CN-114884225-B - Coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system

Abstract

The invention discloses a coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system which comprises a high-frequency inverter power supply, a soft magnet enhanced adjacent coil magnetic coupling LC resonator array and a plurality of loads, wherein the LC resonator array comprises a source end coupling coil and a public end relay coupling coil, the public end relay coupling coil extends to form a constant-voltage branch coil and a constant-current branch coil, the constant-voltage branch coil comprises a constant-voltage branch load end coupling coil, the constant-current branch coil comprises a constant-current branch relay coupling coil and a constant-current branch load end coupling coil, the upper surface and the lower surface of a joint of the adjacent coils are covered with double-layer soft magnets, and all coils are connected in series with tuning capacitors for tuning the resonators to working frequencies. The invention has simple structure, and each branch is mutually independent through the common terminal relay coupling inductance coil, and constant current and constant voltage output can be realized on each branch which is not affected by each other, thereby meeting the charging characteristics of different electric appliances.

Inventors

• LUO BIN
• CHENG KAIXIN
• YIN JIABIN
• XU YAFEI
• LIU QI
• ZHANG KUN
• ZHOU YUXIN

Assignees

• 南昌大学

Dates

Publication Date

20260512

Application Date

20220526

Claims (3)

1. 1. A coplanar load-independent multi-branch constant-current constant-voltage wireless power transmission system is characterized by being of a multi-path chain coplanar WPT structure and comprising a high-frequency inverter power supply, a soft magnet enhanced adjacent coil magnetic coupling LC resonator array and a plurality of loads; the LC resonator array comprises a source end coupling coil and a public end relay coupling coil, wherein the source end coupling coil is connected with a high-frequency inverter power supply in series, the public end relay coupling coil is extended and provided with a constant-voltage branch coil and a constant-current branch coil, the constant-voltage branch coil comprises a constant-voltage branch load end coupling coil, the constant-current branch coil comprises a constant-current branch relay coupling coil and a constant-current branch load end coupling coil, the upper surface and the lower surface of a joint of adjacent coils are covered with double-layer soft magnets, the constant-voltage branch load end coupling coil is connected with a load in series and can be used as a relay coil when the constant-voltage branch relay coupling coil extends, the constant-current branch load end coupling coil is connected with the load in series, all coils are connected with tuning capacitors in series and used for tuning the resonator to an operating frequency, the constant-voltage branch coils are arranged in two, one constant-voltage branch coil is removed or one constant-current branch coil is removed, the voltage current change of the load output is within a range of 10%, the constant-voltage output characteristics are met, the constant-voltage output characteristics are independent of constant-voltage output by multiple branches, and constant-voltage output constant-current branches are independent from each other, and constant-current output branches are independent.
2. 2. The coplanar load-independent multi-branch constant-current and constant-voltage wireless power transmission system according to claim 1, wherein the coil is shaped as a plane square or a plane round with a low profile.
3. 3. The coplanar load-independent multi-branch constant-current and constant-voltage wireless power transmission system as claimed in claim 1, wherein the high-frequency inverter power supply is a DC-AC or AC-DC-AC power supply, and the DC-AC partial circuit is a half-bridge or full-bridge inverter power supply.

Description

Coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system Technical Field The invention belongs to the technical field of wireless energy transmission systems, and particularly relates to a coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system. Background WPT technology is increasingly used in various fields for supplying power to electric appliances, and the application fields of WPT technology include electric automobiles, implanted medical devices, unmanned aerial vehicles, portable electronic devices and the like. One of the most important application scenarios of WPT is to charge multiple loads, wherein one of the most prominent problems is to provide stable output for a receiver, and the realization of stable constant-current constant-voltage output characteristics becomes a research hotspot. Patent CN111478458a proposes a wireless power transmission system and a constant-current and constant-voltage control method thereof, which utilize a DSP processor and a wireless power transmission device to realize constant-current or constant-voltage output by switching back and forth a switch controller, a current acquisition circuit, a voltage acquisition circuit and a compensation network on each receiving module. The mode can not realize constant current and constant voltage output at the same time, and can not meet the requirements of various electric appliances at the same time. Patent CN110429691a proposes a constant-current-constant-voltage charging wireless Power transmission system based on half-bridge switching, constant-current-constant-voltage charging of a battery can be realized by switching on a switching tube in a high-frequency inversion module without complex and continuous closed-loop regulation control, document A WIRELESS Power TRANSFER SYSTEM WITH Multiple Constant Current and ConstantVoltage Outputs proposes a multi-load wireless Power transmission system with constant-current constant-voltage output, each coil adopts a series compensation topology, in an odd repeater unit, a load is connected in series with two repeater coils, in an even repeater unit, the load is connected in parallel with the two repeater coils, and an odd unit and an even unit realize CC and CV respectively. The coil design is ingenious, but the structure is complex, but the condition of independently carrying out constant voltage or constant current power supply is not considered. The common problems of these researches are that either the compensation circuit is complex, the coil structure is arranged complex, or the multi-load system can only output constant voltage or constant current singly, and one system can not meet the requirements of different loads to output different load irrelevant characteristics. Disclosure of Invention Aiming at the defects and the problems in the prior art, the invention aims to provide a coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system, each branch is mutually independent through a common terminal relay coupling inductance coil, constant-current constant-voltage output can be realized on each branch which is not affected by each other, and the charging characteristics of different electric appliances are met. The application prospect of the coplanar WPT technology is greatly improved. According to the invention, the double-layer soft magnet is placed at the proper position of the upper surface and the lower surface of the joint of the adjacent coplanar coils, so that the magnetic coupling of the adjacent coils is obviously enhanced, the constant current and constant voltage output can be realized simultaneously by the common end coupling inductance coils, any one section of coil is taken away without affecting the charging effect of other sections, and the stable constant current and constant voltage output is realized by the system without affecting the change of load. The advantages can obviously promote the practicability of the coplanar wireless power transmission system and expand the application prospect thereof. The invention is realized by the following technical scheme: the invention provides a coplanar type load-independent multi-branch constant-current constant-voltage wireless power transmission system which is of a multi-path chain type coplanar WPT structure and comprises a high-frequency inverter power supply, a soft magnet enhanced adjacent coil magnetic coupling LC resonator array and a plurality of loads, wherein the LC resonator array comprises a source end coupling coil and a public end relay coupling coil, the source end coupling coil is connected with the high-frequency inverter power supply in series, the public end relay coupling coil is extended and extended to form a constant-voltage branch coil and a constant-current branch coil, the constant-voltage branch coil comprises a constan