CN116266767A - Method for applying virtual load to wireless charging receiving end - Google Patents

Method for applying virtual load to wireless charging receiving end Download PDF

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Publication number
CN116266767A
CN116266767A CN202111551575.9A CN202111551575A CN116266767A CN 116266767 A CN116266767 A CN 116266767A CN 202111551575 A CN202111551575 A CN 202111551575A CN 116266767 A CN116266767 A CN 116266767A
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CN
China
Prior art keywords
wireless charging
virtual load
communication
charging receiving
receiving terminal
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CN202111551575.9A
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Chinese (zh)
Inventor
倪海欧
周天宇
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CRM ICBG Wuxi Co Ltd
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CRM ICBG Wuxi Co Ltd
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Priority to CN202111551575.9A priority Critical patent/CN116266767A/en
Priority to PCT/CN2022/135928 priority patent/WO2023109522A1/en
Publication of CN116266767A publication Critical patent/CN116266767A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • 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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a method for applying a virtual load to a wireless charging receiving end, wherein the method comprises the following steps: (1) The wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in communication connection; (2) When the wireless charging receiving terminal RX is in an idle state, adding a virtual load to the wireless charging receiving terminal RX to adjust communication waveforms and coil waveforms; (3) Judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, and reasonably using the virtual load according to a judging result. The method for applying the virtual load to the wireless charging receiving end starts from the aspects of improving the coil waveform and the communication waveform, and the virtual load applied to the wireless charging receiving end RX can enable the amplitude of alternating current signals on the coil to be stable, so that the wireless charging receiving end RX and the wireless charging transmitting end TX can be facilitated to carry out communication demodulation and decoding, and the method has a remarkable application effect.

Description

Method for applying virtual load to wireless charging receiving end
Technical Field
The invention relates to the technical field of wireless charging, in particular to the technical field of wireless charging communication demodulation and decoding, and specifically relates to a method for applying a virtual load to a wireless charging receiving end.
Background
Currently, in the "wireless charging" standard Qi, a wireless charging system is composed of two parts, namely a wireless charging transmitting end and a wireless charging receiving end, which transmit energy through a transmitting end coil and a receiving end coil, so as to perform communication. The wireless charging transmitting end is called TX for short, the wireless charging receiving end is called RX for short, wherein when the TX is powered by a power supply, the transmitting energy converts a direct current signal into an alternating current signal and transmits the alternating current signal to the coil of the TX end; the RX end receives energy, rectifies the alternating current signal induced on the RX coil into direct current and supplies power to the back end load. The energy or power required by different RX is different, and the RX adjusts the energy or power for the TX transmission communication, so that the corresponding TX can also feed back information for the RX transmission communication.
Currently, in the "wireless charging" standard Qi, the demodulation and decoding method of AM communication and FSK communication in wireless charging is roughly classified into digital demodulation and decoding and analog demodulation and decoding. The digital demodulation and decoding divides the voltage of the coil waveform containing the communication signal, and then uses an ADC to sample, and the communication content is obtained through complex calculation such as a filtering algorithm; this approach requires an ADC with high speed and accuracy to implement. The analog demodulation decoding firstly processes a coil waveform containing a communication signal into a square wave signal, and then processes the square wave signal by using an MCU to obtain communication content; this approach places high demands on the square wave signal, which is otherwise difficult to handle.
Based on this, the prior art has the defect that more hardware resources are needed and complex calculation is needed. In addition, other methods have higher requirements on signal integrity, otherwise, the complexity of the processing algorithm is increased or communication is lost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for applying a virtual load to a wireless charging receiving end, which is simple and remarkable in effect.
In order to achieve the above object, the method for applying a virtual load to a wireless charging receiving terminal according to the present invention is as follows:
the method for applying the virtual load to the wireless charging receiving end is mainly characterized by comprising the following steps of:
(1) The wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in communication connection;
(2) When the wireless charging receiving terminal RX is in an idle state, adding a virtual load to the wireless charging receiving terminal RX to adjust communication waveforms and coil waveforms;
(3) Judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, and reasonably using the virtual load according to a judging result.
Preferably, the step (2) includes the steps of:
(2.1) judging whether the actual load of the current wireless charging system is in the optimal saturated working state, if not, entering a step (2.2), otherwise, directly ending the application of the current virtual load;
(2.2) the wireless charging receiving terminal RX enters an idle state, and adds a first preset value virtual load to the wireless charging receiving terminal RX;
the receiving-end coil of the wireless charging receiving-end RX of (2.3) adjusts the amplitude of the low-level communication waveform on the current receiving-end coil to be consistent according to the received signal of the virtual load, and/or converts the sine wave signal on the receiving-end coil into a square wave signal.
Preferably, the dummy load is disposed inside the chip of the wireless charging receiving terminal RX.
Preferably, the step (3) includes the steps of:
(3.1) judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, if so, entering a step (3.2), otherwise, entering a step (3.3);
(3.2) continuing to select the virtual load using the first preset value based on the current state of the wireless charging system;
(3.3) judging whether the actual load of the wireless charging receiving terminal RX is larger than the actual load preset value in the optimal working efficiency state, if so, directly entering the step (3.7); otherwise, go to step (3.4);
(3.4) judging whether the wireless charging receiving terminal RX transmits AM communication to the wireless charging transmitting terminal TX, if so, entering a step (3.5), otherwise, entering a step (3.6);
(3.5) continuing to select the first preset value virtual load, judging whether the AM communication sent by the wireless charging receiving terminal RX is finished or not, and if so, entering the step (3.6); otherwise, repeating the step until the AM communication is completed;
selecting the virtual load to use a second preset value virtual load according to the virtual load selection step (3.6), and proceeding to the virtual load selection step (3.8);
(3.7) closing the currently selected virtual load, and returning to the step (3.1) for cycle judgment;
and (3.8) ending the selection and use of the virtual load, and returning to the step (3.1) for cycle judgment.
More preferably, the actual load preset value is set to be larger than the first preset value virtual load and the second preset value virtual load, and the first preset value virtual load is set to be larger than the second preset value virtual load.
Preferably, when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a communication state, the virtual load is increased so as to facilitate the communication demodulation decoding process between the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a non-communication state, the virtual load is reduced.
More preferably, the virtual load performs the following selection process:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period of normal communication, the virtual load selects the first preset value virtual load;
when the negotiation between the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX is completed and the FSK communication is not performed, the virtual load selects the second preset value virtual load.
More preferably, the virtual load performs the following selection process:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in AM communication, the virtual load selects the first preset value virtual load;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are not in AM communication, the virtual load selects the second preset value virtual load.
By adopting the method for applying the virtual load to the wireless charging receiving end, the virtual load applied by the wireless charging receiving end RX can enable the amplitude of alternating current signals on the coil to be stable from the aspects of improving the coil waveform and the communication waveform, and is beneficial to communication demodulation and decoding of the wireless charging receiving end RX and the wireless charging transmitting end TX; and meanwhile, the size of the virtual load is reasonably controlled so as to control the temperature rise of the chip and the overall efficiency of wireless charging. On the one hand, when the virtual load processes the sine wave alternating current signal on the coil into a square wave signal at the wireless charging receiving end RX, the virtual load is beneficial to improving the integrity of the square wave signal and reducing distortion so as to be beneficial to FSK communication demodulation and decoding of the wireless charging receiving end RX; on the other hand, the communication waveform sent by the wireless charging receiving end RX can be enabled to be consistent in high-level amplitude and low-level amplitude, and AM communication demodulation and decoding of the wireless charging sending end TX are facilitated.
Drawings
Fig. 1 is a schematic diagram of waveforms of FSK signals to be demodulated and decoded when the wireless charging system does not perform FSK communication.
Fig. 2 is a schematic diagram of an FSK signal waveform to be demodulated and decoded when the wireless charging system has distortion.
Fig. 3 is a schematic diagram of communication intervals between a wireless charging transmitting terminal TX and a wireless charging receiving terminal RX of the wireless charging system.
Fig. 4 is a flowchart of a virtual load using process of the method for applying a virtual load to a wireless charging receiver according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
Before describing in detail embodiments that are in accordance with the present invention, it should be observed that relational terms, such as first and second, are 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. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus.
The method for applying the virtual load to the wireless charging receiving end comprises the following steps:
(1) The wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in communication connection;
(2) When the wireless charging receiving terminal RX is in an idle state, adding a virtual load to the wireless charging receiving terminal RX to adjust communication waveforms and coil waveforms;
(3) Judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, and reasonably using the virtual load according to a judging result.
As a preferred embodiment of the present invention, the step (2) includes the steps of:
(2.1) judging whether the actual load of the current wireless charging system is in the optimal saturated working state, if not, entering a step (2.2), otherwise, directly ending the application of the current virtual load;
(2.2) the wireless charging receiving terminal RX enters an idle state, and adds a first preset value virtual load to the wireless charging receiving terminal RX;
the receiving-end coil of the wireless charging receiving-end RX of (2.3) adjusts the amplitude of the low-level communication waveform on the current receiving-end coil to be consistent according to the received signal of the virtual load, and/or converts the sine wave signal on the receiving-end coil into a square wave signal.
As a preferred embodiment of the present invention, the dummy load is disposed inside the chip of the wireless charging receiving terminal RX.
As a preferred embodiment of the present invention, the step (3) includes the steps of:
(3.1) judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, if so, entering a step (3.2), otherwise, entering a step (3.3);
(3.2) continuing to select the virtual load using the first preset value based on the current state of the wireless charging system;
(3.3) judging whether the actual load of the wireless charging receiving terminal RX is larger than the actual load preset value in the optimal working efficiency state, if so, directly entering the step (3.7); otherwise, go to step (3.4);
(3.4) judging whether the wireless charging receiving terminal RX transmits AM communication to the wireless charging transmitting terminal TX, if so, entering a step (3.5), otherwise, entering a step (3.6);
(3.5) continuing to select the first preset value virtual load, judging whether the AM communication sent by the wireless charging receiving terminal RX is finished or not, and if so, entering the step (3.6); otherwise, repeating the step until the AM communication is completed;
selecting the virtual load to use a second preset value virtual load according to the virtual load selection step (3.6), and proceeding to the virtual load selection step (3.8);
(3.7) closing the currently selected virtual load, and returning to the step (3.1) for cycle judgment;
and (3.8) ending the selection and use of the virtual load, and returning to the step (3.1) for cycle judgment.
As a preferred embodiment of the present invention, the actual load preset value is set to be greater than the first preset value virtual load and the second preset value virtual load, and the first preset value virtual load is set to be greater than the second preset value virtual load.
In practical application, please refer to fig. 4, when the wireless charging receiving terminal RX is in a rectification stable state and the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a normal demodulation decoding state during communication, the setting of the value of the virtual load can be reasonably set according to practical situations.
It will be appreciated that the setting of the above-mentioned parameter values is not limited to the above-mentioned values, and those skilled in the art will be able to make corresponding adjustments according to the actual experimental environment or experimental equipment.
As a preferred embodiment of the present invention, when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a communication state, the virtual load is increased so as to facilitate the communication demodulation decoding process between the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a non-communication state, the virtual load is reduced.
As a preferred embodiment of the present invention, the virtual load performs the following selection process:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period of normal communication, the virtual load selects the first preset value virtual load;
when the negotiation between the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX is completed and the FSK communication is not performed, the virtual load selects the second preset value virtual load.
As a preferred embodiment of the present invention, the virtual load performs the following selection process:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in AM communication, the virtual load selects the first preset value virtual load;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are not in AM communication, the virtual load selects the second preset value virtual load.
Tests show that in the connection establishment stage of the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX, when the RX terminal is in no-load state, the RX terminal applies a certain load, so that the amplitude of an alternating current signal on a coil of the RX terminal is stable, and the method is helpful for rectifying the alternating current signal on the coil to a direct current signal by the RX terminal; and facilitates demodulation and decoding of communications sent by TX (this communications is typically frequency modulated, FSK for short) by TX, and also facilitates demodulation and decoding of communications sent by RX (this communications is amplitude modulated, AM for short). In the technical scheme, a certain load is added when the RX end is in idle load, and is different from the real load of the rear end, and the load is added inside the RX end and is called virtual load. In the technical scheme, the virtual load can be closed and opened, and in the actual test, the virtual load during opening is provided with three choices of 8mA, 16mA and 32 mA.
In practical applications, the selection of the virtual load value is not limited to the above-mentioned value, and it can be flexibly adjusted according to the actual situation of the current wireless charging system, so as to select the most suitable value to use the virtual load to perform demodulation and decoding.
The virtual load of the corresponding RX end is applied to the inside of the RX chip, so that the heating temperature of the RX chip is increased. In the technical scheme, when the virtual load is opened, 8mA, 16mA and 32mA are closed relative to the virtual load, and the temperature of the RX chip rises to about 3 ℃, 6 and 12 ℃. The virtual load also significantly reduces the efficiency of affecting the wireless charging overall when the actual load is low. Therefore, the virtual load needs reasonable control and flexible use, and the principle is that the virtual load selects smaller current as much as possible under the normal conditions of ensuring the rectification stable work of the RX end and communication demodulation decoding, and the chip is used for generating less heat. In addition, the virtual load can be adjusted and increased during communication so that the TX and RX can be easily demodulated and decoded, and the virtual load can be reduced during non-communication.
In one embodiment of the present invention, one function of the dummy load provided on the wireless charging receiver RX is to adjust the AM communication waveform. The proper virtual load can enable the AM communication waveform to fall faster at a high level than at a low level when the AM communication waveform is changed from the high level to the low level, so that the waveform falls more steeply than the waveform without the virtual load, and the waveform is more square and whole; in addition, when the actual load is not high or the actual load is small, the amplitude of the low level of the AM communication waveform can be consistent; the AM communication sent from the RX end is easily demodulated and decoded by TX when it is transferred to the TX end through the coil.
In one specific application of the present invention, the virtual load disposed on the wireless charging receiving terminal RX has another function of adjusting the waveform of the coil, so that the sine wave signal on the coil is converted into a square wave signal with less error, and the FSK demodulation and decoding are easier.
The method for performing FSK demodulation and decoding by the wireless charging receiving terminal RX specifically comprises the following steps:
the square wave signal obtained by processing the sine wave signal on the coil is used, and then the communication data is obtained by processing by the FSK demodulation and decoding module, the obtained square wave signal is shown in fig. 1, and fig. 1 is the square wave signal to be subjected to FSK demodulation and decoding in the case of FSK-free communication.
In practical use, the FSK demodulation and decoding module of the wireless charging receiving terminal RX is found that when the software configuration is the same and the wireless charging transmitting terminal TX with the same configuration is used, the FSK demodulation and decoding result is unstable; under the technical scheme with the same condition, the FSK demodulation decoding is correct sometimes, and the FSK demodulation decoding is wrong sometimes.
Compared with the FSK 'demodulation decoding is correct', 'demodulation decoding is error' and 'FSK square wave signal to be demodulated and decoded', the FSK square wave signal when demodulation decoding is error can be found in practical application, the square wave signal changes during the period that the wireless charging receiving terminal RX transmits AM communication to the wireless charging transmitting terminal TX, and the waveform change is irregular, and the method can be concretely referred to as shown in fig. 2.
On the other hand, in practical applications, the "FSK communication feedback signal sent by the wireless charging transmitting terminal TX" is generally immediately following the "AM communication signal sent by the wireless charging receiving terminal RX", and can be specifically seen in fig. 3.
As can be seen from fig. 3, the "communication interval T5" is in the range of 3ms to 10ms in Qi wireless charging system, i.e. the FSK communication is shorter from the AM communication interval. During the AM communication from the wireless charging receiving end RX to the wireless charging transmitting end TX, if the 'FSK signal to be demodulated and decoded' has irregular and error conditions, the demodulation and decoding state of the FSK module can be in error; because the FSK communication distance AM communication time interval is shorter, the demodulation and decoding state of the FSK module may not be recovered to be normal during the communication interval time T5; this results in the FSK module demodulating decoding failing to properly demodulate decoding during the actual FSK communication signal.
In a specific embodiment of the present invention, when the virtual load of the wireless charging receiving terminal RX in the present technical solution increases to 32mA, there is almost no error when the sine wave signal on the coil is converted into the square wave signal during the AM communication from the wireless charging receiving terminal RX to the wireless charging transmitting terminal TX.
In practical application, the virtual load needs to be reasonably selected, namely, the virtual load needs to be controlled under the premise that the chip temperature is proper, the heating is not serious, and the efficiency of the whole wireless communication system is objective. In practical application, the virtual load uses 32mA during the negotiation period of relatively dense communication between the wireless charging transmitting end TX and the wireless charging receiving end RX; when no FSK communication exists after the negotiation is finished, 8mA is used for the virtual load; the virtual load can use 32mA when the AM communication of the wireless charging receiving terminal RX is performed, and the virtual load can use 8mA when the AM communication is not performed; the virtual load is turned off when the actual load is large, for example, more than 50 mA.
It will be appreciated that the specific selection of virtual load values described above may be varied and adjusted accordingly to the actual situation, and is not limited to the numerical selections given in the above embodiments, which are provided by way of illustrative reference only, and not by way of limitation.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution device.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
By adopting the method for applying the virtual load to the wireless charging receiving end, the virtual load applied by the wireless charging receiving end RX can enable the amplitude of alternating current signals on the coil to be stable from the aspects of improving the coil waveform and the communication waveform, and is beneficial to communication demodulation and decoding of the wireless charging receiving end RX and the wireless charging transmitting end TX; and meanwhile, the size of the virtual load is reasonably controlled so as to control the temperature rise of the chip and the overall efficiency of wireless charging. On the one hand, when the virtual load processes the sine wave alternating current signal on the coil into a square wave signal at the wireless charging receiving end RX, the virtual load is beneficial to improving the integrity of the square wave signal and reducing distortion so as to be beneficial to FSK communication demodulation and decoding of the wireless charging receiving end RX; on the other hand, the communication waveform sent by the wireless charging receiving end RX can be enabled to be consistent in high-level amplitude and low-level amplitude, and AM communication demodulation and decoding of the wireless charging sending end TX are facilitated.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (8)

1. A method of applying a virtual load to a wireless charging receiver, comprising the steps of:
(1) The wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in communication connection;
(2) When the wireless charging receiving terminal RX is in an idle state, adding a virtual load to the wireless charging receiving terminal RX to adjust communication waveforms and coil waveforms;
(3) Judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, and reasonably using the virtual load according to a judging result.
2. The method of applying a dummy load to a wireless charging receiver according to claim 1, wherein the step (2) comprises the steps of:
(2.1) judging whether the actual load of the current wireless charging system is in the optimal saturated working state, if not, entering a step (2.2), otherwise, directly ending the application of the current virtual load;
(2.2) the wireless charging receiving terminal RX enters an idle state, and adds a first preset value virtual load to the wireless charging receiving terminal RX;
the receiving-end coil of the wireless charging receiving-end RX of (2.3) adjusts the amplitude of the low-level communication waveform on the current receiving-end coil to be consistent according to the received signal of the virtual load, and/or converts the sine wave signal on the receiving-end coil into a square wave signal.
3. The method of claim 2, wherein the dummy load is disposed inside a chip of the wireless charging receiver RX.
4. The method of applying a dummy load to a wireless charging receiver according to claim 2, wherein said step (3) comprises the steps of:
(3.1) judging whether the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period or not, if so, entering a step (3.2), otherwise, entering a step (3.3);
(3.2) continuing to select the virtual load using the first preset value based on the current state of the wireless charging system;
(3.3) judging whether the actual load of the wireless charging receiving terminal RX is larger than the actual load preset value in the optimal working efficiency state, if so, directly entering the step (3.7); otherwise, go to step (3.4);
(3.4) judging whether the wireless charging receiving terminal RX transmits AM communication to the wireless charging transmitting terminal TX, if so, entering a step (3.5), otherwise, entering a step (3.6);
(3.5) continuing to select the first preset value virtual load, judging whether the AM communication sent by the wireless charging receiving terminal RX is finished or not, and if so, entering the step (3.6); otherwise, repeating the step until the AM communication is completed;
selecting the virtual load to use a second preset value virtual load according to the virtual load selection step (3.6), and proceeding to the virtual load selection step (3.8);
(3.7) closing the currently selected virtual load, and returning to the step (3.1) for cycle judgment;
and (3.8) ending the selection and use of the virtual load, and returning to the step (3.1) for cycle judgment.
5. The method of claim 4, wherein the actual load preset value is set to be greater than the first preset value virtual load and the second preset value virtual load, and the first preset value virtual load is set to be greater than the second preset value virtual load.
6. The method of claim 4, wherein the virtual load is applied to the wireless charging receiver,
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a communication state, the virtual load is increased so as to facilitate the communication demodulation decoding processing of the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a non-communication state, the virtual load is reduced.
7. The method of claim 6, wherein the virtual load is selected from the group consisting of:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in a negotiation period of normal communication, the virtual load selects the first preset value virtual load;
when the negotiation between the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX is completed and the FSK communication is not performed, the virtual load selects the second preset value virtual load.
8. The method of claim 6, wherein the virtual load is selected from the group consisting of:
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are in AM communication, the virtual load selects the first preset value virtual load;
when the wireless charging transmitting terminal TX and the wireless charging receiving terminal RX are not in AM communication, the virtual load selects the second preset value virtual load.
CN202111551575.9A 2021-12-17 2021-12-17 Method for applying virtual load to wireless charging receiving end Pending CN116266767A (en)

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JP6127668B2 (en) * 2013-04-08 2017-05-17 ソニー株式会社 Electronic equipment and power supply system
EP3008794B1 (en) * 2013-06-05 2020-01-01 Samsung Electronics Co., Ltd Method of generating load variation for detecting wireless power receiving unit in wireless charging, and wireless power receiving unit
CN107658924B (en) * 2017-09-15 2020-04-14 维沃移动通信有限公司 Wireless charging method and mobile terminal
CN211151628U (en) * 2019-10-22 2020-07-31 北京有感科技有限责任公司 Wireless charging receiving terminal
CN111371192B (en) * 2020-03-24 2022-06-10 山东大学 Method and system for matching robot wireless charging power and protecting open circuit

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