CN214755754U - Combined foreign matter detection coil without detection blind area - Google Patents
Combined foreign matter detection coil without detection blind area Download PDFInfo
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- CN214755754U CN214755754U CN202121342739.2U CN202121342739U CN214755754U CN 214755754 U CN214755754 U CN 214755754U CN 202121342739 U CN202121342739 U CN 202121342739U CN 214755754 U CN214755754 U CN 214755754U
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Abstract
The utility model relates to a foreign matter detection technical field in the wireless charging system, specifically disclose a combined foreign matter detection coil of no detection blind area, this combined foreign matter detection coil is formed by M the same character cut in bas-relief shape coil horizontal concatenation in order to regard as a horizontal detecting element, M2N-1, N is more than or equal to 2; each concave coil comprises first convex parts protruding from the left side and the right side and a concave space in the middle; the splicing mode of M concave coils is as follows: n concave coils are transversely arranged side by side, two adjacent first convex parts are combined into a second convex part, and the concave spaces of the rest N-1 concave coils are respectively embedded with N-1 second convex parts; and taking the central rectangular area obtained after splicing as a foreign matter detection area, wherein the foreign matter detection area covers a wireless charging area of the charging system. Under excitation, strong magnetic fields are distributed at all positions in the foreign matter detection area, detection blind areas basically do not exist, and foreign matters can be effectively detected at all positions.
Description
Technical Field
The utility model relates to a foreign matter among the wireless charging system detects technical field, especially relates to a combined foreign matter detection coil of no detection blind area.
Background
When the wireless charging system is charged, a high-frequency alternating magnetic field exists between the coupling mechanisms of the wireless charging system, so that the health of organisms can be damaged to a certain degree, the charging efficiency of the system can be influenced by the mistaken entry of a metal foreign body, or potential safety hazards are caused by heating due to factors such as an eddy current effect. The foreign body detection technology based on the independent detection coil has the characteristics of low cost, strong plasticity and the like, so that the foreign body detection technology is widely applied to a foreign body detection system.
Generally speaking, the structures of the existing independent detection coils are mainly divided into two types, namely circular and rectangular, and when the circular detection coils are spliced, rhombic detection blind areas exist among the coils, so that the existing conventional technology mostly adopts rectangular coils to form a detection array to realize full coverage of a charging area. But this is only a full coverage at the physical level and the effect of the detection depends mainly on its spatial magnetic field distribution. Through simulation and experimental verification, the conventional rectangular detection coil still has certain degrees of blind areas at four corners, as shown in fig. 1-1. The magnetic flux intensity of the rectangular coil is lower near the four corners of the periphery than in the four corners of the center, that is, the detection capability of the region is lower than that of the center coil region, and when some small foreign matters appear in the region, the small foreign matters can not be effectively identified. At present, all positions above a single detection coil of a coil group designed in the common technology can be effectively detected by default, and the coils are arranged on the basis, so that the condition of missing detection exists in practical application, taking four parallel coils as an example, the actual magnetic field distribution of the coils is as shown in fig. 1-2, and the condition that a central area and even a blind area are stacked exists, so that small foreign matters in the area are difficult to detect.
SUMMERY OF THE UTILITY MODEL
The utility model provides a combined foreign matter detection coil of no detection blind area, the technical problem of solution lies in: how to carry out full coverage detection (no detection blind area) on foreign matters in a charging system (a coupling mechanism).
In order to solve the above technical problem, the utility model provides a combined foreign matter detection coil without detection blind area, which is formed by transversely splicing M identical concave coils as a transverse detection unit, wherein M is 2N-1, and N is more than or equal to 2; each concave coil comprises first convex parts protruding from the left side and the right side and a concave space in the middle, each concave coil is formed by sequentially winding a conducting wire from outside to inside or from inside to outside, and excitation introduced into each concave coil enters from the outer lead end or the inner lead end of each concave coil; the splicing mode of M concave coils is as follows: n concave coils are transversely arranged side by side, two adjacent first convex parts are combined into a second convex part, and the concave spaces of the rest N-1 concave coils are respectively embedded with N-1 second convex parts; and taking the central rectangular area obtained after splicing as a foreign matter detection area, wherein the foreign matter detection area covers a wireless charging area of the charging system.
Preferably, when M is 3, the joined lateral detecting unit is used as the smallest combined type foreign object detection coil, and the central rectangular region is suitable for the case where the transmitting coil is small.
Preferably, the combined type foreign matter detection coil without the detection blind area is further formed by longitudinally connecting A transverse detection units, a central rectangular area obtained after connection is used as a foreign matter detection area, and A is more than or equal to 2. The combined foreign body detection coil is suitable for the situation that the transmitting coil is a rectangular coil with a larger structure.
Preferably, the number of zigzag coils of each of the lateral detecting units is the same. In other embodiments, in order to match the structure of the transmitting coil, the number of the zigzag coils and the vertical connection mode of each transverse detection unit are determined according to actual requirements.
Preferably, the number of the zigzag coils of each of the lateral detecting units is 7, and a is 4.
Preferably, the height of the lateral detecting unit is equal to the length of the bottom side of one of the zigzag coils, thereby facilitating calculation of the size of the combined type foreign object detection coil and the size of the central rectangular region thereof to match the structure of the transmitting coil.
The utility model provides a pair of combined foreign matter detection coil of no detection blind area adopts the coil of this kind of opposite sex structure of character cut in bas-relief coil, obtains combined foreign matter detection coil through special concatenation mode, under the excitation, can make and equally divide everywhere cloth in the foreign matter detection region and have stronger magnetic field, does not have the detection blind area basically, and each position can both effectively detect out the foreign matter.
Drawings
Fig. 1-1 is a magnetic field distribution diagram of a conventional single rectangular detection coil provided in the background of the present invention;
fig. 1-2 are magnetic field distribution diagrams of a conventional 4-rectangular detection coil provided by the background art of the present invention;
fig. 2 is a structural diagram of a zigzag coil provided in an embodiment of the present invention;
fig. 3 is a structural diagram of a detection coil unit formed by splicing 3 zigzag coils according to an embodiment of the present invention;
fig. 4 is a structural diagram of a conventional rectangular coil provided in an embodiment of the present invention;
fig. 5 is a schematic view of a magnetic field iso-surface of the detection coil unit and a conventional rectangular coil provided by the embodiment of the present invention;
fig. 6 is a schematic diagram of a foreign object placing position of a detection coil unit and a conventional rectangular coil in an experiment provided by an embodiment of the present invention;
fig. 7 is a structural diagram of a combined foreign object detection coil adapted to a rectangular emission system according to an embodiment of the present invention.
Detailed Description
The following embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are given for illustrative purposes only and are not to be construed as limiting the invention, including the drawings, which are only used for reference and illustration, and do not constitute a limitation to the scope of the invention, since many changes may be made thereto without departing from the spirit and scope of the invention.
In order to carry out the foreign matter detection of no blind area to whole wireless charging area, the embodiment of the utility model provides a combined foreign matter detection coil of no detection blind area is formed by the horizontal concatenation of M the same character cut in bas-relief shape coil as a horizontal detecting element, and M2N-1 is become for 2N ≧ 2. As shown in fig. 2, each of the zigzag coils includes first convex portions 1 protruding on left and right sides and a concave space 2 in the middle. The splicing mode of M concave coils is as follows: n concave coils are transversely arranged side by side, two adjacent first convex parts 1 are combined into a second convex part 3 (refer to fig. 3), and concave spaces 2 of the rest N-1 concave coils are respectively embedded with N-1 second convex parts 3; and taking the central rectangular area obtained after splicing as a foreign matter detection area, wherein the foreign matter detection area covers a wireless charging area of the charging system.
As can be seen from fig. 2, each of the zigzag coils is formed by sequentially winding a conductive wire from the outside and the inside or from the inside and the outside.
A coil obtained by splicing the M-3 coils is used as one detection coil unit (i.e., the smallest combination type foreign object detection coil having the simplest structure), and the configuration thereof is as shown in fig. 3. A. B, C, each of which represents three separate zigzag coils, the respective arrows indicate the input direction of the excitation (the excitation applied to each zigzag coil enters from the outer lead end of each zigzag coil, and the excitation applied to each zigzag coil enters from the inner lead end in a unified manner in other embodiments), and the complete rectangular region in the center of fig. 3 (i.e., the central rectangular region) is taken as the contrast region (foreign object detection region).
The (foreign matter detection region of the) combination type foreign matter detection coil shown in fig. 3 is compared with the equivalent surface of the magnetic field intensity corresponding to the conventional rectangular coil structure shown in fig. 4, as shown in fig. 5. The area framed by the dotted line frame is a contrast area under the same condition, so that an evacuation area with magnetic field distribution obviously appearing at four corners in the common rectangular coil can be seen, and the area really lacks the effective detection capability of foreign matters through experimental verification. In contrast, in the contrast area of the combined foreign object detection coil of the present embodiment, the magnetic field is not completely concentrated in the central area, but becomes a plurality of concentrated points dispersed in the foreign object detection area, and no matter the peripheral four corners or the central random area have a certain detection capability, so that the requirement of detecting the presence or absence of the foreign object can be well satisfied.
Further, in this example, small foreign matters of coin size were added to different positions in each model shown in fig. 5, and the detection capability of the combined foreign matter detection coil shown in fig. 3 was verified by observing the impedance change at each position. Considering the symmetry of the respective structures, foreign matters are placed at the corners, edges and central random regions of the designed detection coil unit and the common rectangular coil, respectively, at a, b and c as shown in fig. 6.
The main data and changes measured by the experiment are shown in the following tables 1 and 2:
TABLE 1 detection coil data change table after foreign matter intervention in coil unit
TABLE 2 coil data change table after foreign matter intervention in conventional rectangular coil
As can be seen from the data in the table, when a foreign object is present at a corner position such as a, the impedance change rate of the coil A is
The conventional rectangular coil has an impedance change rate of
The rate of change of the present design is about 8 times the rate of change of the latter; similarly, the rate of change of the impedance of coil A at b is
The conventional rectangular coil has an impedance change rate of
The former rate of change is about 3.33 times the latter; and the impedance of the coil B at c is more pronounced with a rate of change of
The conventional rectangular coil has an impedance change rate of
The latter rate of change is about 1.5 times the former.
It can be seen that the areas with the strongest detection capability of the conventional rectangular coil are the central four-corner areas, the magnetic field distribution of the conventional rectangular coil is concentrated near the areas, the detection capability of the partial areas is sensitive enough and overflows to a certain degree for the purpose of whether foreign matters exist, the magnetic fields in the peripheral four-corner areas are sparse enough, extremely serious detection blind areas exist, and the basic requirement of accurate detection cannot be met. Due to the structural characteristics of the magnetic field detection device, the magnetic field is not completely concentrated in the central area, but a plurality of concentrated points are dispersed in the detection area, and the detection capability is certain no matter in four peripheral corners or a central random area, so that the requirement of detecting whether foreign matters exist can be well met.
Note: the unit 1 of the excitation setting in the simulation is adopted, so that the change rates of the two structures are lower, and the actual situation is improved.
The detection coil unit shown in fig. 3 is a small-sized structure, which can avoid the problem that a large-sized coil causes serious interference to a charging system. To realize non-blind-area full-coverage detection of a charging system with a larger wireless charging area, a central rectangular area obtained after splicing can be made to be paved in the whole wireless charging area based on the principle that detection coil units shown in a splicing chart 3 are the same, so that non-blind-area detection is realized. For example, first, M (7) identical zigzag coils are transversely spliced to form one transverse detection unit, and then a (4) transverse detection units are longitudinally connected to obtain the combined foreign object detection coil shown in fig. 7, wherein the central rectangular region serves as a foreign object detection region and covers the wireless charging region.
In other embodiments, the combined foreign object detection coil may depend on the structure of the actual charging system, and there may be multiple ways to lay the detection devices of the same system. Fig. 7 is a view illustrating a layout form of a combined type foreign object detection coil, by way of example only, which is the most common rectangular emission system.
To sum up, the embodiment of the utility model provides a pair of combined foreign matter detection coil of no detection blind area, adopt the coil of this kind of opposite sex structure of reentrant shape coil, obtain combined foreign matter detection coil through special concatenation mode, under the excitation, can make and equally divide everywhere in the foreign matter detection region and distribute and have stronger magnetic field, there is not the detection blind area basically, the accessible gathers the kind information and the positional information of effectively detecting out the foreign matter of the electromagnetic information (impedance information, amplitude information and phase information etc.) of each reentrant shape coil in the combined foreign matter detection coil, still can resist environmental disturbance to a certain extent, be in different power promptly, also can realize the effective detection to the foreign matter in the charging system under the frequency.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (6)
1. The utility model provides a combined foreign matter detection coil of no detection blind area which characterized in that: m identical concave coils are transversely spliced to serve as a transverse detection unit, wherein M is 2N-1, and N is more than or equal to 2; each concave coil comprises first convex parts protruding from the left side and the right side and a concave space in the middle, each concave coil is formed by sequentially winding a conducting wire from outside to inside or from inside to outside, and excitation introduced into each concave coil enters from the outer lead end or the inner lead end of each concave coil; the splicing mode of M concave coils is as follows: n concave coils are transversely arranged side by side, two adjacent first convex parts are combined into a second convex part, and the concave spaces of the rest N-1 concave coils are respectively embedded with N-1 second convex parts; and taking the central rectangular area obtained after splicing as a foreign matter detection area, wherein the foreign matter detection area covers a wireless charging area of the charging system.
2. The combination type foreign matter detection coil without detection dead zone according to claim 1, characterized in that: and M is 3.
3. The combination type foreign matter detection coil without detection dead zone according to claim 1, characterized in that: a transverse detection units are longitudinally connected, and a central rectangular area obtained after connection is used as a foreign matter detection area, wherein A is more than or equal to 2.
4. The combination type foreign matter detection coil without detection dead zone according to claim 3, characterized in that: the number of the concave coils of each transverse detection unit is the same.
5. The combination type foreign matter detection coil without detection dead zone according to claim 4, characterized in that: the number of the concave coils of each transverse detection unit is 7, and A is 4.
6. The combination type foreign matter detection coil without a detection dead zone according to any one of claims 1 to 5, wherein: the height of the transverse detection unit is equal to the length of the bottom edge of one of the concave coils.
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| CN202121342739.2U CN214755754U (en) | 2021-06-17 | 2021-06-17 | Combined foreign matter detection coil without detection blind area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113391360A (en) * | 2021-06-17 | 2021-09-14 | 丰宇宸 | Combined foreign matter detection coil without detection blind area and detection method thereof |
| CN116613902A (en) * | 2023-07-20 | 2023-08-18 | 南京航空航天大学 | Wireless foreign matter detection device and wireless charging system that charges |
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2021
- 2021-06-17 CN CN202121342739.2U patent/CN214755754U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113391360A (en) * | 2021-06-17 | 2021-09-14 | 丰宇宸 | Combined foreign matter detection coil without detection blind area and detection method thereof |
| CN113391360B (en) * | 2021-06-17 | 2024-01-26 | 丰宇宸 | Combined foreign matter detection coil without detection blind area and detection method thereof |
| CN116613902A (en) * | 2023-07-20 | 2023-08-18 | 南京航空航天大学 | Wireless foreign matter detection device and wireless charging system that charges |
| CN116613902B (en) * | 2023-07-20 | 2023-09-26 | 南京航空航天大学 | Wireless foreign matter detection device and wireless charging system that charges |
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