Device and method for detecting and positioning metal foreign matters of wireless charging system based on rack-shaped differential detection coil assembly
A technology for detecting coils and metal foreign objects, which is applied in circuit devices, charging stations, electric vehicle charging technology, etc., and can solve problems such as missed detection of small-sized metal foreign objects and detection blind spots
Pending Publication Date: 2022-01-28
HARBIN INST OF TECH
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Problems solved by technology
[0005] (1) The single-layer circular coil array will generate a detection blind zone in the area between adjacent sub-coils;
[0006] (2) The structure of the rectangular coil is simple and easy to design and process. The mutual inductance between the metal foreign object and the metal foreign object is distributed evenly along the lateral direction. a large area of missed detection
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[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0039] The following describes the device and method for detecting and locating metal foreign objects in a wireless charging system based on a rack-shaped differential detection coil group according to an embodiment of the present invention with reference to the accompanying drawings. A device for detecting and locating metal foreign objects in a wireless charging system with a differential detection coil group.
[0040] figure 1 It is a schematic structural diagram of a device for detecting and locating metal foreign...
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The invention discloses a device and a method for detecting and positioning metal foreign matters of a wireless charging system based on a rack-shaped differential detection coil group. The device comprises a double-layer detection coil group, a foreign matter signal conditioning circuit , a digital signal processing and comparing circuit and an upper computer; the double-layer detection coil group comprises two single-layer rack-shaped differential detection coil groups which are orthogonally overlapped up and down, and the single-layer rack-shaped differential detection coil groups are overlapped at any 1 / 4 position of a transmitting coil; when metal foreign matters exist, mutual inductance is generated ; the foreign matter signal conditioning circuit is used for acquiring a mutual inductance voltage value of each detection coil group and a metal foreign matter; the digital signal processing and comparing circuit is used for converting each mutual inductance voltage value into a digital variable quantity and processing to determine the serial number of a channel where the metal foreign matter is located; and the upper computer is used for determining the matrix data of the channel number so as to draw a two-dimensional plane cloud picture. According to the device, the rack-shaped coil is adopted, so that the mutual inductance value of the detection coil and the foreign matter in a partial area is increased, the detection probability of the small-size foreign matter is increased, and large-area missing detection of the detection coil group on the small-size metal foreign matter is avoided.
Description
technical field [0001] The invention relates to the technical field of metal foreign object detection in electric vehicle wireless power transmission systems, in particular to a device and method for detecting and locating metal foreign objects in a wireless charging system based on a rack-shaped differential detection coil group. Background technique [0002] In order to improve the charging power and efficiency and meet the height requirements of various types of vehicle chassis, the electric vehicle wireless charging system usually adopts the magnetically coupled resonant wireless power transfer (MCR-WPT, Magnetically-coupled Resonant Wireless Power Transfer) method. Due to the strong magnetic field between the coupling mechanisms, the mixed metal foreign matter will produce eddy current effect and magnetic effect after being affected by the magnetic field, thereby changing the parameters such as self-inductance, mutual inductance, and quality factor between the primary co...
Claims
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Login to View More IPC IPC(8): H02J50/12H02J50/60H02J50/80B60L53/12
CPCH02J50/12H02J50/60H02J50/80B60L53/12Y02T10/70Y02T10/7072Y02T90/14Y02T90/16
Inventor 齐超段红宇郭军伟杨福宁王文武
Owner HARBIN INST OF TECH