Wireless magnetic-resonance charging device based on array coils

Abstract

The invention relates to a wireless charging device, in particular to a wireless magnetic-resonance charging device based on array coils. The wireless magnetic-resonance charging device comprises a power supply, a control circuit, a driving circuit and a transmitting terminal, which are sequentially connected, and a receiving terminal and an electric energy converting circuit, which are sequentially connected, wherein the transmitting terminal comprises a plurality of spiral coils; the receiving terminal is a spiral coil. The wireless magnetic-resonance charging device has the advantages as follows: 1, different from conventional circular coils, the coils adopting efficient array structures can enable an electromagnetic field to be distributed uniformly to a certain extent; 2, the distribution of the electromagnetic field generated by the efficient array coils compared with conventional coils is more regular; 3, under a certain external environmental condition, the distribution of the efficient array coils can be regulated so as to efficiently transmit electric energy; 4, the transmitting array coils and the receiving array coil can have the same or different structures and can be flexibly regulated.

Description

[0001] technical field [0002] The present invention relates to a wireless charging device, in particular to a magnetic resonance wireless charging device based on an array coil. Background technique [0003] Compared with the charging method of conductor connection, wireless charging is safer and more convenient, and the charging process is less susceptible to interference. Due to the natural grid isolation, the reliability and safety of wireless chargers are greatly improved. The power transmission is carried out through the appropriate distance between the transmitting coil and the receiving coil installed on the device, which can eliminate the inconvenience of short circuits caused by cables, connectors and plugs, and is an autonomous charging system. [0004] Current wireless power charging devices are mainly based on two methods: inductive coupling and magnetic resonance. Inductive coupling has been used in various fields, but it has several disadvantages. One is t...

AI Technical Summary

Problems solved by technology

One is that the size of the coil at the receiving end has a greater impact on the received power, and a large current is required to ensure normal charging; the other is that the transmission distance is very short, the transmission efficiency is very low, and it is easily affected by the deviation between the transmitter and receiver coils , the scope of application is greatly limited; the third is that the surrounding radiation is relatively large, which affects the surrounding animals and plants and the normal operation of electronic equipment, etc.

The magnetic resonance method has been widely used in signal transmission, but there are few reports on its application in power transmission. Compared with the inductive coupling method, the magnetic resonance method uses the magnetic resonance coil for selective energy transmission, so that the surrounding human body and other objects receive The radiation is also greatly reduced, which reduces the impact on the surrounding environment; at the same time, the influence of coil offset on energy transmission is weakened, and the transmission distance and transmission efficiency are greatly improved.

Images