Resonant reactive power shielding method and system for planar wireless power transmission system
A wireless power transmission, planar technology, applied in the direction of circuit devices, electrical components, etc., can solve the problems of increased space, safety hazards, and large redundancy of shielding methods, and achieve reduced magnetic field leakage, reduced power transmission efficiency, and simple structure Effect
Active Publication Date: 2021-09-24
深圳市华禹无线供电技术有限公司
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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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[0036] The principles and features of the present invention will be described below, and the examples are intended to be illustrative of the invention and are not intended to limit the scope of the invention.
[0037] figure 1 A method of method proposed for the present invention, such as figure 1 As shown, a resonance reactive mask method of a flat wireless power transmission system includes the following steps:
[0038] Step 1, a shielding coil of the closed loop in the coil of the wireless power transmission system is provided in series with a matching capacitor for adjusting the shield coil capacitance in series.
[0039] Step 2, using the drain magnetic field generated by the coil of the wireless power transmission system generates an induced voltage in the shield coil, thereby generating a current in the shield coil;
[0040] Step 3, by adjusting the size of the shield coil and the capacitance of the matching capacitor, the current flowing through the shield coil is elimina...
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The invention relates to a resonance reactive shielding method and system for a planar wireless power transmission system. The method includes: setting a shielding coil around the coil of the wireless power transmission system, and a matching capacitor for adjusting the capacitance of the shielding coil is arranged in the shielding coil; The leakage magnetic field generated by the coil itself of the wireless power transmission system is used to generate an induced voltage in the shielding coil, thereby generating a current in the shielding coil; adjusting the size of the shielding coil and the capacitance of the matching capacitor, so that the current flowing through the shielding coil is generated in line with the The elimination magnetic field in the opposite direction of the leakage magnetic field, the elimination magnetic field and the leakage magnetic field cancel each other, thereby reducing the leakage magnetic field. The resonant reactive shielding system of the planar wireless power transmission system proposed by the present invention has a simple structure, and the additional source shielding coil and load shielding coil are small in size and are passive components, and the reduction in power transmission efficiency is negligible, which can be applied in other mobile applications.
Description
Technical field [0001] The present invention relates to the field of wireless power transmission, and more particularly to a resonance reactive mask method and system of a flat wireless power transmission system. Background technique [0002] Wireless power transmission (WPT) is a long history of transmitting power from power to load without using electrical conductor, transmission power without conductive cables, starting from Nikolatesla (Nicholasra), but the actual WPT application Some technological advances have occurred in recent years, although the mobile equipment of WPT technology is increasingly popular, but the electromagnetic field (EMF) generated by WPT systems has the following shortcomings: [0003] 1. Potentially hazardous to users: EMF produced by transmitting and receiving coils produces current and heat in vivo, which can cause nerve, muscles and tissues to be stimulated, and changes in the central nervous system. [0004] 2. Existing shielding method redundancy...
Claims
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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