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Algorithm for directly detecting metal foreign bodies for wireless charger

A technology of wireless chargers and metal foreign objects, applied in current collectors, electric power measurement by applying digital technology, instruments, etc., can solve problems such as safety accidents and high temperatures

Active Publication Date: 2014-06-11
BEIJING INVISPOWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a metal object is placed between the transmitting end and the receiving end of the wireless charger, the AC magnetic field will generate eddy current loss in the metal and generate heat, which will generate high temperature and cause a safety accident

Method used

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  • Algorithm for directly detecting metal foreign bodies for wireless charger
  • Algorithm for directly detecting metal foreign bodies for wireless charger
  • Algorithm for directly detecting metal foreign bodies for wireless charger

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Embodiment Construction

[0016] The present invention will be further described in detail in conjunction with the accompanying drawings and examples.

[0017] The wireless charger is composed of DC input, full-bridge inverter circuit, resonant inductor and resonant capacitor, drive circuit, load communication demodulation circuit, power calculation unit, current sampling, input voltage sampling, and resonant inductor voltage sampling. The receiving end is composed of LCC double resonance circuit, load communication modulation circuit, power calculation unit, voltage sampling and other circuits. The receiving end sends the power received by the receiving end to the transmitting end through the load modulation circuit, and the transmitting end sends the load disturbance into high and low levels through the load communication demodulation circuit to the microprocessor at the transmitting end, and the microprocessor translates the power through the agreed communication protocol Generate the required infor...

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Abstract

The invention relates to an algorithm for directly detecting metal foreign bodies for a wireless charger. When the metal foreign bodies appear between the wireless charger and mobile equipment, eddy-current loss of the metal foreign bodies is caused, heat is generated, and accordingly ignition and other security problems are brought. The algorithm is used for detecting heating of the metal foreign bodies and terminating power transmission in time. The core content of the algorithm is as follows: the difference between power transmitted from the transmitting end of the wireless charger and power received from the receiving end of the mobile equipment is detected so that loss power of the metal foreign bodies can be calculated, if the loss power exceeds a certain set value, power transmission is terminated, and thus the temperature of the metal foreign bodies is prevented from further rising.

Description

technical field [0001] The invention relates to preventing heat generation caused by metal foreign objects on a wireless charger. After correction, the algorithm can accurately calculate the heat generation of metal foreign objects, which plays a key role in the safety of wireless chargers in use. [0002] The scope of application of the present invention is mainly electromagnetic induction type wireless charger (QI standard), magnetic resonance type wireless charger, and is used in occasions where the power of a single power source is calculated accurately. Background technique [0003] Among the existing commonly used wireless charging technologies, the QI standard has gradually become a mainstream wireless charging standard. If a metal object is placed between the transmitting end and the receiving end of the wireless charger, the AC magnetic field will generate eddy current loss in the metal and generate heat, which will generate high temperature and cause a safety acci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R21/133H02J7/00H02J17/00H02J50/60
Inventor 不公告发明人
Owner BEIJING INVISPOWER TECH CO LTD
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