Inductive coupling type electrical energy wireless transmission apparatus and transmission method

Abstract

The invention discloses an inductive coupling type electrical energy wireless transmission apparatus, and provides an inductive coupling type electrical energy wireless transmission apparatus and transmission method, being characterized in the time-sharing processing of the energy injection process and the resonance process. The inductive coupling type electrical energy wireless transmission apparatus includes a power supply, a control circuit, a resonant slot and a secondary energy pickup module, wherein the resonant slot is formed by a switch matrix, a resonant capacitor, a voltage sensor, a current sensor and a loose coupling transformer; and during the working process of the inductive coupling type electrical energy wireless transmission apparatus, one energy transmission period is divided into three modes: an energy injection mode, an adaptive resonant mode and a turn-off mode. The inductive coupling type electrical energy wireless transmission apparatus and transmission method solve the problem that a current inductive coupling wireless electrical energy transmission general method requires that the working frequency of a power converter must be consistent with the working frequency. The wireless energy transmission apparatus can be adaptive to resonance under various complicated working conditions and realize wireless energy transmission with large power and high efficiency.

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...

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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 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 working frequency must be consistent; the literature "Research on Energy Injection Control Method of Inductive Power Transfer System" (Journal of University of Electronic Science and Technology of China, Vol.40No.1, January 2011, pp:69-72) proposes a power converter The working cooperation process with 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 the energy control strategy, but In order to ensure the soft switching condition 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

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