Planar wireless charging transmitter based on repeating coil

Abstract

The invention provides a planar wireless charging transmitter based on a repeating coil. The transmitter comprises an inverter circuit, the inverter circuit is used for converting a direct-current power supply into a high-frequency alternating current and then accessing the high-frequency alternating current into a source coil and a source coil compensation network, and is characterized by further comprising the source coil, the source coil compensation network, the repeating coil and a repeating coil compensation network. The source coil compensation network and the relay coil compensation network are respectively used for eliminating reactive power caused by the source coil and self-inductance. According to the scheme based on the planar wireless charging transmitter, the relay coil capable of being put in / cut out is adopted, and when the center position of a receiver is aligned with the center position of the source coil or the offset is small, the relay coil is cut out; on the contrary, when the offset is large, the relay coil is put into use. Experimental results show that the transmission power and efficiency of the full charging area of the transmitter can be ensured, and the problems of charging offset tolerance performance, user experience, economic cost and the like are considered at the same time.

Description

technical field [0001] The present invention relates to a class of planar wireless charging transmitters. Background technique [0002] As a non-contact power supply technology, wireless charging has been widely used in many fields such as portable electronic devices, implantable medical devices, and electric vehicles. Taking small and medium power devices represented by mobile phones as an example, most wireless charging transmitter products on the existing market can transmit power with high efficiency when placed in alignment with the center of the receiver. However, when the horizontal position offset between the two increases, the transmission efficiency decreases rapidly, that is, the offset tolerance is poor. [0003] In order to solve this problem, some enterprises have given tentative solutions. It can be mainly divided into the following three types: The first one is to directly increase the size of the transmitting coil in the transmitter. Although this solution...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: most of the existing small and medium power wireless charging transmitter products have poor offset tolerance performance. Taking into account issues such as experience and economic costs

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