US 12,556,044 B2Granted

Positioning system and method based on low frequency magnetic field, and device

AssigneeHuawei Technologies Co., Ltd.

InventorsHongcheng You, Xiaosheng Zeng, Yunhe Mao, Zhixian Wu, Shuangquan Chen, Yanding Liu

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Abstract

Example positioning system based on a low frequency magnetic field and apparatus are described. One example positioning system includes a low frequency magnetic field transmit apparatus and a low frequency magnetic field receive apparatus. The transmit apparatus includes a transmit coil, a conflict detect coil, and a magnetic field generation detection control module. The receive apparatus includes a receive coil and a magnetic field detection control module. When the conflict detect coil does not sense a low frequency magnetic field signal, the magnetic field generation detection control module controls the transmit coil to transmit a first low frequency magnetic field signal. When the received low frequency magnetic field signal is the first low frequency magnetic field signal, the magnetic field detection control module determines relative positions of the transmit coil and the receive coil based on signal strength of the first low frequency magnetic field signal.

Claims15

Dependent claims

A positioning system based on a magnetic field, wherein the positioning system comprises a magnetic field transmit apparatus and a magnetic field receive apparatus, wherein the magnetic field transmit apparatus comprises a magnetic field transmit coil, a sensing coil, and a magnetic field generation detection control circuit, wherein the magnetic field receive apparatus comprises a magnetic field receive coil, and a magnetic field detection control circuit, and wherein:

the sensing coil is configured to sense a magnetic field signal;
the magnetic field generation detection control circuit is configured to:
in response to a determination that a positioning function based on the magnetic field is enabled, generate an initial value of a countdown and start the countdown;
and
in response to a determination that the sensing coil does not sense the magnetic field signal and that the countdown ends, control the magnetic field transmit coil to transmit a first magnetic field signal;
the magnetic field receive coil is configured to receive a magnetic field signal;
and
the magnetic field detection control circuit is configured to:
in response to determining that the magnetic field signal received by the magnetic field receive coil is the first magnetic field signal, determine relative positions of the magnetic field transmit coil and the magnetic field receive coil based on signal strength of the first magnetic field signal.

6 more elements

A positioning method based on a magnetic field, the positioning method is applicable to a positioning system based on the magnetic field, the positioning system comprises a magnetic field transmit apparatus and a magnetic field receive apparatus, and the positioning method comprises:

sensing, by the magnetic field transmit apparatus, a magnetic field signal by using a sensing coil;
enabling, by the magnetic field transmit apparatus, a positioning function based on a magnetic field;
generating, by the magnetic field transmit apparatus, an initial value of a countdown;
starting, by the magnetic field transmit apparatus, the countdown;
in response to a determination that the magnetic field signal is not sensed by using the sensing coil and that the countdown ends, controlling, by the magnetic field transmit apparatus, a magnetic field transmit coil to transmit a first magnetic field signal;
receiving, by the magnetic field receive apparatus, a magnetic field signal by using a magnetic field receive coil;
and
in response to determining that the magnetic field signal received by using the magnetic field receive coil is the first magnetic field signal, determining, by the magnetic field receive apparatus, relative positions of the magnetic field transmit coil and the magnetic field receive coil based on signal strength of the first magnetic field signal.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/154,217Filed 13 Jan 2023 · continuation
Priority: CN 202010687243.216 Jul 2020
Published: US 2023/0179030 A18 Jun 2023
Granted: 17 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

H02J 50/90
Circuit arrangements or systems for wireless supply or distribution of electric power: involving detection or optimisation of position, e.g. alignment
B60L 53/12
Characterised by the energy transfer between the charging station and the vehicle: inductive energy transfer
B60L 53/122
Inductive energy transfer: circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
B60L 53/126
Inductive energy transfer: methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power…