Wireless electric energy transmission system for improving self-stability of output voltage by utilizing ferromagnetic resonance principle

Abstract

The invention discloses a wireless electric energy transmission system for improving self-stability of output voltage by utilizing a ferromagnetic resonance principle. The wireless electric energy transmission system is embodied in an electric energy receiving side. The system mainly comprises a parallel ferromagnetic resonance circuit and a series impedance compensation capacitor. The parallel ferromagnetic resonance circuit comprises a magnetic saturation reactor and a linear capacitor connected with the magnetic saturation reactor in parallel. Due to the non-linear characteristic of the magnetic saturation reactor, when the parallel voltage rises to a certain value, the current of the saturation reactor and the current of the parallel capacitor are equal in effective value and oppositein phase, namely, parallel ferromagnetic resonance occurs. According to the invention, he parallel ferromagnetic resonance circuit is inductive, i.e. To cross a resonance state, in a rated output voltage range due to design. The series impedance compensation capacitor is used for compensating the self-inductance reactance of a receiving coil, and the compensated total reactance is inductive. The self-stabilization effect of the output voltage can be achieved, no feedback technology is needed, no switching device is needed, and use of an isolation power supply is avoided.

Description

technical field [0001] The invention proposes a wireless power transmission system that uses the principle of ferromagnetic resonance to improve the self-stability of output voltage, and belongs to the field of electric power engineering. Background technique [0002] Wireless power transmission technology refers to the technology that can transmit electric energy without wire connection, and it shows a good application prospect in charging mobile devices. However, due to the working characteristics of mobile devices, every time wireless power transfer technology is used for charging, there will always be differences in the relative positional relationship between the transmitting coil and the receiving coil, which will affect the induced electromotive force of the receiving coil and the final output voltage. Similarly, when the system deviates from the originally designed impedance matching conditions, resulting in changes in the natural frequency of the system, or fluctuat...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the output voltage needs to be detected and fed back to the transmitting side wirelessly, and then the output voltage of the transmitting power supply can be changed by adjusting the duty cycle of the inverter power supply.

However, due to the use of switching devices, it is inevitable to use an isolated power supply, which is inconvenient and impractical for the receiving side that originally has no power supply

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