CN113131629B - Wireless charging device and detection module thereof - Google Patents
Wireless charging device and detection module thereof Download PDFInfo
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- CN113131629B CN113131629B CN201911407755.2A CN201911407755A CN113131629B CN 113131629 B CN113131629 B CN 113131629B CN 201911407755 A CN201911407755 A CN 201911407755A CN 113131629 B CN113131629 B CN 113131629B
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- 238000000034 method Methods 0.000 description 9
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Classifications
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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
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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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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- Electromagnetism (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a wireless charging device and a detection module thereof, wherein the detection module is used for detecting whether foreign matters exist or not and comprises the following components: a frequency controller providing an adjustment signal; an adjustable frequency generator that receives the adjustment signal from the frequency controller and generates a desired frequency sweep signal based on the adjustment signal; the transmitting antenna is used for transmitting the sweep frequency signal to acquire an antenna signal and generating a state signal according to an acquisition result; and the adjustable foreign matter characteristic detector is used for carrying out logic analysis on the acquisition result information of the state signal in the difference value range between the frequency spectrum range of the sweep frequency signal and the frequency range of the current antenna, outputting a corresponding analysis result and generating an indication signal according to the analysis result. The invention analyzes the frequency spectrum range of the return state of the transmitting antenna to detect whether foreign matters exist, has good adaptability, can omit a special chip and simplifies the system structure.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging device and a detection module thereof.
Background
Wireless charging technology is technology that transfers electrical energy from a power supply device to a powered device in a wireless transmission manner. Because no physical plug or cable connection is needed, the electric equipment adopting the wireless charging technology has the advantage of convenient and safe charging. Power supply devices and consumers that employ wireless charging technology are also referred to as contactless energy transfer devices. For example, wireless charging technology has been widely used in mobile terminals such as cellular phones.
However, the various power supply apparatuses respectively employ different power transmission modes, such as electromagnetic induction, radio waves, magnetic resonance, and the like, and the various power supply apparatuses respectively support different wireless charging standards, such as Qi standard, A4WP standard, in ofi technology, wi-Po technology. For the electric equipment, only the corresponding wireless charging standard is supported to be matched with the power supply equipment to acquire electric energy. The existing power supply equipment and electric equipment adopt special chips supporting at least one protocol and are also provided with corresponding receiving antennas and transmitting antennas so as to detect whether foreign matters with characteristics similar to those of the receiving antennas exist at the transmitting antennas.
The use of wireless charged dedicated chips in power supply and consumer devices results in complex circuit structures, but also in only a limited type of predetermined protocol, and dedicated receiving and transmitting antennas also result in increased device size.
Accordingly, there is a need to provide an improved solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wireless charging device and a detection module thereof, which are used for analyzing the frequency spectrum range of the return state of a transmitting antenna to detect whether foreign matters exist, have good adaptability, can omit a special chip and simplify the system structure.
According to the detection module of the wireless charging device provided by the invention, the detection module is used for detecting whether foreign matters exist or not and comprises the following components: a frequency controller providing an adjustment signal; an adjustable frequency generator that receives the adjustment signal from the frequency controller and generates a desired frequency sweep signal based on the adjustment signal; the transmitting antenna is used for transmitting the sweep frequency signal to acquire an antenna signal and generating a state signal according to an acquisition result; and the adjustable foreign matter characteristic detector is used for carrying out logic analysis on the acquisition result information of the state signal in the difference value range between the frequency spectrum range of the sweep frequency signal and the frequency range of the current antenna, outputting a corresponding analysis result and generating an indication signal according to the analysis result.
Preferably, the frequency spectrum range of the frequency sweep signal generated by the tunable frequency generator is larger than the frequency sweep frequency spectrum range corresponding to the current antenna.
Preferably, the method further comprises: and the power amplifier is connected with the adjustable frequency generator and is used for amplifying the sweep frequency signal and outputting the amplified sweep frequency signal to the transmitting antenna.
Preferably, the method further comprises: and the state detector is used for receiving the state signal from the transmitting antenna, filtering and analyzing the state signal to generate an analysis signal, and analyzing the analysis signal to represent the acquisition result of the antenna signal.
Preferably, the method further comprises: and the indicator is connected with the adjustable foreign matter characteristic detector, receives the analysis result and displays the analysis result.
Preferably, the sweep frequency range of the current antenna is a logic analysis range of the adjustable foreign matter characteristic detector, and the logic analysis range of the adjustable foreign matter characteristic detector is adjustable.
Preferably, the adjustable foreign matter characteristic detector includes: a first frequency signal generating unit that generates a frequency signal having a first threshold frequency; and the second frequency signal generating unit is used for generating a frequency signal with a second threshold frequency, and adjusting the first threshold frequency and/or the second threshold frequency to adjust the logic analysis range of the adjustable foreign matter characteristic detector.
According to the present invention, there is provided a wireless charging device comprising: an oscillator for generating a frequency signal; the power amplifier is connected with the oscillator and used for amplifying the frequency signal; the first antenna is connected with the power amplifier through the first matching network, and converts the frequency signal into a radiation field so as to transmit electric energy; the detection module is connected with the first antenna, generates a sweep frequency signal to collect an antenna signal, detects whether foreign matters exist at the first antenna according to a collection result, and generates a corresponding indication signal according to the detection result; the control module is connected with the detection module to obtain the indication signal, is connected with at least one of the oscillator, the power amplifier and the first matching network, and provides corresponding control signals according to the indication signal.
Preferably, the detection module shares a power amplifier and a first antenna in the wireless charging device, and the detection module amplifies the sweep signal according to the power amplifier and transmits the amplified sweep signal according to the first antenna.
Preferably, the wireless charging device is in one of a transmit and idle mode.
Preferably, when the detection module collects the antenna signal and detects that no foreign object exists at the first antenna, the wireless charging device is in a transmitting mode, and electric energy is transmitted through the first antenna.
Preferably, when the detection module does not collect the antenna signal, the wireless charging device is in an idle mode, and the wireless charging device stops transmitting the electric energy.
Preferably, when the detection module collects the antenna signal and detects that the foreign matter exists at the first antenna, the wireless charging device is in an idle mode, and the wireless charging device stops transmitting the electric energy.
Preferably, the wireless charging device further includes: and the memory is used for storing a reference frequency spectrum range, and the detection module generates a frequency sweeping signal according to the reference frequency spectrum range.
Preferably, the frequency spectrum range of the frequency sweep signal is greater than the reference frequency spectrum range.
The beneficial effects of the invention are as follows: the invention discloses a wireless charging device and a detection module thereof, wherein a sweep frequency signal is generated to collect an antenna signal, and then whether foreign matters exist at a transmitting antenna or not is judged according to the collection result of the antenna signal in the range of the difference between the frequency spectrum range of the sweep frequency signal and the frequency sweep range of the current antenna.
And the antenna state signals containing the acquisition result are filtered, so that interference signals in the state signals are filtered, and the processing efficiency is improved.
The threshold frequency of the frequency signal generated by the adjustable foreign matter characteristic detector is adjusted, so that the logic analysis range of the foreign matter characteristic detector can be adjusted to meet the requirements of antennas of different mounting structures, whether the transmitting antenna has a foreign matter similar to the receiving antenna or not is effectively detected, and the applicability of the detection module is improved.
The indicator is adopted to display the analysis result, so that the user can observe conveniently.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic block diagram of a wireless charging system according to the prior art;
fig. 2 shows a schematic block diagram of a wireless charging system according to an embodiment of the invention;
fig. 3 shows a detailed block diagram of a detection module in a wireless charging device according to an embodiment of the invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a schematic block diagram of a wireless charging system according to the prior art. Wireless charging system 100 includes a power supply 110 and a powered device 120 between which electrical energy is transferred by radio waves.
The power supply device 110 generates a radiation field for providing energy transfer in a transmission mode. Consumer 120 is coupled to a radiated field, captures electromagnetic energy from the radiated field and generates a charging current to charge battery 131. Power supply 110 is spaced apart from both powered device 120. In this embodiment, power supply device 110 and powered device 120 are configured according to a mutual resonant relationship. When the resonant frequency of powered device 120 is very close to the resonant frequency of powered device 110, the power transfer loss between powered device 110 and powered device 120 is minimal when powered device 120 is positioned in the "near field" of the radiated field.
Power supply 110 also includes an antenna 116 for providing a means for power transmission, and powered device 120 also includes an antenna 126 for providing a means for power reception. Parameters of antennas 116 and 126 are set according to the application and the device to be associated therewith. The transfer of power from power supply 110 to powered device 120 is related to the coupling efficiency of antennas 116 and 126, coupling most of the energy in the near field of antenna 116 into antenna 126, rather than propagating most of the energy in the form of electromagnetic waves to the far field. The area around antenna 116 and antenna 126 where this near field coupling may occur is referred to as the coupling-mode region.
The power supply device 110 further comprises an oscillator 111, a power amplifier 112, and a matching network 113. The oscillator 111 is, for example, a voltage-controlled oscillator, and generates a frequency signal of a desired frequency based on the frequency control signal. The power amplifier 112 amplifies the frequency signal and provides it to the antenna 116 via the matching network 113 to generate a radiation field. The matching network 113 is used to match the impedance of the power supply device 110 to the antenna 116.
Powered device 120 also includes matching network 121 and rectifier 122. Matching network 121 is used to match the impedance of powered device 120 to antenna 126. Rectifier 122 converts the electrical energy received via antenna 126 into a dc output voltage, charges battery 131, or directly powers the circuit module of the powered device.
In wireless charging system 100 according to the prior art, powered device 120 and powered device 110 may communicate over separate communication channels (e.g., bluetooth, zigbee, cellular, etc.) to conform to the data communication requirements of the associated protocol.
Fig. 2 shows a schematic block diagram of a wireless charging system according to an embodiment of the invention. Wireless charging system 200 includes a power supply 210 and a powered device 220, where power supply 210 is spaced apart from powered device 220 by a radio wave to transmit power and data therebetween.
The power supply device 210 generates a frequency sweep signal for detecting the receiving antenna in a detection state, and generates an indication signal for characterizing the detection result according to the detection result of the frequency sweep signal. And then judging whether to enter a transmission mode according to the indication signal.
In this embodiment, when the receiving antenna is detected by using the sweep frequency signal, the sweep frequency signal is adopted to collect the antenna signal in a spectrum range with a certain width, so as to determine whether the receiving antenna exists according to the collection result. Furthermore, when a foreign matter similar to the receiving antenna exists at the transmitting antenna, the frequency sweeping signal will also collect the antenna signal, but the frequency spectrum range corresponding to the frequency sweeping signal when the antenna signal corresponding to the foreign matter is collected is obviously larger than the frequency spectrum range corresponding to the frequency sweeping signal when the antenna signal corresponding to the receiving antenna is collected. The present invention is based on this principle for foreign matter detection.
When the presence of a receiving antenna is detected, the power supply device 210 enters a transmission mode. The power supply device 210 generates a radiation field for providing energy transfer in a transmission mode. Consumer 220 is coupled to a radiated field, captures electromagnetic energy from the radiated field and generates a charging current to charge battery 131. Power supply 210 is spaced apart from both powered device 220. In this embodiment, power supply device 210 and powered device 220 are configured according to a mutual resonant relationship. When the resonant frequency of powered device 220 is very close to the resonant frequency of powered device 210, the power transfer loss between powered device 210 and powered device 220 is minimal when powered device 220 is positioned in the "near field" of the radiated field.
Power supply 210 also includes antenna 116 for providing means for power transmission, and powered device 220 also includes antenna 126 for providing means for power reception. Parameters of antennas 116 and 126 are set according to the application and the device to be associated therewith. The transfer of power from power supply device 210 to powered device 220 is related to the coupling efficiency of antennas 116 and 126, coupling most of the energy in the near field of antenna 116 into antenna 126, rather than propagating most of the energy in the form of electromagnetic waves to the far field. The area around antenna 116 and antenna 126 where this near field coupling may occur is referred to as the coupling-mode region.
The power supply device 210 further includes an oscillator 111, a power amplifier 112, a matching network 113, a control module 114, and a detection module 115. The oscillator 111 is, for example, a voltage-controlled oscillator, and generates a desired frequency signal based on a frequency control signal. The power amplifier 112 amplifies the frequency signal and provides it to the antenna 116 via the matching network 113 to generate a radiation field. The matching network 113 is used to match the impedance of the power supply device 210 to the antenna 116. The detection module 115 is connected to the antenna 116, and is configured to generate a sweep signal to collect an antenna signal, detect whether a foreign object exists at the antenna 116 according to a collection result, and generate a corresponding indication signal according to a detection result. The control module 114 is connected to the detection module 115, receives the indication signal from the detection module 115, and generates control signals required by at least one of the oscillator 111, the power amplifier 112 and the matching network 113 according to the indication signal.
The required frequency and time of sweep are different due to the different mounting structures of the transmit antenna and the receive antenna. The detection module 115 generates swept frequency signals having different swept frequency ranges and sweep times according to the different mounting structures of the current antenna.
Further, the frequency spectrum range of the frequency sweep signal generated by the detection module 115 is larger than the frequency sweep frequency spectrum range corresponding to the installation structure of the current antenna.
Further, when the indication signal indicates that there is no receiving antenna or a foreign object similar to the receiving antenna (i.e. the sweep signal does not collect the antenna signal or collects the antenna signal but detects that there is a foreign object similar to the receiving antenna), the control module 114 controls the oscillator 111 to generate a frequency signal with a frequency of 0 according to the indication signal, i.e. the power supply device 210 is in the idle mode at this time, and does not perform power transmission. When the indication signal indicates that the receiving antenna exists (i.e. the sweep signal collects the antenna signal) but no foreign matter similar to the receiving antenna exists, the control module 114 controls the oscillator 111 to generate a frequency signal for data transmission or power transmission according to the indication signal, and the power supply device 210 enters a transmitting mode to transmit power via the antenna 116. Meanwhile, when the indication signal indicates that the foreign object similar to the receiving antenna exists, the control module 114 controls the oscillator 111 to generate a frequency signal with a frequency of 0 according to the indication signal, the power supply device 210 does not perform power transmission, and the detection module 115 prompts the user to remove the foreign object and re-performs the foreign object detection after the foreign object is removed.
In one embodiment of the present invention, the power supply device 210 further includes a memory in which reference spectrum ranges corresponding to antennas of different mounting structures are stored. The detection module 115 may obtain the reference spectrum range from the memory to generate a frequency sweep signal with a wider spectrum range according to the reference spectrum range for foreign object detection. Therefore, the automatic detection of the antennas with different mounting structures can be realized, the selection of the frequency spectrum range is not needed to be performed manually, and the detection efficiency and accuracy are improved.
The reference spectrum range is a frequency spectrum range of a frequency sweep required for detecting antennas with different mounting structures, and is known data.
Powered device 220 also includes matching network 121, rectifier 122, and configuration module 123. Matching network 121 is used to match the impedance of powered device 220 to antenna 126. Rectifier 122 converts the electrical energy received via antenna 126 into a dc output voltage, charges battery 131, or directly powers the circuit module of the powered device. The configuration module 123 is connected to the antenna 126 and modulates the configuration data into a data signal, which is transmitted via the antenna 126 to the power supply device 210.
In a wireless charging device, antenna 116 has both power transfer and data communication functions. In the transmission mode, the wireless charging device transmits radio waves of an operating frequency via the antenna 116 to transmit electric power, and receives radio waves of a communication frequency via the antenna 116 to receive data signals. The wireless charging device is, for example, a power supply device 210 in the wireless charging system 200.
In this embodiment, the detection module performs foreign matter detection by generating sweep signals with different sweep frequencies (spectrum ranges) and sweep times, so as to quickly and accurately detect whether a foreign matter exists or not or receive an antenna, and the functionality is stronger. Therefore, no wireless charging chip is needed, no communication protocol is needed, and the cost is reduced.
Fig. 3 shows a detailed block diagram of a detection module in a wireless charging device according to an embodiment of the invention. The wireless charging device is, for example, a power supply device in the wireless charging system shown in fig. 2.
The detection module 115 includes a frequency controller 11, an adjustable frequency generator 12, a power amplifier 13, a transmitting antenna 14, a state detector 15, a foreign matter possible characteristic detector 16, and an indicator 17. The detection module 115 generates a sweep frequency signal with a certain frequency spectrum range to collect an antenna signal, and further controls the working state of the wireless charging device according to whether a foreign object exists at the detection antenna 116 and a corresponding indication signal according to the detection result.
Wherein the frequency controller 11 generates the adjustment signal according to the frequency spectrum range of the frequency sweep signal. The frequency spectrum range of the sweep frequency signal is larger than the frequency spectrum range of the sweep frequency corresponding to the current antenna installation structure.
The frequency controller 11 determines the sweep frequency range and the sweep time of the sweep signal.
The adjustable frequency generator 12 is connected to the frequency controller 11 and receives the adjustment signal to generate a desired frequency sweep signal based on the adjustment signal. The adjustment signal controls the frequency generated by the adjustable frequency generator 12 to vary in a sequence over the frequency spectrum to thereby generate a swept frequency signal.
The power amplifier 13 is connected to the adjustable frequency generator 12 for power amplifying the frequency sweep signal.
The transmitting antenna 14 is connected with the power amplifier 13, transmits the sweep frequency signal after power amplification to collect the antenna signal, and generates a status signal according to the collection result, wherein the status signal contains the collection result information.
The state detector 15 is connected to the transmitting antenna 14, receives the state signal, and performs filtering analysis on the state signal to generate an analysis signal. The state detector 15 filters out the interference signals in the state signals, only retains the analysis signals representing the acquisition result of the antenna signals, and improves the processing efficiency.
The adjustable foreign matter characteristic detector 16 logically analyzes the acquired result information of the state signal (or the analysis signal) within the difference range between the frequency spectrum range of the frequency sweep signal generated by the adjustable frequency generator 12 and the frequency sweep frequency range of the current antenna, and outputs a corresponding analysis result. The sweep frequency range of the current antenna is the logic analysis range of the adjustable foreign object characteristic detector 16. In the present embodiment, the logic analysis range of the adjustable foreign matter characteristic detector 16 is adjustable.
The adjustable foreign matter characteristic detector 16 includes a first frequency signal generation unit configured to generate a frequency signal having a first threshold frequency, and a second frequency signal generation unit; the second frequency signal generating unit is used for generating a frequency signal with a second threshold frequency. The adjustable foreign matter characteristic detector 16 logically analyzes the acquired result information in the status signal or the analysis signal in a frequency range corresponding to the first threshold frequency and the second threshold frequency to determine whether a receiving antenna or a foreign matter having a proximity to the receiving antenna is present. If the acquired result information of the state signal (or the analysis signal) in the difference range between the frequency spectrum range of the frequency sweep signal generated by the adjustable frequency generator 12 and the frequency sweep frequency range of the current antenna is logically analyzed, judging whether the acquired signal representing the acquired antenna signal still exists in the difference range of the frequency spectrum range and the frequency sweep frequency range, if so, indicating that a foreign matter similar to the receiving antenna exists at the transmitting antenna of the wireless charging device; if not, it means that there is no foreign matter at the transmitting antenna of the wireless charging device that has proximity to the receiving antenna.
Accordingly, if the analysis signal indicates that the antenna signal is detected in the frequency spectrum range of the sweep signal, it directly indicates that no foreign matter similar to the receiving antenna exists at the transmitting antenna of the wireless charging device.
The adjustable foreign matter characteristic detector 16 is further configured to generate an indication signal according to the analysis result, where the indication signal is used to receive the presence of the antenna, so as to further control the wireless charging device to operate in a state.
The required frequency and time of sweep are different due to the different transmit antennas and antenna mounting structures, and the required logic analysis range is also different. At this time, by adjusting the threshold frequency of the frequency signal generated by the adjustable foreign object characteristic detector 16, the adjustment of the logic analysis range of the foreign object characteristic detector 16 can be realized, so as to meet the antennas with different mounting structures, effectively detect whether the foreign object having the similarity with the receiving antenna exists at the transmitting antenna, and improve the applicability of the detection module 115. The logic analysis range of the adjustable foreign matter characteristic detector 16 is the frequency spectrum range corresponding to the current antenna installation structure in the wireless charging device.
The indicator 17 is connected to the adjustable foreign matter characteristic detector 16, receives the analysis result and displays the analysis result. The indicator 17 may be convenient for the user to observe.
In one embodiment of the present invention, the power amplifier 13 and the transmitting antenna 14 in the detection module 115 are shared with the power amplifier 112 and the antenna 116 in the wireless charging device, so as to simplify the structure of the detection module 115 and reduce the design cost. Further, when the power amplifier 13 and the transmitting antenna 14 are shared with the power amplifier 112 and the antenna 116, the adjustable frequency generator 12 of the detecting module 115 outputs a sweep frequency signal to the power amplifier 112, and the status detector 15 of the detecting module 115 receives a status signal transmitted by the antenna 116.
In another embodiment of the present invention, the power amplifier 13 and the transmitting antenna 14 are separately disposed in the detection module 115, so as to avoid signal interference and improve the operation efficiency and the accuracy of the detection result.
In summary, the detection module of the wireless charging device can effectively detect whether a foreign object similar to the receiving module (or the receiving antenna) exists at the transmitting antenna by adjusting different sweep frequencies and times and adjusting a logic analysis range for performing logic analysis on the analysis signal of the transmitting antenna, without using a complex wireless charging chip and a scheme of a matched transmitting antenna with parameters difficult to adjust. Meanwhile, whether foreign matters or receiving antennas exist can be rapidly and accurately detected without using any wireless charging chip or any communication protocol, so that the function is stronger, and the cost is lower.
It should be noted that, in this document, 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. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (15)
1. A detection module of a wireless charging device for detecting whether a foreign object exists, comprising:
a frequency controller providing an adjustment signal;
an adjustable frequency generator that receives the adjustment signal from the frequency controller and generates a desired frequency sweep signal based on the adjustment signal;
the transmitting antenna is used for transmitting the sweep frequency signal to acquire an antenna signal and generating a state signal according to an acquisition result; and
an adjustable foreign matter characteristic detector for logically analyzing the collected result information of the state signal in the difference value range between the frequency spectrum range of the sweep frequency signal and the frequency range of the current antenna, outputting a corresponding analysis result, generating an indication signal according to the analysis result,
wherein the logic analysis comprises:
judging whether an acquisition signal representing the acquired antenna signal still exists in the difference range, and if the acquisition signal still exists in the difference range, indicating that a foreign matter exists at a transmitting antenna of the wireless charging device; and if the acquired signal is not in the difference range, indicating that no foreign matter exists at the transmitting antenna of the wireless charging device.
2. The detection module of claim 1, wherein the frequency spectrum range of the frequency sweep signal is greater than the frequency sweep frequency spectrum range corresponding to the current antenna.
3. The detection module of claim 1, further comprising:
and the power amplifier is connected with the adjustable frequency generator and is used for amplifying the sweep frequency signal and outputting the amplified sweep frequency signal to the transmitting antenna.
4. The detection module of claim 1, further comprising:
and the state detector is used for receiving the state signal from the transmitting antenna and filtering and analyzing the state signal to generate an analysis signal, wherein the analysis signal represents an acquisition result of the antenna signal.
5. The detection module of claim 1, further comprising:
and the indicator is connected with the adjustable foreign matter characteristic detector, receives the analysis result and displays the analysis result.
6. The detection module of claim 1, wherein the current antenna has a sweep frequency range that is a logic analysis range of the adjustable foreign object characteristic detector, the logic analysis range of the adjustable foreign object characteristic detector being adjustable.
7. The detection module of claim 6, wherein the adjustable foreign object characteristic detector comprises:
a first frequency signal generating unit that generates a frequency signal having a first threshold frequency;
a second frequency signal generating unit that generates a frequency signal having a second threshold frequency,
adjusting the first threshold frequency and/or the second threshold frequency to adjust a logic analysis range of the adjustable foreign object characteristic detector.
8. A wireless charging device, comprising:
an oscillator for generating a frequency signal;
the power amplifier is connected with the oscillator and used for amplifying the frequency signal;
a first antenna and a first matching network, the first antenna being connected to the power amplifier via the first matching network, the first antenna converting the frequency signal into a radiation field to transmit electrical energy;
the detection module according to any one of claims 1 to 5, connected to the first antenna, generating a sweep signal to collect an antenna signal, detecting whether a foreign object is present at the first antenna according to the collection result, and generating a corresponding indication signal according to the detection result;
and the control module is connected with the detection module to obtain the indication signal, is connected with at least one of the oscillator, the power amplifier and the first matching network, and provides corresponding control signals according to the indication signal.
9. The wireless charging device of claim 8, wherein said detection module shares said power amplifier and said first antenna in said wireless charging device,
the detection module amplifies the sweep frequency signal according to the power amplifier and transmits the amplified sweep frequency signal according to the first antenna.
10. The wireless charging device of claim 8, wherein the wireless charging device is in one of a transmit and idle mode.
11. The wireless charging device of claim 10, wherein the wireless charging device is in a transmit mode to transmit power via the first antenna when the detection module collects an antenna signal and detects the absence of foreign objects at the first antenna.
12. The wireless charging device of claim 10, wherein the wireless charging device is in an idle mode when the detection module does not collect an antenna signal, the wireless charging device ceasing to transmit power.
13. The wireless charging device of claim 10, wherein the wireless charging device is in an idle mode when the detection module collects an antenna signal and detects the presence of a foreign object at the first antenna, the wireless charging device ceasing to transmit power.
14. The wireless charging device of claim 8, wherein the wireless charging device further comprises:
and the memory is used for storing a reference frequency spectrum range, and the detection module generates the sweep frequency signal according to the reference frequency spectrum range.
15. The wireless charging device of claim 14, wherein a spectral range of the swept frequency signal is greater than the reference spectral range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407755.2A CN113131629B (en) | 2019-12-31 | 2019-12-31 | Wireless charging device and detection module thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911407755.2A CN113131629B (en) | 2019-12-31 | 2019-12-31 | Wireless charging device and detection module thereof |
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