CN113285535A - System for detecting foreign matters and transmitting electric energy in magnetic resonance wireless electric energy transmission - Google Patents
System for detecting foreign matters and transmitting electric energy in magnetic resonance wireless electric energy transmission Download PDFInfo
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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
- G01V3/14—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electron or nuclear magnetic resonance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- 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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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
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Abstract
The invention discloses a system for detecting foreign matters and transmitting electric energy in magnetic resonance wireless electric energy transmission, which comprises a magnetic resonance wireless electric energy transmission subsystem and a magnetic resonance wireless electric energy foreign matter detection subsystem which are connected; the magnetic resonance wireless power foreign matter detection subsystem is used for detecting foreign matters; the magnetic resonance wireless power transmission subsystem is used for carrying out wireless power transmission according to the detection result of the magnetic resonance wireless power foreign matter detection subsystem to supply power to the load. The magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the same control circuit or use two control systems capable of two-way communication, so that time delay of information processing and information transmission is reduced, a transmitting circuit of the wireless power transmission system can be protected at the first time when foreign matters are detected, and the purpose of foreign matter detection is achieved better.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a system for detecting foreign matters and transmitting power in magnetic resonance wireless power transmission.
Background
With the continuous development of electronic information technology and automation control technology, various home appliances, consumer electronics, mobile communication devices, and the like have been widely popularized, however, conventional home appliances rely on a wired connection between a power line and a power socket to supply power, and electronic devices using a built-in battery also need a wired connection between a charging wire and the power socket to be charged, so that we can see the wires for supplying power to the electronic devices everywhere. The wires not only occupy the activity space of people and limit the convenience of equipment use, but also create the hidden danger of safe electricity utilization. Therefore, with the increasing demand of people for portable devices and green energy systems that can be used completely wirelessly, research and application of wireless energy transmission technology is rapidly becoming the focus of academic and industrial circles at home and abroad. Because the device has the advantages of no wire limitation, no plugging and unplugging and the like, the device is more and more widely applied to electronic equipment at present. At present, more and more electronic devices adopt wireless charging devices to wirelessly charge the electronic devices, for example, the electronic devices may be mobile phones, wearable devices, and the like; the principle of the wireless charging technology is to transmit electric energy through magnetic field coupling between a transmitting coil of a transmitting end and a receiving coil of a receiving end. For example, for wireless charging of a mobile phone, the wireless charging device is a wireless charger, and the electronic device is a mobile phone. The transmitting coil is positioned in the wireless charger, and the receiving coil is positioned in the mobile phone. However, when an NFC card or an RFID tag exists between the transmitting coil and the receiving coil, the NFC card or the RFID tag may be damaged by a magnetic field varying between the transmitting coil and the receiving coil, so that the NFC card or the RFID tag cannot be used when damaged; when a metal foreign body exists between the transmitting coil and the receiving coil, eddy current is generated on the foreign body by a changing magnetic field between the transmitting coil and the receiving coil or the foreign body is coupled to energy transmitted by the transmitting coil, so that heat is generated, a transmitting circuit can be damaged, and safety problems such as fire and the like are easily caused due to heating; when the non-charging electronic equipment exists between the transmitting coil and the receiving coil, electromagnetic energy transmitted in the air by the transmitting coil can be coupled by a circuit board inside the non-charging electronic equipment, so that the non-charging electronic equipment cannot work normally or is damaged; therefore, foreign object detection is a technical problem to be solved by the wireless charging technology.
Disclosure of Invention
The invention aims to solve the problem of foreign matter detection in the field of magnetic resonance wireless power transmission, and provides a magnetic resonance wireless power transmission device.
The technical scheme of the invention is as follows: a system for detecting foreign matters and transmitting electric energy through magnetic resonance wireless electric energy transmission comprises a magnetic resonance wireless electric energy transmission subsystem and a magnetic resonance wireless electric energy foreign matter detection subsystem which are in communication connection;
the magnetic resonance wireless power foreign matter detection subsystem is used for detecting foreign matters;
the magnetic resonance wireless power transmission subsystem is used for carrying out wireless power transmission according to the detection result of the magnetic resonance wireless power foreign matter detection subsystem to supply power to the load.
The invention has the beneficial effects that:
(1) the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the same control circuit or use two control systems capable of two-way communication, so that time delay of information processing and information transmission is reduced, a transmitting circuit of the wireless power transmission system can be protected at the first time when foreign matters are detected, and the purpose of foreign matter detection is achieved better.
(2) The magnetic resonance wireless electric energy transmission subsystem and the magnetic resonance wireless electric energy foreign matter detection subsystem respectively adopt different working frequencies, so that the two systems can work simultaneously, the real-time detection of foreign matters and the timely protection of a transmitting circuit are realized, the two systems have small interference on each other, and the normal work of each other cannot be influenced.
Further, the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem adopt different working frequencies.
The beneficial effects of the further scheme are as follows: in the invention, the two systems adopt different working frequencies, so that the two systems can work simultaneously, the real-time detection of foreign matters and the timely protection of the transmitting circuit are realized, and the two systems adopt different working frequencies, so that the two systems have small interference on each other and cannot influence the normal work of each other.
Furthermore, the magnetic resonance wireless power transmission subsystem comprises a first control circuit, a first power amplifier, a first impedance matching network, a first transmitting resonant network, a first transmitting antenna, a receiving resonant network, a rectification voltage stabilizing circuit and a load which are connected in sequence;
the first control circuit is used for acquiring parameters of the magnetic resonance wireless power transmission subsystem and controlling the magnetic resonance wireless power transmission subsystem to work;
the first power amplifier is used for amplifying the power of the wireless energy and converting the direct current power into radio frequency energy;
the first impedance matching network is used for carrying out impedance transformation and matching the output impedance of the first power amplifier to the input impedance of the first transmitting resonant network;
the first transmitting resonant network and the first transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power transmission subsystem by adjusting the parameters of components of the first transmitting resonant network; therefore, the system can be suitable for any working frequency band;
the first transmitting antenna is used for transmitting radio frequency energy to a space where the first transmitting antenna is located;
the receiving antenna is used for receiving radio frequency energy;
the receiving antenna and the receiving resonant network form an LC series-parallel resonant circuit which is used for rectifying the radio frequency energy into a direct current signal;
the rectifier bridge of the rectification voltage stabilizing circuit is used for rectifying and stabilizing the direct-current signal and providing the direct-current signal for a load.
Furthermore, the magnetic resonance wireless power foreign matter detection subsystem comprises a second control circuit, a second power amplifier, a second matching impedance network, a second transmitting resonant network and a second transmitting antenna which are connected in sequence, and the first control circuit is connected with the second control circuit;
the second control circuit is used for detecting whether foreign matters exist in the magnetic resonance wireless power transmission subsystem or not;
the second power amplifier is used for amplifying the power of the wireless energy and converting the direct current power into radio frequency energy;
the second matching impedance network is used for carrying out impedance transformation and matching the output impedance of the second power amplifier to the input impedance of the second transmitting resonant network;
the second transmitting resonant network and the second transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power foreign matter detection subsystem;
the second transmitting antenna is used for transmitting the radio frequency energy to the space where the second transmitting antenna is located.
Further, the specific method for detecting whether the foreign object exists by the second control circuit is as follows: judging whether the return loss, the impedance Zin and the parameter change value of the input current of the magnetic resonance wireless power foreign matter detection subsystem exceed a set threshold value or not by using a second control circuit, if so, judging that foreign matters exist in the magnetic resonance wireless power transmission subsystem, and disconnecting the power supply of the magnetic resonance wireless power transmission subsystem by using a first control circuit; otherwise, the magnetic resonance wireless power transmission subsystem has no foreign matter and starts the magnetic resonance wireless power transmission subsystem to work by utilizing the first control circuit.
The beneficial effects of the further scheme are as follows: in the invention, the first control circuit and the second control circuit are not limited to two separate circuits, namely the control magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem can share the same control circuit or two circuits which can be in two-way communication; the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the control circuit, so that time delay of information processing and information transmission can be reduced, a transmitting circuit of the magnetic resonance wireless power transmission subsystem can be protected at the first time when foreign matters are detected, and the purpose of foreign matter detection is better achieved.
Drawings
FIG. 1 is a block diagram of a system;
FIG. 2 is a logic diagram of the overall system operation;
fig. 3 is a transmission antenna diagram of the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem;
figure 4 is a transmission antenna diagram of a magnetic resonance wireless power transmission subsystem;
FIG. 5 is a transmission antenna diagram of a magnetic resonance wireless power foreign matter detection subsystem;
fig. 6 is a comparison graph of return loss S11 corresponding to each point in fig. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem;
FIG. 7 is a comparison graph of impedance Zin values corresponding to points in FIG. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem;
FIG. 8 is a graph comparing the input current change at each point in FIG. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem;
in the figure, 401, a first transmit antenna; 402. a first connection point; 403. a first transmission antenna compensation section; 404. a first energy feed-in port; 501. a second transmitting antenna; 502. a second connection point; 503. a second transmitting antenna compensation section; 504. a second energy feed.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a system for detecting a foreign object in magnetic resonance wireless power transmission and transmitting power, which includes a magnetic resonance wireless power transmission subsystem and a magnetic resonance wireless power foreign object detection subsystem connected with each other;
the magnetic resonance wireless power foreign matter detection subsystem is used for detecting foreign matters;
the magnetic resonance wireless power transmission subsystem is used for carrying out wireless power transmission according to the detection result of the magnetic resonance wireless power foreign matter detection subsystem to supply power to the load.
In the embodiment of the invention, the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem adopt different working frequencies.
The two systems adopt different working frequencies, so that the two systems can work simultaneously, the real-time detection of foreign matters and the timely protection of the transmitting circuit are realized, and the two systems adopt different working frequencies, so that the interference of the two systems to each other is very small, and the normal work of each other cannot be influenced.
In the embodiment of the present invention, as shown in fig. 1, the magnetic resonance wireless power transmission subsystem includes a first control circuit, a first power amplifier, a first impedance matching network, a first transmit resonant network, a first transmit antenna, a receive resonant network, a rectification voltage stabilizing circuit, and a load, which are connected in sequence;
the first control circuit is used for acquiring parameters of the magnetic resonance wireless power transmission subsystem and controlling the magnetic resonance wireless power transmission subsystem to work;
the first power amplifier is used for amplifying the power of the wireless energy and converting the direct current power into radio frequency energy;
the first impedance matching network is used for carrying out impedance transformation and matching the output impedance of the first power amplifier to the input impedance of the first transmitting resonant network;
the first transmitting resonant network and the first transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power transmission subsystem by adjusting the parameters of components of the first transmitting resonant network; therefore, the system can be suitable for any working frequency band;
the first transmitting antenna is used for transmitting radio frequency energy to a space where the first transmitting antenna is located;
the receiving antenna is used for receiving radio frequency energy;
the receiving antenna and the receiving resonant network form an LC series-parallel resonant circuit which is used for rectifying the radio frequency energy into a direct current signal;
the rectifier bridge of the rectification voltage stabilizing circuit is used for rectifying and stabilizing the direct-current signal and providing the direct-current signal for a load.
The direct current power is subjected to impedance conversion in the impedance conversion circuit through the first transmitting power amplifier, then is transmitted to a space near the first transmitting antenna through the first transmitting resonant network and the first transmitting antenna, the receiving antenna and the receiving resonant network obtain energy through magnetic resonance coupling, and finally is supplied to a load through the rectifying and voltage stabilizing circuit.
In the embodiment of the present invention, as shown in fig. 1, the magnetic resonance wireless power foreign object detection subsystem includes a second control circuit, a second power amplifier, a second matching impedance network, a second transmitting resonant network, and a second transmitting antenna, which are connected in sequence, and the first control circuit is connected to the second control circuit;
the second control circuit is used for detecting whether foreign matters exist in the magnetic resonance wireless power transmission subsystem or not;
the second power amplifier is used for amplifying the power of the radio energy and converting the energy into radio frequency energy;
the second matching impedance network is used for carrying out impedance transformation and matching the output impedance of the second power amplifier to the input impedance of the second transmitting resonant network;
the second transmitting resonant network and the second transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power foreign matter detection subsystem;
the second transmitting antenna is used for transmitting the radio frequency energy to the space where the second transmitting antenna is located.
The energy is converted into radio frequency energy from DC through a second transmitting power amplifier, impedance matching is carried out through a second matching impedance network, the radio frequency energy is transmitted to a space near a second transmitting antenna through a second transmitting resonant network and the second transmitting antenna, parameters such as impedance, current and the like of the system can be greatly changed when foreign matters exist in an electromagnetic field space transmitted by the second transmitting antenna, parameter circuits such as impedance Zin, input current detection and the like in the magnetic resonance wireless electric energy foreign matter detection subsystem transmit collected values back to a control circuit to judge whether foreign matters exist in the system, and the control circuit controls the on-off of the magnetic resonance wireless electric energy transmission subsystem according to the judged result. The second transmission power amplifier is used for amplifying the small signal into a high-power signal, the second impedance matching network is used for matching the output impedance of the second power amplifier to the input impedance of the second transmission resonant network, and the second transmission resonant network and the second transmission coil form an LC series-parallel resonant circuit.
In the embodiment of the present invention, a specific method for detecting whether there is a foreign object by the second control circuit includes: judging whether the return loss, the impedance Zin and the parameter change value of the input current of the magnetic resonance wireless power foreign matter detection subsystem exceed a set threshold value or not by using a second control circuit, if so, judging that foreign matters exist in the magnetic resonance wireless power transmission subsystem, and disconnecting the power supply of the magnetic resonance wireless power transmission subsystem by using a first control circuit; otherwise, the magnetic resonance wireless power transmission subsystem has no foreign matter and starts the magnetic resonance wireless power transmission subsystem to work by utilizing the first control circuit.
When foreign matters exist in the electromagnetic field space emitted by the second transmitting antenna, parameters such as impedance Zin, input current and the like of the magnetic resonance wireless power foreign matter detection subsystem can be caused to change violently, each parameter detection circuit in the magnetic resonance wireless power transmission foreign matter detection system transmits the value back to the control circuit to judge whether foreign matters exist in the system, and the control circuit controls the magnetic resonance wireless power transmission subsystem to be switched on or off according to the judged result;
the first control circuit and the second control circuit are not limited to two separate circuits, namely the control magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem can share the same control circuit or can be two-way communication circuits; the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the control circuit, so that time delay of information processing and information transmission can be reduced, a transmitting circuit of the magnetic resonance wireless power transmission subsystem can be protected at the first time when foreign matters are detected, and the purpose of foreign matter detection is better achieved.
In the embodiment of the present invention, as shown in fig. 2, the working flow of the present invention is as follows: when the whole circuit is powered on, the magnetic resonance wireless electric energy foreign matter detection subsystem starts to work, when the value acquired in the magnetic resonance wireless electric energy foreign matter detection subsystem circuit exceeds the range of the preset value, the foreign matter is judged to be present in the system, the first control circuit does not start the power supply of the magnetic resonance wireless electric energy transmission subsystem, the magnetic resonance wireless electric energy foreign matter detection subsystem continues to detect until the system judges that no foreign matter is present, if the foreign matter is judged to be absent in the system, the control circuit starts the power supply of the magnetic resonance wireless electric energy transmission subsystem, the magnetic resonance wireless electric energy transmission subsystem starts to work normally, the magnetic resonance wireless electric energy foreign matter detection subsystem also works, if the magnetic resonance wireless electric energy foreign matter detection subsystem judges that the foreign matter is present, the magnetic resonance wireless electric energy transmission subsystem is powered off and returns to the initial state, otherwise, the magnetic resonance wireless electric energy transmission subsystem enters the scanning state, if the magnetic resonance wireless power foreign matter detection subsystem judges that foreign matters exist at the moment, the magnetic resonance wireless power transmission subsystem is powered off and returns to the initial state, otherwise, the wireless power transmission subsystem enters a normal working state, if the magnetic resonance wireless power foreign matter detection subsystem judges that foreign matters exist at the moment, the magnetic resonance wireless power transmission subsystem is powered off and returns to the initial state, and otherwise, the magnetic resonance wireless power foreign matter detection subsystem always detects whether foreign matters exist.
The magnetic resonance wireless power foreign matter detection subsystem works before the magnetic resonance wireless power transmission subsystem, when the control circuit judges that no foreign matter exists in the magnetic resonance wireless power foreign matter detection subsystem, the magnetic resonance wireless power transmission subsystem starts to work, the magnetic resonance wireless power foreign matter detection subsystem can carry out foreign matter detection in three states of non-working state, low-power scanning state and normal charging state of the magnetic resonance wireless power transmission subsystem, namely, the magnetic resonance wireless power foreign matter detection subsystem starts to work when the whole system starts to be electrified, and the power supply of the whole system is disconnected.
As shown in fig. 3-5, the transmitting antenna structure and size of the magnetic resonance wireless power foreign matter detection subsystem in the present embodiment are not fixed, but it follows that when a foreign matter exists in the system, parameters such as impedance Zin and input current in the circuit can be greatly changed no matter where the foreign matter is located in the transmitting antenna, and the changed quantities of the foreign matter at any location in the transmitting antenna are close to each other. As shown in fig. 3, the length and width of the transmitting antenna of the magnetic resonance wireless power transmission subsystem and the transmitting antenna of the magnetic resonance wireless power foreign object detection subsystem in this embodiment are both 200 mm. As shown in fig. 4, the transmit antenna of the magnetic resonance wireless power transmission subsystem designed for this embodiment, wherein 401 is a first transmit antenna, 403 is a first transmit antenna compensation portion, 402 is a first connection point connecting 401 and 403, and 404 is a first energy feed port of the magnetic resonance wireless power transmission subsystem; as shown in fig. 5, the transmit antenna of the magnetic resonance wireless power foreign object detection subsystem designed for this embodiment can detect foreign objects in the whole system plane, where 501 is the second transmit antenna, 504 is the second energy feed port of the transmit antenna of the magnetic resonance wireless power foreign object detection subsystem, 502 is the second connection point connecting 501 and 503, 503 is the second transmit antenna compensation portion, and point a, point B, point C, point D, point E, point F, point G, point H, point I, point J, point K, point L, point M, point N, and point O represent the detection points when foreign objects are present and when no foreign objects are present. The structure of the first transmitting antenna and the structure of the second transmitting antenna are not fixed, so that the foreign matters can be detected anywhere in the system when the foreign matters exist in the whole system all the time, namely, when the foreign matters exist anywhere in the whole system, the parameters for judging whether the foreign matters exist can be obviously changed, and the changed amplitude values at any places are close to each other.
Fig. 6 is a comparison graph of return loss S11 corresponding to each point (point a, point B, point C, point D, point E, point F, point G, point H, point I, point J, point K, point L, point M, point N, and point O) in fig. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem, and when there is a foreign object in the system, the same value can be maintained in the entire plane, which is approximately-1.65 dB, and when there is a foreign object in the system, the value change in the entire plane is not large, which is approximately-10.7 dB to-10.2 dB, and the change range in the entire plane is not large, but has a significant difference from the value of S11 when there is no foreign object, and thus, the comparison graph can be used as a criterion for determining the presence or absence of a foreign object. As shown in fig. 7, it is a comparison graph of impedance Zin values corresponding to each point (point a, point B, point C, point D, point E, point F, point G, point H, point I, point J, point K, point L, point M, point N, and point O) in fig. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem, including a real part and an imaginary part, which are not changed in the whole plane when there is no foreign object in the system, wherein the real part is about 5.4 omega, the imaginary part is about 20 omega, when foreign matters exist in the magnetic resonance wireless power foreign matter detection subsystem, the variation range of the impedance Zin real part at each point is about 33-34.5 omega, the variation range of the real part at each point in the whole plane is not large, the variation range of the imaginary part is about 18.5-20 omega, and the variation of each point in the plane is not large, although the imaginary part does not change much with no foreign matter, the real part changes obviously, so that whether foreign matter exists can be judged by detecting the change of the impedance value. As shown in fig. 8, fig. 8 is a comparison graph of input current changes corresponding to each point (point a, point B, point C, point D, point E, point F, point G, point H, point I, point J, point K, point L, point M, point N, and point O) in fig. 5 when there is a foreign object and no foreign object in the magnetic resonance wireless power foreign object detection subsystem, when there is a foreign object in the system, the input current flowing through the system in the whole plane is unchanged and is kept at 151mA, when there is a foreign object in the magnetic resonance wireless power foreign object detection subsystem, the input current corresponding to each point in the plane is different, the change range is within 113 mA and 120mA, the difference is obvious compared with that when there is no foreign object, the control circuit can determine whether there is a foreign object in the system according to the series of parameters; the magnetic resonance wireless power foreign matter detection subsystem has an input current acquisition function, when foreign matters exist in the system, the parameters in a circuit passing through the magnetic resonance wireless power foreign matter detection subsystem are changed greatly, the parameters are used as a standard for judging whether the foreign matters exist, whether the change of the parameters in the circuit exceeds the range of a set value is detected, if the change of the parameters exceeds the range of the set value, the foreign matters are considered to exist, otherwise, the foreign matters are judged to be absent; the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the same control circuit; the input current value collected by an input current collecting circuit of the magnetic resonance wireless power transmission foreign matter detection system is transmitted to a control circuit, the control circuit compares the collected value with a set threshold value to judge whether foreign matters exist, and if the judgment result shows that the foreign matters exist, the control circuit disconnects a power supply of a magnetic resonance wireless power transmission subsystem.
The working principle and the process of the invention are as follows: the invention needs to monitor whether foreign matters exist in the wireless charging system in real time, and the two systems work simultaneously based on two systems with different working frequencies; the two systems have different functions, one for wireless power transmission and the other for foreign object detection.
The invention has the beneficial effects that:
(1) the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign matter detection subsystem share the same control circuit or use two control systems capable of two-way communication, so that time delay of information processing and information transmission is reduced, a transmitting circuit of the wireless power transmission system can be protected at the first time when foreign matters are detected, and the purpose of foreign matter detection is achieved better.
(2) The magnetic resonance wireless electric energy transmission subsystem and the magnetic resonance wireless electric energy foreign matter detection subsystem respectively adopt different working frequencies, so that the two systems can work simultaneously, the real-time detection of foreign matters and the timely protection of a transmitting circuit are realized, the two systems have small interference on each other, and the normal work of each other cannot be influenced.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (5)
1. A system for detecting foreign matters and transmitting electric energy in magnetic resonance wireless electric energy transmission is characterized by comprising a magnetic resonance wireless electric energy transmission subsystem and a magnetic resonance wireless electric energy foreign matter detection subsystem which are connected;
the magnetic resonance wireless power foreign matter detection subsystem is used for detecting foreign matters;
the magnetic resonance wireless power transmission subsystem is used for carrying out wireless power transmission according to the detection result of the magnetic resonance wireless power foreign matter detection subsystem and supplying power to the load.
2. The system for magnetic resonance wireless power transmission foreign object detection and power transmission according to claim 1, wherein the magnetic resonance wireless power transmission subsystem and the magnetic resonance wireless power foreign object detection subsystem employ different operating frequencies.
3. The system for foreign object detection and power transmission in magnetic resonance wireless power transmission according to claim 1, wherein the magnetic resonance wireless power transmission subsystem comprises a first control circuit, a first power amplifier, a first impedance matching network, a first transmitting resonant network, a first transmitting antenna, a receiving resonant network, a rectifying and voltage stabilizing circuit and a load which are connected in sequence;
the first control circuit is used for acquiring parameters of the magnetic resonance wireless power transmission subsystem and controlling the magnetic resonance wireless power transmission subsystem to work;
the first power amplifier is used for amplifying the power of the wireless energy and converting direct current power into radio frequency energy;
the first impedance matching network is used for performing impedance transformation and matching the output impedance of the first power amplifier to the input impedance of the first transmitting resonant network;
the first transmitting resonant network and the first transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power transmission subsystem;
the first transmitting antenna is used for transmitting radio frequency energy to a space where the first transmitting antenna is located;
the receiving antenna is used for receiving radio frequency energy;
the receiving antenna and the receiving resonant network form an LC series-parallel resonant circuit which is used for rectifying the radio frequency energy into a direct current signal;
the rectification voltage stabilizing circuit is used for rectifying and stabilizing the voltage of the direct current signal and providing the direct current signal for a load.
4. The system according to claim 3, wherein the magnetic resonance wireless power transmission foreign object detection subsystem comprises a second control circuit, a second power amplifier, a second matching impedance network, a second transmission resonant network and a second transmission antenna which are connected in sequence, and the first control circuit is connected with the second control circuit;
the second control circuit is used for detecting whether foreign matters exist in the magnetic resonance wireless power transmission subsystem or not;
the second power amplifier is used for amplifying the power of the wireless energy and converting direct current power into radio frequency energy;
the second matching impedance network is used for carrying out impedance transformation and matching the output impedance of the second power amplifier to the input impedance of the second transmitting resonant network;
the second transmitting resonant network and the second transmitting antenna form an LC series-parallel resonant circuit and are used for adjusting the working frequency of the magnetic resonance wireless power foreign matter detection subsystem;
the second transmitting antenna is used for transmitting the radio frequency energy to the space where the second transmitting antenna is located.
5. The system according to claim 4, wherein the specific method for detecting the presence of the foreign object by the second control circuit comprises: judging whether the return loss, the impedance Zin and the parameter change value of the input current of the magnetic resonance wireless power foreign matter detection subsystem exceed a set threshold value or not by using a second control circuit, if so, judging that foreign matters exist in the magnetic resonance wireless power transmission subsystem, and disconnecting the power supply of the magnetic resonance wireless power transmission subsystem by using a first control circuit; otherwise, the magnetic resonance wireless power transmission subsystem has no foreign matter and starts the magnetic resonance wireless power transmission subsystem to work by utilizing the first control circuit.
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