CN111817454B - Wireless power supply device and control method thereof - Google Patents
Wireless power supply device and control method thereof Download PDFInfo
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- CN111817454B CN111817454B CN202010790076.4A CN202010790076A CN111817454B CN 111817454 B CN111817454 B CN 111817454B CN 202010790076 A CN202010790076 A CN 202010790076A CN 111817454 B CN111817454 B CN 111817454B
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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
- 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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The invention provides a wireless power supply device and a control method thereof. The electromagnetic resonance circuit of the driving wireless power supply device transmits magnetic field energy signals according to a preset period, wherein the period comprises: a signal transmitting stage and a transmitting interval stage; in the signal transmitting stage, the electromagnetic resonance circuit is driven to continuously transmit magnetic field energy signals; in the transmission interval stage, suspending sending the magnetic field energy signal, and acquiring an attenuation signal sensed by a feedback signal processing circuit of the wireless power supply device; judging whether attenuation abnormality occurs according to the attenuation signals, if so, interrupting the transmission of the magnetic field energy signals. According to the scheme, whether foreign matters appear in the magnetic field or not is judged by detecting the attenuation condition of the attenuation section set in the attenuation signal, so that the safety is improved.
Description
The present application is a divisional application of a chinese patent application with application number 201910683244.7, application date 2019, 7-month, 26-day, and the name of "wireless power supply device and control method thereof".
Technical Field
The present invention relates to wireless power technologies, and in particular, to a wireless power supply device and a control method thereof.
Background
The wireless power supply technology is based on the principle of electromagnetic induction, and is used for transmitting electric energy to an electric load in a short distance without contact, and is commonly used for wireless charging of portable electronic devices (such as mobile terminals, digital cameras, music players, portable power supplies and the like). The wireless power supply system is divided into a power supply end and a power receiving end, and the power supply end and the power receiving end do not need to be physically connected. The power supply end converts high-frequency alternating current by using the electric energy conversion device. The high-frequency alternating current generates a variable magnetic field, and energy is emitted out through mediums such as air; the receiving end is placed in the magnetic field of the transmitting end, the induced magnetic field signal forms current, and then the current is converted into electric energy required by the electric load through the electric energy conversion device.
The wireless power supply system uses a magnetic field as an energy transmission mode, magnetic field energy is easy to be absorbed by surrounding conductor articles, and the magnetic field energy is consumed into useless heat energy due to an eddy effect, so that on one hand, electric energy is wasted, and on the other hand, the generated heat also has potential safety hazards. Therefore, the power supply end of the existing wireless power supply system needs to identify the power receiving end before transmitting energy, and starts energy transmission after determining the power receiving end.
However, the existing powered end identification technology performs identification through a single signal, is easily affected by interference signals, and has poor identification accuracy and low reliability; and the other needs complex signal interaction between the power receiving end and the power supplying end, and has complex process and low recognition efficiency.
Disclosure of Invention
An object of the present invention is to provide a wireless power supply apparatus and a control method thereof that at least partially solve the problems of any one of the above aspects.
A further object of the present invention is to provide a simple, efficient, and highly anti-interference wireless power supply device and a control method thereof.
Another further object of the present invention is to improve the safety and reliability of a wireless power supply device and to extend its service life.
In particular, the present invention provides an electromagnetic resonance circuit for driving a wireless power supply device to transmit a magnetic field energy signal according to a preset period, the period comprising: a signal transmitting stage and a transmitting interval stage; in the signal transmitting stage, the electromagnetic resonance circuit is driven to continuously transmit magnetic field energy signals; in the transmission interval stage, suspending sending the magnetic field energy signal, and acquiring an attenuation signal sensed by a feedback signal processing circuit of the wireless power supply device; judging whether attenuation abnormality occurs according to the attenuation signals, if so, interrupting the transmission of the magnetic field energy signals.
Optionally, the step of determining whether attenuation abnormality occurs according to the attenuation signal includes: extracting a set attenuation section from the attenuation signal, wherein the attenuation section is a section from a preset first oscillation amplitude value to a preset second oscillation amplitude value of the attenuation signal; accumulating the obtained oscillation amplitude values in the attenuation section to obtain accumulated amplitude values; comprehensively calculating the accumulated amplitude and the resonance frequency of the magnetic field energy signal before the current transmission interval stage to obtain an attenuation evaluation value; and judging whether the attenuation evaluation value is smaller than a preset attenuation threshold value, if so, determining that attenuation abnormality occurs.
Optionally, the first oscillation amplitude is the amplitude of the magnetic field energy signal before the current transmission interval stage, the second oscillation amplitude is the product of the first oscillation amplitude and a preset proportion, wherein the value range of the preset proportion is 40% to 70%, and the method further comprises the following steps of interrupting the transmission of the magnetic field energy signal: and after the set interruption time, the electromagnetic resonance circuit is driven again to send a detection signal.
Optionally, before the step of driving the electromagnetic resonant circuit of the wireless power supply device to transmit the magnetic field energy signal according to a preset period, the method further comprises: driving an electromagnetic resonance circuit of the wireless power supply device to send a detection signal; acquiring sensing signals sensed by a feedback signal processing circuit of the wireless power supply device within a set time range after the detection signals are transmitted, and extracting signal characteristics of the sensing signals, wherein the signal characteristics comprise the peak value number of the sensing signals and time intervals among the peak values; judging whether the signal characteristics are consistent with the preset characteristics of feedback signals of the wireless power receiving device, wherein the characteristics of the feedback signals are set according to the feedback signals sent by the wireless power receiving device in response to the detection signals; if yes, the electromagnetic resonance circuit is driven to send a magnetic field energy signal so as to output electric energy.
Optionally, the wireless power receiving device is configured to send a feedback signal with two peaks to the wireless power supply device within a set time range after the detection signal is sensed, and time intervals of the two peaks of the feedback signal of the different kinds of wireless power receiving devices are set to be different; and is also provided with
The step of judging whether the signal characteristics are consistent with the preset characteristics of the feedback signal of the wireless power receiving device comprises the following steps: judging whether the number of the peaks of the sensing signals is two; if so, comparing the time intervals between the peaks of the sensing signals with the peak intervals of the feedback signals of the wireless power receiving devices of different types respectively; if the comparison results in the wireless power receiving device with the consistent time interval between the peak interval of the feedback signal and the peak of the sensing signal, the signal characteristic is determined to be consistent with the characteristic of the feedback signal of the wireless power receiving device.
Optionally, the step of driving the electromagnetic resonance circuit to transmit the magnetic field energy signal further comprises: the power receiving state signal sensed by the feedback signal processing circuit is acquired, and the power receiving state signal is generated by the wireless power receiving device according to power receiving voltage and power receiving current; analyzing the power receiving voltage and the power receiving current from the power receiving state signal; and adjusting the resonant frequency of the electromagnetic resonant circuit according to the power receiving voltage and the power receiving current to adjust the transmission power of the magnetic field energy signal.
Optionally, the step of adjusting the resonant frequency of the electromagnetic resonant circuit according to the power-on voltage and the power-on current includes: evaluating the load state of the wireless power receiving device according to the power receiving voltage; under the condition that the load state is overload, the resonance frequency of the electromagnetic resonance circuit is reduced according to the magnitude of the power receiving current, so that the transmission power of the magnetic field energy signal is improved; when the load state is underload, the resonance frequency of the electromagnetic resonance circuit is increased according to the magnitude of the power receiving current, so that the transmission power of the magnetic field energy signal is reduced.
Optionally, the step of resolving the power-on voltage and the power-on current from the power-on state signal includes: and judging whether the power receiving state signal can analyze the effective data.
Under the condition that effective data can be analyzed, analyzing to obtain power receiving voltage and power receiving current; judging whether the power receiving state signal contains data characteristics or not under the condition that effective data cannot be analyzed; under the condition that the power receiving state signal contains data characteristics, the resonance frequency of the electromagnetic resonance circuit is reduced so as to improve the transmission power of the magnetic field energy signal; under the condition that the power receiving state signal does not contain the data characteristic, the energy transmission is determined to be failed, the times of the energy transmission failure are accumulated, and when the accumulated times exceed a preset threshold value, the transmission of the magnetic field energy signal is interrupted.
The invention also provides a wireless power supply device, which comprises: an electromagnetic resonance circuit configured to convert an alternating current signal into a magnetic field signal; a feedback signal processing circuit configured to sense a signal received by the electromagnetic resonant circuit; and the power supply controller comprises a memory and a processor, wherein a power supply control program is stored in the memory, and the power supply control program is used for realizing any control method when being executed by the processor.
According to the wireless power supply device and the control method thereof, whether foreign matters exist in the magnetic field or not is judged by detecting the attenuation condition of the attenuation section set in the attenuation signal during the interval of transmitting the magnetic field energy signal, so that the safety is improved.
Further, in the wireless power supply device and the control method thereof according to the present invention, before wireless power supply is performed, a probe signal is first transmitted, and a wireless power receiving device is identified by a signal characteristic of a sensing signal received thereafter. The specific identification means is to acquire the sensing signal sensed by the feedback signal processing circuit within a set time range after the detection signal is transmitted, and determine whether the wireless power receiving device receives the detection signal by comparing the signal characteristic of the sensing signal with the characteristic of the preset feedback signal of the wireless power receiving device, and respond correctly. The identification means does not need to add additional communication hardware components, the identification process is simple and efficient, and the wireless powered device can be effectively identified.
Furthermore, the wireless power supply device and the control method thereof determine the wireless power receiving device through the time interval between the peaks in the feedback signal, and can further identify the type of the wireless power receiving device.
Furthermore, the wireless power supply device and the control method thereof further improve the communication flow for acquiring the power supply state of the wireless power receiving device, can timely know the power supply voltage and the power supply current of the wireless power receiving device, pertinently adjusts the transmission power of the magnetic field energy signal by adjusting the resonance frequency of the electromagnetic resonance circuit, meets the load requirement of the wireless power receiving device, and improves the power supply efficiency.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a circuit schematic of a wireless power supply according to one embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a wireless powered device for use with the wireless power supply device shown in FIG. 1;
FIG. 3 is a schematic block diagram of a power supply controller in a wireless power supply according to one embodiment of the invention;
FIG. 4 is a schematic block diagram of a power receiving controller in a wireless power receiving device according to one embodiment of the invention;
fig. 5 is a schematic diagram of a control method of a wireless power supply device according to an embodiment of the present invention;
fig. 6 is a schematic waveform diagram of a sensing signal in a control method of a wireless power supply device according to an embodiment of the present invention;
fig. 7 is a waveform diagram of a signal attenuated during a transmission interval in a control method of a wireless power supply apparatus according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of detecting attenuation in a control method of a wireless power supply device according to an embodiment of the present invention;
fig. 9 is a schematic waveform diagram of a data signal during transmission in a control method of a wireless power supply device according to an embodiment of the present invention;
fig. 10 is a schematic flow chart of adjusting power supply in a control method of a wireless power supply device according to an embodiment of the present invention; and
fig. 11 is a schematic diagram of a power receiving control method in cooperation with the control method of the wireless power supply apparatus 100 of the present embodiment.
Detailed Description
Fig. 1 is a circuit schematic diagram of a wireless power supply 100 according to one embodiment of the present invention. Fig. 2 is a schematic circuit diagram of a wireless power receiving device 200 used in cooperation with the wireless power supply device 100 shown in fig. 1. The wireless power supply apparatus 100 of the present embodiment may generally include: the power input interface 110, the power supply voltage measuring circuit 101, the linear step-down circuit 102, the power supply controller 103, the analog-to-digital conversion circuit 104, the power tube driving circuit 105, the power supply driving circuit 106, the electromagnetic resonance circuit 107, the coil voltage detection step-down circuit 108, and the feedback signal processing circuit 109 are as follows: an external power source (for example, a power frequency power source of alternating current 220) is supplied from the power input interface 110, and the power supply voltage measuring circuit 101 is configured to detect a power supply voltage by dividing the voltage; the linear step-down circuit 102 linearly steps down the power supply signal, the power supply controller 103 supplies a drive signal to the power tube drive circuit 105, the power tube drive circuit 105 drives the power supply drive circuit 106 to form a high-frequency alternating current signal, and the electromagnetic resonance circuit 107 resonates with the high-frequency alternating current signal to convert the magnetic field signal. The resonance signal generated by the electromagnetic resonance circuit 107 is subjected to voltage reduction and filtration by the coil voltage detection voltage reduction circuit 108, and then is converted into a digital signal by the analog-to-digital conversion circuit 104, so that feedback is provided for the power supply controller 103, and a closed-loop control loop is formed.
The wireless power receiving apparatus 200 may include: the power receiving resonance circuit 201, the signal transmitting circuit 202, the power receiving end voltage measuring circuit 203, the linear voltage reducing circuit 204, the circuit breaking protection circuit 205, the power receiving controller 206, the voltage stabilizing circuit 207, the rectifier bridge circuit 208 and the power output interface 209. The power receiving resonance circuit 201 obtains power receiving electric energy through electromagnetic induction, and after the electric signal is rectified by the rectifier bridge circuit 208, on one hand, the power receiving resonance circuit can provide power for the wireless power receiving device 200 (for example, power supply to the power receiving controller 206), and on the other hand, the power receiving resonance circuit can also provide electric energy to external loads through the power output interface 209. The open circuit protection circuit 205 is used to provide protection (e.g., open circuit in case of a short circuit or an over voltage), and the voltage stabilizing circuit 207 ensures that the output voltage is stable. The receiving end voltage measuring circuit 203 is used for measuring the receiving voltage, and the wireless receiving device 200 may be connected in series with a current detecting device (not shown) in the line for measuring the receiving current. The power receiving controller 206 may provide a modulation signal through the power receiving resonance circuit 201 by using the signal transmitting circuit 202 according to the power receiving state and other operation states to feed back the above states to the wireless power supply device 100.
The modulated signal fed back by the wireless power receiving apparatus 200 is processed (e.g., filtered, amplified, etc.) by the feedback signal processing circuit 109, and is converted into a digital signal by the analog-to-digital conversion circuit 104, so as to provide a feedback reply of the wireless power receiving apparatus 200 to the power supply controller 103.
The present embodiment mainly improves the control logic of the power supply controller 103 and the power receiving controller 206, and the interaction process of the wireless power supply device 100 and the wireless power receiving device 200, and compared with a wireless power supply system with an additional communication module, the present embodiment saves an additional bluetooth or infrared transmission module. The specific components and connection relationships of the above circuits are obvious to those skilled in the art from the above description of the functions, and will not be described herein.
Fig. 3 is a schematic block diagram of the power supply controller 103 in the wireless power supply apparatus 100 according to one embodiment of the present invention. Fig. 4 is a schematic block diagram of the power receiving controller 206 in the wireless power receiving apparatus 200 according to one embodiment of the invention. The power supply controller 103 of the wireless power supply device 100 may include a memory 120 and a processor 111, where the memory 120 stores a power supply control program 121, and the power supply control program 121 is used to implement the control method of the wireless power supply device 100 of the present embodiment when executed by the processor 111.
The power receiving controller 206 of the wireless power receiving device 200 may include a memory 220 and a processor 211, where the memory 220 stores a power receiving control program 221, and the power receiving control program 221 is used to implement a power receiving control method that matches the control method of the wireless power supply device 100 of the present embodiment when executed by the processor 211.
Fig. 5 is a schematic diagram of a control method of the wireless power supply apparatus 100 according to an embodiment of the present invention. The control method of the wireless power supply device 100 includes:
step S502, which is performed for the first time after the wireless power supply apparatus 100 completes initialization and is performed repeatedly periodically without identifying the wireless power receiving apparatus 200, of driving the electromagnetic resonance circuit 107 of the wireless power supply apparatus 100 to transmit a detection signal. For example, the wireless power supply device 100 drives the electromagnetic resonance circuit 107 to emit a detection signal once every 0.25 seconds (the specific interval time may be set, and 0.25 seconds is merely exemplified) while in the standby state. The detection signal is used to provide an identification instruction to the wireless power receiving apparatus 200, and may also provide the wireless power receiving apparatus 200 with energy to return a feedback signal in a standby state. Therefore, the detection signal is required to provide certain energy, and energy waste is required to be avoided as much as possible, for example, the detection signal can be set to 140khz, the emission time is 5ms, and the specific signal frequency and emission time can be adjusted within a certain range of the above exemplified values according to the need.
After transmitting the probe signal, if the matched wireless power receiving apparatus 200 receives the probe signal, the wireless power supply apparatus 100 may supply power to the power receiving controller 206 using the energy of the probe signal. After the power receiving controller 206 is started, the signal transmitting circuit 202 is used to transmit a feedback signal through the power receiving resonant circuit 201, where the feedback signal is in a form predetermined with the wireless power supply device 100, for example, the feedback signal may be two or more pulses, and an interval time when the transmission of the first pulse distance detection signal is completed and an interval time between the pulses are set according to the predetermined. That is, the wireless power receiving apparatus 200 may be configured to transmit a feedback signal having two peaks or more to the wireless power supply apparatus 100 within a set time range after sensing the detection signal.
In step S504, the sensing signal sensed by the feedback signal processing circuit 109 of the wireless power supply device 100 is acquired within the set time range after the transmission of the detection signal, and the signal characteristics of the sensing signal are extracted, wherein the signal characteristics include the number of peaks of the sensing signal and the time interval between the peaks.
The feedback signal of the wireless power receiving device 200 is coupled to the power receiving resonant circuit 201 and the electromagnetic resonant circuit 107, so that the signal received by the wireless power supply device 100 may be deformed, and the amplitude of the feedback signal may also be changed due to the change of the distance between the wireless power supply device 100 and the wireless power receiving device 200. Fig. 6 is a schematic waveform diagram of a sensing signal in a control method of the wireless power supply device 100 according to an embodiment of the present invention, where L1 is a feedback signal provided by the power receiving controller 206, and L2 is a sensing signal sensed by the feedback signal processing circuit 109, where two peaks of L2 correspond to pulse signals fed back by the wireless power receiving device 200. t1 reflects the time interval between the detection signal to the first peak and t2 reflects the time interval between the two peaks. In step S504, only the signals within the set time range after the transmission of the detection signal are identified, and the generation of interference waves in other periods can be avoided.
In specific implementation, two peaks or three peaks or more peaks can be selected for use, but in order to further improve efficiency, the embodiment preferably adopts a feedback signal with two peaks, and through practical tests, the two peaks can meet the requirement of feature comparison. The time intervals of the two peaks of the feedback signal of the different types of wireless power receiving apparatuses 200 may be set to be different, and the number of the two peaks of the feedback signal of the different types of wireless power receiving apparatuses 200 may be different.
Step S506, determining whether the signal characteristics are consistent with the characteristics of the feedback signal of the preset wireless power receiving device 200, and if the feedback signal has two peaks, determining whether the number of peaks of the sensing signal received within the set time range after the transmission of the detection signal is two; if so, comparing the time intervals between the peaks of the sensing signal with the peak intervals of the feedback signals of the different types of wireless power receiving devices 200, respectively; if the comparison yields that there is a wireless power receiving device 200 whose peak interval of the feedback signal coincides with the time interval between peaks of the sensing signal, it is determined that the signal characteristics coincide with the characteristics of the feedback signal of the wireless power receiving device 200.
For example, it is determined that the first peak is received between 2.5ms and 3ms after the detection signal is transmitted, and the interval between the two peaks is 1.5ms, which can be determined to be the first type of wireless power receiving device, the interval between the two peaks is 2ms, which can be determined to be the second type of wireless power receiving device, and so on, the respective types of wireless power receiving devices 200 are different in pitch. Therefore, in the case where the time intervals of the two peaks of the feedback signal of the wireless power receiving apparatus 200 of different kinds are set to be different, the kind of the wireless power receiving apparatus 200 can also be identified from the time interval between the peaks of the sensing signal; the magnetic field energy signal is output according to a signal transmission parameter corresponding to the type of the wireless power receiving apparatus 200.
In step S508, when it is determined that the signal characteristics match the characteristics of the feedback signal of the wireless power receiving apparatus 200 set in advance, the electromagnetic resonance circuit 107 is driven to transmit the magnetic field energy signal to output electric energy.
The above-described different types of wireless power receiving apparatuses 200 differ in power consumption required by the load, and thus the wireless power supply apparatus 100 may preset different initial signal transmission parameters (including an initial resonance frequency, a power supply period, and the like) for the different types of wireless power receiving apparatuses 200. The magnetic field energy signal transmitted by the driving electromagnetic resonance circuit 107 can be output according to the signal emission parameter corresponding to the type of the wireless power receiving device 200, so as to satisfy the power receiving requirements of different types of wireless power receiving devices 200.
In consideration of the possible energy loss and safety problems caused by the entry of sundries such as conductive objects into the magnetic field during the transmission of the magnetic field energy signal to output the electric energy, the control method of the wireless power supply device 100 of the embodiment further improves the foreign object detection flow.
The process of driving the electromagnetic resonance circuit 107 to transmit the magnetic field energy signal to output electric energy may drive the electromagnetic resonance circuit 107 to transmit the magnetic field energy signal according to a preset period, and the period may include a signal transmitting phase and a transmitting interval phase.
During the signal transmission phase, the electromagnetic resonant circuit 107 is driven to continuously transmit the magnetic field energy signal.
During the transmission interval period, suspending the transmission of the magnetic field energy signal and acquiring the attenuation signal sensed by the feedback signal processing circuit 109; judging whether attenuation abnormality occurs according to the attenuation signals, if so, interrupting the transmission of the magnetic field energy signals.
The judging whether attenuation abnormality occurs according to the attenuation signal may specifically include: extracting a set attenuation section from the attenuation signal, wherein the attenuation section is a section from a preset first oscillation amplitude value to a preset second oscillation amplitude value of the attenuation signal; accumulating the obtained oscillation amplitude values in the attenuation section to obtain accumulated amplitude values; comprehensively calculating the accumulated amplitude and the resonance frequency of the magnetic field energy signal before the current transmission interval stage to obtain an attenuation evaluation value; and judging whether the attenuation evaluation value is smaller than a preset attenuation threshold value, if so, determining that attenuation abnormality occurs.
The first oscillation amplitude is the amplitude of the magnetic field energy signal before the current transmission interval stage, the second oscillation amplitude is the product of the first oscillation amplitude and a preset proportion, wherein the value range of the preset proportion is 40-70%, and the method further comprises the following steps of interrupting the transmission of the magnetic field energy signal: after the set interruption time, the electromagnetic resonance circuit 107 of the wireless power supply device 100 is re-driven to transmit a detection signal. In order to improve the detection efficiency, the method of the embodiment is provided with an attenuation section, and a period of time for which the amplitude is attenuated to 40% to 70% (preferably 50% to 70%, for example, 50%, 55%, 65%, 70%, etc.) is used as the attenuation section (the section can more obviously reflect the attenuation characteristic) through a plurality of tests, so that the detection effect on the detection efficiency of the whole attenuation section is avoided.
Fig. 7 is a waveform diagram illustrating attenuation of a signal during a transmission interval in a control method of the wireless power supply apparatus 100 according to an embodiment of the present invention. Where L3 represents a magnetic field energy signal, which mainly shows a transmission interval phase, L4 shows an attenuation signal in a state where no foreign matter interference occurs, and L5 is an attenuation signal in a state where foreign matter interference occurs. It can be seen that the decay acceleration is evident in the presence of metallic foreign matter.
Fig. 8 is a flowchart illustrating a method for detecting attenuation in a control method of the wireless power supply apparatus 100 according to an embodiment of the present invention. The detection flow comprises the following steps:
in step S802, during the signal transmission phase, the electromagnetic resonance circuit 107 is driven to continuously transmit the magnetic field energy signal.
Step S804, after reaching the transmission interval phase, the transmission of the magnetic field energy signal is suspended.
In step S806, the oscillation amplitude is periodically acquired (the acquisition period may be selected to be 20 us), and the acquired value is stored in the register.
Step S808, judging whether the attenuation section is ended, namely judging whether the oscillation amplitude is smaller than or equal to the second oscillation amplitude (40% to 70% of the amplitude before attenuation);
in step S810, after the attenuation section is finished, that is, after the oscillation amplitude has been attenuated to the set proportion, the amplitude data in the register is accumulated to obtain an accumulated amplitude.
Step S812, comprehensively calculating the accumulated amplitude and the resonance frequency of the magnetic field energy signal before the current transmission interval stage to obtain an attenuation evaluation value; wherein the accumulated amplitude reflects the magnitude of the signal in combination with the resonant frequency to determine the degree of energy attenuation within the attenuation zone.
Step S814, it is determined whether the foreign matter affects the energy transmission by judging whether the attenuation evaluation value is smaller than a preset attenuation threshold. Wherein the decay threshold may be determined by a pre-test, which may reflect the size of the foreign object as well as the amount of energy consumed.
In step S816, if it is determined that the foreign matter affects the energy transmission, the detection signal is retransmitted after a set interruption time (e.g., set to 30S), that is, step S502 is re-performed.
The above procedure is performed by detecting in a specific attenuation section, without detecting and waiting for the end of the whole attenuation process. The attenuation section is creatively arranged by the inventor, and the size of the metal foreign matters and the influence of the metal foreign matters on the wireless power supply device 100 can be accurately represented in the attenuation section, so that the detection efficiency is greatly improved.
The control method of the present embodiment may further include, after the step of driving the electromagnetic resonance circuit 107 to transmit the magnetic field energy signal: acquiring a power receiving state signal sensed by the feedback signal processing circuit 109 of the wireless power supply device 100, wherein the power receiving state signal is generated by the wireless power receiving device 200 according to power receiving voltage and power receiving current modulation; analyzing the power receiving voltage and the power receiving current from the power receiving state signal; the resonant frequency of the electromagnetic resonant circuit 107 is adjusted according to the power receiving voltage and the power receiving current to adjust the transmission power of the magnetic field energy signal. The control method of the present embodiment also optimizes the data transmission process of the wireless power receiving apparatus 200 to meet the transmission requirements of the power receiving voltage and the power receiving current.
In the process of receiving electric energy, the wireless power receiving device 200 may collect the power receiving voltage and the power receiving current at intervals, convert the power receiving voltage and the power receiving current into binary codes, couple the converted binary codes to the power receiving resonant circuit 201 in a pulse mode through the signal sending circuit 202, feed back to the electromagnetic resonant circuit 107, and convert the binary codes into digital signals through the analog-to-digital conversion circuit 104 after the voltage is reduced and filtered by the coil voltage detection voltage reducing circuit 108, so as to provide the digital signals to the power supply controller 103.
The power receiving controller 206 distinguishes between data 0 and 1 according to the time difference of the adjacent two signals. The power receiving controller 206 converts the data to be transmitted into a binary code, first transmits the data frame header for 1.5ms, and then transmits binary data from the high order to the low order, with a binary 0 delay of 1ms and a binary 1 delay of 2ms. After the 8-bit data is transmitted, a function bit is transmitted, and the 8-bit data represents a power receiving voltage or a power receiving current, for example, the function bit is 0 to represent the voltage, and the function bit is 1 to represent the current. Finally, a fixed 1.5ms frame stop bit is sent. The specific delay is an example value, and can be adjusted according to the situation in the specific implementation process.
Fig. 9 is a schematic waveform diagram of a data signal during transmission in a control method of the wireless power supply apparatus 100 according to an embodiment of the present invention. In the figure, L6 represents a data signal of the power receiving controller 206; l7 represents a modulation signal output from the power receiving resonance circuit 201; l8 represents the modulated signal sensed by the electromagnetic resonant circuit 107; l9 represents a signal demodulated by the coil voltage detection step-down circuit 108, wherein the coordinate X axis represents time in ms and the coordinate Y axis represents signal amplitude in V; l10 represents the resulting reduction signal.
In waveform L10, st is a data frame header with an interval of 1.5ms (e.g., a numerical value), and b 0-b 7 are data items, where an interval of 1ms (e.g., a numerical value) represents 0 and an interval of 2ms (e.g., a numerical value) represents 1, i.e., 0, 1 are represented by a time interval. b8 is a functional bit, for example, a functional bit of 0 indicates a voltage and a functional bit of 1 indicates a current. The data analyzed by b0 to b8 shown in fig. 9 is 00001110.sp is a frame stop bit, which is spaced 1.5ms apart (e.g., a numerical value).
According to the power supply principle of the wireless power supply system, the power of the wireless power supply is related to the power supply voltage of the wireless power supply device 100 and the resonance frequency, and the power supply voltage affects the amplitude of the resonance signal. When the power supply voltage is unchanged, the power supply power can be effectively improved by reducing the resonance frequency of the electromagnetic resonance circuit 107, whereas the power supply power can be effectively reduced by increasing the resonance frequency of the electromagnetic resonance circuit 107. The output power of the wireless power supply apparatus 100 may be automatically adjusted by the power receiving voltage fed back by the wireless power receiving apparatus 200.
The specific process of adjusting the power supply power can be as follows: evaluating a load state of the wireless power receiving apparatus 200 according to the power receiving voltage; in the case that the load state is overload, the resonance frequency of the electromagnetic resonance circuit 107 is reduced according to the magnitude of the power receiving current, so as to improve the transmission power of the magnetic field energy signal; when the load state is underloaded, the resonance frequency of the electromagnetic resonance circuit 107 is increased according to the magnitude of the power receiving current, so that the transmission power of the magnetic field energy signal is reduced. The step of analyzing the power receiving voltage and the power receiving current by the power receiving state signal may include: and judging whether the power receiving state signal can analyze the effective data. Under the condition that effective data can be analyzed, analyzing to obtain power receiving voltage and power receiving current; judging whether the power receiving state signal contains data characteristics or not under the condition that effective data cannot be analyzed; in the case where the power-on state signal contains data features, the resonance frequency of the electromagnetic resonance circuit 107 is lowered to increase the transmission power of the magnetic field energy signal; under the condition that the power receiving state signal does not contain the data characteristic, the energy transmission is determined to be failed, the times of the energy transmission failure are accumulated, and when the accumulated times exceed a preset threshold value, the transmission of the magnetic field energy signal is interrupted.
Fig. 10 is a flowchart illustrating a method for controlling the wireless power supply apparatus 100 according to an embodiment of the present invention. The process of adjusting the power supply may include:
step S1002, driving the electromagnetic resonance circuit 107 to transmit a magnetic field energy signal;
step S1004, acquiring a power receiving status signal fed back by the wireless power receiving device 200;
step S1006, judging whether the power receiving state signal can analyze the effective data;
step S1008, when the valid data can be analyzed, analyzing to obtain the power receiving voltage and the power receiving current;
step S1010, the load state of the wireless power receiving device 200 is evaluated according to the power receiving voltage, where the evaluation process may be to determine whether the power supply voltage of the wireless power supply device 100 is greater than the power receiving voltage, if the power supply voltage is greater than the power receiving voltage, the load is considered to be overloaded, the output power is insufficient, and if the power supply voltage is less than the power receiving voltage, the load is considered to be underloaded, and the output power is too high;
step S1012, in the case that the load state is overload, reducing the resonant frequency of the electromagnetic resonant circuit 107 according to the magnitude of the power receiving current to increase the transmission power of the magnetic field energy signal; the amplitude of the decrease of the resonant frequency can be calculated according to the magnitude of the power receiving current, namely, the target value of the resonant frequency is calculated by utilizing the power receiving current, and in the specific adjusting process, the resonant frequency can be gradually made to be close to the target value by adopting stepped adjustment.
Step S1014, when the load state is underload, increasing the resonant frequency of the electromagnetic resonant circuit 107 according to the magnitude of the power receiving current to reduce the transmission power of the magnetic field energy signal; the amplitude of the increase of the resonant frequency can be calculated according to the magnitude of the power receiving current, namely, the target value of the resonant frequency is calculated by utilizing the power receiving current, and in the specific adjusting process, the resonant frequency can be gradually made to be close to the target value by adopting stepped adjustment.
Step S1016, in the case that the valid data cannot be analyzed, determining whether the power receiving status signal includes a data feature, where the data feature may be a signal that can determine that the power receiving status signal is a rule-compliant signal sent by the wireless power receiving device 200, but the valid data cannot be analyzed due to insufficient clarity; in the case where the power receiving status signal includes the data feature, the possible reason is that the output power is insufficient, resulting in insufficient feedback of the wireless power receiving apparatus 200, the resonant frequency of the electromagnetic resonant circuit 107 is reduced to increase the transmission power of the magnetic field energy signal;
in step S1018, if the power receiving status signal does not include the data feature, it may be determined that the power transmission has failed or the wireless power receiving apparatus 200 has failed to feed back, and the number of times of the power transmission failure may be accumulated, and the power receiving status signal may be acquired again.
In step S1020, it is determined whether the accumulated number exceeds a preset threshold.
In step S1022, if the accumulated number exceeds the preset threshold, the detection signal is retransmitted after the set interruption time (e.g., set to 30S), that is, step S502 is performed again.
The wireless power receiving apparatus 200 is used in cooperation with the wireless power feeding apparatus 100, and the power receiving control program 221 can execute a power receiving control method in cooperation with the control method of the wireless power feeding apparatus 100 of the present embodiment. Fig. 11 is a schematic diagram of a power receiving control method in cooperation with the control method of the wireless power supply apparatus 100 of the present embodiment. The wireless power receiving apparatus 200 may perform the following steps in the power receiving process:
step S1102, acquiring a detection signal, and initializing the power receiving controller 206 by using the detection signal to receive power;
step S1104 of transmitting a feedback signal in response to the probe signal in a predetermined form;
step S1106, detecting whether the wireless power supply device 100 has stably outputted electric power, which can be judged by the measured voltage value of the power receiving end voltage measuring circuit 203, and if the wireless power supply device has not stably outputted electric power, repeating to send a feedback signal in response to the detection signal in a predetermined form;
step S1108, if the wireless power supply device has stably output electric energy, that is, after determining that the electric energy can meet the requirement of supplying load, entering a power receiving mode, starting the open circuit protection circuit 205, and starting the voltage stabilizing circuit 207 to operate;
step S1110, closing a load switch to start supplying power to a load;
step S1112, detecting a power receiving voltage and a power receiving current;
step S1114, determining whether the power receiving voltage is abnormal, that is, determining whether the power receiving voltage exceeds a set power receiving voltage threshold range;
step S1116, if the power receiving voltage is abnormal, interrupting the power supply to the load, waiting for the wireless power supply device 100 to recover to a normal state;
in step S1118, a power receiving status signal is provided to the wireless power supply device, and the wireless power supply device 100 waits for the output power to be adjusted.
By the cooperation of the wireless power receiving apparatus 200 and the wireless power feeding apparatus 100, the wireless power feeding process can be completed together with high efficiency.
The wireless power supply apparatus 100 and the control method thereof according to the present embodiment first transmit a probe signal before wireless power supply, and identify the wireless power receiving apparatus 200 by the signal characteristics of the sensing signal received thereafter. Because the wireless powered device 200 is determined by the time interval between the peaks in the feedback signal, the identification efficiency is greatly improved, the type of the wireless powered device 200 can be further identified, and compared with the existing identification process, the anti-interference capability is greatly improved, and the identification efficiency and accuracy are also greatly improved.
During the interval of transmitting the magnetic field energy signal, whether foreign matters exist in the magnetic field or not is judged by detecting the attenuation condition of the attenuation section set in the attenuation signal, so that the safety is improved.
By improving the communication flow of acquiring the power supply state of the wireless power receiving device 200, the wireless power supply device 100 and the control method thereof of the embodiment can timely know the power supply voltage and the power supply current of the wireless power receiving device 200, and can specifically adjust the transmission power of the magnetic field energy signal by adjusting the resonance frequency of the electromagnetic resonance circuit 107, thereby meeting the load requirement of the wireless power receiving device 200 and improving the power supply efficiency.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (9)
1. A control method of a wireless power supply device, comprising:
the electromagnetic resonance circuit of the wireless power supply device is driven to send magnetic field energy signals according to a preset period, and the period comprises the following steps: a signal transmitting stage and a transmitting interval stage;
in the signal transmitting stage, driving the electromagnetic resonance circuit to continuously transmit the magnetic field energy signal;
suspending sending the magnetic field energy signal in the transmission interval stage, and acquiring an attenuation signal sensed by a feedback signal processing circuit of the wireless power supply device; judging whether attenuation abnormality occurs according to the attenuation signal, if so, interrupting the transmission of the magnetic field energy signal, wherein,
the step of judging whether attenuation abnormality occurs according to the attenuation signal comprises the following steps:
extracting a set attenuation section from the attenuation signal, wherein the attenuation section is a section from a preset first oscillation amplitude to a preset second oscillation amplitude of the attenuation signal, the first oscillation amplitude is the amplitude of the magnetic field energy signal before the current transmission interval stage, the second oscillation amplitude is the product of the first oscillation amplitude and a preset proportion, and the value of the preset proportion ranges from 40% to 70%;
accumulating the obtained oscillation amplitude values in the attenuation section to obtain accumulated amplitude values;
comprehensively calculating the accumulated amplitude and the resonance frequency of the magnetic field energy signal before the current transmission interval stage to obtain an attenuation evaluation value;
and judging whether the attenuation evaluation value is smaller than a preset attenuation threshold value, if so, determining that the attenuation abnormality occurs.
2. The control method of a wireless power supply apparatus according to claim 1, wherein,
after the step of interrupting the transmission of the magnetic field energy signal, further comprises: and after the set interruption time, the electromagnetic resonance circuit is driven again to send a detection signal.
3. The control method of a wireless power supply apparatus according to claim 1, wherein before the step of driving the electromagnetic resonance circuit of the wireless power supply apparatus to transmit the magnetic field energy signal at a preset period, further comprising:
driving the electromagnetic resonance circuit to send a detection signal;
acquiring a sensing signal sensed by the feedback signal processing circuit in a set time range after the detection signal is transmitted, and extracting signal characteristics of the sensing signal, wherein the signal characteristics comprise the number of peaks of the sensing signal and time intervals among the peaks;
judging whether the signal characteristics are consistent with the preset characteristics of feedback signals of the wireless power receiving device or not, wherein the characteristics of the feedback signals are set according to the feedback signals sent by the wireless power receiving device in response to the detection signals;
if yes, the electromagnetic resonance circuit is driven to send a magnetic field energy signal so as to output electric energy.
4. The control method of a wireless power supply apparatus according to claim 3, wherein,
the wireless power receiving device is configured to transmit the feedback signal having two peaks to the wireless power supply device within the set time range after the detection signal is sensed, and time intervals of the two peaks of the feedback signal of the wireless power receiving device of different kinds are set to be different; and is also provided with
The step of determining whether the signal characteristics are consistent with the preset characteristics of the feedback signal of the wireless power receiving device includes:
judging whether the number of the peaks of the sensing signals is two or not;
if yes, comparing the time intervals between the peaks of the sensing signals with the peak intervals of the feedback signals of the wireless power receiving devices of different types respectively;
and if the comparison shows that the wireless power receiving device with the consistent time interval between the peak value interval of the feedback signal and the peak value of the sensing signal exists, determining that the signal characteristic is consistent with the characteristic of the feedback signal of the wireless power receiving device.
5. The control method of a wireless power supply device according to claim 4, wherein the step of driving the electromagnetic resonance circuit to transmit the magnetic field energy signal includes:
identifying the type of the wireless power receiving device according to the time interval between the peaks of the sensing signal;
and outputting the magnetic field energy signal according to a signal transmission parameter corresponding to the type of the wireless power receiving device.
6. The control method of a wireless power supply apparatus according to claim 1, wherein the step of driving the electromagnetic resonance circuit of the wireless power supply apparatus to transmit the magnetic field energy signal in a preset period further comprises:
the power receiving state signals sensed by the feedback signal processing circuit are acquired, and the power receiving state signals are generated by the wireless power receiving device according to power receiving voltage and power receiving current modulation;
analyzing the power receiving voltage and the power receiving current from the power receiving state signal;
and adjusting the resonance frequency of the electromagnetic resonance circuit according to the power receiving voltage and the power receiving current so as to adjust the transmission power of the magnetic field energy signal.
7. The control method of a wireless power supply device according to claim 6, wherein the step of adjusting the resonance frequency of the electromagnetic resonance circuit according to the power receiving voltage and the power receiving current includes:
evaluating a load state of the wireless power receiving device according to the power receiving voltage;
under the condition that the load state is overload, the resonance frequency of the electromagnetic resonance circuit is reduced according to the magnitude of the power receiving current so as to improve the transmission power of the magnetic field energy signal;
when the load state is underload, the resonance frequency of the electromagnetic resonance circuit is increased according to the magnitude of the power receiving current so as to reduce the transmission power of the magnetic field energy signal.
8. The control method of a wireless power supply device according to claim 6, wherein the step of resolving the power receiving voltage and the power receiving current from the power receiving state signal includes:
judging whether the power receiving state signal can analyze effective data or not;
under the condition that the effective data can be analyzed, the power receiving voltage and the power receiving current are obtained through analysis;
judging whether the power receiving state signal contains data characteristics or not under the condition that the effective data cannot be analyzed;
reducing the resonant frequency of the electromagnetic resonant circuit to increase the transmit power of the magnetic field energy signal if the power-on state signal includes the data characteristic;
and under the condition that the power receiving state signal does not contain the data characteristics, determining that energy transmission fails, accumulating the times of the energy transmission failure, and interrupting the transmission of the magnetic field energy signal when the accumulated times exceed a preset threshold value.
9. A wireless power supply apparatus, comprising:
an electromagnetic resonance circuit configured to convert an alternating current signal into a magnetic field signal;
a feedback signal processing circuit configured to sense a signal received by the electromagnetic resonant circuit; and
a power supply controller comprising a memory and a processor, the memory having stored therein a power supply control program which, when executed by the processor, is adapted to carry out the control method according to any one of claims 1-8.
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