CN109787376B - Inductive power transfer metal foreign matter detection system and method - Google Patents
Inductive power transfer metal foreign matter detection system and method Download PDFInfo
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- CN109787376B CN109787376B CN201910023014.8A CN201910023014A CN109787376B CN 109787376 B CN109787376 B CN 109787376B CN 201910023014 A CN201910023014 A CN 201910023014A CN 109787376 B CN109787376 B CN 109787376B
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Abstract
The invention discloses a system and a method for detecting metallic foreign matters in inductive power transmission, which relate to the technical field of inductive power transmission, wherein the system comprises: the invention relates to a charging device, which comprises a first coil group and a first voltage detection circuit, wherein the first coil group comprises at least one induction coil pair, the output end of the induction coil pair is connected with the input end of the first voltage detection circuit, the induction coil pair comprises a first induction coil and a second induction coil, the tail end of the first induction coil is connected with the head end of the second induction coil, the tail end of the first induction coil and the second induction coil are crossed at the edge area of the induction coil pair, so that magnetic fields generated by the first induction coil and the second induction coil have fixed vector difference in normal state.
Description
Technical Field
The invention relates to the technical field of inductive power transmission, in particular to a system and a method for detecting metallic foreign matters in inductive power transmission.
Background
The inductive power transfer (Inductive Power Transfer, IPT) technology utilizes the electromagnetic induction principle to transfer power from a power supply end to an electric equipment end in a non-contact manner, thereby realizing wireless power transfer, and having the advantages of safety, reliability, flexibility, convenience, environmental friendliness, all-weather operation and the like, and has received wide attention in recent years. However, when metallic foreign matter (such as metal chips, coins, cans, etc.) enters an energy transmission region constituted by the transmitting coil and the receiving coil, it is possible to hinder energy transmission or reduce energy transmission efficiency, even to cause a combustion accident due to the metallic foreign matter being continuously heated up. Therefore, in order for the system to operate safely and efficiently, it is necessary to invent a system and method that will accurately detect metallic foreign objects when they enter the energy transmission region.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, it is an object of the present invention to provide a system capable of detecting metallic foreign matter.
To this end, a second object of the present invention is to provide a method that can detect metallic foreign matter.
The technical scheme adopted by the invention is as follows:
an inductive power transfer metallic foreign object detection system comprising: the induction coil pair comprises a first induction coil and a second induction coil, the tail end of the first induction coil is connected with the head end of the second induction coil, the tail end of the first induction coil and the second induction coil are crossed in the edge area of the induction coil pair, and the magnetic fields generated by the first induction coil and the second induction coil have fixed vector differences in normal state.
Further, the first coil group includes 1 st to nth coil pairs, a first induction coil of the ith coil pair is disposed inside a first induction coil of the ith-1 st induction coil pair, a second induction coil of the ith coil pair is disposed inside a second induction coil of the ith-1 st induction coil pair, and i=2, 3 … … N.
Further, the induction coil assembly comprises at least one induction coil pair, the output end of the induction coil pair is connected with the input end of the second voltage detection circuit, and the first coil assembly is overlapped with the second coil assembly in position and is perpendicular to the direction of the output end.
Further, the second coil group includes 1 st to M-th coil pairs, a first induction coil of a j-th coil pair is disposed inside a first induction coil of a j-1 th induction coil pair, a second induction coil of the j-th coil pair is disposed inside a second induction coil of the j-1 th induction coil pair, j=2, 3 … … M.
Further, the first voltage detection circuit comprises a first multi-path electronic switch, a first differential amplifier and a first bipolar voltage collector, wherein the output end of the first coil group is connected with the input end of the first multi-path electronic switch, the output end of the first multi-path electronic switch is connected with the input end of the first differential amplifier, and the output end of the first differential amplifier is connected with the input end of the first bipolar voltage collector.
Further, the second voltage detection circuit comprises a second multi-path electronic switch, a second differential amplifier and a second bipolar voltage collector, the output end of the second coil group is connected with the input end of the second multi-path electronic switch, the output end of the second multi-path electronic switch is connected with the input end of the second differential amplifier, and the output end of the second differential amplifier is connected with the input end of the second bipolar voltage collector.
Further, the shapes and the sizes of the first induction coil and the second induction coil are the same, so that the fixed vector difference of the magnetic fluxes generated by the first induction coil and the second induction coil is 0 in a normal state.
Further, the first coil group is matched with the shape of a charging induction area of the induction power transmission system.
The invention also discloses a method for detecting the metal foreign matters, which comprises the step of adopting a first voltage detection circuit to detect whether the output voltage of the first coil group exceeds a preset value so as to judge whether the first coil group contains the metal foreign matters and/or the positions of the metal foreign matters.
Further, the method further comprises a second coil group and a second voltage detection circuit, and the method further comprises detecting the output voltage of the second voltage detection circuit to determine the two-dimensional position of the metal foreign body.
The beneficial effects of the invention are as follows: according to the invention, the first voltage detection circuit is adopted to measure the voltage value generated by the induction coil pair in the first coil group, so that whether the charging area has metal foreign matters is judged, the problem that potential safety hazards possibly occur due to the existence of the metal foreign matters in the charging area in the prior art is solved, and the charging device is simple in structure and convenient to use.
In addition, the invention also provides a second coil group and a second voltage detection circuit, and the position of the foreign matter is further positioned by comprehensively comparing the output results of the first voltage detection circuit and the second voltage detection circuit.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of an inductive power transfer metallic foreign object detection system according to the present invention;
FIG. 2 is a schematic diagram of a first embodiment of an inductive coil pair of an inductive power transfer foreign metal detection system according to the present invention;
FIG. 3 is a schematic diagram illustrating a second embodiment of an inductive power transfer foreign metal detection system according to the present invention;
FIG. 4 is a schematic functional structure diagram of a third embodiment of an inductive power transfer foreign metal detection system according to the present invention;
FIG. 5 is a schematic functional diagram of a fourth embodiment of an inductive power transfer foreign metal detection system according to the present invention;
FIG. 6 is a flowchart of a first embodiment of a method for detecting metallic foreign matter for inductive power transfer according to the present invention;
FIG. 7 is a flowchart of a second embodiment of a method for detecting metallic foreign matter in inductive power transfer according to the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an inductive power transfer foreign metal detection system according to the present invention, including: the first coil group at least comprises an induction coil pair, and the output end of the induction coil pair is connected with the input end of the first voltage detection circuit.
The first coil group is arranged above the charging magnetic field, when metal foreign matters fall in a certain induction coil pair in the first coil group, the voltage generated by the induction coil pair changes, and the voltage change can be detected through the first voltage detection circuit, so that the fact that the foreign matters fall in the range of the first coil group 1 is determined.
As shown in fig. 2, the induction coil pair includes a first induction coil 4 and a second induction coil 5, the first induction coil 4 and the second induction coil 5 include a head end and a tail end, respectively, the tail end 42 of the first induction coil and the head end 43 of the second induction coil are connected through a wire 5, and the tail end 42 of the first induction coil and the second induction coil form an intersection at an edge region of the induction coil pair, so that magnetic fields generated by the first induction coil and the second induction coil have a fixed vector difference in a normal state.
The design that the first induction coil 4 and the second induction coil 5 are crossed at the edge of the induction coil pair can reduce detection blind areas in a charging area and improve detection efficiency.
Specifically, the first coil group includes 1 st to nth coil pairs, the first induction coil of the ith coil pair is disposed inside the first induction coil of the i-1 st induction coil pair, the second induction coil of the ith coil pair is disposed inside the second induction coil of the i-1 th induction coil pair, and the i=2, 3 … … N.
As shown in fig. 1, the embodiment includes a first induction coil pair 1 and a second induction coil pair 2, where the first induction coil and the second induction coil of the second induction coil pair 2 are respectively located at the inner sides of the first induction coil pair, so that the two induction coils of the same coil pair are as far as possible, and the probability that foreign matters cannot be detected due to symmetric distribution along the two coils of the same coil pair can be effectively reduced.
As shown in fig. 2, for convenience in calculation, the areas of the first induction coil 4 and the second induction coil 5 are set to be the same, when in use, the first induction coil 4 and the second induction coil 5 are symmetrically placed in a magnetic field, the magnitudes of magnetic fluxes passing through the first induction coil 4 and the second induction coil 5 are the same, the current directions are opposite, and the voltage difference value output by the first induction coil 4 and the second induction coil 5 is zero.
When the first voltage detection circuit detects that the junction voltage of the induction necklace pair is larger than 0V, the induction necklace pair is proved to have foreign matters falling.
In practical application, due to the reasons of processing errors of the detection coil pair, processing errors of the transmitting coil, errors of the detection circuit, and the like, the magnetic field distribution of the first induction coil 4 and the second induction coil 5 may not be completely the same, so as to generate a certain tiny voltage difference, wherein the voltage difference is a first preset value for judging whether foreign matters fall in the coil pair, and when the output voltage of the induction coil pair is greater than the preset value, the foreign matters are proved to fall.
As shown in fig. 3, the first voltage detection circuit includes a first multi-path electronic switch, a first differential amplifier, and a first bipolar voltage collector, where an output end of the first coil set is connected to an input end of the first multi-path electronic switch, an output end of the first multi-path electronic switch is connected to an input end of the first differential amplifier, and an output end of the first differential amplifier is connected to an input end of the first bipolar voltage collector.
The first multi-path electronic switch is used for controlling to switch the coil pair output to the first differential amplifier, the first differential amplifier is used for amplifying the output signal input to the first differential amplifier, the first bipolar voltage collector is used for judging the magnitude and the direction of the voltage difference, when the voltage is positive and larger than a first threshold value, the metal foreign matters are located in the area where the first induction coil 4 is located, when the voltage is negative and larger than the first threshold value, the metal foreign matters are located in the area where the second induction coil 5 is located, when the voltage is positive and larger than the first threshold value, the metal foreign matters are located in the area where the first induction coil 4 is located, and the voltage of the induction coil pair is alternately output to the first differential amplifier and the first bipolar voltage collector through the first multi-path electronic switch, so that the hardware cost can be reduced, and the hardware practical efficiency can be improved.
As shown in fig. 4, in order to further determine the position of the metal foreign body, in another embodiment, the apparatus further includes a second coil group and a second voltage detection circuit, where the second coil group includes at least one induction coil pair, an output end of the induction coil pair is connected to an input end of the second voltage detection circuit, and the first coil group overlaps with the position of the second coil group and is perpendicular to the direction of the output end.
The second coil group comprises a1 st to an M th coil pairs, a first induction coil of the j-1 st coil pair is arranged on the inner side of a first induction coil of the j-1 st induction coil pair, a second induction coil of the j-1 st coil pair is arranged on the inner side of a second induction coil of the j-1 st induction coil pair, and j=2 and 3 … … M.
The second coil set in this embodiment includes a first coil pair (B1-1, B1-2) and a second coil pair (B2-1, B2-2), wherein the first induction coil arrangement B2-1 of the second coil pair (B2-1, B2-2) is arranged inside the first induction coil B1-1 of the first coil pair (B1-1, B1-2), and the second induction coil arrangement B2-2 of the second coil pair (B2-1, B2-2) is arranged inside the second induction coil B1-2 of the first coil pair (B1-1, B1-2).
Specifically, the second voltage detection circuit includes a second multi-path electronic switch, a second differential amplifier, and a second bipolar voltage collector, an output end of the second coil set is connected to an input end of the second multi-path electronic switch, an output end of the second multi-path electronic switch is connected to an input end of the second differential amplifier, and an output end of the second differential amplifier is connected to an input end of the second bipolar voltage collector.
In accordance with the principle, the falling position of the metal foreign matter can be further judged through the second bipolar voltage acquisition circuit and the second multi-path control switch, when the switch of the coil pair controlled by the first multi-path electronic switch (A1-1 and A1-2) is conducted and the output of the first bipolar voltage acquisition device is positive and larger than a first preset value, the metal foreign matter can be judged to fall in the area of the coil A1-1, and further, when the switch of the coil pair controlled by the second multi-path electronic switch (B1-1 and B1-2) is conducted, the output of the second bipolar voltage acquisition device is negative and the absolute value is larger than a second preset value, the metal foreign matter can be judged to be positioned in the range of the coil B1-2, and in conclusion, the metal foreign matter can be judged to fall at the junction of the coil A1-1 and the coil B1-2.
As shown in fig. 5, the shapes of the induction coils in the first coil set and the second coil set can be flexibly set according to the needs, and fig. 5 is a schematic diagram of the first coil set and the second coil set fitting the circular detection area when the charging induction area is circular, and the principle is exactly the same as the above.
As shown in fig. 6, the invention further provides a method for detecting metallic foreign matters in inductive power transfer, which comprises the following steps:
s2, detecting whether the output voltage of the first coil set exceeds a preset value by adopting a first voltage detection circuit, if so, the first coil set contains metal foreign matters, and the preset value is the output voltage when no foreign matters exist in the induction coil pair.
A specific coil which can be dropped by foreign matters according to the positive and negative values of the voltage.
S4, detecting the output voltage of the second voltage detection circuit to determine the specific position of the metal foreign body.
When the metal foreign matter is confirmed, the second voltage detection circuit is conducted, so that the detection efficiency can be improved, and resources are saved.
As shown in fig. 7, in another embodiment, the method includes the steps of:
s1, controlling induction coil pairs in the first coil group to be sequentially conducted by adopting a first multi-path electronic switch;
s2, detecting whether the output voltage of the first coil set exceeds a first preset value by adopting a first voltage detection circuit, and if so, entering a step S3.
S3, controlling induction coil pairs in the second coil group to be sequentially conducted by adopting a second multi-path electronic switch;
s4, detecting the output voltage of the second voltage detection circuit to determine the specific position of the metal foreign body.
Through setting up first multichannel electronic switch and second multichannel electronic switch and switching on in turn, can reduce hardware cost, improve hardware availability factor.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (4)
1. An inductive power transfer metallic foreign object detection system, applied to an inductive power transfer system, comprising: the device comprises a first coil group and a first voltage detection circuit, wherein the first coil group comprises at least one coil pair, the output end of the coil pair is connected with the input end of the first voltage detection circuit, the coil pair comprises a first induction coil and a second induction coil, the tail end of the first induction coil is connected with the head end of the second induction coil, and the tail end of the first induction coil and the second induction coil form a cross in the edge area of the coil pair, so that magnetic fields generated by the first induction coil and the second induction coil have fixed vector difference under normal state;
the first coil group comprises a1 st to an N th coil pairs, a first induction coil of an i-th coil pair is arranged on the inner side of a first induction coil of the i-1 th coil pair, a second induction coil of the i-th coil pair is arranged on the inner side of a second induction coil of the i-1 th coil pair, and i=2 and 3 … … N;
the device further comprises a second coil group and a second voltage detection circuit, wherein the second coil group at least comprises a coil pair, the output end of the coil pair is connected with the input end of the second voltage detection circuit, and the first coil group is overlapped with the second coil group in position and is vertical to the direction of the output end;
the second coil group comprises a1 st to an M th coil pairs, a first induction coil of a j-1 th coil pair is arranged on the inner side of a first induction coil of the j-1 th coil pair, a second induction coil of the j-1 th coil pair is arranged on the inner side of a second induction coil of the j-1 th coil pair, and j=2 and 3 … … M;
the first voltage detection circuit comprises a first multi-path electronic switch, a first differential amplifier and a first bipolar voltage collector, wherein the output end of the first coil group is connected with the input end of the first multi-path electronic switch, the output end of the first multi-path electronic switch is connected with the input end of the first differential amplifier, and the output end of the first differential amplifier is connected with the input end of the first bipolar voltage collector;
the second voltage detection circuit comprises a second multi-path electronic switch, a second differential amplifier and a second bipolar voltage collector, wherein the output end of the second coil group is connected with the input end of the second multi-path electronic switch, the output end of the second multi-path electronic switch is connected with the input end of the second differential amplifier, and the output end of the second differential amplifier is connected with the input end of the second bipolar voltage collector;
the shapes and the sizes of the first induction coil and the second induction coil are the same, so that the fixed vector difference of magnetic fluxes generated by the first induction coil and the second induction coil in a normal state is 0.
2. The inductive power transfer metallic foreign object detection system of claim 1 wherein said first coil assembly matches a shape of a charging induction zone of said inductive power transfer system.
3. The method for detecting the metal foreign matters in the inductive power transfer, which is applied to the system for detecting the metal foreign matters in the inductive power transfer according to any one of claims 1 to 2, is characterized in that a first voltage detection circuit is adopted to detect whether the output voltage of the first coil set exceeds a preset value so as to judge whether the metal foreign matters and/or the positions of the metal foreign matters are contained in the first coil set.
4. The method for detecting metallic foreign matter by inductive power transfer according to claim 3, further comprising a second coil group and a second voltage detection circuit, the method further comprising detecting an output voltage of the second voltage detection circuit to determine a two-dimensional position of the metallic foreign matter.
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| CN110095049B (en) * | 2019-06-13 | 2021-09-03 | 美芯晟科技（北京）有限公司 | Charging alignment detection circuit, electronic device and charging alignment detection method |
| CN113031085B (en) * | 2020-08-28 | 2023-06-23 | 深圳大学 | Construction method of metal foreign matter detection coil and metal foreign matter detection system |
| CN115347689A (en) * | 2022-08-30 | 2022-11-15 | 中国第一汽车股份有限公司 | Foreign matter detection device and method and wireless charging system |
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