An inductively coupled electric energy wireless transmission device and transmission method

Abstract

The invention discloses an inductively coupled electric energy wireless transmission device, and provides an inductively coupled electric energy wireless transmission device and a transmission method in which the energy injection process and the resonance process are time-shared. It includes a power supply, a control circuit, a resonant tank, and a secondary energy pickup module; the resonant tank is composed of a switch matrix, a resonant capacitor, a voltage sensor, a current sensor, and a loosely coupled transformer. During operation, an energy transmission cycle is divided into three modes: energy injection mode, adaptive resonance mode, and shutdown mode; it solves the problem that the working frequency of the power converter and the resonance network must be consistent in the current general method of inductively coupled wireless power transmission , the wireless energy transmission device can adaptively resonate under various complex working conditions, and realize high-power and high-efficiency wireless energy transmission.

Description

Technical field: [0001] The invention relates to the field of non-contact power supply, and is especially suitable for an inductively coupled electric energy wireless transmission device and a transmission method that are not suitable for contact type such as electric vehicles, robots, and underwater electric energy transmission. Background technique: [0002] As we all know, electrical energy transmission is generally obtained from the grid through electrical conductor contact fastening devices or contact plugs, but in some special occasions, electrical energy transmission through electrical conductor contact may cause problems such as poor contact, overheating and burning. In order to solve the transmission of electric energy in special occasions, many methods of wireless transmission of electric energy have been proposed at home and abroad, such as microwave, laser, ultrasonic, electromagnetic induction coupling (referred to as inductive coupling) and other wireless energy...

AI Technical Summary

Problems solved by technology

However, the problem with this method is that the operating frequency of the power converter needs to be consistent with the resonant frequency of the resonant network (that is, in a resonant state) during operation, so it should be detuned and cannot work normally in actual use.

For this reason, patents CN201310065865.1 and CN201110283083.6 proposed a method using phase-controlled capacitors, and patent CN201310066463.3 proposed a method of using controllable inductors to perform resonance compensation tracking respectively to maintain the same resonance frequency between the power converter and the resonant network , so as to improve the detuning problem of the resonant network. Due to the limited number of compensation capacitors or compensation inductances used in this method, the resonant frequency compensation tracking can only be performed in a limited frequency range, so it cannot really solve the resonant frequency of the power converter and the resonant network. The problem that the operating frequency must be consistent; the literature "Research on Energy Injection Control Method for Inductive Power Transfer System" (Journal of University of Electronic Science and Technology of China, Vol.40 No.1, January 2011, pp:69-72) proposed a method to convert the The working cooperation process between the device and the resonant network is divided into two stages of energy injection and free resonance. Although this method can improve the complexity of the mathematical model in the circuit design analysis process and provide a new method for energy control strategies, However, in order to ensure the soft switching conditions when the circuit works, the operating frequency of the power converter and the resonant network must still be consistent

In conclusion, although there are many beneficial measures for system resonance compensation or control strategy changes, since the power converter and the resonant network are not completely decoupled, the constraint that the operating frequency of the power converter must be consistent with the resonant frequency of the resonant network is not sufficient. Therefore, due to the complexity of various factors in the actual wireless transmission of electric energy environment, the actual application effect of the above method is not ideal

Images