A device, equipment and method for detecting metal foreign objects in a wireless charging system
A metal foreign object and wireless charging technology, which is applied in the direction of circuit devices, battery circuit devices, charging stations, etc., can solve the problems of large amount of data calculation and data storage, and achieve a small amount of calculation, simplified detection process, and high control accuracy. Effect
Active Publication Date: 2020-07-24
HUAWEI TECH CO LTD
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Problems solved by technology
[0006] This application provides a device, equipment and method for detecting metal foreign objects in a wireless charging system, so as to solve the problem of large amount of data calculation and data storage in the existing metal foreign object detection scheme in the wireless charging system
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Embodiment Construction
[0067] When there is a metal foreign body in the wireless charging system (especially a non-contact wireless charging system), that is, when there is a metal foreign body on the surface of the transmitting coil of the wireless charger or the surface of the receiving coil of the device to be charged, there is induction in the transmitting coil or the receiving coil In the case of electric current, eddy currents will be generated in the metal foreign body due to electromagnetic induction, which will cause the metal to heat up, even spontaneously ignite or cause other objects near the metal foreign body to burn, bringing safety hazards to the wireless charging system and surrounding objects. .
[0068] In the prior art, a resonant circuit composed of a foreign object detection coil and a resonant capacitor is generally used to detect whether there is a metal foreign object between the transmitting coil of the wireless charger and the receiving coil of the device to be charged. When ...
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A device, device, and method for detecting metal foreign objects in a wireless charging system, the device comprising: a phase-locking control module, configured to use the phase of the first signal output by the phase-locking control module and the third signal collected by the signal acquisition module Adjust the frequency of the first signal, and send the first signal to the excitation module and the judgment module, and adjust the phase difference between the first signal and the third signal The value is less than the first set value; the excitation module is used to generate a second signal according to the first signal, and output the second signal to the resonance module; the resonance module is used to be excited by the second signal, The third signal output to the signal acquisition module through the resonant circuit formed by the target coil and the target capacitor; the judgment module is configured to judge the signal output by the phase-lock control module and the pre-stored fourth signal according to the resonant circuit formed by the target coil and the target capacitor. Check whether there is any metal foreign object in the area where the target coil is located.
Description
Technical field [0001] This application relates to the field of wireless charging technology, and in particular to a device, equipment and method for detecting metal foreign objects in a wireless charging system. Background technique [0002] The wireless charging technology uses electromagnetic fields or electromagnetic waves for energy transmission, which makes the charger get rid of the limitation of the line, realizes the complete separation of the equipment to be charged and the power supply, and is safe (such as no spark and electric shock) and flexibility (such as adapting to a variety of harsh Environment, easy to realize unmanned automatic charging and mobile charging, etc.) show better advantages than traditional chargers. [0003] However, when there is a metal foreign object between the transmitter coil of the wireless charger and the receiving coil of the device to be charged, when there is current in the transmitter coil or the receiving coil, eddy currents will be ge...
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IPC IPC(8): H02J50/12H02J50/60H02J7/02
CPCH02J7/025H02J50/12H02J50/60H02J2310/48B60L53/124Y02T10/70Y02T10/7072Y02T90/14
Inventor 毛云鹤武志贤刘彦丁肖辅荣
Owner HUAWEI TECH CO LTD