Resonant reactive shielding method and system of plane wireless power transmission system

A wireless power transmission, plane technology, applied in electrical components, circuit devices, etc., can solve the problems of large redundancy of shielding methods, safety hazards, increased space, etc., to reduce power transmission efficiency, reduce leakage magnetic fields, and reduce leakage magnetic fields. Effect

Active Publication Date: 2019-03-12
深圳市华禹无线供电技术有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] 1. Potential danger to user's safety: EMF generated by transmitting and receiving coils generates electric current and heat in the body, which can lead to irritation of nerves, muscles and tissues, as well as changes in the central nervous system
[0004] 2. Existing shielding methods are redundant: many shielding methods meet the regulations on EMF leakage of WPT systems, including the use of ferromagnetic materials, conductive shielding and active cancellation, however, these shielding methods usually require increased space, weight, cost and work consumption

Method used

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  • Resonant reactive shielding method and system of plane wireless power transmission system
  • Resonant reactive shielding method and system of plane wireless power transmission system
  • Resonant reactive shielding method and system of plane wireless power transmission system

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Embodiment Construction

[0036] The principles and features of the present invention are described below in conjunction with examples, which are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0037] figure 1 A schematic flow diagram of the method proposed by the present invention, such as figure 1 As shown, a resonance reactive power shielding method for a planar wireless power transmission system includes the following steps:

[0038] Step 1, a closed-loop shielding coil is arranged around the coil of the wireless power transmission system, and a matching capacitor for adjusting the capacitance of the shielding coil is connected in series in the shielding coil;

[0039] Step 2, using the leakage magnetic field generated by the coil itself of the wireless power transmission system to generate an induced voltage in the shielding coil, thereby generating a current in the shielding coil;

[0040] Step 3, by adjusting the size of the shield...

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Abstract

The invention relates to a resonant reactive shielding method and system of a plane wireless power transmission system. The method comprises the following steps: arranging a shielding coil at a coil periphery of a wireless power transmission system, wherein a matching capacitor for adjusting a capacitance of the shielding coil is arranged in the shielding coil; producing induced voltage in the shielding coil by utilizing a drain magnetic field produced by the coil of the wireless power transmission system, thereby producing current in the shielding coil; adjusting the size of the shielding coil and the capacitance of the matching capacitor, enabling the current flowing in the shielding coil to produce a cancelling magnetic field opposite to the drain magnetic field, wherein the canceling magnetic field and the drain magnetic field are mutually counteracted, thereby reducing the drain magnetic field. The resonant reactive shielding system of the plane wireless power transmission provided by the invention is simple in structure, the added source shielding coil and load shielding coil are small in size and are reactive elements, the reduction of the power transmission efficiency can be ignored, and the resonant reactive shielding system can be applied to other mobile applications.

Description

technical field [0001] The invention relates to the field of wireless power transmission, in particular to a resonance reactive power shielding method and system for a planar wireless power transmission system. Background technique [0002] Wireless power transfer (WPT) is the process of transferring power from a power source to a load without the use of electrical conductors. The process of transferring power without conductive cables has a long history, starting with Nikola Tesla (Nikola Tesla), but the majority of practical WPT applications Some technological advancements have occurred in recent years. Although mobile devices with WPT technology are becoming more and more popular, there are the following shortcomings in the solution of electromagnetic fields (EMF) generated by WPT systems: [0003] 1. Potential danger to user's safety: The EMF generated by the transmitting and receiving coils generates electric current and heat in the body, which can lead to irritation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/70
CPCH02J50/70
Inventor 周洪张炜龙李佳李刚邓其军胡文山周东国
Owner 深圳市华禹无线供电技术有限公司
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