractor wire 511 and a first spring 512; one end of the first pulling wire 511 is connected with one end of the first spring 512, the other end of the first spring 512 is formed as one end of a first pulling object to be connected with the second pulling object, and the other end of the first pulling wire 511 is formed as the other end of the first pulling object to be connected with the motor 531; the transmitting coil 420 is connected with the first spring 512 or the first traction wire 511.

The one end of the first traction wire 511 passing through the fixing portion 514 may refer to that the first traction wire 511 passes through a hole formed in the fixing portion 514, or is wound around the fixing portion 514.

The transmitting coil 420 may be provided at the junction of the first spring 512 and the first traction wire 511, and particularly, as shown in fig. 6, a connection part 515 may be provided at the junction of the first spring 512 and the first traction wire 511, and the connection part 515 may be used to connect the first traction wire 511, the first spring 512 and the transmitting coil 420. Of course, the connection portion 515 may be connected to the first traction wire 511 without being connected to the first spring 512, or connected to the first spring 512 without being connected to the first traction wire 511.

Alternatively, in order to avoid the inclination of the transmitting coil 420 in the up-down direction, a support portion (not shown) may be provided, which may, for example, keep the transmitting coil 420 horizontal. For example, the support portion may include a tray on which the transmitting coil 420 is placed, and a leg for supporting the tray, the leg being movable.

Optionally, in the present embodiment, the second pull object includes a second pull wire 521 and a second spring 522; in the guide rail 523, one end of the second traction wire 521 is connected to one end of the second spring 522, the other end of the second traction wire 521 passes through the guide rail 523 and is connected to the motor 531, and the other end of the second spring 522 is fixed with respect to the guide rail 523.

Wherein, one end of the first pulling rod can be connected with the second pulling wire 521 or the second spring 522. Specifically, a connection portion 525 may be provided at the connection of the second traction wire 521 and the second spring 522, and the connection portion 525 is used to connect the second traction wire 521, the second spring 522 and one end of the first spring 512. The connecting portion 525 may be a slider, and the slider may be driven by the second traction wire 512 and the second spring 522 to slide along the guide rail 523, so as to drive one end of the first spring 512 to move along the guide rail 523.

It is understood that the connecting portion 525 may also be connected with the second traction wire 521 without being connected with the second spring 522, or connected with the second spring 522 without being connected with the second traction wire 521.

In fig. 6, the second traction wire 521 may be connected with the motor 531 via the fixing portion 524. And, the second spring 522 may be fixed with the guide rail 511 by the fixing portion 525. At this time, the second traction wire 521 may pass through a hole opened in the fixing portion 524 or be wound around the fixing portion 524.

Wherein the guide rail 523 may be grooved, the connecting portion 525 (slider) may have a first portion disposed inside the guide rail 523 and a second portion outside the guide rail 523, to which the second traction wire 521 and/or the second spring 522 may be connected, and to which one end of the first spring 512 is connected. The rail 523 may be fixed relative to the housing of the wireless charging device.

In fig. 6, a portion in which the first spring 512 and the first traction wire 511 are provided may be referred to as a guide rail 523, and in this case, the guide rail 511 has a circular arc shape. The fixing post 514 may be at the center of the arc.

The guide rail 511 shown in fig. 6 is a circular arc guide rail, and in this case, the moving region of the transmitting coil 420 may be fan-shaped.

It should be understood that the rail 523 may also be other shaped rails.

For example, the rail 523 may be a linear rail, and then, the moving area of the transmitting coil may be triangular at this time.

Alternatively, the rail 523 may be a square rail, in which case the moving area of the transmitting coil may be square.

Alternatively, the guide rail 523 may be a circular guide rail, and the fixing column 514 may be disposed within a circle enclosed by the circular guide rail, for example, at the center of the circle, and then, the moving area of the transmitting coil 420 may be circular.

Alternatively, the motor 531 in the embodiment of the present application may be a stepping motor.

Therefore, in the scheme shown in fig. 6, the motor 531 may pull one end of the first pulling wire 511, so that the first pulling wire 511 between the connecting portion 525 and the fixing portion 514 is shortened, thereby moving the transmitting coil 420 in a direction from the connecting portion 525 to the fixing portion 514, or the motor 531 may rotate in a reverse direction, so that the first pulling wire 511 between the connecting portion 525 and the fixing portion 514 is lengthened, thereby resetting the first spring 512, i.e., moving the transmitting coil 420 in a direction from the fixing portion 514 to the connecting portion 525.

And, the motor 531 can pull one end of the second traction wire 523, so that the second traction wire 521 in the guide rail 523 is shortened, one end of the first spring 512 can be driven to move along the guide rail 523 in the clockwise direction, so that the transmitting coil 420 can be driven to perform clockwise circular motion, the motor 531 can rotate in the reverse direction, so that the second traction wire 521 in the guide rail 523 is extended, and then the second spring 522 can be reset, so that the transmitting coil 420 can be driven to perform counterclockwise circular motion.

Alternatively, in the embodiment of the present application, the motor pulling the first traction wire 511 and the motor pulling the second traction wire 521 may be different motors, and at this time, the different motors may be operated alternately, that is, the transmitting coil 420 does not move between the end of the first traction wire (e.g., at the connecting portion 525) and the fixing portion 514 while the end of the first traction wire moves along the guide rail 523, or the end of the first traction wire does not move along the guide rail 523 while the transmitting coil 420 moves between the end of the first traction wire (e.g., at the connecting portion 525) and the fixing portion 514.

Alternatively, in the embodiment of the present application, the motor pulling the first traction wire 511 or the second traction wire 521 may be the same motor, and in this case, the wireless charging device may further include a switching portion, which may enable the motor to switch between driving the first traction wire and the second traction wire.

For example, as shown in fig. 6, the switching portion may include a first gear 541, a second gear 542, and a third gear 543, one end of the first drawing wire 511 is connected to the first gear 541, one end of the second drawing wire 521 is connected to the second gear 542, the motor 531 is provided with the third gear 543, and the third gear 543 may be engaged with the first gear 541 and the second gear 542, respectively.

Specifically, when it is necessary to extend or shorten the length of the first traction wire 511 between the connecting portion 525 and the fixing portion 514, the third gear 543 may be engaged with the first gear 541, and the third gear 543 may not be in contact with the second gear 542; and, when it is necessary to extend or shorten the length of the second traction wire 521 in the guide rail 523, the third gear 543 may be engaged with the second gear 542, and the third gear 543 may not be in contact with the first gear 541.

Here, a moving part (not shown) may be provided on the motor 531 for moving the third gear 343 so that the third gear 543 is engaged with the first gear 541 and the second gear 542, respectively.

Alternatively, a moving part (not shown) for moving the first gear 541 or the second gear 542 such that the first gear 541 or the second gear 542 meshes with the third gear 543 may be provided on the housing of the wireless charging device.

It should be understood that the switching part in the embodiment of the present application may also be in other implementation forms, and this is not specifically limited in the embodiment of the present application.

It should also be understood that the first and second tractors of the embodiments of the present application may have other implementations.

For example, the first spring 512 in fig. 6 may be replaced by other implementations, for example, the first spring 512 may be replaced by another pulling wire connected to another motor that may pull an end of the other pulling wire such that the length of the other pulling wire in the connecting portion 525 and the fixing portion 514 is shortened and the length of the first pulling wire 511 is lengthened, or the length of the other pulling wire in the connecting portion 525 and the fixing portion 514 is lengthened and the length of the first pulling wire 511 is shortened, so that the transmitting coil 420 may be driven to move between the connecting portion 525 and the fixing portion 514.

And, the second spring 522 in fig. 6 may be replaced by other implementations, for example, the second spring 522 may be replaced by another traction wire connected to another motor that may pull an end of the other traction wire such that a length of the other traction wire within the rail 523 is shortened and a length of the second traction wire 521 is lengthened, or such that a length of the other traction wire within the rail 523 is lengthened and a length of the second traction wire 521 is shortened, thereby moving an end of the first spring 512 along the rail 523.

Optionally, in the embodiment of the present application, as shown in fig. 7, the wireless charging device 400 may further include a control circuit 440, and the control circuit 440 may control the operation of the motor 531, so that the position of the transmitting coil 420 in the housing 410 may be adjusted. The control circuit 440 of the embodiment of the present application can be implemented by a Micro Control Unit (MCU), or can be implemented by the MCU and an Application Processor (AP) inside the device to be charged.

Since the charging efficiency of the device to be charged is related to the positional relationship of the transmitting coil and the receiving coil of the device to be charged. Thus, it is possible to determine the position of the receiving coil of the device to be charged and to adjust the position of the transmitting coil in the housing on the basis of the position of the receiving coil.

How the position of the receiving coil is determined will be described below in connection with several implementations.

In one implementation manner, the wireless charging apparatus 400 may further include an infrared thermal sensor, configured to acquire a heating characteristic of a device to be charged when the device to be charged is charged; the control circuit may determine the position of the receive coil based on the heating characteristic.

The collected heating characteristics can be embodied in the form of a heating cloud chart, which embodies the heating conditions of each part. The heating cloud may also be referred to as a thermal imaging cloud or a temperature cloud, etc.

The infrared heat sensing sensor may be fixed below the transmitting coil and maintained at a distance. The distance may be determined according to a surface area of the wireless charging apparatus on which the device to be charged is placed, so that the range of infrared heat induction may be ensured as much as possible, for example, as shown in fig. 8.

Optionally, the control circuit may determine the position of the receiving coil according to preset information and the heating characteristics acquired by the infrared thermal sensor, where the preset information includes the heating characteristics of each known part of the device to be charged in a specific charging stage and/or charging efficiency, and the heating characteristics acquired by the infrared thermal sensor are the heating characteristics in the specific charging stage and/or charging efficiency.

Specifically, a heating cloud chart of the device to be charged in each charging stage and/or charging efficiency may be collected, and the heating cloud chart may include information of a highest temperature point, a heating area, and the like, and a database may be established. The database information may be input into the wireless charging device, the positions of the devices to be charged corresponding to the respective portions of the cloud images are known, and the control circuit may determine the positions of the receiving coils by combining preset cloud images of the devices to be charged at a specific charging efficiency and/or a specific charging efficiency, and preset cloud images of the devices to be charged at a specific charging stage and/or a specific charging efficiency.

The control circuit determines the position of a specific heating feature corresponding to the equipment to be charged according to the preset information and the heating feature of the equipment to be charged; and determining the position of the receiving coil according to the position corresponding to the equipment to be charged with the specific heating characteristic.

That is, a specific heating feature in a heating cloud image of the device to be charged in a specific charging stage and/or charging efficiency, which is acquired by the infrared thermal sensor, is matched with a preset heating feature in the heating cloud image of the device to be charged in the specific charging stage and/or charging efficiency, and the position of the matched heating feature on the device to be charged is determined based on the preset heating cloud image.

The device to be charged for which the heating cloud picture in the preset information is directed and the device to be charged for which the receiving coil is determined in real time may be the same device to be charged or the same model device to be charged.

The following description will be made by taking the device to be charged as a mobile phone and by taking fig. 8 as an example.

First, modeling of a thermal imaging cloud image can be performed on the wireless charging state of the mobile phone 600, collecting a heating cloud image of the mobile phone 600 at each charging efficiency and/or charging stage of wireless charging, collecting information of heating characteristics of the mobile phone 600, such as a highest temperature point and a heating area, and establishing a database, and inputting the database into the wireless charging base 700.

Then, when the mobile phone 600 is placed in the wireless charging base 700, the receiving coil 610 of the mobile phone 600 and the transmitting coil 710 of the base 700 may be misaligned in the initial position, so that the charging efficiency is low, after the receiving coil 610 and the mobile phone 600 generate heat stably for a certain period of time, the infrared thermal sensor 800 may be turned on to detect, obtain a cloud chart of the mobile phone 600, compare the heat characteristics in the database, and obtain the position of a heat characteristic point on the base coordinates, because the receiving coil 610 on the mobile phone 600 is fixed relative to the position of the heat characteristic point, so that the coordinates of the center point of the receiving coil 610 of the mobile phone 600, that is, (x1, y1), may be calculated from the heat characteristic point.

Finally, a path for moving the transmitting coil 710 is determined according to the coordinates of the center point of the transmitting coil 710 (x0, y0) of the wireless charging dock 700 and the coordinates of the center point of the receiving coil 610 (x1, y1) of the cellular phone 600, thereby controlling the transmitting coil 710 to move to an optimal position and maximizing charging efficiency.

In one implementation, the wireless charging apparatus may further include a pressure sensor, configured to perform pressure sensing on a portion of the wireless charging apparatus carrying the device to be charged, and input a pressure sensing result to the control circuit; the control circuit may determine the area where the device to be charged is located according to the pressure sensing result, and determine the position of the receiving coil according to the area where the device to be charged is located.

The contact surface of the wireless charging device, which is in contact with a device to be charged, can be a resistance pressure sensing screen, the resistance pressure sensing screen is a sensor, the specific structure can be as shown in fig. 9, and is a structure of a thin film layer 901 and a glass layer 903, ITO (nano indium tin metal oxide) coatings 902 are coated on the adjacent surfaces of the thin film layer 901 and the glass layer 902, and the ITO has good conductivity and transparency. When an object (e.g., the mobile phone 900) is placed on the touch surface, the ITO on the lower layer of the thin film layer 901 on the touch surface contacts the ITO on the upper layer of the glass layer 903 (e.g., as shown in fig. 10), a corresponding electrical signal is transmitted through the sensor, and is transmitted to the control circuit through the conversion circuit, and is converted into coordinate values through calculation, so that a pressure sensing area is obtained.

It will be appreciated that the inductive screen shown in fig. 9 and 10 is schematic and that the inductive screen may have other parts in addition to the thin film layer, the glass layer and the ITO.

Alternatively, the control circuit 440 may determine at least one possible position of the receiving coil according to the area where the device to be charged is located; the transmitting coils are adjusted to be respectively aligned with the at least one position, and the position of the receiving coil is determined according to the charging efficiency of the device to be charged at each of the at least one position. Wherein a location of the at least one location where the charging efficiency is highest may be determined as the location of the receiving coil. The calculation formula of the charging efficiency is as follows: and eta is Pout/Pin, wherein Pout is the power of the equipment to be charged, and Pin is the power output by the transmitting coil.

Specifically, when the device to be charged is placed on the wireless charging device, the control circuit may scan along the X axis whether there is a pressure change on the abscissa, extract an X coordinate of the pressure change, then scan along the Y axis whether there is a pressure change on the ordinate, extract a Y coordinate of the pressure change, and thus synthesize a pressure change plane, so that the placement position of the device to be charged may be determined, and the coordinate of the central point of the device to be charged is defined as (Xt, Yt). The position of the receiving coil can be further positioned, because the resistance pressure sensing screen cannot distinguish the orientation of the device to be charged, the position can be found by adopting an elimination method, because the receiving coil is fixed relative to the device to be charged, taking a mobile phone as an example, the position of the receiving coil on the mobile phone is symmetrical left and right, only is on the upper side or on the lower side, that is, the coordinates of the receiving coil relative to the wireless charging device should be (Xt + L, Yt) or (Xt-L, Yt), the L value is the value of the receiving coil on the mobile phone relative to the central point of the mobile phone, the wireless charging efficiency when the central point coordinates of the receiving coil move to the (Xt + L, Yt) position and the (Xt-L, Yt) position is respectively compared and calculated, and the correct position is the position with higher charging efficiency.

If the charging efficiency of the adjusted last possible position is the highest, the last position is determined to be the position of the receiving coil, and at the moment, the alignment of the receiving coil and the transmitting coil is achieved, namely, the position of the transmitting coil does not need to be adjusted.

Two ways of determining the position of the receiving coil of the device to be charged have been described above, but the embodiments of the present application are not limited thereto.

After determining the position of the receive coil, the control circuitry may adjust the position of the transmit coil in the housing based on the position of the receive coil. Wherein, the position of the transmitting coil may be adjusted by moving the transmitting coil away from the receiving coil (for example, when the user wants to slow charge the battery of the device to be charged), or by moving the transmitting coil close to or towards the receiving coil (for example, when the user wants to fast charge the battery of the device to be charged), and specifically, the position of the transmitting coil may be adjusted by using the adjusting mechanism 500 shown in fig. 6.

For example, as shown in fig. 11, the center coordinates of the receiving coil 610 of the cellular phone 600 are determined to be (x1, y1) and the center coordinates of the transmitting coil 710 of the wireless charging dock 700 are determined to be (x0, y0), then the transmitting coil 710 may be adjusted such that the center coordinates of the transmitting coil 710 are moved from (x0, y0) to (x1, y 1).

The adjustment of the position of the transmit coil 400 based on the position of the receive coil has been described above. The present embodiment can also control the movement of the motor 531 in conjunction with the received power or charging efficiency of the device to be charged to adjust the position of the transmitting coil 420 in the housing 410.

As shown in fig. 7, the wireless charging device 400 may have a communication circuit 450 in addition to the housing 410 (not shown), the transmitting coil 420, the adjustment mechanism 430, and the control circuit 440. The wireless charging apparatus 400 may wirelessly communicate with the device to be charged through the communication circuit 450 to obtain the current received power of the device to be charged.

The specific structure of the device to be charged may be as shown in fig. 3 and 4, and for brevity, will not be described again here.

In one implementation, control circuit 440 may adjust the position of transmit coil 420 within housing 410 in anticipation of the desired receive power of the device to be charged based on the current receive power of the device to be charged and the desired receive power of the device to be charged.

Wherein the received power expected by the device to be charged can be transmitted to the wireless charging apparatus 400 by the device to be charged. Assuming that the device to be charged is a terminal, the user may set desired reception power on the terminal through a user interface and transmit the reception power to the wireless charging apparatus 400.

For example, if the device to be charged wishes to slow down the battery, the control circuit 440 may control the adjustment mechanism 430 to adjust the position of the transmitting coil 420 to reduce the power of the receiving coil. Alternatively, the expected received power of the device to be charged may be greater than the current received power, for example, assuming that the device to be charged wishes to charge the battery 430 quickly, the control circuit 440 may control the adjustment mechanism 430 to adjust the position of the transmitting coil 420 to increase the power of the receiving coil 410.

That is, the adjustment mechanism 430 may adjust the position of the transmit coil 420 such that the transmit coil 420 is farther away from the receive coil or closer to the receive coil. Wherein the position of the receiving coil may be known to the control circuit 440, e.g. may be obtained by a pressure sensor or an infrared sensor.

In one implementation, the control circuit 440 may determine a current charging efficiency value based on the received power of the device to be charged and the transmit power of the transmit coil 420, and adjust the position of the transmit coil 420 within the housing 410 based on the current charging efficiency value.

Specifically, the control circuit 440 may stop the adjustment when adjusting the position of the transmitter coil 420 within the housing 410 based on the current charging efficiency value, when adjusting to a particular charging efficiency value, and/or when adjusting the value of the change in the charging efficiency value is less than the error.

The specific charging efficiency value may be a maximum achievable charging efficiency value (i.e., a charging efficiency value when the transmitting coil and the receiving coil coincide with each other), or a charging efficiency value expected by the device to be charged.

Wherein the desired charging efficiency value of the device to be charged may be transmitted to the wireless charging apparatus 400 by the device to be charged. Assuming that the device to be charged is a terminal, the user may set a desired charging efficiency value on the terminal through a user interface and transmit the charging efficiency value to the wireless charging apparatus 400.

For example, if the device to be charged wishes to slow down the battery, the control circuit 440 may control the adjustment mechanism 430 to adjust the position of the transmitting coil 420 to reduce the charging efficiency. Alternatively, the desired charging efficiency value of the device to be charged may be greater than the current charging efficiency value, for example, if the device to be charged wishes to charge the battery quickly, the control circuit 440 may control the adjustment mechanism 430 to adjust the position of the transmitting coil 420 to increase the charging efficiency value.

Alternatively, in the embodiment of the present application, the position of the receiving coil may also be unknown to the control circuit 440, and then, by attempting to move the transmitting coil 420, the receiving power or charging efficiency value of the device to be charged may satisfy the predetermined condition.

Specifically, the control circuit 440 may control the movement of the motor to adjust the position of the transmitting coil 420 in the housing 410 according to a change in the receiving power of the device to be charged or a charging efficiency value during the movement of the transmitting coil 420.

For ease of understanding, the following description will be given taking as an example the case where the maximum charging efficiency is desired.

In one implementation, the motor drives the second pulling member such that one end of the first pulling member moves along the guide rail in a first direction,

if the charging efficiency value is increased, the motor continues to drive the second pulling mechanism, so that one end of the first pulling mechanism moves along the guide rail according to the first direction until the progressive value of the charging efficiency value is less than or equal to the first value, or,

if the charging efficiency value is reduced, the motor continues to drive the second traction device, so that one end of the first traction device moves along the guide rail in a second direction opposite to the first direction, and if the charging efficiency value is increased, the motor continues to move until the progressive value of the charging efficiency value is smaller than or equal to the first value.

Optionally, the first value is a minimum step efficiency value when the one end of the first pulling rod moves along the guiding rail.

And under the condition that the motor drives the second traction device to enable one end of the first traction device to move along the guide rail, if the progressive value of the charging efficiency value is smaller than or equal to the first value and the charging efficiency value does not reach the maximum charging efficiency value, the motor drives the first traction device to enable the transmitting coil to move between one end of the first traction device and the fixing part.

The following description will be made in conjunction with the adjustment mechanism 500 shown in fig. 6 and fig. 11. As shown in fig. 11, the coordinates of the center of the transmitting coil 420 are assumed to be (X0, Y0), and the coordinates of the receiving coil 610 of the handset 600 are (X1, Y1). Wherein the control circuit may preset a maximum efficiency value η max, which may be a maximum efficiency value defined during the test.

When the mobile phone is initially placed on the wireless charging base, the mobile phone can still be charged wirelessly, only the efficiency is low, the wireless charging base can acquire the power value received by the mobile phone end through the communication between the mobile phone and the wireless charging base, then the control circuit can calculate the current wireless charging efficiency eta 0, when the eta 0 is less than eta max, the charging efficiency is low, the transmitting coil needs to be adjusted, otherwise, the transmitting coil does not need to be moved; the following will describe how the movement of the transmitting coil is performed when it is necessary to move the transmitting coil.

Firstly: meshing the third gear 543 with the second gear 542, controlling the step motor 531 to operate at an angle Δ θ, extending (or shortening) the length Δ l of the second traction wire 521, and rotating the transmitting coil 420 along the circumference, at this time, calculating an efficiency value η 1 at the position, if η 1> η 0, indicating that the operating direction of the transmitting coil 420 is correct, and continuing to adjust along the direction; if eta 1 is less than eta 0, the running direction of the transmitting coil is opposite, and the transmitting coil needs to be adjusted in the opposite direction; until the difference between eta t and eta t-1 is adjusted to be less than the minimum stepping efficiency value, the position is proper and no adjustment is needed.

Then, the third gear 543 is meshed with the first gear 541, the step motor is controlled to operate at an angle Δ θ, the first drawing wire 511 is lengthened (or shortened) by Δ l, the transmitting coil moves in front of the connecting portion 525 and the fixing portion 514, the efficiency value η 1 at the position is calculated, if η 1> η 0, the operating direction of the transmitting coil 420 is correct, and the adjustment along the direction can be continued; if η 1< η 0, it indicates that the operation direction of the transmitting coil 420 is opposite, and it needs to be adjusted in the opposite direction; until the difference between eta t and eta t-1 is less than the minimum stepping efficiency value, the position is at the maximum efficiency position, and the coil is aligned.

The above describes that the motor may be driven to drive the second pulling device first, so that one end of the first pulling device moves along the guide rail, and if the charging efficiency value does not reach the expected value, the motor may be driven continuously to drive the first pulling device, so that the transmitting coil moves between one end of the first pulling device and the fixing portion.

However, it should be understood that the embodiment of the present application is not limited thereto, and the motor may be driven to drive the first pulling device such that the transmitting coil moves between the end of the first pulling device and the fixing portion, and if the charging efficiency value does not meet the desired value, the motor drives the second pulling device such that the end of the first pulling device moves along the guide rail.

Specifically, the motor drives the first pulling mechanism, so that the transmitting coil moves in the third direction between one end of the first pulling mechanism and the fixed portion, if the charging efficiency value increases, the motor continues to drive the first pulling mechanism, so that the transmitting coil moves in the third direction between one end of the first pulling mechanism and the fixed portion until the progressive value of the charging efficiency value is less than or equal to the second value, or, if the charging efficiency value decreases, the motor continues to drive the first pulling mechanism, so that the transmitting coil moves in the fourth direction opposite to the third direction between one end of the first pulling mechanism and the fixed portion, if the charging efficiency value increases, the motor continues to move until the progressive value of the charging efficiency value is less than or equal to the second value.

Optionally, the second value is a minimum stepping efficiency value when the transmitting coil moves between the one end of the first pulling body and the fixed portion.

Optionally, under the condition that the motor drives the first pulling device to move the transmitting coil between the one end of the first pulling device and the fixing portion, if the progressive value of the charging efficiency value is smaller than or equal to the second value and the charging efficiency value does not reach the maximum charging efficiency value, the motor drives the second pulling device to move the one end of the first pulling device along the guide rail.

Therefore, in the embodiment of the present application, by comparing the change in charging efficiency values during the movement of the transmitting coil, the alignment of the transmitting coil and the receiving coil can be achieved.

Various parts of the wireless charging device are described above, but it should be understood that the embodiments of the present application are not limited thereto.

For example, the above wireless charging device 400 may include a structure like the wireless charging device 200 in fig. 2, and for brevity, the description is omitted here.

It should be understood that the manner in which the transmit coil is adjusted (e.g., based on infrared, pressure, or efficiency) as described in embodiments herein may be used in the configurations shown in fig. 1-7, or may be used in other configurations or combinations of wireless charging devices independent of the configurations of fig. 1-7.

Fig. 12 is a schematic flow chart diagram of a wireless charging method 1000 according to an embodiment of the application. As shown in fig. 12, the method 1000 includes:

in 1010, a wireless electromagnetic signal is transmitted by a transmitting coil disposed within a housing of a wireless charging apparatus for wirelessly charging a device to be charged, which is disposed with a receiving coil.

At 1020, movement of the motor is controlled to move the first and/or second pulling device such that the transmitting coil moves between an end of the first pulling device and a fixed portion fixed relative to the housing and/or such that the end of the first pulling device moves along a guide track,

one end of the first traction device is arranged at the guide rail and connected with the second traction object, the other end of the first traction device is connected with the motor through the fixing part, and the transmitting coil is arranged on the first traction device.

Optionally, in an embodiment of the present application, controlling the motion of the motor includes:

determining a position of the receive coil;

based on the position of the receive coil, the motion of the motor is controlled.

Optionally, in an embodiment of the present application, the determining the position of the receiving coil includes:

when the equipment to be charged is charged, acquiring the heating characteristic of the equipment to be charged;

and determining the position of the receiving coil according to the heating characteristic.

Optionally, in an embodiment of the present application, determining the position of the receiving coil includes:

the position of the receiving coil is determined according to preset information and the heating characteristics of the device to be charged, the preset information represents the heating characteristics of each known part of the device to be charged in a specific charging stage and/or charging efficiency, and the heating characteristics acquired by the infrared thermal sensor are the heating characteristics in the specific charging stage and/or charging efficiency.

determining the position of the specific heating feature corresponding to the equipment to be charged according to the preset information and the heating feature acquired by the infrared thermal sensor;

and determining the position of the receiving coil according to the position corresponding to the specific heating characteristic of the equipment to be charged.

carrying out pressure induction on a part of the wireless charging method, which bears the equipment to be charged, so as to obtain a pressure induction result;

and determining the area of the equipment to be charged according to the pressure induction result, and determining the position of the receiving coil according to the area of the equipment to be charged.

determining at least one possible position of the receiving coil according to the area of the device to be charged;

adjusting the transmitting coils to be respectively aligned with the at least one position;

and determining the position of the receiving coil according to the charging efficiency of the device to be charged at each position of the at least one position.

and determining the position with the highest charging efficiency in the at least one position as the position of the receiving coil.

and controlling the motor to move according to the change of the receiving power or the change of the charging efficiency of the device to be charged in the process of moving the transmitting coil so as to adjust the position of the transmitting coil in the shell.

Optionally, in an embodiment of the present application, the method 1000 further includes:

and communicating with the equipment to be charged to obtain the received power.

calculating a charging efficiency value based on the received power and the transmitting power of the transmitting coil;

controlling a motion of the motor based on the change in the charging efficiency value.

controlling the motor to drive the second pulling member to move one end of the first pulling member along the guide rail in a first direction,

if the charging efficiency value is increased, controlling the motor to continue to drive the second pulling mechanism, so that one end of the first pulling mechanism moves along the guide rail according to the first direction until the progressive value of the charging efficiency value is less than or equal to the first value, or,

if the charging efficiency value is reduced, the motor is controlled to continue to drive the second traction device, so that one end of the first traction device moves along the guide rail in a second direction opposite to the first direction, and if the charging efficiency value is increased, the movement is continued until the progressive value of the charging efficiency value is smaller than or equal to the first value.

Optionally, in this embodiment, the first value is a minimum step efficiency value when the one end of the first pulling device moves along the guiding rail.

Optionally, in an embodiment of the present application, controlling the motion of the motor further includes:

and under the condition that the motor is controlled to drive the second traction device, so that one end of the first traction device moves along the guide rail, if the progressive value of the charging efficiency value is less than or equal to the first value and the charging efficiency value does not reach the maximum charging efficiency value, the motor is controlled to drive the first traction device, so that the transmitting coil moves between one end of the first traction device and the fixing part.

controlling the motor to drive the first pulling rod to make the transmitting coil move between one end of the first pulling rod and the fixed part according to a third direction,

if the charging efficiency value is increased, controlling the motor to continue to drive the first pulling mechanism, so that the transmitting coil moves between one end of the first pulling mechanism and the fixed part according to the third direction until the progressive value of the charging efficiency value is less than or equal to a second value, or,

if the charging efficiency value is decreased, the motor is controlled to continue to drive the first traction device, so that the transmitting coil moves between one end of the first traction device and the fixed part in a fourth direction opposite to the third direction, and if the charging efficiency value is increased, the transmitting coil continues to move until the progressive value of the charging efficiency value is smaller than or equal to the second value.

Optionally, in an embodiment of the present application, the second value is a minimum stepping efficiency value when the transmitting coil moves between the end of the first pulling rod and the fixing portion.

Optionally, in an embodiment of the present application, the controlling the motion of the motor further includes:

under the condition that the motor drives the first traction device to enable the transmitting coil to move between one end of the first traction device and the fixing portion, if the progressive value of the charging efficiency value is smaller than or equal to the second value and the charging efficiency value does not reach the maximum charging efficiency value, the motor is controlled to drive the second traction device to enable one end of the first traction device to move along the guide rail.

Optionally, in an embodiment of the present application, the first pull object comprises a first pull wire and a first spring;

one end of the first traction wire is connected with one end of the first spring, the other end of the first spring is formed into one end of the first traction object to be connected with the second traction object, and the other end of the first traction wire is formed into the other end of the first traction object to be connected with the motor;

the transmitting coil is connected with the first spring or the first traction wire.

Optionally, in an embodiment of the present application, the second pull object comprises a second pull wire and a second spring;

in the guide rail, one end of the second traction wire is connected with one end of the second spring, the other end of the second traction wire penetrates through the guide rail and is connected with the motor, and the other end of the second spring is fixed relative to the guide rail.

and controlling a switching part to switch the motor between driving the first traction wire and the second traction wire.

Optionally, in an embodiment of the present application, the switching portion includes a first gear, a second gear, and a third gear, one end of the first traction wire is connected to the first gear, one end of the second traction wire is connected to the second gear, and the motor is provided with the third gear, and the third gear is engaged with the first gear and the second gear, respectively.

It should be understood that the wireless charging method can be implemented by the

wireless charging apparatus

200 or 400 described above, and therefore, for brevity, the description is omitted here.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

A wireless charging device, comprising:

a housing;

the transmitting coil is arranged in the shell and used for transmitting a wireless electromagnetic signal so as to wirelessly charge the equipment to be charged, which is provided with the receiving coil;

an adjusting mechanism for adjusting the position of the transmitting coil in the housing, wherein the adjusting mechanism comprises a guide rail, a first tractor, a second tractor and at least one motor,

wherein one end of the first pulling piece is arranged at the guide rail and is connected with the second pulling piece, the other end of the first pulling piece is connected with the motor through a fixing part fixed relative to the shell, the transmitting coil is arranged on the first pulling piece,

the motor drives the second traction device to enable one end of the first traction device to move along the guide rail,

the motor drives the first pulling piece, so that the transmitting coil moves between one end of the first pulling piece and the fixing part.
The wireless charging device of claim 1, wherein the first pull object comprises a first pull wire and a first spring;

one end of the first traction wire is connected with one end of the first spring, the other end of the first spring is formed that one end of the first traction object is connected with the second traction object, and the other end of the first traction wire is formed that the other end of the first traction object is connected with the motor;

the transmitting coil is connected with the first spring or the first pull wire.
The wireless charging device of claim 2, wherein the second pull object comprises a second pull wire and a second spring;

in the guide rail, one end of the second traction wire is connected with one end of the second spring, the other end of the second traction wire penetrates through the guide rail and is connected with the motor, and the other end of the second spring is fixed relative to the guide rail.
The wireless charging apparatus of claim 3, wherein the adjustment mechanism further comprises a switching portion;

the switching part is used for enabling the motor to switch between driving the first traction wire and the second traction wire.
The wireless charging device according to claim 4, wherein the switching portion comprises a first gear, a second gear and a third gear, one end of the first pulling wire is connected with the first gear, one end of the second pulling wire is connected with the second gear, and the motor is provided with the third gear, and the third gear can be meshed with the first gear and the second gear respectively.
The wireless charging device according to any one of claims 1 to 5, wherein a slider is provided at one end of the first pulling member, and the one end of the first pulling member is connected to the second pulling member via the slider.
The wireless charging device according to any one of claims 1 to 6, wherein the guide rail is a circular arc guide rail or a circular guide rail, and the fixing portion is provided at a center of a circular arc or a circle.
The wireless charging device of any one of claims 1 to 7, further comprising:

a control circuit to determine a position of the receive coil and to control movement of the motor based on the position of the receive coil.
The wireless charging apparatus of claim 8, further comprising:

the infrared thermal sensor is used for acquiring the heating characteristics of the equipment to be charged when the equipment to be charged is charged;

the control circuit is further configured to: and determining the position of the receiving coil according to the heating characteristic.
The wireless charging apparatus of claim 9, wherein the control circuit is specifically configured to:

the position of the receiving coil is determined according to preset information and heating characteristics acquired by the infrared thermal sensor, the preset information represents the heating characteristics of all known parts of the equipment to be charged in a specific charging stage and/or charging efficiency, and the heating characteristics acquired by the infrared thermal sensor are the heating characteristics in the specific charging stage and/or charging efficiency.
The wireless charging apparatus of claim 10, wherein the control circuit is further configured to:

determining the position of a specific heating feature corresponding to the equipment to be charged according to the preset information and the heating feature acquired by the infrared thermal sensor;

and determining the position of the receiving coil according to the position corresponding to the equipment to be charged with the specific heating characteristic.
The wireless charging apparatus of claim 8, further comprising:

the pressure sensor is used for carrying out pressure induction on the part of the wireless charging device, which bears the equipment to be charged, and inputting a pressure induction result to the control circuit;

wherein the control circuit is specifically configured to: and determining the area of the equipment to be charged according to the pressure induction result, and determining the position of the receiving coil according to the area of the equipment to be charged.
The wireless charging apparatus of claim 12, wherein the control circuit is specifically configured to:

determining at least one possible position of the receiving coil according to the area of the device to be charged;

adjusting the transmitting coils to be respectively aligned with the at least one position;

determining the position of the receiving coil according to the charging efficiency of the device to be charged at each position of the at least one position.
The wireless charging apparatus of claim 13, wherein the determining the position of the receiving coil according to the charging efficiency of the device to be charged at each of the at least one position comprises:

determining a location of the at least one location where charging efficiency is highest as the location of the receive coil.
The wireless charging device according to any one of claims 12 to 14, wherein the pressure sensing portion is a resistive pressure sensor.
The wireless charging apparatus of claim 8, further comprising:

and the control circuit is used for controlling the motion of the motor according to the change of the receiving power or the change of the charging efficiency of the equipment to be charged in the process of moving the transmitting coil so as to adjust the position of the transmitting coil in the shell.
The wireless charging apparatus of claim 16, wherein the apparatus further comprises:

a communication circuit, configured to communicate with the device to be charged to obtain the received power.
The wireless charging apparatus of claim 16 or 17, wherein the control circuit is further configured to:

calculating a charging efficiency value based on the received power and the transmission power of the transmission coil;

controlling a motion of the motor based on the change in the charging efficiency value.
The wireless charging apparatus of any of claims 16-18, wherein the motor drives the second pulling member such that an end of the first pulling member moves along the guide rail in a first direction,

if the charging efficiency value is increased, the motor continues to drive the second pulling mechanism, so that one end of the first pulling mechanism moves along the guide rail according to the first direction until the progressive value of the charging efficiency value is less than or equal to the first value, or,

if the charging efficiency value is decreased, the motor continues to drive the second pulling mechanism, so that one end of the first pulling mechanism moves along the guide rail in a second direction opposite to the first direction, and if the charging efficiency value is increased, the movement is continued until the progressive value of the charging efficiency value is smaller than or equal to the first value.
The wireless charging apparatus of claim 19, wherein the first value is a minimum step efficiency value when an end of the first pulling object moves along the guide rail.
The wireless charging device of claim 19 or 20, wherein the motor drives the second pulling device such that if the charging efficiency value is less than or equal to the first value and the charging efficiency value does not reach the maximum charging efficiency value while the end of the first pulling device moves along the guide rail, the motor drives the first pulling device such that the transmitting coil moves between the end of the first pulling device and the fixing portion.
The wireless charging apparatus according to any one of claims 16 to 18, wherein the motor drives the first pulling member such that the transmitting coil moves in a third direction between one end of the first pulling member and the fixed portion,

if the charging efficiency value is increased, the motor continues to drive the first pulling rod, so that the transmitting coil moves between one end of the first pulling rod and the fixed part according to the third direction until the progressive value of the charging efficiency value is smaller than or equal to a second value, or,

if the charging efficiency value is decreased, the motor continues to drive the first pulling mechanism, so that the transmitting coil moves between one end of the first pulling mechanism and the fixed part in a fourth direction opposite to the third direction, and if the charging efficiency value is increased, the transmitting coil continues to move until the progressive value of the charging efficiency value is smaller than or equal to the second value.
The wireless charging apparatus of claim 22, wherein the second value is a minimum step efficiency value of the transmit coil moving between the one end of the first pulling object and the fixed portion.
The wireless charging device of claim 22 or 23, wherein when the motor drives the first pulling device such that the transmitting coil moves between the end of the first pulling device and the fixed portion, if the charging efficiency value is less than or equal to the second value in a progressive manner and the charging efficiency value does not reach a maximum charging efficiency value, the motor drives the second pulling device such that the end of the first pulling device moves along the guide rail.
The wireless charging device of any one of claims 1 to 24, wherein the wireless charging device is a wireless charging cradle.
The wireless charging apparatus of any one of claims 1 to 25, wherein the apparatus to be charged is a terminal.
A wireless charging system, characterized by comprising the wireless charging apparatus according to any one of claims 1 to 26, and a device to be charged that is charged by the wireless charging apparatus.
A wireless charging method, comprising:

transmitting a wireless electromagnetic signal by using a transmitting coil arranged in a shell of the wireless charging device so as to be used for wirelessly charging the equipment to be charged with a receiving coil;

controlling the movement of the motor to drive the first pulling device and/or the second pulling device, so that the transmitting coil moves between one end of the first pulling device and a fixed part fixed relative to the shell, and/or one end of the first pulling device moves along a guide rail,

one end of the first traction device is arranged at the guide rail and connected with the second traction object, the other end of the first traction device is connected with the motor through the fixing part, and the transmitting coil is arranged on the first traction device.
The wireless charging method of claim 28, wherein controlling the movement of the motor comprises:

determining a position of the receive coil;

controlling movement of the motor based on the position of the receive coil.
The wireless charging method of claim 29, wherein the determining the location of the receive coil comprises:

when the equipment to be charged is charged, acquiring the heating characteristics of the equipment to be charged;

and determining the position of the receiving coil according to the heating characteristic.
The wireless charging method of claim 30, wherein the determining the location of the receive coil comprises:

the position of the receiving coil is determined according to preset information and the heating characteristics of the device to be charged, the preset information represents the heating characteristics of all known parts of the device to be charged in a specific charging stage and/or charging efficiency, and the heating characteristics acquired by the infrared thermal sensor are the heating characteristics in the specific charging stage and/or charging efficiency.
The wireless charging method of claim 31, wherein the determining the position of the receiving coil comprises:

determining the position of a specific heating feature corresponding to the equipment to be charged according to the preset information and the heating feature acquired by the infrared thermal sensor;

and determining the position of the receiving coil according to the position corresponding to the equipment to be charged with the specific heating characteristic.
The wireless charging method of claim 29, wherein the determining the location of the receive coil comprises:

carrying out pressure induction on the part of the wireless charging device, which bears the equipment to be charged, so as to obtain a pressure induction result;

and determining the area of the equipment to be charged according to the pressure induction result, and determining the position of the receiving coil according to the area of the equipment to be charged.
The wireless charging method of claim 33, wherein the determining the location of the receive coil comprises:

determining at least one possible position of the receiving coil according to the area of the device to be charged;

adjusting the transmitting coils to be respectively aligned with the at least one position;

determining the position of the receiving coil according to the charging efficiency of the device to be charged at each position of the at least one position.
The wireless charging method of claim 34, wherein the determining the location of the receive coil comprises:

determining a location of the at least one location where charging efficiency is highest as the location of the receive coil.
The wireless charging method of claim 28, wherein controlling the movement of the motor comprises:

and controlling the motion of the motor according to the change of the receiving power or the change of the charging efficiency of the device to be charged in the process of moving the transmitting coil so as to adjust the position of the transmitting coil in the shell.
The wireless charging method of claim 36, further comprising:

communicating with the device to be charged to obtain the received power.
The wireless charging method of claim 36 or 37, wherein the controlling the movement of the motor comprises:

calculating a charging efficiency value based on the received power and the transmission power of the transmission coil;

controlling a motion of the motor based on the change in the charging efficiency value.
The wireless charging method of any one of claims 36 to 38, wherein the controlling the movement of the motor comprises:

controlling the motor to drive the second pulling rod to enable one end of the first pulling rod to move along the guide rail in a first direction,

if the charging efficiency value is increased, controlling the motor to continue to drive the second traction device, so that one end of the first traction device moves along the guide rail according to the first direction until the progressive value of the charging efficiency value is less than or equal to the first value, or,

and if the charging efficiency value is reduced, controlling the motor to continuously drive the second traction device, so that one end of the first traction device moves along the guide rail in a second direction opposite to the first direction, and if the charging efficiency value is increased, continuously moving until the progressive value of the charging efficiency value is smaller than or equal to the first value.
The wireless charging method of claim 39, wherein the first value is a minimum step efficiency value when an end of the first pulling object moves along the guide rail.
The wireless charging method of claim 39 or 40, wherein the controlling the movement of the motor further comprises:

and under the condition that the motor is controlled to drive the second traction mechanism, so that one end of the first traction mechanism moves along the guide rail, if the progressive value of the charging efficiency value is smaller than or equal to the first value and the charging efficiency value does not reach the maximum charging efficiency value, the motor is controlled to drive the first traction mechanism, so that the transmitting coil moves between one end of the first traction mechanism and the fixed part.
The wireless charging method of any one of claims 36 to 38, wherein the controlling the movement of the motor comprises:

controlling the motor to drive the first pulling piece to enable the transmitting coil to move between one end of the first pulling piece and the fixed part according to a third direction,

if the charging efficiency value is increased, controlling the motor to continue to drive the first pulling mechanism, so that the transmitting coil moves between one end of the first pulling mechanism and the fixed part according to the third direction until the progressive value of the charging efficiency value is smaller than or equal to a second value, or,

and if the charging efficiency value is reduced, controlling the motor to continue to drive the first traction device, so that the transmitting coil moves between one end of the first traction device and the fixed part in a fourth direction opposite to the third direction, and if the charging efficiency value is increased, continuing to move until the progressive value of the charging efficiency value is smaller than or equal to the second value.
The wireless charging method of claim 42, wherein the second value is a minimum step efficiency value when the transmitting coil moves between the end of the first pulling object and the fixed portion.
The wireless charging method of claim 42 or 43, wherein controlling the movement of the motor further comprises:

and under the condition that the motor drives the first traction device to enable the transmitting coil to move between one end of the first traction device and the fixed part, if the progressive value of the charging efficiency value is smaller than or equal to the second value and the charging efficiency value does not reach the maximum charging efficiency value, controlling the motor to drive the second traction device to enable one end of the first traction device to move along the guide rail.
The wireless charging method of any one of claims 28 to 44, wherein the first pull object comprises a first pull wire and a first spring;

one end of the first traction wire is connected with one end of the first spring, the other end of the first spring is formed that one end of the first traction object is connected with the second traction object, and the other end of the first traction wire is formed that the other end of the first traction object is connected with the motor;

the transmitting coil is connected with the first spring or the first pull wire.
The wireless charging method of claim 45, wherein the second pull object comprises a second pull wire and a second spring;

in the guide rail, one end of the second traction wire is connected with one end of the second spring, the other end of the second traction wire penetrates through the guide rail and is connected with the motor, and the other end of the second spring is fixed relative to the guide rail.
The wireless charging method of claim 46, further comprising:

and controlling a switching part to switch the motor between driving the first traction wire and the second traction wire.
The wireless charging method as claimed in claim 47, wherein the switching part includes a first gear, a second gear and a third gear, one end of the first traction wire is connected to the first gear, one end of the second traction wire is connected to the second gear, and the motor is provided with a third gear, and the third gear is engaged with the first gear and the second gear, respectively.