CN111404288A - Wireless charging equipment - Google Patents
Wireless charging equipment Download PDFInfo
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- CN111404288A CN111404288A CN202010362537.8A CN202010362537A CN111404288A CN 111404288 A CN111404288 A CN 111404288A CN 202010362537 A CN202010362537 A CN 202010362537A CN 111404288 A CN111404288 A CN 111404288A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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Abstract
The application discloses wireless battery charging outfit includes: n charging circuits, each charging circuit comprising a transmitting coil; under the condition that the wireless charging equipment charges the receiving equipment, transmitting coils in the M charging circuits are in a working state; the first working frequency corresponding to the first charging circuit is the same as the second working frequency corresponding to the second charging circuit, and the difference value between the first working frequency and the frequency of the amplitude shift keying ASK signal is greater than a first preset threshold; or the first working frequency is different from the second working frequency, and the difference value between the first working frequency and the second working frequency is greater than a second preset threshold; the first charging circuit and the second charging circuit are any two of the M charging circuits. The application can realize the simultaneous working of a plurality of charging circuits to improve the charging power, and can also reduce the interference generated by the charging circuits to the ASK signal during working.
Description
Technical Field
The application relates to the technical field of electronic products, in particular to a wireless charging device.
Background
With the development of wireless charging technology, the application of the wireless charging function in the electronic device is more and more popular, and the electronic device with the wireless charging function is more and more favored by users. A Wireless charging scheme based on Wireless Power Consortium (WPC) standard, which is generally a charging scheme of a single-coil system; the charging scheme of the single-coil system has limited output power, and the maximum output power is the maximum output power that the single-coil charging circuit can provide, for example, the maximum output power of many single-coil charging circuits can only support 40W. Currently, the charging power of the wireless charging scheme is low.
Disclosure of Invention
The embodiment of the application provides wireless charging equipment to solve the problem that the charging power of a wireless charging scheme in the prior art is low.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a wireless charging device, including:
n charging circuits, each of which comprises a transmitting coil; when the wireless charging equipment charges a receiving device, the transmitting coils in the M charging circuits are in a working state;
a first working frequency corresponding to the first charging circuit is the same as a second working frequency corresponding to the second charging circuit, and the difference between the first working frequency and the frequency of an Amplitude Shift Keying (ASK) signal is greater than a first preset threshold;
or the first working frequency is different from the second working frequency, and the difference value between the first working frequency and the second working frequency is greater than a second preset threshold;
the first charging circuit and the second charging circuit are any two of the M charging circuits; n, M is a positive integer greater than 1, and M is less than or equal to N.
In this way, in the above scheme of the present application, the wireless charging device includes N charging circuits, and in the N charging circuits, when the wireless charging device charges the receiving device, the transmitting coils in M charging circuits may be in an operating state, that is, when the wireless charging device charges the receiving device, there may be more than or equal to 2 charging circuits in the wireless charging device that operate simultaneously, so as to improve charging power, thereby improving charging efficiency; and because the charging circuit in the working state meets the following conditions: under the condition that the working frequencies of any two charging circuits are the same, the difference value between the working frequency and the frequency of the ASK signal is larger than a first preset threshold; or under the condition that the working frequencies of any two charging circuits are different, the difference value between the two charging circuits is larger than a second preset threshold, so that the interference of the working frequency of the charging circuit in the working state on the ASK signal is reduced.
Drawings
Fig. 1 shows one of the block diagrams of the wireless charging device according to the embodiment of the present application;
fig. 2 shows a second block diagram of the wireless charging device according to the embodiment of the present application;
FIG. 3 is a graph showing gain versus frequency for an embodiment of the present application;
fig. 4 is a waveform diagram illustrating an operating frequency of a charging circuit according to an embodiment of the present application for ASK signal interference;
fig. 5 is a second waveform diagram illustrating the interference of the operating frequency of the charging circuit to the ASK signal according to the embodiment of the present application;
fig. 6 is a third waveform diagram illustrating the operating frequency of the charging circuit according to the embodiment of the present application against ASK signal interference.
Description of reference numerals:
1. a wireless charging device;
11. a charging circuit;
12. a control chip;
111. a transmitting coil;
112. a driving chip;
113. an inverter circuit;
114. a resonant circuit;
2. a receiving device;
211. a receiving coil;
212. a receiving chip;
213. and (4) other parts.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present application provides a wireless charging device 1, including: n charging circuits 11, each of the charging circuits 11 respectively including a transmitting coil 111; in the case where the wireless charging apparatus 1 charges the receiving apparatus 2, the transmitting coils 111 in M of the charging circuits 11 are in an operating state;
the first working frequency corresponding to the first charging circuit is the same as the second working frequency corresponding to the second charging circuit, and the difference between the first working frequency and the frequency of the ASK signal is greater than a first preset threshold;
or the first working frequency is different from the second working frequency, and the difference value between the first working frequency and the second working frequency is greater than a second preset threshold;
the first charging circuit and the second charging circuit are any two of the M charging circuits 11; n, M is a positive integer greater than 1, and M is less than or equal to N.
Optionally, when M is 2, for example, in a case where the M charging circuits include a first charging circuit and a second charging circuit, as an implementation manner: a first working frequency corresponding to the first charging circuit is the same as a second working frequency corresponding to the second charging circuit, and the difference between the first working frequency and the frequency of the ASK signal is greater than a first preset threshold. The first operating frequency is the same as the second operating frequency, and may be the same as the second operating frequency, or the deviation between the first operating frequency and the second operating frequency is within a preset range, where the preset range is a range in which the degree of interference on the ASK signal is lower than a predetermined degree, that is, a certain deviation may exist between the first operating frequency and the second operating frequency, but the ASK signal should be prevented from being greatly interfered.
Like this, through setting up first operating frequency and second operating frequency and being the same, just the difference between the frequency of first operating frequency and ASK signal is greater than first preset threshold, can guarantee that first charging circuit and second charging circuit can work simultaneously when wireless charging device 1 charges to receiving equipment 2 to improve charging power, and reduce the interference of the operating frequency of first charging circuit and second charging circuit to ASK signal.
As another implementation: the first working frequency is different from the second working frequency, for example, the first working frequency is greater than the second working frequency, or the second working frequency is greater than the first working frequency, and a difference between the first working frequency and the second working frequency is greater than a second preset threshold.
Therefore, by setting the difference value between the first working frequency and the second working frequency to be greater than the second preset threshold, when the wireless charging device 1 charges the receiving device 2, the first charging circuit and the second charging circuit can be ensured to work simultaneously, so that the charging power is improved, and the interference of the working frequencies of the first charging circuit and the second charging circuit on the ASK signal is reduced.
Optionally, in a case that M is equal to 3, the M charging circuits include: the first charging circuit, the second charging circuit and a third charging circuit; as an implementation: a first working frequency corresponding to the first charging circuit, a second working frequency corresponding to the second charging circuit and a third working frequency corresponding to the third charging circuit are the same, and the difference between the first working frequency and the frequency of the ASK signal is greater than the first preset threshold;
like this, through setting up first operating frequency, second operating frequency and third operating frequency the same, just the difference between the frequency of first operating frequency and ASK signal is greater than first predetermined threshold, can guarantee that first charging circuit, second charging circuit and third charging circuit can work simultaneously when wireless charging device 1 charges to receiving equipment 2 to improve charging power, and reduce the interference of the operating frequency of first charging circuit, second charging circuit and third charging circuit to the ASK signal.
As another implementation: the first working frequency is the same as the second working frequency, and the difference value between the first working frequency and the third working frequency is greater than a second preset threshold;
in this way, the working frequencies of two of the 3 charging circuits are set to be the same, and the difference between the working frequency and the frequency of the ASK signal is greater than a first preset threshold; and the difference value between the working frequency and the working frequency of the other charging circuit is greater than the second preset threshold, so that when the wireless charging device 1 charges the receiving device 2, the first charging circuit, the second charging circuit and the third charging circuit can work simultaneously, the charging power is improved, and the interference of the working frequencies of the first charging circuit, the second charging circuit and the third charging circuit on the ASK signal is reduced.
As another implementation manner, a difference between any two of the first operating frequency, the second operating frequency, and the third operating frequency is respectively greater than the second preset threshold, that is, a difference between the first operating frequency and the second operating frequency is greater than the second preset threshold, a difference between the second operating frequency and the third operating frequency is greater than the second preset threshold, and a difference between the first operating frequency and the third operating frequency is greater than the second preset threshold.
Like this, through setting up that the difference of the operating frequency between arbitrary two in 3 charging circuit is greater than respectively the second presets the threshold, can guarantee that first charging circuit, second charging circuit and third charging circuit can work simultaneously when wireless charging device 1 charges to receiving equipment 2 to improve charging power, and reduce the interference of the operating frequency of first charging circuit, second charging circuit and third charging circuit to the ASK signal.
Optionally, when M is greater than 3, the operating frequencies of the M charging circuits are the same, and the operating frequency should be greater than a first preset threshold; the different working frequencies are different, and it should be satisfied that the difference between the different working frequencies is greater than the second preset threshold, which is similar to the above embodiments of the present application and is not described herein again.
In the above solution, the wireless charging device includes N charging circuits 11, and in a case that the wireless charging device 1 charges the receiving device 2, among the N charging circuits 11, the transmitting coils 111 in M charging circuits 11 may be in an operating state, that is, in a case that the wireless charging device 1 charges the receiving device 2, more than or equal to 2 charging circuits in the wireless charging device 1 may operate simultaneously to improve charging power, so as to improve charging efficiency; and because the charging circuit 11 in the operating state satisfies: when the operating frequencies of any two charging circuits 11 are the same, the difference between the operating frequency and the frequency of the ASK signal is greater than a first preset threshold; or under the condition that the operating frequencies of any two charging circuits 11 are different, the difference between the two operating frequencies is greater than a second preset threshold, so that the interference of the operating frequency of the charging circuit 11 in the operating state on the ASK signal is reduced.
Alternatively, in the case where the wireless charging apparatus 1 charges the receiving apparatus 2, the positions of the M transmitting coils 111 in the M charging circuits 11 and the positions of the M receiving coils 211 in the receiving apparatus 2 correspond one to one.
For example: the wireless charging device 1 is provided with 2 charging circuits 11, and when the wireless charging device 1 charges the receiving device 2, the 2 charging circuits 11 are all in an operating state; the receiving device 2 may also have 2 receiving coils 211 corresponding to the positions of the transmitting coils 111 in the wireless charging device 1, such as: when the wireless charging device 1 is connected to the receiving device 2 and charges the receiving device 2, the first transmitting coil in the wireless charging device 1 is arranged corresponding to the first receiving coil in the receiving device 2, and the second transmitting coil in the wireless charging device 1 is arranged corresponding to the second receiving coil in the receiving device 2, so that the receiving device 2 can simultaneously receive electric signals from the 2 transmitting coils 111 in the wireless charging device 1 through the 2 receiving coils 211, thereby realizing high-power charging.
Another example is: the wireless charging device 1 is provided with 3 charging circuits 11, and in the case that the wireless charging device 1 charges the receiving device 2, 2 charging circuits in the 3 charging circuits 11 are in an operating state;
as an implementation manner, the receiving device 2 may have 2 receiving coils 211 therein, and these 2 receiving coils 211 may be disposed in a one-to-one correspondence with the transmitting coil 111 in the operating state in the wireless charging device 1, such as: when the wireless charging device 1 is connected to the receiving device 2 and charges the receiving device 2, the first transmitting coil in the wireless charging device 1 is arranged corresponding to the first receiving coil in the receiving device 2, and the second transmitting coil in the wireless charging device 1 is arranged corresponding to the second receiving coil in the receiving device 2, so that the receiving device 2 can simultaneously receive electric signals from the 2 transmitting coils 111 in the wireless charging device 1 through the 2 receiving coils 211, thereby realizing high-power charging.
As another implementation manner, the receiving device 2 may also have 3 or more than 3 receiving coils 211, and 2 of the receiving coils 211 in the receiving device 2 may be arranged in a one-to-one correspondence with the transmitting coils 111 in the wireless charging device 1 in the operating state; such as: when the wireless charging device 1 is connected to the receiving device 2 and charges the receiving device 2, the first transmitting coil in the wireless charging device 1 is arranged corresponding to the first receiving coil in the receiving device 2, and the second transmitting coil in the wireless charging device 1 is arranged corresponding to the second receiving coil in the receiving device 2, so that the receiving device 2 can simultaneously receive electric signals from the 2 transmitting coils 111 in the wireless charging device 1 through the 2 receiving coils 211, thereby realizing high-power charging.
For another example: the wireless charging device 1 is provided with 3 charging circuits 11, and in the case that the wireless charging device 1 charges the receiving device 2, the 3 charging circuits 11 in the wireless charging device 1 are all in an operating state;
as an implementation manner, the receiving device 2 also has 3 receiving coils 211 therein, and these 3 receiving coils 211 may be disposed in one-to-one correspondence with the transmitting coils 111 in the wireless charging device 1, such as: when the wireless charging device 1 is connected to the receiving device 2 and charges the receiving device 2, the first transmitting coil in the wireless charging device 1 is arranged corresponding to the first receiving coil in the receiving device 2, the second transmitting coil in the wireless charging device 1 is arranged corresponding to the second receiving coil in the receiving device 2, and the third transmitting coil in the wireless charging device 1 is arranged corresponding to the third receiving coil in the receiving device 2, so that the receiving device 2 can receive an electric signal from the transmitting coil 111 of the wireless charging device 1 through 3 receiving coils 211 at the same time, thereby realizing high-power charging.
Certainly, the number of the receiving coils in the receiving device 2 may also be greater than 3, and in the case that the wireless charging device 1 is connected to the receiving device 2 and charges the receiving device 2, it may be sufficient that 3 receiving coils in the receiving device 2 and 3 transmitting coils in the wireless charging device 1 in the working state are set in a one-to-one correspondence manner (the specific setting manner is similar to the above embodiment, and is not described here again), so as to ensure that the receiving device 2 can receive the electrical signal from the transmitting coil 111 of the wireless charging device 1 through the 3 receiving coils 211 at the same time, and implement high-power charging.
Further, the number of transmitting coils in the wireless charging apparatus 1, in the case where the wireless charging apparatus 1 charges the receiving apparatus: the number of the transmitting coils in the wireless charging device 1 in the operating state and the number of the receiving coils in the receiving device 2 may be other embodiments besides the above-described embodiments; for example: the number of the transmitting coils in the wireless charging device 1 in the operating state may be determined according to the number of the receiving coils in the connected receiving device 2 and the corresponding positions thereof, and the embodiment of the present application is not limited thereto.
Thus, the N charging circuits 11 are arranged in the wireless charging device 1, and by controlling the working states of the M charging circuits 11 in the N charging circuits 11, high-power charging can be realized, and the interference of the charging circuits 11 on ASK signals during working is reduced;
in addition, the number of the transmitting coils in the wireless charging device 1 in the working state may be determined according to the number of the receiving coils in the connected receiving device 2, the corresponding positions thereof, and the like, and it is also possible to realize that the wireless charging device 1 can be adapted to various types of receiving devices 2 for charging.
Optionally, the first preset threshold and the second preset threshold are both related to a frequency of the ASK signal. Specifically, the first preset threshold and the second preset threshold may be set according to the frequency of the ASK signal, so that the working frequency of the charging circuit 11 is ensured to be far away from the frequency of the ASK signal by setting the first preset threshold, and the difference between the working frequencies of the charging circuits 11 with different powers is ensured to be far away from the frequency of the ASK signal by setting the second preset threshold, thereby reducing the interference of the working frequency of the charging circuit 11 on the ASK signal.
Optionally, the operating frequency of the charging circuit is within a frequency range of 90kHz to 205 kHz; for example: under the condition that the frequency of the ASK signal is 2kHz, if the operating frequencies of the charging circuits 11 are the same, the operating frequencies may be 90kHz to 205kHz, or the first preset threshold is 90kHz, and the operating frequency of the charging circuits 11 may be 90kHz or greater than 90 kHz; if the operating frequencies of the charging circuits 11 are different, the frequency corresponding to the second preset threshold is greater than or equal to 10kHz, that is, the difference between the operating frequencies may be greater than 10 kHz.
The following description is made of the operating frequency of 2 charging circuits 11 in conjunction with the case where the wireless charging device 1 has 2 charging circuits 11 and the 2 charging circuits 11 are all in an operating state when the wireless charging device 1 charges the receiving device 2:
as shown in fig. 2, the wireless charging device 1 in the embodiment of the present application may further include: the control chip 12, the said control chip 12 is connected with the said charging circuit 11 separately; the control chip 12 is configured to control M of the N charging circuits 11 to be in an operating state.
Alternatively, the input power sources of the N charging circuits 11 in the wireless charging device 1 are the same power source, and when the wireless charging device 1 charges the receiving device 2, the control chip 12 may control M charging circuits 11 in the N charging circuits 11 to be in an operating state.
Optionally, the control chip 12 is further configured to output a first control signal to the charging circuit 11, so as to control the charging circuit 11 to convert a dc electrical signal into an ac electrical signal, and transmit the ac electrical signal to the receiving device 2.
Optionally, each of the charging circuits 11 further includes: a driver chip 112 and an inverter circuit 113.
A first end of the driving chip 112 is connected to the control chip 12, a second end of the driving chip 112 is connected to a first end of the inverter circuit 113, and a second end of the inverter circuit 113 is connected to the transmitting coil 111.
The driving chip 112 is configured to amplify the first control signal output by the control chip to obtain a second control signal, and transmit the second control signal to the inverter circuit 113; the inverter circuit 113 is configured to convert a dc electrical signal into an ac electrical signal according to the second control signal, and transmit the ac electrical signal to the transmitting coil 111.
Optionally, the control chip 12, the driving chip 112 and the inverter circuit 113 are integrated into a whole. Of course, the control chip 12, the driving chip 112, and the inverter circuit 113 may also be independent modules, or the control chip 12 and the driving chip 112 are integrated into a whole, or the driving chip 112 and the inverter circuit 113 are integrated into a whole, which is not limited in this embodiment of the application.
Optionally, each of the charging circuits 11 further includes: a resonant circuit 114, the resonant circuit 114 being connected to the inverter circuit 113 and the transmitting coil 111. Optionally, the resonant circuit 114 is a resonant capacitor. The operating frequency of the charging circuit 11 is determined by the resonant circuit 114 and the transmitting coil 111 (equivalently inductance), such as the resonant point frequency.
It should be noted that, in addition to the above structure, the charging circuit in the embodiment of the present application may also include other circuit modules, such as: a circuit unit composed of a resistor, a capacitor, an inductor, a switching tube, etc., and the embodiments of the present application are not limited thereto.
Alternatively, the receiving apparatus 2 may include two receiving coils 211, and two receiving chips 212, wherein one receiving chip 212 is connected to one receiving coil 211; when the wireless charging device 1 charges the receiving device 2, one receiving coil 211 is arranged corresponding to one transmitting coil 111; thus, the receiving coil 211 converts the magnetic field energy into electric energy to generate an alternating current under the action of the alternating current magnetic field generated by the transmitting coil 111, and transmits the alternating current to the receiving chip 212; the receiving chip 212 is used to convert the received ac power into dc power, and output the dc power to other parts 213 in the receiving device 2, such as power modules or battery storage in the receiving device 2.
Optionally, data can be transmitted between the two receiving chips 212 through a communication interface, such as: the two-wire serial bus (I2C) interface ensures that the data information in the two receiving chips 212 can be transmitted to each other, and the data information of the two receiving chips 212 can be transmitted to the wireless charging device 1 through one receiving chip 212.
Specifically, the input power of the 2 charging circuits 11 in the wireless charging device 1 is the same power, and in the case that the wireless charging device 1 charges the receiving device 2, for example, one charging circuit 11 (e.g. indicated as a path) in the 2 charging circuits 11 operates at one frequency point or one frequency range, and the other charging circuit 11 (e.g. indicated as B path) operates at another frequency point or another frequency range, for example, by setting the values of the resonant capacitors and the transmitting coil 111 in the two charging circuits 11, the two charging circuits 11 generate two different resonant points to satisfy that the two charging circuits can operate normally and transmit power normally, for example, the resonant point frequency corresponding to the a path is 90kHz, and the inductance value and the capacitance value of the required transmitting coil are respectively as follows: LA＝10*10-6H、CA＝3.127*10-7F, the resonance point frequency corresponding to the path B is 105kHz, and the inductance value of the required transmitting coil and the capacitance value of the required resonance capacitor are LB＝10*10-6H、CB＝2.298*10-7F。
Optionally, when the transmitting coil and the resonant capacitor in the charging circuit are arranged, the transmission gain can also be considered, and the transmission gain expression of the a-path system is as follows:
wherein f is the resonant frequency; j is an imaginary unit; m is a mutual inductance value between the transmitting coils in the path A and the path B; cAIs the capacitance value of the resonance capacitor in the path A; rAL is the resistance value of the transmitting coil in the A pathAThe inductance value of the transmitting coil in path A LSThe inductance value of the receiving coil corresponding to the path A; cSThe capacitance value of the resonance capacitor in the path where the receiving coil corresponding to the path A is located is set as the capacitance value of the resonance capacitor in the path where the receiving coil corresponding to the path A is located; rSThe resistance value of the receiving coil corresponding to the path A; rLIs the load impedance.
The B-path system transmission gain expression is as follows:
wherein f is the resonant frequency; j is an imaginary unit; m is a mutual inductance value between the transmitting coils in the path A and the path B; cBIs the capacitance value of the resonance capacitor in the B path; rBL as the resistance value of the transmitting coil in the B pathBThe inductance value of the transmitting coil in the B path LSThe inductance value of the receiving coil corresponding to the B channel; cSThe capacitance value of the resonance capacitor in the path where the receiving coil corresponding to the path B is located; rSThe resistance value of the receiving coil corresponding to the B path; rLIs the load impedance.
From the above formula, a gain (vertical axis) versus frequency (horizontal axis) curve can be obtained, as shown in fig. 3. f. ofA1Is the resonance point frequency of the A path, fB1Is the resonance point frequency of the B path; the more the system gain value is closer to the resonance point, the higher the available energy is, and the wireless charging system controls power transmission according to the adjustment of the working frequency; thus, f can be selectedA1And fA2The frequency point between the two is the working frequency range of the A path, f is selectedB1And fB2The frequency points in between are the operating frequency range of the B path.
The operating frequency of the charging circuit 11 in the wireless charging device 1, that is, the A, B path, is not limited to operate in a certain frequency range, but may operate in two independent fixed frequency points, such as: the operating frequency of the path a is 120kHz, the operating frequency of the path B is 130kHz, and the power control of the wireless charging system is implemented by other methods, for example, the wireless charging power transmission method includes: frequency modulation, voltage regulation, duty cycle regulation, and the like. Like this through according to above-mentioned rule can set up the operating frequency of a plurality of charging circuits in the wireless charging equipment to realize that the multichannel is wireless to charge, thereby improve charge efficiency, and can also reduce and can not produce extra voltage ripple package on the same input power.
Wherein the operating frequency range of the A path is taken as fA1And fA2In the B path in the operating frequency range of fB1And fB2In between, the A, B two paths need to satisfy the condition fA2And fB1The frequency difference between the ASK signals is far larger than the ASK signal transmission frequency, so that the problems that the ASK signals for normal communication are seriously distorted and the ASK useful signals cannot be normally demodulated due to the fact that ripple signal packets of an A, B path are superposed are avoided. Such as: the ASK signal has a frequency of 2kHz, the A, B two paths need to satisfy the condition fA2And fB1The frequency difference therebetween may be greater than 10 kHz.
The following is specifically described with reference to waveform diagrams: usually, ASK signal is 2kHz square wave signal, or a standard ASK signal is 2kHz square wave signal, for the convenience of visual waveform description, 2kHz sine wave signal is used to replace 2kHz square wave signal for description. As in fig. 4 to 6, DAFor ASK signal waveform, DBFor the waveform corresponding to the difference between the working frequencies of the A path and the B path, DABIs DAAnd DBAnd (4) the superposed signal waveform.
As shown in FIG. 4, fa＝2*103；a＝0.1；
fb＝1*103；b＝0.1；
It can be seen that when the working frequencies of the A path and the B path are different by 1kHz, DABAnd DAThe frequency and amplitude of the change are very different, i.e. the greater the ASK signal distortion.
As shown in FIG. 5, fa＝2*103；a＝0.1；
fb＝20*103；b＝0.1；
It can be seen that when the operating frequencies of the A path and the B path are different by 20kHz, DABAnd DAThe change frequency and amplitude have the same general change trend, but the part signals are lacking, namely ASK signal distortion is relative, and the distortion when the working frequency of the A path and the B path is different by 1kHz is small.
As shown in fig. 6, when the operating frequencies of the a path and the B path differ by 20kHz,DABand DAThe change frequency and amplitude have the same general change trend, and the signal loss is less, namely the ASK signal can basically keep the original signal information.
Therefore, the ASK signal amplitude and frequency are influenced more greatly when the working frequencies of the path A and the path B are closer, and the ASK signal amplitude and frequency are influenced less greatly when the working frequency difference of the path A and the path B is larger, so that the signal influenced less easily and normally demodulates, and if the difference between the working frequencies of the path A and the path B is larger than 10kHz, the ASK signal can be ensured to be normally demodulated, and the wireless charging equipment and the receiving equipment are ensured to normally communicate.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the disclosure and, therefore, the scope of the disclosure is to be defined by the appended claims.
Claims (10)
1. A wireless charging device, comprising:
n charging circuits, each of which comprises a transmitting coil; when the wireless charging equipment charges a receiving device, the transmitting coils in the M charging circuits are in a working state;
the first working frequency corresponding to the first charging circuit is the same as the second working frequency corresponding to the second charging circuit, and the difference between the first working frequency and the frequency of the amplitude shift keying ASK signal is greater than a first preset threshold;
or the first working frequency is different from the second working frequency, and the difference value between the first working frequency and the second working frequency is greater than a second preset threshold;
the first charging circuit and the second charging circuit are any two of the M charging circuits; n, M is a positive integer greater than 1, and M is less than or equal to N.
2. The wireless charging device of claim 1, wherein in the case where M equals 3, the M charging circuits comprise: the first charging circuit, the second charging circuit and a third charging circuit;
a first working frequency corresponding to the first charging circuit, a second working frequency corresponding to the second charging circuit and a third working frequency corresponding to the third charging circuit are the same, and a difference value between the first working frequency and the frequency of the ASK signal is greater than a first preset threshold;
or the first working frequency is the same as the second working frequency, and the difference between the first working frequency and the third working frequency is greater than the second preset threshold;
or, the difference between any two of the first operating frequency, the second operating frequency and the third operating frequency is respectively greater than the second preset threshold.
3. The wireless charging device according to claim 1 or 2, wherein, in a case where the wireless charging device charges a receiving device, the transmitting coils in the M charging circuits are in one-to-one correspondence with positions of M receiving coils in the receiving device.
4. The wireless charging device of claim 1, wherein the operating frequency of the charging circuit is within a frequency range of 90kHz to 205 kHz.
5. The wireless charging device of claim 1, wherein the ASK signal has a frequency of 2 kHz; and the frequency corresponding to the second preset threshold is greater than or equal to 10 kHz.
6. The wireless charging device of claim 1, further comprising:
the control chip is respectively connected with the charging circuit; the control chip is used for controlling M charging circuits in the N charging circuits to be in a working state.
7. The wireless charging device of claim 6, wherein the control chip is further configured to output a first control signal to the charging circuit to control the charging circuit to convert a dc signal into an ac signal and transmit the ac signal to the receiving device.
8. The wireless charging device of claim 6 or 7, wherein each charging circuit further comprises: a driving chip and an inverter circuit;
the first end of the driving chip is connected with the control chip, the second end of the driving chip is connected with the first end of the inverter circuit, and the second end of the inverter circuit is connected with the transmitting coil;
the driving chip is used for amplifying a first control signal output by the control chip to obtain a second control signal and transmitting the second control signal to the inverter circuit;
the inverter circuit is used for converting a direct current signal into an alternating current signal according to the second control signal and transmitting the alternating current signal to the transmitting coil.
9. The wireless charging device of claim 8, wherein each charging circuit further comprises:
a resonant circuit connected to the inverter circuit and the transmit coil.
10. The wireless charging device of claim 9, wherein the resonant circuit is a resonant capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362537.8A CN111404288A (en) | 2020-04-30 | 2020-04-30 | Wireless charging equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362537.8A CN111404288A (en) | 2020-04-30 | 2020-04-30 | Wireless charging equipment |
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| CN111404288A true CN111404288A (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010362537.8A Pending CN111404288A (en) | 2020-04-30 | 2020-04-30 | Wireless charging equipment |
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| WO2022247859A1 (en) * | 2021-05-27 | 2022-12-01 | 华为技术有限公司 | Wireless charging system, method and apparatus |
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