CN104242477A - Wireless electric energy transmission system with impurity detection function and impurity detection method - Google Patents
Wireless electric energy transmission system with impurity detection function and impurity detection method Download PDFInfo
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- CN104242477A CN104242477A CN201310254035.3A CN201310254035A CN104242477A CN 104242477 A CN104242477 A CN 104242477A CN 201310254035 A CN201310254035 A CN 201310254035A CN 104242477 A CN104242477 A CN 104242477A
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Abstract
The invention discloses a wireless electric energy transmission system with an impurity detection function. The wireless electric energy transmission system with the impurity detection function comprises a transmitting end and a receiving end. The transmitting end is provided with a primary coil. The receiving end is provided with a secondary coil. The secondary coil is connected with a first capacitor in parallel. The transmitting end is further provided with a detection coil. A part of the detection coil or the whole detection coil is located on the periphery of the primary coil. The detection coil is connected with a current transformer. The primary coil is connected with a first switch in series to form a first cascade body. The detection coil is connected with a second switch in series to form a second cascade body. One end of the first cascade body and one end of the second cascade body are both connected with a second capacitor in series. The first cascade body is connected with the second cascade body in parallel. The wireless electric energy transmission system with the impurity detection function can be a high-power system, and is simple in structure, easy to realize and capable of remarkably improving the sensibility, accuracy and reliability in the impurity detection process.
Description
Technical field
The present invention relates to radio energy transmission system, particularly relate to a kind of there is foreign bodies detection function radio energy transmission system and adopt radio energy transmission system to carry out the method for foreign bodies detection.
Background technology
When there is metallic foreign body between the primary coil in radio energy transmission system and secondary coil, can produce eddy current, not only energy loss is large, but also because of eddy-current heating, can produce potential safety hazard.Therefore, before wireless transmitting system carries out delivery of electrical energy, usually foreign bodies detection will be carried out.
At present, common foreign matter detecting method power loss method and primary current detection method.Wherein, power loss method mainly by calculating the received power difference of the transmitted power of transmitting terminal and receiving terminal compared with the power of system autophage, thus judges whether the existence of foreign matter.Primary current detection method mainly by the detection electric current of primary coil and the threshold values of setting being compared, has judged whether that foreign matter exists.Its principle is: when there being foreign matter to exist, because foreign matter need consume part energy, therefore when load-receipt energy is definite value, transmitting terminal will send more energy, the electric current in primary coil will certainly be caused to increase, therefore only need to set certain threshold values according to normal current value, comparing of electric current just can judge between primary coil and secondary coil, whether have foreign matter to exist by threshold values with detection.
Though above-mentioned two kinds of foreign matter detecting methods have higher sensitivity, but be not all suitable for the foreign bodies detection of high-power wireless electric energy transmission system, reason be power less time, the ratio that the power of foreign matter consumption accounts for transmitting terminal transmitted power is great, cause the amplitude of curent change in primary coil also large, therefore adopt above-mentioned two kinds of modes all very easily to detect the existence of foreign matter.On the contrary, in high-power system, the proportion that the power of foreign matter consumption accounts for transmitting terminal transmitted power is minimum, causes the amplitude of curent change in primary coil also little, the existence of foreign matter on the power of system and the impact of current parameters small.
Summary of the invention
In order to overcome foreign bodies detection difficulty in the use procedure of existing high-power wireless electric energy transmission system, and existing detection means applies to the lower defect of sensitivity in high-power situation, technical problem to be solved by this invention is that proposing one has foreign bodies detection function radio energy transmission system, be particularly useful for the situation that radio energy transmission system is high-power system, its structure is simple, is easy to realize.
The technical problem that the present invention also will solve is to propose a kind of foreign matter detecting method, effectively can improve the sensitivity in foreign bodies detection process, accuracy and reliability.
For reaching this object, the present invention by the following technical solutions:
One has foreign bodies detection function radio energy transmission system, comprise transmitting terminal and receiving terminal, described transmitting terminal is provided with primary coil, described receiving terminal is provided with secondary coil, described secondary coil and the first Capacitance parallel connection, described transmitting terminal is also provided with magnetic test coil, and part or all of described magnetic test coil is positioned at the periphery of described primary coil.
Be preferably, the coil diameter of described magnetic test coil is greater than the coil diameter of described primary coil.
Be preferably, described magnetic test coil is connected with current transformer.
Be preferably, described primary coil and the first switch in parallel, form the first concatermer, and described magnetic test coil is in parallel with second switch, forms the second concatermer, and described first concatermer is in parallel with described second concatermer.
Be preferably, one end of described first concatermer and one end of described second concatermer all with the second capacitances in series.
For having a foreign matter detecting method for foreign bodies detection function radio energy transmission system, implement as follows:
S00: power on to transmitting terminal.
S10: whether the controller of the inside of described radio energy transmission system has receiving terminal to exist with predetermined cycle detection, if without receiving terminal, enters S20 step; If there is receiving terminal, described radio energy transmission system is in the state of being waken up, and enters S30 step;
S20: described radio energy transmission system enters standby mode, is in and treats wake-up states;
S30: described radio energy transmission system enters detecting pattern, to whether there is foreign matter between described primary coil and described secondary coil detects;
S40: under described detecting pattern, described controller controls described current transformer and detects magnitude of voltage on described magnetic test coil, judges whether to there is foreign matter, if there is foreign matter, enters S20 step, if there is not foreign matter, enter S50 step according to magnitude of voltage;
S50: described radio energy transmission system enters mode of operation, described primary coil carries out delivery of electrical energy to described secondary coil.
Further, step S40 implements as follows:
S401: described current transformer detects the current detection value on described magnetic test coil, and described current detection value is changed into voltage detecting value V;
S402: predeterminated voltage threshold values Δ V, the comparator more described voltage detecting value V of described controller inside and described threshold voltage Δ V and Initial Voltage Value V
0the size of sum;
S403: if V > Δ V+V
0, enter S20 step, give the alarm, if V≤Δ V+V
0, enter S50 step.
Further, when not having foreign matter in described radio energy transmission system, described current transformer detects the electric current initial value on described magnetic test coil, and described electric current initial value is changed into Initial Voltage Value V
0.
Beneficial effect of the present invention is: the present invention has set up magnetic test coil in radio energy transmission system, the primary coil of radio energy transmission system is no longer relied on when making foreign matter detector carry out foreign bodies detection, namely no matter radio energy transmission system is high-power or low-power system, all can not have an impact to foreign bodies detection process.A kind of foreign matter detecting method for having foreign bodies detection function radio energy transmission system, by setting voltage threshold values and Initial Voltage Value, after radio energy transmission system environment for use is changed, Initial Voltage Value can upgrade at any time, and keep fixing threshold voltage, thus improve sensitivity in foreign bodies detection process, accuracy and reliability.
Accompanying drawing explanation
Fig. 1 is the main circuit diagram with foreign bodies detection function radio energy transmission system that the specific embodiment of the invention provides;
Fig. 2 is the structural representation of the transmitting terminal that the specific embodiment of the invention provides;
Fig. 3 is the flow chart of the foreign matter detecting method that the specific embodiment of the invention provides;
Fig. 4 is the flow chart of the detecting pattern that the specific embodiment of the invention provides.
In figure:
1, primary coil; 2, secondary coil; 3, the first electric capacity; 4, magnetic test coil; 5, the first switch; 6, second switch; 7, the second electric capacity.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, be the main circuit diagram with foreign bodies detection function radio energy transmission system provided in the present embodiment.
One has foreign bodies detection function radio energy transmission system, comprises transmitting terminal and receiving terminal, and described transmitting terminal is provided with primary coil 1 and magnetic test coil 4, and described receiving terminal is provided with secondary coil 2.Described magnetic test coil 4 is connected with current transformer, and described current transformer for detecting current signal on magnetic test coil 4 or current value, and converts current signal to voltage signal.
Magnetic test coil has been set up in radio energy transmission system, the primary coil of radio energy transmission system is no longer relied on when making foreign matter detector carry out foreign bodies detection, namely no matter radio energy transmission system is high-power or low-power system, all can not have an impact to foreign bodies detection process
Described primary coil 1 is connected with the first switch 5, forms the first concatermer; Described magnetic test coil 4 is connected with second switch 6, forms the second concatermer.Described first concatermer is in parallel with described second concatermer, all connects with the second electric capacity 7 with one end of described second concatermer in one end of described first concatermer.Described secondary coil 2 is in parallel with the first electric capacity 3.
Wherein, the open and-shut mode of described first switch 5 determines whether described primary coil 1 works, and the open and-shut mode of described second switch 6 determines whether described magnetic test coil 4 works.
As shown in Figure 2, be the structural representation of the transmitting terminal provided in the present embodiment.
Described magnetic test coil 4 and described primary coil 1 position relationship can be the peripheries that part or all of described magnetic test coil 4 is positioned at described primary coil 1, and namely the coil diameter of described magnetic test coil 4 is greater than the coil diameter of described primary coil 1.As can be seen from the figure, the optimal way of the present embodiment is whole peripheries being positioned at described primary coil 1 of described magnetic test coil 4, makes the surveyed area of described magnetic test coil 4 cover the working region of described primary coil 1 like this.
As shown in Figure 3, be the flow chart of the foreign matter detecting method provided in the present embodiment.
For having a foreign matter detecting method for foreign bodies detection function radio energy transmission system, implement as follows:
S00 step: power on to the transmitting terminal of radio energy transmission system, now, the first switch 5 all disconnects with second switch 6.
S10 step: whether the controller of the inside of described radio energy transmission system has receiving terminal to exist with predetermined cycle detection, if without receiving terminal, enters S20 step; If there is receiving terminal, described radio energy transmission system is in the state of being waken up, and enters S30 step.
S20 step: described radio energy transmission system enters standby mode, is in and treats wake-up states.
S30 step: described radio energy transmission system enters detecting pattern, the first switch 5 disconnects, and second switch 6 closes, and to whether there is foreign matter between described primary coil 1 and described secondary coil 2 detects.The operating frequency of described magnetic test coil 4 differs comparatively large with the operating frequency of described secondary coil 2, the operating frequency of usual described magnetic test coil 4 is 110K, and the operating frequency of described secondary coil 2 is 20K.Because frequency phase-difference is comparatively large, the energy that secondary coil 2 described in testing process absorbs is less, therefore the electric energy that testing process consumes is also little.In addition, because the operating frequency of described magnetic test coil 4 is higher, it is more obvious that frequency height foreign matter produces the effect of eddy current, is more easily detected, therefore adopt independently magnetic test coil 4 to lead to sensitivity and accuracy that high-frequency electrical energy effectively improves foreign bodies detection.
S40 step: under described detecting pattern, the current value that described controller controls on the described magnetic test coil 4 of described current transformer detection judges whether to there is foreign matter, if there is foreign matter, enters S20 step, if there is not foreign matter, enters S50 step.
S50 step: described radio energy transmission system enters mode of operation, the first switch 5 closes, and second switch 6 disconnects, and described primary coil 1 carries out delivery of electrical energy to described secondary coil 2.
As can be seen from above-mentioned steps, before carrying out delivery of electrical energy, just first carry out foreign bodies detection, therefore because of the detecting reliability of the variable effect magnetic test coil 4 of load, the accuracy of foreign bodies detection can not have been improve.
As shown in Figure 4, be the flow chart of the detecting pattern provided in the present embodiment.
Under detecting pattern, implement as follows:
S401 step: described current transformer detects the current detection value on described magnetic test coil 4, and described current detection value is changed into voltage detecting value V;
S402 step: predeterminated voltage threshold values Δ V, the comparator more described voltage detecting value V of described controller inside and described threshold voltage Δ V and Initial Voltage Value V
0the size of sum;
S403 step: if V > Δ V+V
0, enter S20 step, give the alarm, if V≤Δ V+V
0, enter S50 step.
Wherein, Initial Voltage Value V
0refer in described radio energy transmission system that when not having foreign matter, described current transformer detects the electric current initial value on described magnetic test coil 4, and by Initial Voltage Value that described electric current initial value changes into.
Therefrom can find out, by setting voltage threshold values and Initial Voltage Value in radio energy transmission system, after radio energy transmission system environment for use is changed, Initial Voltage Value can upgrade at any time, and keep fixing threshold voltage, thus improve sensitivity in foreign bodies detection process, accuracy and reliability.
The present invention is described by preferred embodiment, and those skilled in the art know, without departing from the spirit and scope of the present invention, can carry out various change or equivalence replacement to these characteristic sum embodiments.The present invention is not by the restriction of specific embodiment disclosed herein, and other embodiments fallen in the claim of the application all belong to the scope of protection of the invention.
Claims (9)
1. one kind has foreign bodies detection function radio energy transmission system, comprise transmitting terminal and receiving terminal, described transmitting terminal is provided with primary coil (1), described receiving terminal is provided with secondary coil (2), it is characterized in that: described transmitting terminal is also provided with magnetic test coil (4), part or all of described magnetic test coil (4) is positioned at the periphery of described primary coil (1).
2. according to claim 1 have foreign bodies detection function radio energy transmission system, it is characterized in that, described secondary coil and the first Capacitance parallel connection.
3. according to claim 1 have foreign bodies detection function radio energy transmission system, it is characterized in that:
Described primary coil (1) is connected with the first switch (5), forms the first concatermer;
Described magnetic test coil (4) is connected with second switch (6), forms the second concatermer;
Described first concatermer is in parallel with described second concatermer.
4. according to claim 3 have foreign bodies detection function radio energy transmission system, it is characterized in that: all connect with the second electric capacity (7) with one end of described second concatermer in one end of described first concatermer.
5. according to any one of claim 1-4, have foreign bodies detection function radio energy transmission system, it is characterized in that, the coil diameter of described magnetic test coil (4) is greater than the coil diameter of described primary coil (1).
6. according to claim 5 have foreign bodies detection function radio energy transmission system, and it is characterized in that, described magnetic test coil (4) is connected with current transformer.
7. for the foreign matter detecting method with foreign bodies detection function radio energy transmission system described in any one of claim 1-6, it is characterized in that, implement as follows:
S00: power on to transmitting terminal;
S10: whether the controller of described radio energy transmission system inside has receiving terminal to exist with predetermined cycle detection, if without receiving terminal, enters S20 step; If there is receiving terminal, described radio energy transmission system is in the state of being waken up, and enters S30 step;
S20: described radio energy transmission system enters standby mode, is in and treats wake-up states;
S30: described radio energy transmission system enters detecting pattern, to whether there is foreign matter between described primary coil (1) and described secondary coil (2) detects;
S40: under described detecting pattern, described controller controls described current transformer and detects magnitude of voltage on described magnetic test coil (4), judges whether to there is foreign matter, if there is foreign matter, enter S20 step, if there is not foreign matter, enter S50 step according to magnitude of voltage;
S50: described radio energy transmission system enters mode of operation, described primary coil (1) carries out delivery of electrical energy to described secondary coil (2).
8. foreign matter detecting method according to claim 7, is characterized in that, step S40 implements as follows:
S401: described current transformer detects the current detection value on described magnetic test coil (4), and described current detection value is changed into voltage detecting value V;
S402: predeterminated voltage threshold values Δ V, the comparator more described voltage detecting value V of described controller inside and described threshold voltage Δ V and Initial Voltage Value V
0the size of sum;
S403: if V > Δ V+V
0, enter S20 step, give the alarm, if V≤Δ V+V
0, enter S50 step.
9. foreign matter detecting method according to claim 8, it is characterized in that, when not having foreign matter in described radio energy transmission system, described current transformer detects the electric current initial value on described magnetic test coil (4), and described electric current initial value is changed into Initial Voltage Value V
0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310254035.3A CN104242477A (en) | 2013-06-24 | 2013-06-24 | Wireless electric energy transmission system with impurity detection function and impurity detection method |
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|---|---|---|---|
| CN201310254035.3A CN104242477A (en) | 2013-06-24 | 2013-06-24 | Wireless electric energy transmission system with impurity detection function and impurity detection method |
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| WO2016138754A1 (en) * | 2015-03-04 | 2016-09-09 | 中兴通讯股份有限公司 | Primary side installed on ground, and foreign object detection method and apparatus |
| CN108390475A (en) * | 2017-01-13 | 2018-08-10 | 三星电机株式会社 | Foreign bodies detection circuit and use its wireless power sending device |
| CN109001821A (en) * | 2018-04-16 | 2018-12-14 | 上海交通大学 | High-precision foreign matter detection system and method in radio energy transmission system |
| CN109478800A (en) * | 2016-07-29 | 2019-03-15 | 索尼半导体解决方案公司 | Feed system |
| CN110146927A (en) * | 2019-05-16 | 2019-08-20 | 京东方科技集团股份有限公司 | Charging system, foreign matter detecting method and component, charge control method and device |
| CN110536811A (en) * | 2017-06-21 | 2019-12-03 | 奥迪股份公司 | The component of induction type energy transform device with object identification and method for running induction type energy transform device |
| WO2023137979A1 (en) * | 2022-01-24 | 2023-07-27 | 佛山市顺德区美的电子科技有限公司 | Foreign object detection method and apparatus, household appliance and air conditioning system |
| US11796709B2 (en) | 2018-06-19 | 2023-10-24 | Huawei Technologies Co., Ltd. | Detection coil, detection apparatus, and detection system |
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