CN111371201A - Foreign matter detection device of wireless charging system - Google Patents
Foreign matter detection device of wireless charging system Download PDFInfo
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- CN111371201A CN111371201A CN202010172620.9A CN202010172620A CN111371201A CN 111371201 A CN111371201 A CN 111371201A CN 202010172620 A CN202010172620 A CN 202010172620A CN 111371201 A CN111371201 A CN 111371201A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a foreign matter detection device of a wireless charging system, which is provided with a transmitting side detector, wherein the transmitting side detector is arranged at a transmitting end of the wireless charging system; the transmission-side detector includes: the first antenna set and the excitation circuit are connected in sequence; the first antenna set comprises a plurality of first antennas; each first antenna has a transmitting function and a receiving function; the exciting circuit is communicated with one first antenna, so that the first antenna starts a transmitting function and serves as a transmitting antenna to transmit signals; the first antenna except the transmitting antenna starts a receiving function as a receiving antenna to receive signals. According to the foreign matter detection device of the wireless charging system, the detection of the foreign matter is realized through the transmitting side detector and the receiving side detector, the detection of the foreign matter is realized through the antennas by the detectors on the two sides, and the danger caused by the entry of the foreign matter in the charging process is avoided.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a foreign matter detection device of a wireless charging system.
Background
If metal foreign matters exist on the power transmitting coil in the wireless charging process, the temperature can be increased sharply due to the eddy current effect generated on the metal foreign matters by the magnetic field, and even danger such as fire hazard can exist. At present, many designs exist, such as a detection coil such as a balance coil is added, and a foreign matter is found by measuring the impedance change and other parameters of the detection coil, the existing method can find the foreign matter attached to the surface of the emission coil, but the foreign matter existing in the space, such as a bottle with a metal cover, an object wrapped by a metal object and the like, cannot be detected by the method, and the method is still a hidden danger of wireless charging, particularly high-power wireless charging of an electric automobile and the like.
In addition to metal foreign matter detection, wireless charging of electric vehicles involves a risk of entry of living bodies such as infants and pets into a power transmission area, and it is necessary to increase a living body protection function to detect intrusion of living bodies. The existing living object detection is that a plurality of Doppler radars are arranged around a transmitting coil, when an organism approaches the transmitting coil, the organism is found through the Doppler effect of radar waves, so that shutdown alarm is triggered, and when the organism leaves, charging is resumed. However, there is a possibility that, if the living body enters the power transmission area after the charging system is stopped, the wireless charging system may not detect the entry of the living body and resume power transmission, and in this case, there is a possibility that damage may be caused to the health of the living body.
Disclosure of Invention
The invention provides a foreign matter detection device of a wireless charging system, which realizes foreign matter detection.
The foreign matter detection device of the wireless charging system is provided with a transmitting side detector, wherein the transmitting side detector is arranged at a transmitting end of the wireless charging system; the transmission-side detector includes: the first antenna set and the excitation circuit are connected in sequence; the first antenna set comprises a plurality of first antennas; each first antenna has a transmitting function and a receiving function; the exciting circuit is communicated with one first antenna, so that the first antenna starts a transmitting function and serves as a transmitting antenna to transmit signals; the first antenna except the transmitting antenna starts a receiving function as a receiving antenna to receive signals.
Preferably, the foreign matter detection apparatus further has a reception side detector including: the second antenna set, the second signal processing circuit and the second controller are connected in sequence; wherein the second antenna set has at least one second antenna for receiving signals transmitted by the transmitting antennas.
Preferably, the excitation circuit comprises a signal generator, a driving circuit and a power amplifier which are communicated, wherein the power amplifier is communicated with the selector switch.
Preferably, the emission-side detector further includes: the first detection circuit and the controller are communicated; the first detection circuit is communicated with the receiving antenna; the first detection circuit is provided with a first amplifier and a first filter which are communicated with each other; the first detection circuit acquires signals received by the receiving antenna, and the signals are processed by the first amplifier and the first filter and sent to the controller.
Preferably, the emission-side detector further includes: the second detection circuit and the controller are communicated; the second detection circuit is communicated with the receiving antenna; the second detection circuit comprises a second filter and a signal measurer which are communicated with each other; the second detection circuit obtains the signal received by the receiving antenna, and the signal is processed by the second filter and the signal measurer and sent to the controller.
Preferably, the second signal processing circuit includes: and the receiving signal processor, the receiving amplifier and the receiving filter are connected.
Preferably, a switch is connected to the first antenna set, and the switch selectively connects at least one of the first antennas to the excitation circuit, so that the at least one of the first antennas serves as a transmitting antenna to transmit signals; and using other first antennas as receiving antennas.
According to the foreign matter detection device of the wireless charging system, the detection of the foreign matter is realized through the transmitting side detector and the receiving side detector, the detection of the foreign matter is realized through the antennas by the detectors on the two sides, and the danger caused by the entry of the foreign matter in the charging process is avoided.
Drawings
Fig. 1 is a schematic view of a foreign object detection device of a wireless charging system according to the present application;
fig. 2 is a schematic diagram illustrating operation of a first antenna set in a foreign object detection device of the wireless charging system according to the present application.
Reference numerals:
a first set of antennas 11; a changeover switch 12; an excitation circuit 13; a first detection circuit 14; a second detection circuit 15; a controller 16; a second set of antennas 21; a second signal processing circuit 22; a second controller 23; a signal generator 131; a drive circuit 132; a power amplifier 133; a first amplifier 141; a first filter 142; a second filter 151; a signal measurer 152; a reception signal processor 221; a receiving amplifier 222; a reception filter 223; a transmitting antenna 11 t; the antenna 11r is received.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The foreign matter detection device of the wireless charging system of the invention is provided with a transmitting side detector. The transmitting side detector is arranged at a transmitting end of the wireless charging system. The transmitting end comprises a power transmitting coil, and the receiving end comprises a power receiving coil. When the wireless charging is carried out, a high-frequency driving source outputs alternating current with a certain frequency to be applied to a power transmitting coil to be excited to generate an electromagnetic field with the same frequency, and a power receiving coil positioned above the power transmitting coil generates current after being inductively coupled to the magnetic field, so that the wireless transmission of electric energy is realized.
The power transmitting coil comprises a transmitting coil winding, magnetic material, a back plane and a housing, and of course also a transmitting side detector. When wireless charging is carried out, the device which needs to be charged is also provided with a power receiving coil corresponding to the power transmitting coil, wherein the power receiving coil comprises a receiving coil winding, a magnetic material, a bottom plate, a shell and a receiving side detector.
The emission side detector includes: a first antenna set 11 and a drive circuit 13 connected in series.
The first antenna set 11 includes a plurality of first antennas, each of the first antennas has a receiving function and a transmitting function, generally, when the antenna is in operation, each of the first antennas sequentially starts the transmitting function to transmit signals, and the remaining first antennas start the receiving function. The specific operation principle and the effect of the first antenna to turn on the receiving function will be described in detail below. In some embodiments, the transmit or receive function of the first antenna may be switched by switching the switch 12.
In operation, one of the first antennas is typically connected to the excitation circuit 13 so that the first antenna acts as a transmitting antenna 11t for transmitting signals. Each first antenna in the first antenna set 11 has its own code, i.e. their structure, function and even size may be the same, but each has its own unique corresponding number for distinction. The "sequential" connections referred to herein are not necessarily sequential in the arrangement position, but rather are performed in a fixed order to ensure that the matching with the pre-known order is possible when the receiving side detector receives the corresponding signal.
In operation, at least one first antenna is connected to the excitation circuit 13 as a transmitting antenna 11t for transmitting signals, generally electromagnetic signals, which are received by other components for detection, thereby detecting the foreign object. The detection means, and the principle, will be explained later. Generally, only one first antenna is used as the transmitting antenna 11t to transmit signals at the same time, but the present application does not exclude the case where a plurality of transmitting antennas 11t can be operated at the same time, and the present application can also be used as long as the corresponding encoding or detecting rule is adjusted when receiving signals. In some embodiments, the switch 12 can control which first antenna is connected to the excitation circuit, and the connected first antenna is used as the transmitting antenna 11 t.
The first antennas are arranged in an array with the first antenna assembly located between the transmitter coil winding and the housing above it, and the entire array of first antennas covers the power transmitter coil surface and other areas where foreign object detection is desired.
The excitation circuit 13 comprises a signal generator 131, a drive circuit 132 and a power amplifier 133, preferably connected in series. Typically, the power amplifier 133 is connected to the first antenna (in this case, the transmitting antenna 11t), and when the switch 12 is provided, the exciting circuit 13 is directly connected to the switch 12.
The signal generator 131 generates an electromagnetic wave signal with a certain frequency, and loads a code corresponding to a first antenna of the first antenna set into the electromagnetic wave signal through signal modulation, and then amplifies the signal through the power amplifier 133, the power amplifier 133 is connected with the first antenna corresponding to the code, namely, the transmitting antenna 11t, and loads the electromagnetic signal onto the transmitting antenna 11t, and the electromagnetic signal is transmitted to the space above the power transmitting coil in the form of continuous or pulse electromagnetic waves.
The emitted electromagnetic wave can be received by a plurality of detection devices. Three as exemplified herein, one being a first detection circuit 14 located at the transmit side detector; the other is a second detection circuit 15 located at the transmission side detector; the third is a receive side detector. They are explained in detail below.
The first detection circuit 14:
the transmission-side detector further includes: a first detection circuit 14 and a controller 16 which are communicated; the first detection circuit 14 is in communication with the receiving antenna 11r (and in some embodiments with the switch 12, then directly with the switch 12). Generally, in the preferred embodiment, the receive antenna 11r is a different first antenna than the transmit antenna 11 t. The "different" mentioned here does not mean that the first antennas, which are different in structure, are used for both, but the first antenna as the reception antenna 11r and the first antenna as the transmission antenna 11t are not the same first antenna. In connection with the above, each of the first antennas has its own number, the "different" here means that the number of the first antenna as the receiving antenna 11r is different from the number of the first antenna as the transmitting antenna 11 t. In brief, the first antennas may function as a transmitting antenna or a receiving antenna, and in operation, at least one of the first antennas uses the transmitting function as the transmitting antenna 11t, and the other first antennas uses the receiving function as the receiving antenna 11 r. That is, some of all the first antennas are used as the reception antennas 11r and some are used as the transmission antennas 11 t.
Alternatively, the transmit antenna 11t and the receive antenna 11r are both first antennas, but function differently at different times. The transmitting antennas 11t transmit signals by turns, and when one transmitting antenna 11t transmits a signal, the other first antenna serves as a receiving antenna 11r to receive the signal reflected by the obstacle encountered by the signal transmitted by the one transmitting antenna 11 t.
It should be noted that the above is only a preferred embodiment, and in other embodiments, the first antenna as the transmitting antenna 11t may also be used as the receiving antenna at the same time, i.e. the first antenna may start the transmitting and receiving functions at the same time. In such an embodiment, at least one first antenna is used as the transmitting antenna 11t, and all the first antennas can be used as the receiving antennas 11r at the same time.
In the first antenna, the receiving antenna 11r may be provided in addition to the transmitting antenna 11t, in which case the transmitting antenna 11t only transmits signals. In some embodiments, however, the first antenna may initiate the receive function while the transmit function is turned on. That is, one transmitting antenna 11t can transmit a signal and also receive a reflected signal as a receiving antenna 11 r. It should be noted that although there are cases where both functions are turned on simultaneously, it is not common to have multiple first antennas turn on the transmit function simultaneously to avoid signal clutter.
When the first detection circuit is in operation, each receiving antenna 11r receives the electromagnetic signal reflected wave from the transmitting antenna 11t, and sends the electromagnetic signal reflected wave to the controller 16 for processing, so as to finally obtain parameters such as frequency, phase and the like.
The first detection circuit 14 has a first amplifier 141 and a first filter 142 in communication; the first detection circuit 14 is connected to the receiving antenna 11r, obtains a signal, processes the signal through the first amplifier 141 and the first filter 142, and sends the signal to the controller 16.
As shown in fig. 2, the transmitting antenna 11t transmits an electrical signal, and if there is a foreign object, the electrical signal is reflected, and the receiving circuit 11r receives the reflected signal, so as to determine the foreign object, and in particular, to determine a living object, a specific determination method, and the like, which will be described below. Because the position where the foreign object exists is not fixed, the directions of the positions of the reflected signals may be different, and therefore, when one transmitting antenna 11t operates, all other first antennas operate as the receiving antenna 11r, and even in some embodiments, the transmitting antenna 11t can simultaneously realize the function of the receiving antenna 11 r.
The above-mentioned transmitting antenna 11t and receiving antenna 11r are obtained by dividing the first antenna according to different division, and any one of the first antennas can be used as the transmitting antenna 11t and also as the receiving antenna 11r, not only if the first antenna has two types or is different.
It should be noted that, in fig. 1 and 2, the first antenna (the transmitting antenna 11t and the receiving antenna 11r) and the second antenna are schematic diagrams, and the external structures are shown in two shapes, but all the "antennas" in the present application are not limited by the drawings and should be arranged according to actual working requirements, for example, a planar spiral coil is commonly used.
Before the wireless charging is started or during the wireless charging power transmission process, when a living organism enters the detection range, the radio wave (electromagnetic wave) emitted by the transmitting antenna 11t is reflected, and the frequency of the reflected wave changes along with the moving state of the object. If the position of the object touched by the electromagnetic wave is fixed, the frequency of the reflected wave is equal to that of the transmitted wave; if the object moves towards the emitting direction, the reflected wave is compressed, namely the frequency of the reflected wave is increased; conversely, when the object moves away from the emission, the frequency of the reflected wave decreases. When the transmitting antenna 11t is in operation, the remaining first antenna serves as the receiving antenna 11r, receives the reflected wave, compares the frequency of the received electromagnetic reflected wave with the frequency of the transmitted electromagnetic wave, and if the frequency change value exceeds the safety threshold, it can be determined that a moving object is in the protection area of the transmitting coil. When the activity amplitude of the organism is not large or is static, the frequency change of the electromagnetic reflection wave is small or not changed, but the organism causes chest wall micro-motion or heartbeat signals due to respiratory motion to enable the reflection signals to generate time-varying phase shift, and the communication controller can also discover the organism after extracting the body motion signals which accord with life parameters such as infants from the received electromagnetic reflection signals. When the foreign matter detection device finds that the living body exists in the working area range, the living body protection abnormal information is sent to the wireless charging system main controller, the power transmission of wireless charging is stopped or not started, and alarm information is sent out.
The second detection circuit 15:
the transmission-side detector further includes: the second detection circuit 15 and the controller 16 are communicated; the second detection circuit 15 is in communication with the receiving antenna 11 r. The second detection circuit 15 comprises a second filter 151 and a signal measurer 152 communicated with each other; the second detection circuit 15 acquires the signal received by the receiving antenna 11r, and sends the signal to the controller 16 after being processed by the second filter 151 and the signal measurer 152. The second signal processing circuit 22 includes: a reception signal processor 221, a reception amplifier 222, and a reception filter 223 connected. The second detection circuit 15 is identical to the first detection circuit 14 in that the first antenna is connected, i.e. they share the receiving antenna 11 r.
The second detection circuit 15 and the first detection circuit 14 may share the controller 16. And, the receiving antennas 11r used by them are the same, that is, the signals received by the receiving antennas 11r can be received by both detecting circuits.
Metallic foreign objects on or near the upper surface of the power transmitting coil housing may also be equivalent to inductance and resistance, and have equivalent mutual inductance with the nearby transmitting antenna 11 t. When a metallic foreign object approaches the transmitting antenna 11t, the equivalent inductance and resistance of the transmitting antenna 11t change. Therefore, for a metallic foreign object near the power transmitting coil case, detection can be performed using the second detection circuit 15. The second filter 151 filters the signal of the transmitting antenna 11t and transmits the filtered signal to the signal measuring device 152, the signal measuring device 152 detects the change of one or more parameters such as the output impedance of the transmitting antenna, the phase and the frequency of the electromagnetic wave signal, and when the parameter change value exceeds a safety threshold, it can be determined that a metal foreign object exists on the surface of the power transmitting coil or in the vicinity thereof.
The following describes the reception-side detector. The receiver-side detector is independent of the transmitter-side detector, and in the case of an electric vehicle, the receiver-side detector is mounted on the vehicle, i.e. on the receiver side of the radio energy. The receiving side detector includes: a second antenna set 21, a second signal processing circuit 22 and a second controller 23 connected in this order.
There are also a plurality of second antennas in the second antenna set 21, which can receive the signals transmitted by the transmitting antennas 11 t. A plurality of second antennas may also form an array.
The second antenna set 21 may be integrated inside the power receiving coil, above the winding of the receiving coil, or may be arranged outside the power receiving coil, above the power receiving coil, i.e. between the power receiving coil and the power transmitting coil. The array of second antennas may cover a larger reception range than the array of first antennas. Within the normal offset operating range between the power transmitting coil and the power receiving coil, the second antenna set 21 can receive the electromagnetic wave signal transmitted by the transmitting antenna 11 t.
The receiving-side detector directly receives the electric signal transmitted from the transmitting antenna 11t by concentrating a plurality of second antennas through the second antennas. The second signal processing circuit 22 and the second controller 23 of the receiving-side detector perform monitoring analysis of the processing of the electrical signal. Generally, the second controller 23 can acquire the number of each first antenna in advance. The method can be specifically obtained through a wireless signal transmission mode, and can also be directly prefabricated.
The second signal processing circuit of the second antenna set includes a receive signal processor 221, a receive amplifier 222, and a receive filter 223. Preferably, the second antennas of the second antenna set are connected to the receiving amplifier 222, the electromagnetic signals received by the plurality of second antennas are fed to the signal processor 221 to be processed into an electromagnetic signal, the electromagnetic signal is fed to the receiving amplifier 222 to be amplified, and the amplified signal is fed to the receiving filter 223 to be filtered, so as to remove noise, especially interference signals generated by coupling of the power transmission magnetic field on the second antennas. The signal output from the receiving filter 223 is sent to the second controller 23 for detection, and parameters such as signal strength, phase, frequency, etc. are measured, and the code corresponding to the transmitting antenna is demodulated.
Before the wireless charging is started or in the wireless charging power transmission process, the excitation circuit 13 is switched on one transmitting antenna 11t at a time to transmit electromagnetic waves, the circuit of the receiving side detector is simultaneously connected with all the second antennas to obtain the electromagnetic waves transmitted by the transmitting antenna 11t, detect the parameters of electromagnetic wave signals and demodulate the corresponding codes of the transmitting antenna 11 t. The electromagnetic wave signal from the transmitting antenna 11t may be scattered and it is not possible to determine which of the second antennas is to receive, so that all the second antennas are turned on at the same time, and all the received signals are superimposed at the receiving end and restored to one signal.
Each first antenna is used as the transmitting antenna 11t in turn, and the above process is repeated and circulated, so that parameters such as signal strength when each first antenna is used as the transmitting antenna 11t can be continuously detected and obtained. When there is a metal foreign object on the upper side of the transmitting coil housing, including the surface or the space between the power transmitting coil and the power receiving coil, an eddy current is generated inside the metal due to electromagnetic induction to cause transmission energy loss, so that the transmission relationship between the transmitting antenna 11t and the second antenna is destroyed, and the energy of the electromagnetic wave signal received by the second antenna and the signal parameters thereof are changed. The strength of the electromagnetic wave received by the second antenna and sent by each transmitting antenna 11t can be calibrated in advance before the system leaves the factory, and the signal strength value and the corresponding transmitting antenna 11t code are sent to the communication controller of the receiving end through wireless communication by the communication controller of the transmitting end before the system is started (or can be transmitted in other manners). When the electromagnetic wave received by the second antenna and transmitted by more than one transmitting antenna 11t is lower than the calibrated signal intensity and the change of the signal intensity exceeds the safety threshold, the existence of the metal foreign matters on the surface of the power transmitting coil or in the upper space can be judged, and the positions of the foreign matters can be determined according to the coded value of the transmitting antenna 11 t. When the second controller 23 determines that a metal foreign object is found, the foreign object protection abnormal information is sent to the communication controller at the transmitting terminal of the wireless charging system, the power transmission of the wireless charging is stopped or not started, and alarm information is sent. Specifically, the component for transmitting the foreign object protection abnormality information may be the controller 23, or may be a separate communication device, which is available to those skilled in the art.
In some embodiments of the present invention, the second detection circuit 15 is used in combination with the receiving-side detector, so as to further improve the effectiveness of the detection of the metal foreign objects. The first detection circuit 14 may also be incorporated, i.e. three detection modes may be present simultaneously.
The first antenna and the second antenna can be planar antennas, the antennas can be wound by metal wires, and the antennas can also be manufactured by printing, etching, printing, metal deposition and other modes on a PCB. For convenience of description, the first antenna and the second antenna are collectively referred to as "antennas". The antenna can be in various shapes such as a fold line, a ring, a sheet, a spiral and the like, but avoids using a block metal body which can generate an eddy current effect so as to reduce eddy current loss generated by coupling power emission magnetic fields when the antenna transmits power. The polarization direction of the antenna, i.e. the direction of maximum radiation or maximum reception of the electromagnetic waves, is perpendicular to the antenna plane, wherein the electromagnetic waves emitted by the first antenna (transmitting antenna 11t) form two main lobes, upwards and downwards. The downward lobe is absorbed by the magnetic core material inside the power transmitting coil (in some embodiments, the first antenna that transmits electromagnetic waves is not used as the transmitting antenna 11t, and the receiving antenna 11r can also be used, and the upward lobe is received by the other transmitting antenna after encountering a foreign object or being reflected back by the receiving coil, which can be referred to as the receiving antenna 11r, and is described in detail below), and when the receiving coil is above the transmitting coil, the upward lobe can be obtained by the receiving antenna in the receiving coil.
To sum up, the foreign matter detection device of this application can three kinds of detection methods of integration simultaneously, can effectual improvement detection efficiency and accurate nature.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (7)
1. A foreign matter detection device of a wireless charging system is characterized in that,
the foreign matter detection device is provided with a transmitting side detector, and the transmitting side detector is arranged at a transmitting end of the wireless charging system;
the transmission-side detector includes: a first antenna set (11) and a drive circuit (13) which are connected in sequence; the first antenna set (11) comprises a plurality of first antennas; each first antenna has a transmitting function and a receiving function;
the excitation circuit (13) is communicated with one first antenna to enable the first antenna to start a transmitting function and serve as a transmitting antenna (11t) to transmit signals; the first antenna except the transmitting antenna (11t) turns on a receiving function as a receiving antenna (11r) to receive a signal.
2. The foreign object detection apparatus of a wireless charging system according to claim 1,
the foreign matter detection device further has a reception-side detector including: a second antenna set (21), a second signal processing circuit (22) and a second controller (23) which are connected in sequence; wherein the second set of antennas (21) has at least one second antenna for receiving signals transmitted by the transmit antennas (11 t).
3. The foreign object detection apparatus of a wireless charging system according to claim 1,
the excitation circuit (13) comprises a signal generator (131), a driving circuit (132) and a power amplifier (133) which are communicated, wherein the power amplifier (133) is communicated with the selector switch (12).
4. The foreign object detection apparatus of a wireless charging system according to claim 1,
the transmission-side detector further includes: the first detection circuit (14) and the controller (16) are communicated;
the first detection circuit (14) is in communication with the receiving antenna (11 r);
the first detection circuit (14) has a first amplifier (141) and a first filter (142) in communication;
the first detection circuit (14) acquires a signal received by the receiving antenna (11r), and the signal is processed by the first amplifier (141) and the first filter (142) and sent to the controller (16).
5. The foreign object detection apparatus of a wireless charging system according to claim 1,
the transmission-side detector further includes: the second detection circuit (15) and the controller (16) are communicated;
the second detection circuit (15) is in communication with the receiving antenna (11 r);
the second detection circuit (15) comprises a second filter (151) and a signal measurer (152) which are communicated with each other;
the second detection circuit (15) acquires the signal received by the receiving antenna (11r), and the signal is processed by the second filter (151) and the signal measurer (152) and sent to the controller (16).
6. The foreign object detection apparatus of a wireless charging system according to claim 2,
the second signal processing circuit (22) includes: a reception signal processor (221), a reception amplifier (222), and a reception filter (223) connected to each other.
7. The foreign object detection apparatus of a wireless charging system according to any one of claims 1, 4, or 5,
a switch (12) is connected to the first antenna set, and the switch (12) selectively connects at least one first antenna with the excitation circuit (13) to enable the at least one first antenna to be used as a transmitting antenna (11t) to transmit signals; and the other first antennas are used as receiving antennas (11 r).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010172620.9A CN111371201A (en) | 2020-03-12 | 2020-03-12 | Foreign matter detection device of wireless charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010172620.9A CN111371201A (en) | 2020-03-12 | 2020-03-12 | Foreign matter detection device of wireless charging system |
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| CN111371201A true CN111371201A (en) | 2020-07-03 |
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| CN202010172620.9A Pending CN111371201A (en) | 2020-03-12 | 2020-03-12 | Foreign matter detection device of wireless charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220239165A1 (en) * | 2021-01-28 | 2022-07-28 | Tdk Corporation | Position detection system and electric power transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220239165A1 (en) * | 2021-01-28 | 2022-07-28 | Tdk Corporation | Position detection system and electric power transmission system |
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