CN117748649A

CN117748649A - Signal demodulation method

Info

Publication number: CN117748649A
Application number: CN202311676414.1A
Authority: CN
Inventors: 王涛; 盛火旺; 顾瑜俊; 叶兵
Original assignee: Shanghai Yingheng Electronic Co ltd
Current assignee: Shanghai Yingheng Electronic Co ltd
Priority date: 2023-12-07
Filing date: 2023-12-07
Publication date: 2024-03-22

Abstract

The application discloses a signal demodulation method. Acquiring a target signal of a target loop; determining a time judgment node according to the level jump node of the target signal; determining a voltage change value of a target signal according to the time judging node and a preset sampling duration; determining an output signal according to the voltage change value and a preset judgment threshold value; the data packet is demodulated based on the output signal. According to the technical scheme, the voltage changing back and forth is detected through the identification level jump node, so that the signal which is adopted for outputting is determined according to the voltage changing value, and data packets in wireless charging are demodulated according to the output signal. The method has the advantages that the square wave waveform of the output signal can be changed more obviously, the interference of other hardware on the signal is reduced, and the accuracy of signal demodulation is improved.

Description

Signal demodulation method

Technical Field

The application relates to the technical field of wireless charging, in particular to a signal demodulation method.

Background

With the development of society and the progress of science and technology, electric energy is taken as a representative in new energy sources, and is favored by more and more manufacturers and users due to the characteristics of cleanliness, low price and the like. In order to use the products conveniently and rapidly, many products are designed to be wirelessly charged for power supply, and how to efficiently perform wireless charging is one of the important points of researches of related technicians.

At present, for wireless charging demodulation, hardware is generally adopted to process an original signal on a resonant circuit (LC circuit), the signal is processed into a square wave model through hardware, and software reads the square wave signal and packages the square wave signal to obtain the signal content. The basic principle of hardware circuit construction is based on coherent demodulation, voltage or current envelope demodulation. Ideally, the processed signal is a square wave, and the software acquires the square wave signal and then acquires information through grouping. However, the original signal on the actual wireless charging transmitter LC may be disturbed by the model of the receiver, the selection of devices in the transmitter, or other switching modules. The signal demodulated by the simple hardware is easy to deform and even the packet content is wrong, so that the efficiency and the accuracy of signal demodulation are lower.

Disclosure of Invention

The application provides a signal demodulation method, a signal demodulation device, electronic equipment and a storage medium, so as to improve the accuracy of signal demodulation.

According to an aspect of the present application, there is provided a signal demodulation method, the method including:

acquiring a target signal of a target loop;

determining a time judgment node according to the level jump node of the target signal;

determining a voltage change value of a target signal according to the time judging node and a preset sampling duration;

determining an output signal according to the voltage change value and a preset judgment threshold value;

the data packet is demodulated based on the output signal.

According to another aspect of the present application, there is provided a signal demodulating apparatus including:

the target signal acquisition module is used for acquiring a target signal of a target loop;

the time node determining module is used for determining a time judging node according to the level jump node of the target signal;

the voltage change determining module is used for determining a voltage change value of the target signal according to the time judging node and a preset sampling duration;

the output signal determining module is used for determining an output signal according to the voltage change value and a preset judging threshold value;

and the output signal demodulation module is used for demodulating the data packet based on the output signal.

According to another aspect of the present application, there is provided an electronic device including:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the signal demodulation method of any one of the embodiments of the present application.

According to another aspect of the present application, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute a signal demodulation method according to any embodiment of the present application.

According to the technical scheme, the voltage changing back and forth is detected through the identification level jump node, so that the signal which is adopted for outputting is determined according to the voltage changing value, and data packets in wireless charging are demodulated according to the output signal. The method has the advantages that the square wave waveform of the output signal can be changed more obviously, the interference of other hardware on the signal is reduced, and the accuracy of signal demodulation is improved.

It should be understood that the description of this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1A is a flowchart of a signal demodulation method according to a first embodiment of the present application;

FIG. 1B is a flow chart of a signal output provided in a first embodiment of the present application;

FIG. 1C is a schematic diagram of a signal contrast provided in embodiment one of the present application;

fig. 2 is a schematic structural diagram of a signal demodulation device according to a second embodiment of the present application;

fig. 3 is a schematic structural diagram of an electronic device implementing a signal demodulation method according to an embodiment of the present application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

Fig. 1A is a flowchart of a signal demodulation method according to an embodiment of the present application, where the method may be applied to a case of demodulating a collected signal in a wireless charging scenario, and the method may be performed by a signal demodulation device, where the signal demodulation device may be implemented in a form of hardware and/or software, and the signal demodulation device may be configured in an electronic device. As shown in fig. 1A, the method includes:

s110, acquiring a target signal of a target loop.

The target loop may be a loop for collecting square wave signals in a wireless charging circuit. The target loop may be a resonant loop (LC loop) in a wireless charging circuit. The target signal, i.e. the circuit signal in the target loop, may be, for example, a square wave signal of a wireless charging circuit.

In an alternative embodiment, the acquiring the target signal of the target loop may include: collecting waveform signals of a target loop; and preprocessing the waveform signal in a preset mode to obtain a target signal. Wherein the preprocessing may be kalman filtering.

Because the signal of the target loop obtained by direct collection is interfered by other hardware, the square wave edge change is not obvious, the high-frequency information is too much, and the hardware demodulation error rate is easy to be high. Therefore, the directly acquired waveform signals are subjected to Kalman filtering, more high-frequency signals are filtered, and the influence of the high-frequency signals on waveforms is reduced, so that the accuracy of hardware demodulation is improved.

S120, determining a time judgment node according to the level jump node of the target signal.

The level jump node can be a node with step change in the square wave signal, and the moment of the level jump node is recorded as a time judging node. The time judging node can be used for judging the square wave period, carrying out delay detection and the like.

In the wireless charging protocol (for example, qi protocol), the data packet is divided into four parts: preamble (preamble), header (header), data frame (message) and check frame (checksum). The first part preamble is a structure, and the last three parts are formal data packets. Wherein the preamble structure is a square wave flip of tens of 250ms of the leno. A microcontroller (Microcontroller Unit, MCU) acquires the level trip node of the target signal by collecting these successive flipped square waves. The process is continuously detected, and when the level step jump is detected, the corresponding time point of the jump node can be recorded and used as a time judging node for the subsequent periodical signal detection.

S130, determining a voltage change value of the target signal according to the time judging node and a preset sampling duration.

The sampling duration may be a duration of continuously sampling the target signal from the time determination node, or a duration of continuously detecting a voltage change from the time determination node. The sampling duration may be preset by a skilled person according to practical situations or manual experiences, for example, the period of the ideal wireless charging square wave signal is 250 microseconds to 500 microseconds, and then the sampling duration may be preset to 250 microseconds. This is by way of illustration only and is not to be construed as limiting the scope of the present application.

In an optional implementation manner, the determining the voltage variation value of the target signal according to the time judging node and the preset sampling duration may include: determining a first voltage measurement value of the target signal according to the time judging node; determining a second voltage measurement value of the target signal according to the sampling duration; a voltage change value is determined from the first voltage measurement and the second voltage measurement.

The first voltage measurement value may be a voltage value that is sampled at the same time as the determination of the time determination node, that is, the detected voltage value is recorded as the first voltage measurement value while the determination of the level transition node is performed. And after detecting the level jump node and delaying for one sampling time, detecting the voltage again at the moment to obtain a second voltage measured value. And the first voltage measured value and the second voltage measured value are subjected to difference to obtain a voltage variation value.

For example, when a level jump of a signal is detected, the voltage value V1 of the signal sampled at this time is recorded. Then, the delay time is 250 microseconds (the preset signal judgment timer can be used for delaying, and the embodiment of the application does not limit the delay time), and the sampled signal value at the moment is recorded as V2. V1 and V2 are compared, and the value of |V1-V2| is used as the voltage variation value.

And S140, determining an output signal according to the voltage change value and a preset judgment threshold value.

The preset judgment threshold value is used for selecting and outputting the output signal corresponding to the voltage. The judgment threshold value can be set by a related technician according to actual conditions or manual experience, for example, the judgment threshold value can be set to be 10% -20% of the first voltage measured value acquired during level jump.

In an alternative embodiment, the determining the output signal according to the voltage variation value and the preset judgment threshold value may include: and if the voltage change value exceeds a preset judging threshold value, taking a signal corresponding to the second voltage measured value as an output signal.

Continuing the previous example, if the value of |v1-v2| exceeds the preset threshold, it is indicated that the voltage change is obvious, and the signal demodulation should be performed using the changed voltage value, for example, the preset threshold may be set to 20% of V1 (for example only), assuming that V1 is 1V, V2 is 1.4V, the voltage change is 0.4V, and the voltage change has exceeded 20% of V1 (0.2V), then the voltage change is considered obvious, and the signal corresponding to the changed second voltage measurement value (i.e., 1.4V in the example) is used as the output signal.

In another alternative embodiment, the determining the output signal according to the voltage variation value and the preset judgment threshold value may include: if the voltage change value does not exceed the preset judgment threshold value, the signal corresponding to the first voltage measurement value is used as an output signal.

Continuing the previous example, if the value of |v1-v2| does not exceed the preset threshold, it is indicated that the voltage change is not obvious, and the voltage value before the change should be used for signal demodulation, for example, the preset threshold may be set to 20% of V1 (for example only), assuming that V1 is 1V, V2 is 1.1V, the voltage change is 0.1V, and the voltage change does not exceed 20% of V1 (0.2V), then the voltage change is considered to be not obvious, and the signal corresponding to the first voltage measurement value before the change (i.e., 1V in the example) is used as the output signal.

The two embodiments described above describe how to select the output signal according to the voltage variation value, it being understood that different signals are selected for output for different voltage variations for subsequent signal demodulation. Under the condition that hardware is easy to influence signals, whether the voltage changes obviously is distinguished, so that the signals are identified more accurately, the determined waveforms of the output signals are more obvious, the influence of indistinct voltage value distinction caused by other interferences is reduced, and the accuracy of signal demodulation is further facilitated.

And S150, demodulating the data packet based on the output signal.

The data packet is demodulated using the output signal determined in the previous steps and embodiments. It should be noted that, the output signal should also be output according to frequency and period, for example, the sampling process is sequentially performed for a period of 250 microseconds, and then the output signal is also output for a period of 250 microseconds.

In a specific embodiment, as shown in fig. 1B, the ADC acquires a waveform signal on LC, and filters high-frequency clutter jitter to acquire a real signal through kalman filtering.

In the preamble stage, the ADC samples the LC loop waveform, and continuously samples and acquires the level jump node. And after the time node corresponding to the level jump node is acquired, the signal judgment timer starts to count.

In the data packet judging stage, the signal judging timer repeatedly counts 250 mu s, the ADC acquires analog signals, compares the voltage changes of 250 mu s before and after the analog signals, considers that the signals are obviously changed if the voltage changes exceed a preset threshold range, and the DAC signals output by the MCU output voltages according to the back-end ADC signals; if the threshold value is not exceeded, the DAC outputs a signal according to the original acquisition value of the ADC. And finally, the wireless charging demodulation module demodulates the data packet according to the DAC signal output by the MCU. The sampling form of the processed output signal is shown in fig. 1C, and it can be obviously seen that the output signal is selected through the judgment of the voltage change value, so that the output square waveform is more accurate and clear.

Example two

Fig. 2 is a schematic structural diagram of a signal demodulation device according to a third embodiment of the present application. As shown in fig. 2, the apparatus 200 includes:

a target signal acquisition module 210, configured to acquire a target signal of a target loop;

a time node determining module 220, configured to determine a time judgment node according to the level transition node of the target signal;

the voltage change determining module 230 is configured to determine a voltage change value of the target signal according to the time determination node and a preset sampling duration;

an output signal determining module 240, configured to determine an output signal according to the voltage change value and a preset judgment threshold;

the output signal demodulation module 250 is configured to demodulate the data packet based on the output signal.

In an alternative embodiment, the voltage change determining module 230 may include:

a first measurement value determining unit, configured to determine a first voltage measurement value of the target signal according to the time judging node;

a second measurement value determining unit, configured to determine a second voltage measurement value of the target signal according to the sampling duration;

and the voltage change value determining unit is used for determining a voltage change value according to the first voltage measured value and the second voltage measured value.

In an alternative embodiment, the output signal determining module 240 may be specifically configured to:

and if the voltage change value exceeds a preset judging threshold value, taking a signal corresponding to the second voltage measured value as an output signal.

In another alternative embodiment, the output signal determining module 240 may be specifically configured to:

if the voltage change value does not exceed the preset judgment threshold value, the signal corresponding to the first voltage measurement value is used as an output signal.

In an alternative embodiment, the target signal acquisition module 210 may include:

the signal acquisition unit is used for acquiring waveform signals of the target loop;

and the target signal determining unit is used for preprocessing the waveform signal in a preset mode to obtain a target signal.

In an alternative embodiment, the preprocessing is kalman filtering.

In an alternative embodiment, the target loop is a resonant loop.

The signal demodulation device provided by the embodiment of the application can execute the signal demodulation method provided by any embodiment of the application, and has the corresponding functional modules and beneficial effects of executing the signal demodulation methods.

Example III

Fig. 3 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement embodiments of the present application. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the application described and/or claimed herein.

As shown in fig. 3, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.

Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.

The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as signal demodulation methods.

In some embodiments, the signal demodulation method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the signal demodulation method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the signal demodulation method in any other suitable way (e.g. by means of firmware).

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.

A computer program for carrying out the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this application, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.

The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solutions of the present application are achieved, and the present application is not limited herein.

The above embodiments do not limit the scope of the application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.

Claims

1. A method of demodulating a signal, the method comprising:

acquiring a target signal of a target loop;

determining a voltage change value of the target signal according to the time judging node and a preset sampling duration;

demodulating the data packet based on the output signal.

2. The method according to claim 1, wherein the determining the voltage variation value of the target signal according to the time determination node and the preset sampling duration includes:

determining a first voltage measurement value of the target signal according to the time judging node;

determining a second voltage measurement value of the target signal according to the sampling duration;

and determining the voltage change value according to the first voltage measurement value and the second voltage measurement value.

3. The method according to claim 2, wherein determining the output signal according to the voltage variation value and a preset judgment threshold value comprises:

and if the voltage change value exceeds the preset judgment threshold value, taking a signal corresponding to the second voltage measurement value as an output signal.

4. The method according to claim 2, wherein determining the output signal according to the voltage variation value and a preset judgment threshold value comprises:

and if the voltage change value does not exceed the preset judgment threshold value, taking a signal corresponding to the first voltage measurement value as an output signal.

5. The method of any of claims 1-4, wherein the acquiring the target signal of the target loop comprises:

collecting waveform signals of a target loop;

and preprocessing the waveform signal in a preset mode to obtain a target signal.

6. The method of claim 5, wherein the preprocessing is kalman filtering.

7. The method of any one of claims 1-4, wherein the target circuit is a resonant circuit.

8. A signal demodulation apparatus, comprising:

9. An electronic device, the electronic device comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the signal demodulation method of any one of claims 1-7.

10. A computer readable storage medium storing computer instructions for causing a processor to perform the signal demodulation method of any one of claims 1-7.