Magnetic field balance distribution type wireless power transmission system based on magnetic resonant coupling

Abstract

The invention discloses a magnetic field balance distribution type wireless power transmission system based on magnetic resonant coupling. An emitting end of the system adopts an array-type resonant coil structure and a feeding mode for simultaneously driving all resonant coils by a single excitation coil, and magnetic resonance between resonant coils of a receiving end and a resonant coil array of the emitting end as well as magnetic fields uniformly distributed at the receiving end are realized. While the transmission efficiency higher than 65% is realized, the axial and transverse receiving ranges of the receiving end are expanded and the stability of wireless power transmission is improved. The emitting end and the receiving end adopt planar structures and can be processed through printed circuit boards, a rectifying and voltage-stabilizing circuit is integrated in a blank area of the circuit board of the receiving end, 5-12 V direct-current voltage can be output, and the size of the receiving end can be reduced to 50*50*1 mm<3>. The wireless power transmission system is suitable for various coil structures such as a rectangular coil structure and a square coil structure, and can be applied to one-to-one and one-to-many wireless power transmission of portable computers, tablet computers, LED illumination equipment, sound boxes, mobile communication terminal and small-sized consumer electronics.

Description

technical field [0001] The invention relates to a magnetic field balanced distributed wireless power transmission system based on magnetic resonance coupling, which belongs to the technical field of wireless power transmission. Background technique [0002] With the continuous development of electronic information technology and automation control technology, various home appliances, consumer electronics, mobile communication equipment, etc. have been widely popularized. However, traditional household appliances rely Electronic devices with built-in batteries also need a wired connection between the charging cable and the power outlet for charging, so we can see wires that provide power supply for these electronic devices everywhere. These wires not only occupy our activity space, limit the convenience of equipment use, but also create hidden dangers for safe use of electricity. Therefore, with the growing demand for portable devices and green energy systems that can be use...

AI Technical Summary

Problems solved by technology

Both the transmitting end and the receiving end of the currently disclosed wireless power transmission system based on magnetic resonance coupling adopt a single resonant coil structure, and the power transmission is realized through the same-frequency magnetic resonance coupling between the resonant coils at the receiving and receiving ends; The wireless power transmission system designed with a single resonant coil will lead to an unbalanced magnetic field distribution at the receiving end, making the transmission efficiency drop significantly when the receiving module moves in a small range along the axial direction and when moving laterally at the same axial distance; The placement of the receiving module requires high requirements. The receiving module must face the center of the transmitting module and be at a specific transmission distance to ensure the effective transmission of electric energy, which does not meet the humanized requirements for the use of electronic products on the market.

Images