CN110350676B - Wireless charging communication method and device - Google Patents
Wireless charging communication method and device Download PDFInfo
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- CN110350676B CN110350676B CN201910452304.4A CN201910452304A CN110350676B CN 110350676 B CN110350676 B CN 110350676B CN 201910452304 A CN201910452304 A CN 201910452304A CN 110350676 B CN110350676 B CN 110350676B
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Abstract
The embodiment of the application provides a wireless charging communication method and device, relates to the technical field of terminals, and can solve the problem of low signal identification efficiency of a transmitting terminal and a receiving terminal during wireless charging. The method comprises the following steps: the transmitting terminal obtains a modulation signal through a modulation mode of binary on-off keying OOK; and the transmitting end generates a carrier signal in the transmitting coil according to the modulation signal, wherein the carrier signal is used for carrying out wireless charging on the receiving end, or the carrier signal is used for carrying out wireless charging and communication on the receiving end. The embodiment of the application is used for a process that a transmitting terminal sends a carrier signal to a receiving terminal for communication when wireless charging is carried out.
Description
Technical Field
The present application relates to the field of terminal technologies, and in particular, to a wireless charging communication method and apparatus.
Background
In the wireless charging system, a transmitting end and a receiving end need to communicate with each other, and the requirements of system control, information interaction and the like are met. Since there is no direct contact between the transmitting end and the receiving end, the communication between the transmitting end and the receiving end relies on wireless communication. In a wireless charging system, available wireless communication technologies include: low frequency induction Wireless charging, such as carrier communication of international standard Qi scheme established by Wireless Power Consortium (WPC) for compatible Wireless charging cradle, including amplitude modulation, frequency modulation, and phase modulation; bluetooth communication used in the high-frequency wireless charging scheme AirFuel, and the like. In a system with a high-frequency wireless environment, a plurality of transmitting devices and a plurality of receiving devices, pairing confusion easily occurs in Bluetooth communication, and the problems of control confusion and the like are caused.
In the process of wireless charging through power transmission, as shown in fig. 1, an Alternating Current (AC) power supply at a transmitting end generates a magnetic field on a transmitting coil, a receiving coil at a receiving end generates an Alternating Current through magnetic field coupling, and the Alternating Current is converted into a direct Current through a rectifier at the receiving end and is output to charge the receiving end. For communication between a transmitting terminal and a receiving terminal, the Qi wireless charging protocol realizes transmission by switching a capacitor (Cm) or a resistor (Rm) of the receiving terminalModulation of the terminal voltage Vp. That is, when Cm or Rm is switched, the coil voltage Vp at the transmitting end fluctuates accordingly, and the amplitude of the Vp signal is used for modulation: amplitude Shift Keying (ASK) implements communication. When ASK is used to implement communication, at the transmitting end, the Vp signal and the corresponding demodulated signal may be processed by using corresponding circuits such as peak detection, voltage division, amplification, and filtering, and finally a demodulated signal is obtained, as shown in fig. 2, the demodulated Vp signal and the corresponding digital signal are obtained. The demodulated signal can then be digitized, wherein the data encoding uses a bit encoding scheme (bitencoding scheme) representing a logical 0 or 1 according to different durations, for example, a periodic representation of the value tCLKThe square wave after data encoding is shown in fig. 3.
Referring to fig. 2, it can be seen that, when ASK is used to implement communication, the modulation depth (Delta-Vp) is not high, which may cause a change in the distance between the transmitting end and the receiving end, and the coupling coefficient of the coil at the transmitting end and the coil at the receiving end may change accordingly, when the coefficient is small, the quality of the demodulated signal is not high, and the problem of no signal identification or erroneous signal identification may easily occur.
Disclosure of Invention
The embodiment of the application provides a wireless charging communication method and device, which can solve the problem of low signal identification efficiency of a transmitting terminal and a receiving terminal during wireless charging.
In a first aspect, a communication method for wireless charging is provided, including: the transmitting terminal obtains a modulation signal through a modulation mode of binary on-off keying OOK; and the transmitting end generates a carrier signal in the transmitting coil according to the modulation signal, wherein the carrier signal is used for carrying out wireless charging on the receiving end, or the carrier signal is used for carrying out wireless charging and communication on the receiving end. That is, when the transmitting end communicates with the receiving end, the carrier signal can ensure that the receiving end can transmit the communication signal to the receiving end while charging normally. Because this application utilizes switching signal modulation high frequency drive signal, the modulation mode is OOK, and the modulation signal has two kinds of states of height, and the modulation coefficient of signal is higher than ASK's mode, and the modulation degree of depth is wanting big, and communication is more stable, even transmitting terminal and receiving terminal are under very near or very far away distance, and the receiving terminal also can accurate demodulation signal, when receiving terminal demodulation signal like this, be favorable to demodulation signal's interference killing feature for communication performance satisfies the big characteristics of charge range.
It should be understood that, compared to the prior art, in the high-frequency wireless communication process, in the prior art, the transmitting end receives and demodulates the communication signal from the receiving end, the modulation mode is ASK, in the present application, the transmitting end sends the communication signal to the receiving end, and the modulation mode of the communication signal is OOK.
In one possible design, the obtaining, by the transmitting end, the modulation signal in a modulation mode of binary on-off keying OOK includes: the transmitting end modulates the high-frequency driving signal in an OOK modulation mode, or modulates the high-frequency driving signal and the communication signal to obtain a modulation signal; the high-frequency driving signal is used for representing the magnetic field frequency of the transmitting terminal for wireless charging; the communication signal is a switching signal for transmitting data by the transmitting terminal. That is to say, in the process of wirelessly charging the transmitting end to the receiving end through the high-frequency wireless driving signal, if the transmitting end needs to send a communication signal to the receiving end, the high-frequency driving signal and the communication signal (switching signal) may be modulated through an OOK modulation method to obtain a modulated signal.
In one possible design, the generating, by the transmitting end, the carrier signal at the transmitting coil according to the modulation signal includes: the transmitting terminal generates an alternating current magnetic field on a coil of the transmitting terminal according to the modulation signal so as to send a carrier signal to the receiving terminal. That is, the transmitting end finally acquires the modulation signal from the receiving coil of the receiving end in a manner that the transmitting coil generates a magnetic field.
In a second aspect, a communication method for wireless charging is provided, including: the receiving end receives a carrier signal through a receiving coil, wherein the carrier signal is used for wirelessly charging the receiving end, or the carrier signal is used for wirelessly charging and communicating the receiving end; and if the carrier signal is used for carrying out wireless charging and communication on the receiving end, the receiving end demodulates the voltage signal generated by the carrier signal to obtain a demodulated signal, and the modulation mode of the demodulated signal is binary on-off keying (OOK). That is, when the transmitting end communicates with the receiving end, the carrier signal can ensure that the receiving end can receive the communication signal from the transmitting end while the receiving end is normally charged. Because this application utilizes switching signal modulation high frequency drive signal, the modulation mode is OOK, and the modulation signal has two kinds of states of height, and the mode of modulation coefficient comparison ASK is wanting high, and the modulation degree of depth is wanting big, and communication is more stable, even transmitting terminal and receiving terminal are under very near or very far away distance, and the receiving terminal also can accurate demodulation signal, when receiving terminal demodulation signal like this, be favorable to demodulation signal's interference killing feature for communication performance satisfies the big characteristics of charge range.
In one possible design, the demodulating, by the receiving end, a voltage signal generated by the carrier signal to obtain a modulated signal includes: the receiving end carries out peak detection, voltage division, filtering and digital processing on a voltage signal generated by the carrier signal at the input end of a demodulation circuit of the receiving end to obtain a demodulation signal. Along with the change of the switching signal of the transmitting end, the receiving end can utilize the demodulation circuit to realize data demodulation.
In one possible design, when the carrier signal is used to wirelessly charge the receiving end, the method further includes: and the receiving end supplies power to a system of the receiving end according to the output voltage of the rectifier of the carrier signal at the receiving end. When the change of the switching signal of the transmitting end is small, the voltage of the rectifier fluctuates in a small range due to the existence of the output capacitor of the rectifier in the circuit for charging at the receiving end, and the direct current conversion circuit is further included after the rectifier in the wireless charging system, so that stable power can be supplied to a subsequent load circuit.
In a third aspect, a transmitting terminal is provided, which includes: a modulation circuit and a transmitting coil; wherein: the modulation circuit is used for acquiring a modulation signal in a binary on-off keying OOK modulation mode; and the transmitting coil is used for generating a carrier signal according to the modulation signal, and the carrier signal is used for carrying out wireless charging on the receiving end or the carrier signal is used for carrying out wireless charging and communication on the receiving end.
In one possible design, the modulation circuit is configured to modulate the high-frequency driving signal in an OOK modulation manner, or modulate the high-frequency driving signal and the communication signal to obtain a modulation signal; the high-frequency driving signal is used for representing the magnetic field frequency of the transmitting terminal for wireless charging; the communication signal is a switching signal for transmitting data by the transmitting terminal.
In one possible design, a transmitting coil is used to generate an alternating magnetic field according to a modulation signal to transmit a carrier signal to a receiving end.
In a fourth aspect, a receiving end is provided, the receiving end comprising a receiving coil and a demodulation circuit; wherein: the receiving coil is used for receiving a carrier signal, the carrier signal is used for wirelessly charging the receiving end, or the carrier signal is used for wirelessly charging the receiving end and transmitting information; and the demodulation circuit is used for demodulating a voltage signal generated by the carrier signal at the input end of the demodulation circuit to obtain a demodulation signal if the carrier signal is used for carrying out wireless charging and communication on the receiving end, wherein the modulation mode of the demodulation signal is binary on-off keying (OOK).
In one possible design, the demodulation circuit is configured to perform peak detection, voltage division, filtering, and digitization on a voltage signal generated by the carrier signal at an input of the demodulation circuit to obtain a demodulated signal.
In a possible design, when the carrier signal is used for wireless charging to the receiving end, the wireless charging system further comprises a rectifier for obtaining an output voltage according to the carrier signal and supplying power to a system at the receiving end.
From this, this application utilizes switching signal modulation high frequency drive signal, and the modulation mode is OOK, and the modulation signal has two kinds of states of height, and the mode of the relatively ASK of modulation coefficient is expected to be high, and the modulation degree of depth is expected greatly, and communication is more stable, even transmitting terminal and receiving terminal are under very near or very far away distance, and the receiving terminal also can accurate demodulation signal, when receiving terminal demodulation signal like this, is favorable to demodulation signal's interference killing feature for communication performance satisfies the big characteristics of charge range.
Drawings
Fig. 1 is a schematic circuit diagram illustrating a transmitting end wirelessly charging a receiving end and the receiving end communicating with the transmitting end through ASK modulation;
fig. 2 is a waveform diagram of a demodulated signal obtained by demodulating a communication signal of an ASK modulation scheme;
FIG. 3 is a schematic diagram of a waveform of bit encoding;
fig. 4 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 5 is a schematic diagram of a signal waveform obtained by using an OOK modulation scheme according to an embodiment of the present application;
fig. 6 is a schematic circuit structure diagram of a transmitting end according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit structure diagram of a receiving end according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of an RF circuit of a mobile phone according to an embodiment of the present disclosure;
fig. 9 is a schematic flowchart of a communication method between a transmitting end and a receiving end in a wireless charging process according to an embodiment of the present disclosure;
fig. 10 is a schematic diagram of a partial circuit structure of a transmitter at a transmitting end and a partial circuit structure of an RF circuit at a receiving end according to an embodiment of the present disclosure.
Detailed Description
For ease of understanding, some of the concepts related to the present application are illustratively presented for reference. As follows:
ASK: a relatively simple modulation scheme, corresponding to amplitude modulation in an analog signal, multiplies a carrier signal by a binary number, and can use frequency and phase as constants, amplitude as variables, and information bits transmitted by the amplitude of the carrier.
Binary On-Off Keying (OOK): it is a special case of ASK modulation, where one amplitude is 0 and the other amplitude is not 0, and a unipolar non-return-to-zero code sequence is used to control the on and off of the sinusoidal carrier. In an optical fiber communication system, the OOK modulation scheme is widely used. It should be understood that in the OOK modulation scheme, the amplitude of the carrier signal and the amplitude of the modulation signal are the same, while the amplitude of the modulation signal of ASK is smaller than the amplitude of the modulation signal of OOK, and in general, the amplitude of the modulation signal of ASK may be half of the amplitude of the carrier signal, which is understood as the modulation depth of OOK is greater than the modulation depth of ASK in the embodiment of the present application.
Modulation depth is the peak amplitude offset that must be limited in the case of double sideband amplitude modulation. Typically the ratio of the difference between the maximum and minimum amplitudes of the modulated wave to the sum of the maximum and minimum amplitudes of the carrier wave, expressed as a percentage.
Modulation signal: the low frequency signal, i.e. the information to be used, is transformed from the original information, and is loaded onto the transmitted waveform. For example, the signal sent by the computer on the internet by using a telephone line is a high-frequency digital signal, and the digital signal is loaded on an audio signal in the telephone line to complete modulation.
The network architecture of the present application may include a transmitting end 41 and a receiving end 42, as shown in fig. 4. The transmitting end 41 and the receiving end 42 can be charged wirelessly by means of electromagnetic induction or magnetic resonance.
The transmitting end 41 can wirelessly charge the receiving end 42 and communicate with the receiving end 42. The transmitting end 41 and the receiving end 42 may adopt a high-frequency wireless charging scheme, for example, an AirFuel scheme, and the transmitting end 41 and the receiving end 42 adopt a magnetic field frequency of 6.78MHz for charging and communication. During communication, for example, after the transmitting end 41 and the receiving end 42 perform bluetooth pairing, communication can be performed through bluetooth technology.
The receiving end can induce the magnetic field of the transmitting end to supply power for a system of the receiving end and communicate with the receiving end. The receiving end may be a User Equipment (UE), and the UE is a terminal device, which may be a mobile terminal device or an immobile terminal device. The device is mainly used for receiving or sending service data. The user equipments may be distributed in networks where the user equipments have different names, such as: a terminal, mobile station, subscriber unit, station, cellular telephone, personal digital assistant, wireless modem, wireless communication device, handheld device, laptop computer, cordless telephone, wireless local loop station, or the like. Specifically, the UE may be a smart phone, a tablet computer, a smart band, a smart watch, and the like.
In the prior art, in the high-frequency wireless communication process, a receiving end sends data to a transmitting end, the receiving end can generate a modulation signal, the modulation mode of the modulation signal is ASK, and the transmitting end can be used for demodulating the modulation signal received from the transmitting end, so that carrier communication from the receiving end to the transmitting end is realized. Different from the prior art, in the embodiment of the application, in the high-frequency wireless communication process, the transmitting end sends data to the receiving end, the transmitting end can generate a modulation signal, the modulation mode of the modulation signal is OOK, and the receiving end can demodulate the modulation signal received from the transmitting end, so that the carrier communication from the transmitting end to the receiving end is realized. The modulation depth of ASK is not high, and when the coupling system of the transmitting coil of the transmitting end and the receiving coil of the receiving end changes, the demodulation signal quality is not high, while when the OOK modulation mode is adopted, as shown in fig. 5, two states of high and low can be generated, and the modulation depth is deep relative to ASK, or the modulation depth of the signal is large, which is beneficial to the anti-interference capability of the demodulation signal.
In order to achieve the effect, the method and the device can improve software and hardware of the transmitting end and the receiving end, so that the transmitting end can send the modulation signal to the receiving end by using an OOK modulation mode, and the receiving end can obtain the demodulation signal to finish communication. In one example, the architecture of the transmit side includes a receiver, a processor, a memory, a transmitter (transmitter), and a bus. The receiver may be configured to receive information from the receiving end, the processor may be configured to implement the functions of the method steps of the present application, the memory may store programs and data for implementing the method steps of the transmitting end, and the transmitter may be configured to obtain a modulated signal obtained by an OOK adjustment method and generate an alternating magnetic field through the transmitting coil.
In one example, a circuit configuration of a transmitter at a transmitting end may be as shown in fig. 6, the transmitter including a modulation circuit 61, a power amplification circuit 62, a matching network circuit 63, and a transmitting coil 64. The modulation circuit 61 is configured to obtain a modulation signal according to an OOK modulation scheme; a power amplification circuit 62 for outputting an alternating current signal according to the modulation signal; a matching network circuit 63 for minimizing loss and distortion of transmission of the alternating current signal; the transmitting coil 64 is used for generating a corresponding alternating magnetic field according to the alternating current signal, so that the receiving end can sense the magnetic field.
In one example, the receiving end may be implemented by a structure as shown in fig. 7. Taking the receiving end as a mobile phone as an example, fig. 7 shows a general hardware architecture of the mobile phone for explanation. The handset shown in fig. 7 may include: radio Frequency (RF) circuitry 110, memory 120, other Input devices 130, a display screen 140, sensors 150, audio circuitry 160, an Input/Output (I/O) subsystem 170, a processor 180, and a power supply 190. Those skilled in the art will appreciate that the configuration of the handset shown in fig. 7 is not intended to be limiting and may include more or fewer components than shown, or some components may be combined, some components may be separated, or a different arrangement of components. Those skilled in the art will appreciate that the display screen 140 belongs to a User Interface (UI), and the display screen 140 may include a display panel 141 and a touch panel 142. And the handset may include more or fewer components than shown. Although not shown, the mobile phone may further include a camera, a bluetooth module, and other functional modules or devices, which are not described herein again.
Further, processor 180 is coupled to RF circuitry 110, memory 120, audio circuitry 160, I/O subsystem 170, and power supply 190, respectively. The I/O subsystem 170 is coupled to the other input devices 130, the display screen 140, and the sensors 150, respectively. The RF circuit 110 may be used for receiving and transmitting signals during information transmission and reception or during a call, and in particular, receives downlink information of a base station and then processes the received downlink information to the processor 180. The memory 120 may be used to store software programs and modules. The processor 180 executes various functional applications and data processing of the cellular phone by executing software programs and modules stored in the memory 120. Other input devices 130 may be used to receive entered numeric or character information and generate key signal inputs relating to user settings and function controls of the handset. The display screen 140 may be used to display information input by or provided to the user and various menus of the handset, and may also accept user input. The sensor 150 may be a light sensor, a motion sensor, or other sensor. Audio circuitry 160 may provide an audio interface between the user and the handset. The I/O subsystem 170 is used to control input and output peripherals, which may include other device input controllers, sensor controllers, and display controllers. The processor 180 is a control center of the mobile phone 200, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile phone 200 and processes data by operating or executing software programs and/or modules stored in the memory 120 and calling data stored in the memory 120, thereby performing overall monitoring of the mobile phone. A power supply 190 (e.g., a battery) is used to supply power to the above components, and preferably, the power supply may be logically connected to the processor 180 via a power management system, so that functions of managing charging, discharging, and power consumption are implemented via the power management system.
In the embodiment of the present application, in the handset configuration shown in fig. 7, the RF circuit 110 may include a circuit configuration as shown in fig. 8. Referring to fig. 8, the RF circuit 110 includes a receiving coil 81, a matching network circuit 82, a rectifier 83, and a demodulation circuit 84. A receiving coil 81 for inducing a magnetic field at a transmitting end to generate an alternating current to be inputted to a matching network circuit 82; a matching network circuit 82 for minimizing loss and distortion of the ac power transmission; the rectifier 83 is used for converting the alternating current output by the matching network circuit 82 into direct current to supply power to a system at a receiving end; and the demodulation circuit 84 is configured to perform signal demodulation according to the alternating current output by the matching network circuit 82 to obtain a demodulated signal, so as to obtain data information sent by the transmitting end.
With the above structure, the present application provides a communication method for wireless charging, which is used for the transmitting end and the receiving end of wireless charging. The transmitting terminal can realize a modulation function by utilizing the on-off control of an OOK modulation mode, the receiving terminal acquires a demodulation signal through a demodulation circuit, and the receiving terminal ensures that the fluctuation of output voltage is small by depending on the voltage stabilization function of a rectifier, so that the communication between the transmitting terminal and the receiving terminal and the wireless charging process are realized, or the purpose of completing in-band communication while ensuring energy transmission is achieved.
The method of the present application and the hardware circuit structure related to the present application are specifically described below.
For the transmitting end, as shown in fig. 9, the method includes:
901. and the transmitting terminal acquires the modulation signal through an OOK modulation mode.
Specifically, the transmitting end modulates a High frequency driving signal (High frequency) through an OOK modulation mode, or modulates the High frequency driving signal and a communication signal to obtain a modulation signal; the high-frequency driving signal is used for representing the magnetic field frequency of the transmitting terminal for wireless charging; the communication signal is an On-Off single (On-Off single) signal for transmitting data by a transmitting end.
That is, the high-frequency driving signal is the energy transmitted when the transmitting terminal wirelessly charges the receiving terminal. The modulated signal is data sent by the transmitting end to the receiving end, for example, the data may be data sent when the transmitting end and the receiving end perform bluetooth pairing, for example, the data may be a Media Access Control (MAC) address of the transmitting end sent by the transmitting end to the receiving end, and if the distance between the transmitting end and the receiving end is within the bluetooth identification range, the receiving end may demodulate the MAC address to complete bluetooth pairing with the transmitting end.
Referring to fig. 10, fig. 10 is a schematic diagram of a partial circuit structure of a transmitter at a transmitting end and a partial circuit structure of an RF circuit at a receiving end according to the present application. To be specific, the partial circuit structure of the transmitter at the transmitting end in fig. 10 corresponds to fig. 6, the modulation circuit 61 in fig. 6 is added to the partial circuit structure of the transmitter at the transmitting end in the present application, the modulation circuit 61 is equivalent to the and gate device a in fig. 10, and the and gate device a may use the high-frequency driving signal as a power main body and modulate the high-frequency driving signal in the OOK modulation manner of the switching signal to obtain the modulation signal.
902. And the transmitting end generates a carrier signal in the transmitting coil according to the modulation signal, wherein the carrier signal is used for carrying out wireless charging on the receiving end, or the carrier signal is used for carrying out wireless charging and communication on the receiving end.
Specifically, the transmitting terminal generates an alternating current magnetic field on a coil of the transmitting terminal according to the modulation signal so as to transmit a carrier signal to the receiving terminal. When the transmitting end has data to transmit to the receiving end, the carrier signal is used for wirelessly charging the receiving end, when the transmitting end has data to transmit to the receiving end, the carrier signal is demodulated at the receiving end on one hand to obtain a demodulated signal, and on the other hand, the current generated by the receiving end supplies power to a system of the receiving end.
Referring to fig. 10, the power amplifying circuit 62 may include a transistor c and an inductor b in fig. 10, the matching network circuit 63 in fig. 6 includes capacitances d, g, f, h and a resistance e in fig. 10, and the transmitting coil 64 includes a coil i in fig. 10, corresponding to fig. 6. The transistor c may output an alternating current according to the voltage generated by the modulation signal, and the matching network circuit 63 may process the alternating current to minimize loss and distortion of the alternating current transmission, and the processed alternating current generates an alternating current magnetic field on the coil i, the waveform of the alternating current magnetic field being, for example, as indicated by VP in fig. 10, so that the coil j at the receiving end may sense the magnetic field.
Because this application modulates switching signal and high frequency drive signal through OOK's modulation mode, the waveform VP of the modulation signal who obtains in coil i is the waveform in fig. 5, because this application utilizes switching signal modulation high frequency drive signal, the modulation mode is OOK, and the modulation signal has two kinds of states of height, and the modulation coefficient of signal is higher than ASK's mode, and the modulation degree of depth is big, when receiving terminal demodulation signal like this, is favorable to demodulating the interference killing feature of signal.
When the receiving coil of the receiving end induces the magnetic field of the carrier signal, alternating current is generated at the receiving end. Specifically, the method further comprises:
903. and the receiving end receives a carrier signal through the receiving coil, wherein the carrier signal is used for carrying out wireless charging on the receiving end, or the carrier signal is used for carrying out wireless charging and communication on the receiving end.
Referring to fig. 10, when the distance between the receiving end and the transmitting end is within the magnetic field induction range, the receiving end may induce the magnetic field of the carrier signal of the coil i through the coil j, thereby generating an alternating current in the coil j, the waveform of which is the same as the waveform of VP shown in fig. 10. The receiving coil in fig. 8 corresponds to the coil j in fig. 10.
904. When the carrier signal is communicated with the receiving end, the receiving end demodulates the voltage signal generated by the carrier signal to obtain a demodulated signal, and the modulation mode of the demodulated signal is binary on-off keying OOK.
Specifically, the receiving end performs peak detection, voltage division, filtering and digitization on a voltage signal generated by the carrier signal at the input end of a demodulation circuit of the receiving end to obtain a demodulation signal.
The matching network circuit 82 of fig. 8 includes capacitors CS and k in fig. 10 for impedance matching the ac power output by the coils to minimize losses and distortion of the ac power transmission. The voltage signal generated by the carrier signal at the input end of the demodulation circuit at the receiving end is the voltage signal of the capacitor k. The demodulation circuit 84 in fig. 8 includes capacitances n, o, and t, diodes p and q, a resistor r, and a comparator REF in fig. 10. Specifically, according to fig. 10, the demodulation circuit may include a voltage division circuit, a peak detection circuit, a filter circuit, and an analog-to-digital conversion circuit. The voltage division circuit comprises capacitors n and o and is used for reducing the amplitude of a voltage signal generated by the carrier signal at the input end of the demodulation circuit; fig. 10 shows a capacitive voltage division manner, but a resistive voltage division manner or other manners may also be adopted, which is not limited in the present application; the peak detection circuit comprises diodes p and q for detecting the envelope of the carrier signal; the filter circuit comprises a capacitor t and a resistor r and is used for filtering the high-frequency signal enveloped by the peak detection circuit to obtain a low-frequency envelope signal, namely, the ripple in the voltage is filtered to obtain a low-frequency analog signal; the analog-to-digital conversion circuit includes a comparator REF, configured to convert the analog signal obtained by the filter into a digital signal, that is, demodulate to obtain the switching signal in step 901, so that the receiving end can know the data sent by the transmitting end according to the switching signal. For example, the switch signal is the MAC address of the receiving end, and the receiving end performs bluetooth matching with the transmitting end according to the MAC address. The Analog conversion circuit may also be implemented by a Digital logic circuit or an Analog-to-Digital Converter (ADC) sampling module, and the application is not limited thereto. Along with the change of the switching signal of the transmitting end, the receiving end can realize corresponding data demodulation through the demodulation circuit.
When the carrier signal is used for wireless charging to the receiving end, the method further comprises: and the receiving end supplies power to a system of the receiving end according to the output voltage of the rectifier of the carrier signal at the receiving end.
Illustratively, referring to fig. 10, rectifier 83 includes diodes g, t, l, and m in fig. 10, corresponding to fig. 8, for converting the ac power output by matching network circuit 82 to dc power to power the system. The capacitor s in fig. 10 is used for voltage stabilization, resulting in the voltage Vrect shown in fig. 10. When the variation of the switching signal at the transmitting end is small, the voltage of the rectifier fluctuates in a small range due to the existence of the output capacitor s of the rectifier. In addition, in the wireless charging system, the circuit structure of the rectifier further includes a Direct Current-Direct Current (DC-DC) circuit for performing high-Low voltage DC-to-DC conversion, a Low Dropout Regulator (LDO) circuit, a Switched Capacitor (SC), and other DC conversion circuits, which can supply stable power to subsequent loads.
In the embodiment of the present application, the value of the capacitor S can be increased appropriately to reduce the ripple of the voltage Vrect.
Through the above description, in a high-frequency wireless charging system, the amplitude modulation communication from the transmitting end to the receiving end can be realized, during communication, the transmitting end can modulate signals according to an OOK modulation mode, and the communication signals can be transmitted to the receiving end while the voltage Vrect is ensured to meet the load requirement. Because the modulation coefficient of the OOK modulation scheme is higher than ASK, communication is stable, and even if the transmitting end and the receiving end are very close to each other or very far away from each other, the signal can be demodulated accurately. For example, the communication mechanism of the present application, in addition to the coding scheme of bit coding, can be used to solve the problem of bluetooth cross connection, assist bluetooth pairing and transfer information, and other upper layer applications. Moreover, the OOK modulation mode does not influence the power supply of a receiving end load, and the device used by the method is small and low in cost.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a Compact Disc Read-Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC). Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.
Those skilled in the art will recognize that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. A communication method for wireless charging, comprising:
the transmitting terminal obtains a modulation signal through a binary on-off keying OOK modulation mode before power amplification;
and the transmitting end generates a carrier signal in a transmitting coil according to the modulation signal, wherein the carrier signal is used for wirelessly charging a receiving end, or the carrier signal is used for wirelessly charging and communicating the receiving end.
2. The method of claim 1, wherein the obtaining, by the transmitting end, the modulated signal in a modulation manner of binary on-off keying OOK before power amplification comprises:
the transmitting end modulates a high-frequency driving signal through the OOK modulation mode, or modulates the high-frequency driving signal and a communication signal to obtain the modulation signal;
the high-frequency driving signal is used for representing the magnetic field frequency of the transmitting terminal for wireless charging;
the communication signal is a switching signal for transmitting data by the transmitting terminal.
3. The method of claim 1 or 2, wherein the transmitting end generating a carrier signal at a transmitting coil according to the modulation signal comprises:
and the transmitting end generates an alternating current magnetic field on a coil of the transmitting end according to the modulation signal so as to send the carrier signal to a receiving end.
4. A communication method for wireless charging, comprising:
a receiving terminal receives a carrier signal through a receiving coil, wherein the carrier signal is used for wirelessly charging the receiving terminal, or the carrier signal is used for wirelessly charging and communicating the receiving terminal; the carrier signal is generated in a transmitting coil according to a modulation signal obtained by a transmitting end through a binary on-off keying (OOK) modulation mode before power amplification;
and if the carrier signal is used for carrying out wireless charging and communication on the receiving end, the receiving end demodulates a voltage signal generated by the carrier signal to obtain a demodulated signal, and the modulation mode of the demodulated signal is binary on-off keying (OOK).
5. The method of claim 4, wherein the receiving end demodulates the voltage signal generated by the carrier signal to obtain a demodulated signal, and comprises:
and the receiving end carries out peak detection, voltage division, filtering and digital processing on the voltage signal generated by the carrier signal at the input end of the demodulation circuit of the receiving end to obtain the demodulation signal.
6. The method according to claim 4 or 5, wherein when the carrier signal is used for wireless charging to the receiving end, the method further comprises:
and the receiving end supplies power to a system of the receiving end according to the output voltage of the carrier signal at the rectifier of the receiving end.
7. A transmitting end, comprising: a modulation circuit and a transmitting coil; wherein:
the modulation circuit is used for acquiring a modulation signal through a binary on-off keying OOK modulation mode before power amplification;
and the transmitting coil is used for generating a carrier signal according to the modulation signal, and the carrier signal is used for wirelessly charging a receiving end, or the carrier signal is used for wirelessly charging and communicating the receiving end.
8. The transmitting end according to claim 7, wherein the modulation circuit is configured to modulate a high-frequency driving signal by using a modulation scheme of the OOK, or modulate the high-frequency driving signal and a communication signal to obtain the modulation signal;
the high-frequency driving signal is used for representing the magnetic field frequency of the transmitting terminal for wireless charging;
the communication signal is a switching signal for transmitting data by the transmitting terminal.
9. The transmitting end according to claim 7 or 8, wherein the transmitting coil is configured to generate an alternating magnetic field according to the modulation signal to transmit the carrier signal to a receiving end.
10. A receiving end, characterized in that the receiving end comprises a receiving coil and a demodulation circuit; wherein:
the receiving coil is used for receiving a carrier signal, the carrier signal is used for wirelessly charging a receiving end, or the carrier signal is used for wirelessly charging the receiving end and transmitting information; the carrier signal is generated in a transmitting coil according to a modulation signal obtained by a transmitting end through a binary on-off keying (OOK) modulation mode before power amplification;
the demodulation circuit is configured to demodulate a voltage signal generated at an input end of the demodulation circuit by the carrier signal if the carrier signal is used for performing wireless charging and communication to the receiving end, so as to obtain a demodulated signal, where a modulation mode of the demodulated signal is binary on-off keying (OOK).
11. The receiving end of claim 10, wherein the demodulation circuit is configured to perform peak detection, voltage division, filtering, and digitization on the voltage signal generated by the carrier signal at the input end of the demodulation circuit to obtain the demodulated signal.
12. The receiving end according to claim 10 or 11, further comprising a rectifier for obtaining an output voltage according to the carrier signal and supplying power to a system of the receiving end when the carrier signal is used for wirelessly charging the receiving end.
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| CN110891260A (en) * | 2019-12-05 | 2020-03-17 | 江苏紫米电子技术有限公司 | Bluetooth connection method, equipment, terminal, system and storage medium |
| WO2021217495A1 (en) * | 2020-04-29 | 2021-11-04 | 华为数字能源技术有限公司 | Long-distance wireless charging transmitting end, receiving end, and system |
| CN114362299A (en) * | 2021-12-23 | 2022-04-15 | 成都市易冲半导体有限公司 | Coil current demodulation method and circuit based on wireless charging transmitting terminal |
| CN117674914A (en) * | 2022-08-30 | 2024-03-08 | 华为技术有限公司 | Energy charging method and device |
| CN117526589A (en) * | 2024-01-03 | 2024-02-06 | 宁波赛宝信息产业技术研究院有限公司 | Wireless charging communication method |
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