CN113131629A - Wireless charging device and detection module thereof - Google Patents
Wireless charging device and detection module thereof Download PDFInfo
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- CN113131629A CN113131629A CN201911407755.2A CN201911407755A CN113131629A CN 113131629 A CN113131629 A CN 113131629A CN 201911407755 A CN201911407755 A CN 201911407755A CN 113131629 A CN113131629 A CN 113131629A
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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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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; the adjustable frequency generator receives the adjusting signal from the frequency controller and generates an expected frequency sweeping signal according to the adjusting 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 logically analyzing the acquisition result information of the state signal in the difference value range of the frequency spectrum range of the sweep frequency signal and the sweep 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 save a special chip and simplify 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
The wireless charging technology is a technology for transmitting electric energy from a power supply device to a power consumption device in a wireless transmission manner. Since it is not necessary to use any physical plug and cable for connecting both, the electric device employing the wireless charging technology has an advantage of being conveniently and safely charged. 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 mobile phones.
However, the various power supply apparatuses respectively employ different power transfer means, 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, innpofi technology, Wi-Po technology. For a powered device, only the corresponding wireless charging standard is supported to match the power supply device to obtain power. The existing power supply equipment and the electric equipment adopt a special chip supporting at least one protocol, and are also provided with a corresponding receiving antenna and a corresponding transmitting antenna so as to detect whether foreign matters with characteristics similar to those of the receiving antenna exist at the transmitting antenna.
The use of a dedicated wireless charging chip in the power supply device and the electric device not only results in a complicated circuit structure but also can support only a limited type of predetermined protocol, and the dedicated receiving antenna and transmitting antenna also results in an increase in the size of the device.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a wireless charging device and a detection module thereof, which perform spectrum range analysis on a return state of a transmitting antenna to detect whether a foreign object exists, have good adaptability, and can omit a dedicated chip and simplify a system structure.
The invention provides a detection module of a wireless charging device, which is used for detecting whether foreign matters exist or not, and comprises: a frequency controller providing an adjustment signal; the adjustable frequency generator receives the adjusting signal from the frequency controller and generates an expected frequency sweeping signal according to the adjusting 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 logically analyzing the acquisition result information of the state signal in the difference value range of the frequency spectrum range of the sweep frequency signal and the sweep frequency range of the current antenna, outputting a corresponding analysis result and generating an indication signal according to the analysis result.
Preferably, the frequency sweep signal generated by the adjustable frequency generator has a frequency spectrum range larger than the frequency spectrum range of the frequency sweep corresponding to the current antenna.
Preferably, the method further comprises the following steps: and the power amplifier is connected with the adjustable frequency generator, amplifies the sweep frequency signal and outputs the amplified sweep frequency signal to the transmitting antenna.
Preferably, the method further comprises the following steps: and the state detector receives the state signal from the transmitting antenna, performs filtering analysis on the state signal to generate an analysis signal, and the analysis signal represents an acquisition result of the antenna signal.
Preferably, the method further comprises the following steps: 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 the logical analysis range of the adjustable foreign object characteristic detector, and the logical analysis range of the adjustable foreign object characteristic detector is adjustable.
Preferably, the adjustable foreign object property detector includes: a first frequency signal generating unit generating a frequency signal having a first threshold frequency; and the second frequency signal generating unit generates a frequency signal with a second threshold frequency, and adjusts the first threshold frequency and/or the second threshold frequency so as 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 a 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 a corresponding control signal 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 frequency sweep signal according to the power amplifier and transmits the amplified frequency sweep signal according to the first antenna.
Preferably, the wireless charging device is in one of a transmit and an 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 sending mode and transmits power through the first antenna.
Preferably, when the detection module does not acquire 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 a foreign object exists at the first antenna, the wireless charging device is in an idle mode, and the wireless charging device stops transmitting electric energy.
Preferably, the wireless charging device further includes: the memory stores a reference frequency spectrum range, and the detection module generates a sweep frequency signal according to the reference frequency spectrum range.
Preferably, the spectral range of the swept frequency signal is larger than the reference spectral range.
The invention has the beneficial effects that: the invention discloses a wireless charging device and a detection module thereof, which are used for acquiring antenna signals by generating sweep frequency signals, and further judging whether foreign matters exist at a transmitting antenna or not according to the acquisition result of the antenna signals within the difference range of the frequency spectrum range of the sweep frequency signals and the sweep frequency range of the current antenna.
And the antenna state signals containing the acquisition results are filtered, so that interference signals in the state signals are filtered, and the processing efficiency is improved.
By adjusting the threshold frequency of the frequency signal generated by the adjustable foreign matter characteristic detector, the logic analysis range of the foreign matter characteristic detector can be adjusted, so that the antennas with different installation structures are met, whether foreign matters similar to the receiving antenna exist at the transmitting antenna or not is effectively detected, and the applicability of the detection module is improved.
And the indicator is adopted to display the analysis result, so that the user can observe the analysis result 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.
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The above and other objects, features and advantages of the present invention will become more apparent from the following description of the 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 is a detailed block diagram of a detection module in a wireless charging apparatus according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth 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 below with reference to the accompanying drawings.
Fig. 1 shows a schematic block diagram of a wireless charging system according to the prior art. The wireless charging system 100 includes a power supply device 110 and a power consumption device 120, which transmit power therebetween by radio waves.
The power unit 110 generates a radiation field for providing energy transfer in the transmit mode. Powered device 120 is coupled to the radiated field, extracts electromagnetic energy from the radiated field and generates a charging current to charge battery 131. The power supply device 110 is spaced apart from the powered device 120. In this embodiment, the power sourcing equipment 110 and the 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 power sourcing equipment 110, power transfer losses between power sourcing equipment 110 and powered device 120 are minimal when powered device 120 is positioned in the "near field" of the radiated field.
The power unit 110 further includes an antenna 116 for providing a means for power transmission, and the powered device 120 further includes an antenna 126 for providing a means for power reception. The parameters of antennas 116 and 126 are set according to the application and the device to be associated therewith. The power transfer of the power sourcing equipment 110 and the powered device 120 is related to the coupling efficiency of the antennas 116 and 126, coupling most of the energy in the near field of the antenna 116 into the antenna 126, rather than propagating most of the energy in the form of electromagnetic waves into the far field. The area around antenna 116 and antenna 126 where this near-field coupling can occur is referred to as a coupling-mode region.
The power supply device 110 further includes 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 in accordance with 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 radiated field. The matching network 113 is used to match the impedance of the power supply device 110 to the antenna 116.
The powered device 120 further includes a matching network 121, and a rectifier 122. The matching network 121 is used to match the impedance of the powered device 120 to the antenna 126. The rectifier 122 converts the electric energy received via the antenna 126 into a dc output voltage to charge the battery 131 or directly supply power to the circuit module of the electric device.
In the wireless charging system 100 according to the related art, the powered device 120 and the power supply device 110 may communicate on separate communication channels (e.g., bluetooth, zigbee, cellular, etc.) so as to comply with data communication requirements of the relevant protocol.
Fig. 2 shows a schematic block diagram of a wireless charging system according to an embodiment of the invention. The wireless charging system 200 includes a power supply device 210 and a power consumption device 220, wherein the power supply device 210 is spaced apart from the power consumption device 220, and the power and data are transmitted therebetween by using radio waves.
The power supply device 210 generates a frequency sweep signal for detecting the receiving antenna in the detection state, and generates an indication signal for representing the detection result according to the detection result of the frequency sweep signal. And then judging whether to enter a sending mode according to the indication signal.
In this embodiment, when the frequency sweep signal is used to detect the receiving antenna, the frequency sweep signal is used to collect the antenna signal within a spectrum range with a certain width, so as to determine whether the receiving antenna exists according to the collection result. Further, when a foreign object similar to the receiving antenna exists at the transmitting antenna, the frequency sweep signal may also acquire the antenna signal, but a frequency spectrum range corresponding to the frequency sweep signal when the antenna signal corresponding to the foreign object is acquired is obviously larger than a frequency spectrum range corresponding to the frequency sweep signal when the antenna signal corresponding to the receiving antenna is acquired. The present invention performs foreign matter detection based on this principle.
When detecting the presence of the receiving antenna, the power supply apparatus 210 enters a transmission mode. The power unit 210 generates a radiation field for providing energy transfer in the transmit mode. Powered device 220 is coupled to the radiated field, extracts electromagnetic energy from the radiated field and generates a charging current to charge battery 131. The power supply device 210 is spaced apart from the power consuming device 220. In this embodiment, the power sourcing equipment 210 and the 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.
The power unit 210 further includes an antenna 116 for providing a means for power transmission, and the powered device 220 further includes an antenna 126 for providing a means for power reception. The parameters of antennas 116 and 126 are set according to the application and the device to be associated therewith. The power transfer of the power sourcing equipment 210 and the powered device 220 is related to the coupling efficiency of the antennas 116 and 126, coupling most of the energy in the near field of the antenna 116 into the antenna 126, rather than propagating most of the energy in the form of electromagnetic waves into the far field. The area around antenna 116 and antenna 126 where this near-field coupling can occur is referred to as a 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 according to 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 radiated field. The matching network 113 is used to match the impedance of the power supply 210 to the antenna 116. The detection module 115 is connected to the antenna 116, and is configured to generate a frequency sweep signal to acquire an antenna signal, detect whether a foreign object exists at the antenna 116 according to an acquisition 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 a control signal required by at least one of the oscillator 111, the power amplifier 112, and the matching network 113 according to the indication signal.
Due to the different mounting structures of the transmitting antenna and the receiving antenna, the required frequency and time of the frequency sweep are different. The detection module 115 generates sweep signals having different sweep frequency ranges and sweep times depending on the current antenna mounting configuration.
Further, the frequency spectrum range of the sweep signal generated by the detection module 115 is larger than the frequency spectrum range of the sweep corresponding to the current antenna mounting structure.
Further, when the indication signal indicates that there is no receiving antenna or a foreign object having a similarity with the receiving antenna (i.e., the sweep signal does not acquire an antenna signal or acquires an antenna signal but detects that there is a foreign object having a similarity with 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, that is, 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 there is a receiving antenna (i.e., the antenna signal is acquired by the sweep signal) but there is no foreign object having a similarity with the receiving antenna, 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 at this time, the power supply device 210 enters a sending mode to transmit power through the antenna 116. Meanwhile, when the indication signal indicates that there is a foreign object having a similarity with the receiving antenna, the control module 114 also 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 performs foreign object detection again after the foreign object is removed.
In one embodiment of the present invention, the power supply device 210 further includes a memory, and the memory stores reference spectrum ranges corresponding to antennas of different mounting structures. The detection module 115 can obtain the reference spectrum range from the memory to generate a sweep signal with a wider spectrum range according to the reference spectrum range for detecting the alien material. Therefore, automatic detection of the antennas with different mounting structures can be achieved, manual selection of frequency spectrum ranges is not needed, and detection efficiency and accuracy are improved.
It should be noted that the reference spectrum range is a sweep spectrum range required for detecting antennas of different mounting structures, which is known data.
The powered device 220 also includes a matching network 121, a rectifier 122, and a configuration module 123. The matching network 121 is used to match the impedance of the powered device 220 to the antenna 126. The rectifier 122 converts the electric energy received via the antenna 126 into a dc output voltage to charge the battery 131 or directly supply power to the circuit module of the electric device. The configuration module 123 is connected to the antenna 126, and modulates the configuration data into a data signal, which is transmitted to the power supply device 210 via the antenna 126.
In a wireless charging device, antenna 116 combines power transfer and data communication functions. In the transmitting mode, the wireless charging device transmits radio waves of an operating frequency via the antenna 116 to transmit power, and receives radio waves of a communication frequency via the antenna 116 to receive data signals. The wireless charging apparatus is, for example, the power supply device 210 in the wireless charging system 200.
In this embodiment, the detection module performs foreign object detection by generating sweep signals of different sweep frequencies (spectrum ranges) and sweep times, so as to quickly and accurately detect whether foreign objects exist or whether the receiving antenna exists, and the functionality is stronger. Therefore, any wireless charging chip and any communication protocol are not needed, and the cost is reduced.
Fig. 3 is a detailed block diagram of a detection module in a wireless charging apparatus according to an embodiment of the present invention. The wireless charging apparatus 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 status detector 15, a foreign object characteristic detector 16, and an indicator 17. The detection module 115 generates a sweep frequency signal with a certain frequency spectrum range to acquire an antenna signal, and further controls the operating state of the wireless charging device according to whether a foreign object exists at the detection antenna 116 and according to a detection result, generates a corresponding indication signal.
Wherein the frequency controller 11 generates the adjustment signal according to the spectral range of the frequency sweep signal. The frequency spectrum range of the sweep signal is larger than the frequency spectrum range corresponding to the current antenna mounting structure.
The frequency controller 11 determines a sweep frequency range and a 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 according to the adjustment signal. The adjustment signal controls the frequency generated by the adjustable frequency generator 12 to vary within the frequency spectrum in a certain order, thereby generating a frequency sweep signal.
The power amplifier 13 is connected to the adjustable frequency generator 12, and performs power amplification on the frequency sweep signal.
The transmitting antenna 14 is connected to the power amplifier 13, and transmits the power-amplified sweep frequency signal to acquire an antenna signal, and generates a status signal according to an acquisition result, where the status signal includes information of the acquisition result.
The status detector 15 is connected to the transmitting antenna 14, receives the status signal, and performs filtering analysis on the status signal to generate an analysis signal. The state detector 15 filters out interference signals in the state signals, only the analytic signals representing the acquisition results of the antenna signals are reserved, and the processing efficiency is improved.
The tunable foreign object characteristic detector 16 logically analyzes the acquisition result information of the state signal (or the analytic signal) in the difference range between the frequency spectrum range of the sweep frequency signal generated by the tunable frequency generator 12 and the sweep frequency range of the current antenna, and outputs a corresponding analysis result. The current frequency sweep range of the antenna is the logical analysis range of the tunable foreign object property detector 16. In this embodiment, the logical analysis range of the tunable foreign object characteristic detector 16 is tunable.
The adjustable foreign object characteristic detector 16 includes a first frequency signal generating unit to generate a frequency signal having a first threshold frequency and a second frequency signal generating unit; the second frequency signal generating unit is used for generating a frequency signal with a second threshold frequency. The adjustable foreign object characteristic detector 16 performs logic analysis on the acquired result information in the status signal or the analytic signal in the frequency range corresponding to the first threshold frequency and the second threshold frequency to determine whether a receiving antenna or a foreign object having a similarity with the receiving antenna exists. If the acquisition result information of the state signal (or the analytic signal) in the difference range of the frequency spectrum range of the sweep frequency signal generated by the adjustable frequency generator 12 and the sweep frequency range of the current antenna is logically analyzed, whether the acquisition signal representing the acquired antenna signal still exists in the difference range of the frequency spectrum range and the sweep frequency range of the current antenna is judged, and if the acquisition signal exists, a foreign matter similar to the receiving antenna exists at the transmitting antenna of the wireless charging device; if the foreign object does not exist, the foreign object similar to the receiving antenna does not exist at the transmitting antenna of the wireless charging device.
Accordingly, if the analysis signal indicates that the antenna signal is detected within the frequency spectrum range of the sweep signal, it directly indicates that there is no foreign object having a similarity with the receiving antenna at the transmitting antenna of the wireless charging device.
The adjustable foreign object characteristic detector 16 is further configured to generate an indication signal according to the analysis result, wherein the indication signal is used for receiving the presence of the antenna, so as to further control the operation state of the wireless charging device.
Due to the different transmit antennas and antenna mounting configurations, the required frequency and time of the sweep will vary, as well as the required range of logical analysis. At this time, by adjusting the threshold frequency of the frequency signal generated by the adjustable foreign object characteristic detector 16, the logic analysis range of the foreign object characteristic detector 16 can be adjusted to meet the requirements of antennas with different mounting structures, so as to effectively detect whether a foreign object having similarity with a receiving antenna exists at the transmitting antenna, thereby improving the applicability of the detection module 115. The logical analysis range of the tunable alien material characteristic detector 16 is the frequency sweep spectrum range corresponding to the current antenna mounting structure in the wireless charging device.
The indicator 17 is connected to the adjustable foreign object property detector 16 and receives 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 by the power amplifier 112 and the antenna 116, the tunable frequency generator 12 of the detection module 115 outputs a frequency sweep signal to the power amplifier 112, and the status detector 15 of the detection module 115 receives the 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 detecting module 115 to avoid signal interference and improve the operation efficiency and the accuracy of the detecting 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 frequency and time of sweeping and adjusting the logic analysis range for performing logic analysis on the analytic signal of the transmitting antenna, without using a complicated wireless charging chip with difficult parameter adjustment and a scheme of matching the transmitting antenna. Meanwhile, any wireless charging chip and any communication protocol are not needed, whether foreign matters or receiving antennas exist can be detected quickly and accurately, the functionality is stronger, and the cost is lower.
It should be noted that, in this document, the contained 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (15)
1. A detection module of a wireless charging device is used for detecting whether foreign matters exist or not, and comprises:
a frequency controller providing an adjustment signal;
the adjustable frequency generator receives the adjusting signal from the frequency controller and generates a desired frequency sweeping signal according to the adjusting 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
and the adjustable foreign matter characteristic detector is used for logically analyzing the acquisition result information of the state signal in the difference value range of the frequency spectrum range of the sweep frequency signal and the sweep frequency range of the current antenna, outputting a corresponding analysis result and generating an indication signal according to the analysis result.
2. The detection module of claim 1, wherein the swept frequency signal has a spectral range that is greater than a swept spectral range corresponding to a current antenna.
3. The detection module of claim 1, further comprising:
and the power amplifier is connected with the adjustable frequency generator, amplifies the sweep frequency signal and outputs 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, filtering and analyzing the state signal to generate an analysis signal, and 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 a frequency sweep range of a current antenna is a logical analysis range of the tunable foreign object property detector, the logical analysis range of the tunable foreign object property detector being tunable.
7. The detection module of claim 6, wherein the adjustable foreign object characteristic detector comprises:
a first frequency signal generating unit generating a frequency signal having a first threshold frequency;
a second frequency signal generating unit generating a frequency signal having a second threshold frequency,
adjusting the first threshold frequency and/or the second threshold frequency to adjust a logical analysis range of the tunable 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 is 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 according to any one of claims 1 to 5, connected to the first antenna, for generating a frequency sweep signal to collect an antenna signal, detecting whether a foreign object exists 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 a corresponding control signal according to the indication signal.
9. The wireless charging apparatus of claim 8, wherein the detection module shares the power amplifier and the first antenna in the wireless charging apparatus,
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 apparatus of claim 8, wherein the wireless charging apparatus is in one of a transmit and an idle mode.
11. The wireless charging device of claim 10, wherein the wireless charging device is in a transmit mode when the detection module collects an antenna signal and detects that no foreign object is present at the first antenna, the wireless charging device transmitting power via the first antenna.
12. The wireless charging device of claim 10, wherein 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 power.
13. The wireless charging device of claim 10, wherein when the detection module collects an antenna signal and detects that a foreign object is present at the first antenna, the wireless charging device is in an idle mode and stops transmitting power.
14. The wireless charging apparatus of claim 8, wherein the wireless charging apparatus further comprises:
and the memory stores 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 apparatus 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 |
Applications Claiming Priority (1)
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