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Weak magnetic field excitation three-coil detection device

A technology of exciting coils and three coils, which is applied in the direction of circuit devices, transportation and packaging, charging stations, etc., can solve the problems of increasing the withstand voltage requirements and anti-interference requirements of signal detection circuits, high-voltage breakdown, etc., and achieve single-point position Effect of detection and auxiliary guidance, reduction of port voltage, reduction of current intensity

Active Publication Date: 2021-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] During the power transmission of the wireless charging system, the current of the primary coil of the non-contact transformer is greatly increased, and a large induced voltage will inevitably be induced at both ends of the detection coil, thereby introducing a high-voltage signal into the signal detection circuit and increasing the resistance of the signal detection circuit. High voltage requirements and anti-interference requirements, in severe cases, it may even cause high voltage breakdown problems

Method used

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  • Weak magnetic field excitation three-coil detection device

Examples

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Embodiment 1

[0100] In order to illustrate the weak magnetic field excitation three-coil detection device of this embodiment, a detailed description will be given below in conjunction with the accompanying drawings. The primary side excitation coil 001 is used to generate a positioning magnetic field, and the secondary side response coil 002 on the other side is connected to the response coil resonant network 004, wherein the detection unit 003 is located on the side of the primary side excitation coil, such as figure 1 shown; or on the side of the secondary response coil, such as figure 2 shown. The detection unit 003 is a detection coil, or a detection sub-unit is formed by connecting multiple detection coils, and the induced electromotive force v of the detection unit 003 3 It can be calculated by the following formula:

[0101] v 3 =jM 13 ωI p +j M 23 ωI s (2)

[0102]Among them, ω is the excitation current I in the primary excitation coil 001 p The angular frequency of M 1...

Embodiment 2

[0113] The difference with embodiment 1 only lies in:

[0114] The induced electromotive force v shown in analytical formula (5) 3 When the positions of the primary excitation coil 001 and the secondary response coil 002 change, regardless of whether the detection unit 003 is installed on the primary excitation coil side or on the secondary response coil side, M 13 The trend of change and M 23 M 12 The changing trends are different. In order to make the induced electromotive force v of the detection unit 003 3 Simplified with the position change trend, the weak magnetic field excitation three-coil detection device of this embodiment installs the detection unit 003 on the side of the primary side excitation coil, that is, the relative position of the detection unit 003 and the primary side excitation coil 001 is fixed, so that in any case m 13 stable. By applying an excitation current at or near the resonance frequency to the primary excitation coil 001, L s ≈0, so that ...

Embodiment 3

[0122] The difference with embodiment 2 only lies in:

[0123] In order to reduce the induced electromotive force v 3 Influenced by the bias constant C, in this embodiment, the detection unit 003 is installed at the induction blind spot of the primary excitation coil 001, that is, the position where the magnetic induction intensity is about 0, so that under any circumstances M 13 ≈0, the simplified formula (6) makes the induced electromotive force v of the detection unit 003 3 With the monotonous change of the relative position of the excitation coil 001 of the primary side and the response coil 002 of the secondary side, the excitation current is reduced, the detection signal is amplified, and the interference of the excitation current of the primary side is reduced.

[0124] at this time:

[0125]

[0126] The relative position coordinates (x, y) of the secondary side response coil 002 and the primary side excitation coil 001 are calculated by the coil mutual inductance...

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Abstract

The invention discloses a weak magnetic field excitation three-coil detection device which comprises an alternating current excitation source, a detection signal sampling board and a primary side exciting coil and further comprises a secondary side response coil, a response coil resonance network and a detection unit. The alternating current excitation source is connected with the primary side exciting coil, and the secondary side response coil is connected with the response coil resonance network. The detection unit comprises at least one detection coil and is connected with the detection signal sampling board. The sufficient detection signal intensity can be obtained under the conditions of the weak exciting power and the weak exciting current, exciting power dissipation is reduced, electromagnetic interference is reduced, the limitation requirement of equipment for electromagnetic exposure is met, and the bad effect of non-contact transformer secondary side induction current on a detection signal is reduced. Parking guidance, position detection and mutual inductance parameter detection are achieved, position information is provided for an electric automobile wireless charging system and automatic parking, and the weak magnetic field excitation three-coil detection device has the advantages of being low in system cost, high in reliability and small in electromagnetic radiation.

Description

technical field [0001] The invention relates to a weak magnetic field excitation three-coil detection device, which belongs to the technical field of wireless power supply, automatic driving and automatic parking. Background technique [0002] Wireless power supply technology has been applied to fields such as electric vehicles, automated guided vehicles (AGV, Automated Guided Vehicle), drones, and autonomous driving, especially where automatic charging is required. Compared with contact power supply, wireless power supply has the advantages of safety, flexibility, no spark, less maintenance, mobility and easy automatic charging. [0003] Since the primary and secondary sides of the wireless power supply system can be separated, it is inevitable that there will be various situations such as air gap changes, horizontal and vertical dislocations, etc., which will cause the coupling coefficient of the non-contact transformer and the self-inductance of the primary and secondary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L53/12B60L53/126B60L53/38B60L53/34H02J50/90H02J50/12
CPCB60L53/12B60L53/126B60L53/34B60L53/38H02J50/12H02J50/90Y02T10/70Y02T10/7072Y02T90/12Y02T90/14
Inventor 张斌陈乾宏徐立刚温振霖任小永张之梁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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