CN103236567B - Wireless charging method, device and system - Google Patents

Abstract

The present invention discloses a method, device and system for wireless charging, which relates to the field of electronic equipment applications and can solve the problem of reduced coupling during wireless charging. The method of the present invention comprises: obtaining coupling characteristic information of the opposite end, wherein the coupling characteristic information is used to characterize the coupling degree of electromagnetic wave signals sent and received between the local end and the opposite end; determining the local frequency according to the coupling characteristic information so that the local frequency and the opposite frequency are optimally matched. The present invention is mainly used in the process of wireless charging of electronic devices such as mobile phones and computers.

Description

Method, device and system for wireless charging

technical field

The present invention relates to the application field of electronic equipment, in particular to a wireless charging method, device and system.

Background technique

Wireless charging technology mainly transmits electric energy through electromagnetic waves. A typical wireless charging system includes a transmitting end for sending electromagnetic waves (such as a charging base) and a receiving end for receiving electromagnetic waves (such as a device to be charged). The transmitting end and the receiving end transmit and receive electromagnetic waves through electromagnetic induction or magnetic field resonance, thereby realizing the transfer of electric energy. With the increasing maturity of wireless charging technology and the continuous expansion of its application scope, wireless charging technology has attracted more and more attention from electronic equipment manufacturers, and has received great attention in the fields of mobile phone charging, electric vehicles, medical electronic equipment implantation, etc. .

The principle of wireless charging technology to generate electromagnetic waves is that an oscillating circuit such as an LC loop is installed inside the transmitter, and the magnetic field energy in the inductance in the oscillating circuit and the electric field energy in the capacitor are converted to each other to generate an oscillating current, thereby generating a high-frequency characteristic. electromagnetic waves. The receiving end receives the electromagnetic wave through the receiving frequency that best matches the frequency of the electromagnetic wave (also called the transmitting frequency of the transmitting end).

In the process of realizing the above wireless charging, the inventor found at least the following problems in the prior art: usually, the transmitting frequency of the transmitting end and the receiving frequency of the receiving end are both fixed values. As the use time of electronic equipment increases, some components in the electronic equipment age, and the frequency of the transmitting end and the receiving end will change, resulting in a decrease in the degree of coupling, thereby reducing the charging efficiency. In addition, the reduction of the coupling degree will also lead to an increase in electromagnetic radiation and heat generation, which will further accelerate the aging of electronic equipment and components, affect the life of the product, and even lead to fire accidents in severe cases.

Contents of the invention

Embodiments of the present invention provide a wireless charging method, device and system, which can solve the problem of reduced coupling degree during wireless charging.

In the first aspect, an embodiment of the present invention provides a wireless charging method, including:

Acquiring coupling feature information of the opposite end, where the coupling feature information is used to characterize the coupling degree of the electromagnetic wave signals sent and received between the local end and the opposite end;

The frequency of the local end is determined according to the coupling characteristic information, so that the frequency of the local end and the frequency of the opposite end can be optimally matched.

In the second aspect, an embodiment of the present invention provides a wireless charging device, including:

An acquisition unit, configured to acquire coupling characteristic information of the opposite end, where the coupling characteristic information is used to characterize the coupling degree of electromagnetic wave signals sent and received between the local end and the opposite end;

The determining unit is configured to determine the frequency of the local terminal according to the coupling feature information obtained by the obtaining unit, so that the frequency of the local terminal can best match the frequency of the opposite terminal.

In the third aspect, the embodiment of the present invention provides a wireless charging system, including a transmitting end and a receiving end, and the transmitting end includes the wireless charging device as described in the second aspect, wherein,

The receiving end is configured to send coupling characteristic information to the transmitting end, and the coupling characteristic information is used to characterize the coupling degree of transmitting and receiving electromagnetic wave signals between the receiving end and the transmitting end;

The transmitting end is configured to obtain the coupling characteristic information sent by the receiving end, and determine the transmitting frequency of the transmitting end according to the coupling characteristic information, so that the transmitting frequency of the transmitting end is equal to the receiving frequency of the receiving end best match.

In a fourth aspect, an embodiment of the present invention provides a wireless charging system, including a transmitting end and a receiving end, and the receiving end includes the wireless charging device as described in the second aspect, wherein,

The transmitting end is configured to send coupling characteristic information to the receiving end, and the coupling characteristic information is used to represent the coupling degree of transmitting and receiving electromagnetic wave signals between the transmitting end and the receiving end;

The receiving end is configured to acquire the coupling characteristic information sent by the transmitting end, and determine the receiving frequency of the receiving end according to the coupling characteristic information, so that the receiving frequency of the receiving end is equal to the transmitting frequency of the transmitting end best match.

The wireless charging method, device, and system provided by the embodiments of the present invention can obtain the coupling characteristic information of the opposite end. The coupling characteristic information is used to represent the coupling degree of the electromagnetic wave signal sent and received between the local end and the opposite end. end frequency, so that the frequency of the local end can best match the frequency of the opposite end. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of the electromagnetic wave signal can be improved by adjusting the receiving frequency of the receiving end and/or the transmitting frequency of the transmitting end, thereby improving the charging efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of a system architecture of wireless charging based on an embodiment of the present invention;

FIG. 2 is a flowchart of a wireless charging method in an embodiment of the present invention;

FIG. 3 is a flow chart of another wireless charging method in an embodiment of the present invention;

4 is a schematic diagram of a curve of an electromagnetic wave signal received by a receiving end in an embodiment of the present invention;

FIG. 5 is a flowchart of another wireless charging method in an embodiment of the present invention;

6 is a schematic structural diagram of a wireless charging device in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another wireless charging device in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a wireless charging system in an embodiment of the present invention;

FIG. 9 is a schematic diagram of another wireless charging system in an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solution in this embodiment with reference to the drawings in this embodiment. Obviously, the described embodiment is only a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

This embodiment first briefly introduces the system architecture of wireless charging. As shown in Figure 1, the system architecture includes a transmitting end for sending electromagnetic wave signals, and a receiving end for receiving electromagnetic wave signals. In practical applications, the transmitting end can be set inside the charging base, and the receiving end can be set in Inside the electronics. Both the transmitting end and the receiving end have coils for electromagnetic coupling, and the two transmit electric energy without a physical medium through electromagnetic induction.

The present embodiment will be described below based on the system architecture shown in FIG. 1 .

In order to improve the coupling degree of electromagnetic wave signals, this embodiment provides a wireless charging method, as shown in Figure 2, the method includes:

201. Acquire coupling characteristic information of the peer end.

The coupling characteristic information in this embodiment is used to characterize the coupling degree of transmitting and receiving electromagnetic wave signals between the local end and the opposite end. For example, the coupling characteristic information may be the charging efficiency of the receiving end or the transmission frequency of the transmitting end.

The device for wireless charging may be located in the receiving end shown in FIG. 1 or in the transmitting end shown in FIG. 1 . When located in the receiving end, the receiving end acts as the executing subject of this embodiment; when located in the transmitting end, the transmitting end acts as the executing subject of this embodiment.

It should be noted that the expression of the so-called "local end" or "opposite end" only reflects the relative meaning of the flow direction of the electromagnetic wave signal. When the local end is the transmitting end, the opposite end is the receiving end. Similarly, when the local end is the receiving end The opposite end is the transmitting end. The coupling feature information, as information representing the degree of coupling between the local end and the opposite end, can be obtained by the transmitting end from the receiving end or obtained by the receiving end from the transmitting end, and is used by the receiving end or the transmitting end to subsequently determine the local end Basis for frequency.

202. Determine the frequency of the local end according to the coupling characteristic information, so that the frequency of the local end and the frequency of the opposite end can be optimally matched.

When the local terminal is the receiving terminal, the local frequency is the receiving frequency, and when the local terminal is the transmitting terminal, the local frequency is the transmitting frequency. After obtaining the coupling characteristic information of the opposite end, the local end determines the frequency of the local end according to the coupling characteristic information, so that the frequency of the local end and the opposite end can achieve the best match, thereby improving the coupling of the electromagnetic wave signals sent and received between the local end and the opposite end degree.

The so-called "best match" can mean that the frequency value of the local end is equal to the frequency value of the opposite end. In practical applications, it is difficult to achieve the absolute equality of the two frequency values. within a certain allowable range. For example, when the difference between the two frequency values does not exceed 100 Hz, it is approximately considered that the two frequency values match.

In addition, the so-called "best matching" also includes making the frequency of the local end close to the frequency of the opposite end to the greatest extent according to the capability of the local end. For example, due to factors such as device aging, the maximum frequency that the local end can achieve is 1900Hz, and the frequency value of the opposite end is 2100Hz. The local end adjusts the current frequency value of 1400Hz to the maximum frequency value of 1900Hz to get as close as possible to the opposite end frequency value of 2100Hz. .

In this embodiment, the local end can execute step 201 and step 202 sequentially at the preset time value to adjust the frequency of the local end to match the frequency of the opposite end, or execute step 201 and step 202 sequentially according to the user's trigger instruction . In addition, the local end may also perform step 201 and step 202 periodically according to a preset time interval to adjust the frequency of the local end multiple times. This embodiment does not limit the timing and times of adjusting the frequency of the local end.

Generally, there are three wireless charging methods in the prior art: 1) electromagnetic induction, 2) radio waves, and 3) magnetic field resonance, all of which involve transmitting frequency and receiving frequency, such as electromagnetic wave frequency or magnetic field resonance frequency. Taking electromagnetic induction as an example, when the receiving frequency of the receiving end matches the transmitting frequency of the transmitting end (that is, when resonance occurs), the coupling degree between the receiving end and the transmitting end is the highest, that is, the charging efficiency is the highest. When the receiving frequency does not match the transmitting frequency due to factors such as period aging, the coupling degree between the receiving end and the transmitting end decreases, and the charging efficiency decreases accordingly. The current relevant scientific research has shown that the radio wave charging method can transmit a few watts of power, the electromagnetic induction charging method can transmit tens of watts to hundreds of watts of power, and the magnetic field resonance charging method can increase the transmission power to kilowatt level. For such a level of transmission power, the power waste caused by the mismatch between the receive frequency and the transmit frequency cannot be underestimated. The wireless charging method provided in this embodiment can obtain the coupling characteristic information of the opposite end. The coupling characteristic information is used to represent the coupling degree of the electromagnetic wave signal sent and received between the local end and the opposite end, and the frequency of the local end is determined according to the coupling characteristic information, so that the local The end frequency and the opposite end frequency achieve the best match. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of the electromagnetic wave signal can be improved by adjusting the receiving frequency of the receiving end and/or the transmitting frequency of the transmitting end, thereby improving the charging efficiency and reducing the The harm of electromagnetic radiation to the human body and the accelerated impact on device aging.

In the following embodiment, the method shown in FIG. 1 will be described in detail and further expanded for the two cases where the wireless charging device is located at the receiving end and the wireless charging device is located at the transmitting end.

As shown in Figure 3, when the wireless charging device is located at the receiving end, the wireless charging method includes:

301. The receiving end receives the electromagnetic wave signal sent by the transmitting end.

The receiving end can send an instruction message to the transmitting end before charging, instructing the transmitting end to send an electromagnetic wave test signal to the receiving end, and can also receive the electromagnetic wave signal sent by the transmitting end in real time during the charging process. In this embodiment, there is no limitation on the timing at which the receiving end receives the electromagnetic wave signal.

302. The receiving end extracts the transmitting frequency of the electromagnetic wave signal sent by the transmitting end.

The coupling feature information obtained by the receiving end is specifically the transmission frequency when the transmitting end sends the electromagnetic wave signal. When receiving the electromagnetic wave signal, the receiving end can obtain the coupling feature information by extracting the transmission frequency of the electromagnetic wave signal sent by the transmitting end through the radio frequency sensor.

Optionally, the specific implementation of extracting the transmission frequency at the receiving end is as follows:

302a. The receiving end obtains the frequency peak value and the frequency valley value of the electromagnetic wave signal sent by the transmitting end.

The receiving end discretely evaluates the electromagnetic wave signal received within a preset time period (for example, within 1 millisecond) to obtain multiple frequency values. The receiving end determines the frequency value with the largest value as the frequency peak value, and determines the frequency value with the smallest value as the frequency valley value. For example, the electromagnetic wave signal received by the receiving end within 1 millisecond is shown in the curve in Figure 4, and the receiving end performs discrete values of the electromagnetic wave signal at a granularity of 0.1 milliseconds to obtain 10 frequency values as shown in Figure 4 . Then 2500Hz at the receiving end is determined as the frequency peak value, and 1900Hz is determined as the frequency valley value.

302b. The receiving end performs geometric mean calculation on the acquired frequency peak value and frequency valley value to obtain the center frequency of the transmit frequency.

The calculation formula of the center frequency is shown in the following formula (1):

$\sqrt{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, A is the peak value of the frequency, and B is the valley value of the frequency. Taking Figure 4 as an example, the center frequency of the transmit frequency is Equal to 2180Hz.

303. The receiving end obtains the capacitance adjustment amount by looking up a table according to the transmission frequency of the transmitting end.

The receiving end is preset with a mapping relationship table for obtaining the capacitance adjustment value, which is used to establish the mapping relationship between the transmission frequency and the capacitance adjustment value, wherein the capacitance adjustment value can be the difference between the upper and lower plates of the capacitor in the LC circuit. The distance between d.

Optionally, the mapping relationship table is used to establish a mapping relationship between the center frequency and the capacitance adjustment amount, wherein the center frequency is the center frequency of the transmitting frequency of the transmitting end, that is, the center frequency extracted by the receiving end in step 302 . The mapping relationship table can be in the form of the following table:

Center frequency (Hz) Plate spacing (mm) 1500 2.5 1550 3.754 --> … … 2500 4.45

304. The receiving end adjusts the capacitance value of the LC loop according to the capacitance adjustment amount.

The receiving end adjusts the capacitance value of the LC loop according to the capacitance adjustment amount, thereby changing its own receiving frequency, so that the difference between its own receiving frequency and the transmitting frequency of the transmitting end is within a preset range.

Specifically, the formula for calculating the capacitance value is as follows:

C=εS/4πkd(2)

Among them, C is the capacitance value, ε is a constant, S is the facing area of the capacitor plate, k is the electrostatic force constant, and d is the distance between the capacitor plates. According to the formula (2), it can be seen that the distance d between the plates is inversely proportional to the capacitance value C, and the receiving end can reduce the capacitance value C of the LC circuit by increasing the distance d between the upper and lower plates of the capacitor, or by reducing the upper and lower poles of the capacitor The capacitance value C of the LC loop is increased by means of the plate spacing d.

Usually, the mutual conversion between the magnetic field energy of the coil and the electric field energy of the capacitor occurs inside the LC circuit, and the resulting current whose magnitude and direction change periodically is called an oscillating current. Oscillating current is a very high frequency alternating current that can only be generated by oscillating circuits such as LC circuits. In this embodiment, the principle of the receiving end adjusting the receiving frequency by changing the capacitance value of the LC loop is: by changing the ability of the capacitor to store charge, the duration of charging and discharging the capacitor is changed, thereby changing the frequency of conversion between magnetic field energy and electric field energy, and then changing The frequency of the oscillating current changes the receiving frequency.

It should be noted that, in the method shown in FIG. 3 , the frequency value and the plate spacing value d are only used for illustration, and do not constitute a limitation to specific values in practical applications.

In this embodiment, the receiving frequency of the receiving end is adjusted mainly by adjusting the spacing d of the capacitor plates. In addition, the receiving end can also adjust the receiving frequency of the receiving end by adjusting the area S of the capacitor plate. The adjustment principle is the same as The principles shown in step 304 in FIG. 3 are the same and will not be repeated here.

In practical applications, the capacitor in the LC circuit at the receiving end can also be a piezoelectric variable capacitor, and the receiving end adjusts the capacitance value by applying different voltages to the upper and lower plates of the piezoelectric variable capacitor. Specifically, the receiving end increases the voltage of the upper and lower plates of the capacitor to increase the capacitance value of the LC circuit, or decreases the voltage of the upper and lower plates of the capacitor to reduce the capacitance value of the LC circuit. When the adjustment value of the capacitor is the voltage of the upper and lower plates of the capacitor, the above mapping relationship table can also be shaped as the following table:

Center frequency (Hz) Plate voltage (mV) 1500 34 1550 77

… … 2500 120

The wireless charging method provided by this embodiment can use the receiving end as the frequency adjustment object, and the receiving end can obtain the transmission frequency of the transmitting end, and then adjust the capacitance value in its own LC circuit according to the transmission frequency, thereby adjusting its own receiving frequency It is the frequency value that best matches the transmitting frequency of the transmitting end, thereby increasing the coupling degree between the transmitting and receiving ends. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of receiving and transmitting electromagnetic wave signals between the receiving end and the transmitting end can be improved by adjusting the receiving frequency of the receiving end, thereby improving the charging efficiency.

As shown in Figure 5, when the wireless charging device is located at the transmitting end, the wireless charging method includes:

501. The transmitting end sends electromagnetic wave signals to the receiving end multiple times at different transmitting frequencies within a preset time period.

The transmitting end sends electromagnetic wave test signals to the receiving end multiple times at different transmitting frequencies. When sending electromagnetic wave signals each time, the transmitting end adjusts the capacitance value of its own LC circuit according to the preset capacitance adjustment amount, so as to generate different transmission frequencies. The preset capacitance adjustment amount may be a distance between capacitor plates, for example, 0.5 mm, and the frequency step size is a frequency variation corresponding to a distance of 0.5 mm. The transmitting end starts with the capacitance plate spacing of 0mm, increases by 0.5mm each time, and then obtains a transmitting frequency, and sends electromagnetic wave signals to the receiving end according to the transmitting frequency. The principle that the transmitter adjusts the capacitance value in its own LC loop according to the preset capacitance adjustment amount is the same as the principle that the receiver adjusts the capacitance value in its own LC loop according to the capacitance adjustment amount in step 304 in FIG. 3 , and will not be repeated here.

The transmitting end sends electromagnetic wave test signals to the receiving end multiple times before charging, and can also send electromagnetic wave signals to the receiving end in real time during the charging process. In this embodiment, there is no limitation on the timing at which the transmitting end sends the electromagnetic wave signal.

502. The transmitting end obtains the charging efficiency sent by the receiving end each time an electromagnetic wave signal is received.

The receiving end obtains its own charging efficiency in the process of receiving the electromagnetic wave signal. The charging efficiency is a percentage, which is used to represent the ratio of the electric energy actually received by the receiving end per unit time to the electric energy received under ideal conditions. For example, the charging efficiency can be 80 % or 90%.

The preset duration in this embodiment may be one minute or five minutes. Preferably, the transmitting end can continuously receive the charging efficiency sent by the receiving end during the entire charging process, for example, once every 20 seconds. When receiving the charging efficiency, the transmitting end may send request information requesting the charging efficiency to the receiving end, and receive a request response carrying the charging efficiency fed back by the receiving end. In addition, the transmitting end may also directly receive the charging efficiency sent by the receiving end according to a preset time interval, which is not limited in this embodiment.

503. The transmitting end determines the transmitting frequency corresponding to the charging efficiency with the highest efficiency value as the transmitting frequency of the transmitting end.

For example, the transmitter can obtain seven charging efficiencies of 80%, 75%, 84%, 92%, 78%, 84% and 95% within one minute. The transmitting end determines the transmitting frequency corresponding to the highest efficiency value of 95% among the seven charging efficiencies as the transmitting frequency for subsequent electromagnetic wave signals sent by the transmitting end.

For the way that the transmitting end obtains the charging efficiency by requesting information, the transmitting end can carry a flag bit not less than 1 bit in the request information, and the receiving end carries this flag bit in the request response and feeds it back to the transmitting end. The transmitting end determines the request information corresponding to the request response through the flag bit, thereby determining the sending time of the request information, and then determines the transmission frequency at the time as the transmission frequency corresponding to the charging efficiency. After determining the charging efficiency with the highest efficiency value, the transmitter determines the transmission frequency corresponding to the charging efficiency according to the request information, the request response and the flag bit, so as to determine the transmission frequency as the frequency-adjusted transmission frequency.

For the way that the transmitting end directly obtains the charging efficiency sent by the receiving end, the receiving end can carry a timestamp in the information of the charging efficiency sent, and the timestamp is used to mark the time value of the charging efficiency sent by the receiving end. Since the data exchange time between the receiving end and the transmitting end is extremely short and can be approximately ignored, when the transmitting end receives the charging efficiency, it can obtain the timestamp corresponding to the charging efficiency, and will The transmission frequency of the electromagnetic wave signal sent on the value is determined as the transmission frequency of the subsequent electromagnetic wave signal sent by the transmitting end.

Preferably, during the wireless charging process, the transmitting end can continuously receive the charging efficiency sent by the receiving end, and each time a charging efficiency is received, the efficiency value is compared with the maximum efficiency value among the previously received efficiency values , if the currently received efficiency value is greater than the largest efficiency value among previously received efficiency values, the transmitting end determines the transmitting frequency corresponding to the current efficiency value as the transmitting frequency for subsequent transmission of electromagnetic wave signals by the transmitting end.

The wireless charging method provided in this embodiment can use the transmitting terminal as the frequency adjustment object, and the transmitting terminal sends electromagnetic wave signals to the receiving terminal multiple times at different transmitting frequencies within a preset period of time, and then obtains the frequency received by the receiving terminal each time. For the charging efficiency sent by the electromagnetic wave signal, the transmitting frequency corresponding to the charging efficiency with the highest efficiency value is determined as the transmitting frequency of the transmitting end. The charging efficiency is used as the basis for the adjustment of the transmission frequency, and the transmission frequency is selected to make the coupling degree of the transmitting and receiving ends reach the best state through the method of effect verification. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of receiving and transmitting electromagnetic wave signals between the receiving end and the transmitting end can be improved by adjusting the receiving frequency of the receiving end, thereby improving the charging efficiency.

With reference to the implementation of the above method, this embodiment also provides a wireless charging device, which can be located at the receiving end or at the transmitting end, and is used to adjust the receiving frequency or the transmitting frequency of the transmitting end, so that the two The frequency of the terminal is matched, thereby improving the coupling degree of the transmitting and receiving ends. As shown in FIG. 6, the device 61 includes: an acquisition unit 611 and a determination unit 612, wherein,

The acquisition unit 611 is configured to acquire coupling characteristic information of the opposite end, and the coupling characteristic information is used to characterize the coupling degree of the electromagnetic wave signals sent and received between the local end and the opposite end;

The determining unit 612 is configured to determine the local frequency according to the coupling characteristic information obtained by the obtaining unit 611, so that the local frequency and the remote frequency can achieve an optimal match.

Further, as shown in FIG. 7, the acquiring unit 611 specifically includes:

The receiving subunit 711 is used to receive the electromagnetic wave signal sent by the transmitting end;

An extracting subunit 712, configured to extract the transmitting frequency of the transmitting end from the electromagnetic wave signal received by the receiving subunit 711;

The sending subunit 713 is used to send electromagnetic wave signals to the receiving end multiple times at different transmission frequencies within a preset time period;

The obtaining subunit 714 is used to obtain the charging efficiency sent by the receiving end each time it receives an electromagnetic wave signal, and the charging efficiency is used to represent the difference between the electric energy actually received by the receiving end and the electric energy received under ideal conditions in a unit time. Compare;

The determining unit 612 specifically includes:

A lookup subunit 715, configured to look up a table according to the transmission frequency of the transmitting end to obtain the capacitance adjustment value;

The adjusting subunit 716 is configured to adjust the capacitance value of the LC loop in the receiving end according to the capacitance adjustment value searched by the searching subunit 715, so that the receiving frequency of the receiving end and the transmitting frequency of the transmitting end are optimal match;

The determination subunit 717 is configured to determine the transmission frequency corresponding to the charging efficiency with the highest efficiency value acquired by the acquisition subunit 714 as the transmission frequency of the transmission end.

Further, the extracting subunit 712 is specifically used for:

Extracting the transmission frequency of the electromagnetic wave signal sent by the transmitting end through a radio frequency sensor;

The adjustment subunit 716 is specifically configured to adjust the capacitance value of the LC loop in the transmitting end according to the preset capacitance adjustment amount each time the sending subunit 713 sends an electromagnetic wave signal, so as to generate different transmission frequencies.

Further, the adjustment subunit 716 is specifically used to increase the distance between the upper and lower plates of the capacitor so as to reduce the capacitance value of the LC circuit;

The adjustment subunit 716 is also specifically used to reduce the distance between the upper and lower plates of the capacitor so as to increase the capacitance value of the LC circuit;

The adjustment subunit 716 is also specifically used to increase the voltage of the upper and lower plates of the capacitor so as to increase the capacitance value of the LC circuit;

The adjustment subunit 716 is also specifically used to reduce the voltage of the upper and lower plates of the capacitor so as to reduce the capacitance value of the LC loop.

The wireless charging device provided in this embodiment can obtain the coupling characteristic information of the opposite end. The coupling characteristic information is used to represent the coupling degree of the electromagnetic wave signal sent and received between the local end and the opposite end, and the frequency of the local end is determined according to the coupling characteristic information. The end frequency and the opposite end frequency achieve the best match. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of the electromagnetic wave signal can be improved by adjusting the receiving frequency of the receiving end and/or the transmitting frequency of the transmitting end, thereby improving the charging efficiency and reducing the The harm of electromagnetic radiation to the human body and the accelerated impact on device aging.

Further, referring to the method shown in FIG. 3 , this embodiment also provides a wireless charging system, which is used to implement the method shown in FIG. 3 . As shown in FIG. 8, the system includes a transmitting end 81 and a receiving end 82, and the receiving end 82 includes the wireless charging device 61 as shown in FIG. 6 or FIG. 7, wherein,

The transmitting end 81 is configured to send coupling characteristic information to the receiving end 82, and the coupling characteristic information is used to characterize the coupling degree of transmitting and receiving electromagnetic wave signals between the transmitting end 81 and the receiving end 82;

The receiving end 82 is configured to obtain the coupling characteristic information sent by the transmitting end 81, and determine the receiving frequency of the receiving end 82 according to the coupling characteristic information, so that the receiving frequency of the receiving end 82 is consistent with the The transmitting frequency of the transmitting terminal 81 is optimally matched.

The wireless charging system provided in this embodiment can use the receiving end as the frequency adjustment object, and the receiving end can obtain the coupling characteristic information of the transmitting end, and the coupling characteristic information is used to represent the coupling degree of receiving and transmitting electromagnetic wave signals between the receiving end and the transmitting end. The receiving end determines its own receiving frequency according to the coupling characteristic information, so that the receiving frequency of the receiving end and the transmitting frequency of the transmitting end can achieve an optimal match. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of the electromagnetic wave signal can be improved by adjusting the receiving frequency of the receiving end, thereby improving the charging efficiency, and at the same time reducing the harm of electromagnetic radiation to the human body and Accelerated effect on device aging.

Further, referring to the method shown in FIG. 5 , this embodiment also provides a wireless charging system, which is used to implement the method shown in FIG. 5 . As shown in FIG. 9, the system includes a transmitting end 91 and a receiving end 92. The transmitting end 91 includes the wireless charging device 61 as shown in FIG. 6 or FIG. 7, wherein,

The receiving end 92 is configured to send coupling characteristic information to the transmitting end 91, and the coupling characteristic information is used to characterize the coupling degree of transmitting and receiving electromagnetic wave signals between the receiving end 92 and the transmitting end 91;

The transmitting end 91 is configured to obtain the coupling characteristic information sent by the receiving end 92, and determine the transmitting frequency of the transmitting end 91 according to the coupling characteristic information, so that the transmitting frequency of the transmitting end 91 is consistent with the The receiving frequency of the receiving terminal 92 achieves the best match.

The wireless charging system provided in this embodiment can use the transmitting end as the frequency adjustment object, and the transmitting end can obtain the coupling characteristic information of the receiving end, and the coupling characteristic information is used to represent the coupling degree of receiving and transmitting electromagnetic wave signals between the receiving end and the transmitting end. The transmitting end determines its own transmitting frequency according to the coupling characteristic information, so that the transmitting frequency of the transmitting end and the receiving frequency of the receiving end achieve the best match. Compared with the fixed frequency values of the receiving end and the transmitting end in the prior art, the coupling degree of the electromagnetic wave signal can be improved by adjusting the transmitting frequency of the transmitting end, thereby improving the charging efficiency, and at the same time reducing the harm of electromagnetic radiation to the human body and Accelerated effect on device aging.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. A method of wireless charging, comprising:

acquiring coupling characteristic information of an opposite terminal, wherein the coupling characteristic information is used for representing the coupling degree of receiving and transmitting electromagnetic wave signals between a local terminal and the opposite terminal;

determining the local end frequency according to the coupling characteristic information so that the local end frequency and the opposite end frequency can be optimally matched;

the acquiring of the coupling characteristic information of the opposite terminal specifically includes: receiving an electromagnetic wave signal sent by a transmitting terminal, and extracting the transmitting frequency of the electromagnetic wave signal sent by the transmitting terminal;

determining the local frequency according to the coupling characteristic information specifically includes: obtaining a capacitance adjustment quantity according to the transmission frequency lookup table of the transmitting end, and adjusting the capacitance value of an LC loop in the receiving end according to the capacitance adjustment quantity so that the receiving frequency of the receiving end and the transmission frequency of the transmitting end are optimally matched;

or,

the acquiring of the coupling characteristic information of the opposite terminal specifically includes: the method comprises the steps that electromagnetic wave signals are sent to a receiving end for multiple times within preset time length at different sending frequencies, charging efficiency sent by the receiving end when the receiving end receives the electromagnetic wave signals every time is obtained, and the charging efficiency is used for representing the ratio of electric energy actually received by the receiving end in unit time to electric energy received under ideal conditions;

determining the local frequency according to the coupling characteristic information specifically includes: and determining the transmitting frequency corresponding to the charging efficiency with the highest efficiency value as the transmitting frequency of the transmitting end.

2. The wireless charging method according to claim 1, wherein the extracting a transmission frequency at which the transmitting end transmits the electromagnetic wave signal specifically comprises:

extracting the transmitting frequency of the electromagnetic wave signal transmitted by the transmitting terminal through a radio frequency sensor;

the method for sending the electromagnetic wave signals to the receiving end for multiple times at different sending frequencies within the preset time specifically comprises the following steps:

and when the electromagnetic wave signal is sent every time, the capacitance value of the LC loop in the transmitting end is adjusted according to the preset capacitance adjustment quantity so as to generate different transmitting frequencies according to the preset frequency step length.

3. The wireless charging method according to claim 1 or 2, wherein when the capacitance adjustment amount is a distance between an upper plate and a lower plate of the capacitor, the adjusting of the capacitance value of the LC circuit specifically comprises:

increasing the distance between the upper and lower electrode plates of the capacitor so as to reduce the capacitance value of the LC circuit, or decreasing the distance between the upper and lower electrode plates of the capacitor so as to increase the capacitance value of the LC circuit;

or, when the capacitance adjustment amount is a voltage, the adjusting the capacitance value of the LC circuit specifically includes:

the voltage of the upper and lower plates of the capacitor is increased so as to increase the capacitance value of the LC circuit, or the voltage of the upper and lower plates of the capacitor is reduced so as to reduce the capacitance value of the LC circuit.

4. An apparatus for wireless charging, comprising:

the device comprises an acquisition unit, a comparison unit and a comparison unit, wherein the acquisition unit is used for acquiring coupling characteristic information of an opposite terminal, and the coupling characteristic information is used for representing the coupling degree of receiving and transmitting electromagnetic wave signals between a local terminal and the opposite terminal;

the determining unit is used for determining the local frequency according to the coupling characteristic information acquired by the acquiring unit so that the local frequency and the opposite frequency can be optimally matched;

the acquiring unit specifically includes:

the receiving subunit is used for receiving the electromagnetic wave signal sent by the transmitting end;

an extraction subunit, configured to extract a transmission frequency of the transmitting end from the electromagnetic wave signal received by the receiving subunit;

the determining unit specifically includes:

the searching subunit is used for searching a table according to the transmitting frequency of the transmitting end to obtain the capacitance regulating quantity;

the adjusting subunit is used for adjusting the capacitance value of the LC loop in the receiving end according to the capacitance adjusting quantity searched by the searching subunit so that the receiving frequency of the receiving end and the transmitting frequency of the transmitting end are optimally matched;

or,

the acquiring unit specifically includes:

the transmitting subunit is used for transmitting the electromagnetic wave signals to the receiving end for multiple times at different transmitting frequencies within a preset time length;

the acquiring subunit is used for acquiring the charging efficiency sent by the receiving end each time the receiving end receives the electromagnetic wave signal, wherein the charging efficiency is used for representing the ratio of the electric energy actually received by the receiving end in unit time to the electric energy received under an ideal condition;

the determining unit specifically includes:

and the determining subunit is configured to determine, as the transmitting frequency of the transmitting end, the transmitting frequency corresponding to the charging efficiency with the highest efficiency value acquired by the acquiring subunit.

5. The wireless charging device according to claim 4, wherein the extraction subunit is specifically configured to:

extracting the transmitting frequency of the electromagnetic wave signal transmitted by the transmitting terminal through a radio frequency sensor;

the regulating subunit is specifically configured to:

and when the sending subunit sends the electromagnetic wave signal each time, the capacitance value of the LC loop in the transmitting end is adjusted according to a preset capacitance adjustment quantity so as to generate different transmitting frequencies according to a preset frequency step.

6. The wireless charging apparatus according to claim 4 or 5, wherein:

the adjusting subunit is specifically used for increasing the distance between the upper and lower electrode plates of the capacitor so as to reduce the capacitance value of the LC circuit;

the adjusting subunit is further specifically configured to reduce a distance between an upper electrode plate and a lower electrode plate of the capacitor so as to improve a capacitance value of the LC circuit;

the regulating subunit is also specifically configured to increase the voltage of the upper and lower plates of the capacitor so as to increase the capacitance of the LC circuit;

the adjusting subunit is further specifically configured to reduce voltages of upper and lower plates of the capacitor so as to reduce a capacitance value of the LC circuit.

7. A wireless charging system, comprising a transmitting end and a receiving end, wherein the transmitting end comprises the wireless charging apparatus according to any one of claim 4 to claim 6,

the receiving end is used for sending coupling characteristic information to the transmitting end, and the coupling characteristic information is used for representing the coupling degree of the receiving and transmitting electromagnetic wave signals between the receiving end and the transmitting end;

the transmitting terminal is used for acquiring the coupling characteristic information sent by the receiving terminal and determining the transmitting frequency of the transmitting terminal according to the coupling characteristic information so that the transmitting frequency of the transmitting terminal and the receiving frequency of the receiving terminal can be optimally matched.

8. A wireless charging system, comprising a transmitting end and a receiving end, wherein the receiving end comprises the wireless charging apparatus according to any one of claims 4 to 6,

the transmitting terminal is used for transmitting coupling characteristic information to the receiving terminal, and the coupling characteristic information is used for representing the coupling degree of the transmitting and receiving electromagnetic wave signals between the transmitting terminal and the receiving terminal;

the receiving end is used for acquiring the coupling characteristic information sent by the transmitting end and determining the receiving frequency of the receiving end according to the coupling characteristic information so that the receiving frequency of the receiving end and the transmitting frequency of the transmitting end can be optimally matched.