Wireless energy transmission system and control method thereof

Abstract

The invention relates to a wireless energy transmission system and a control method thereof. The system comprises a DC power supply, an H-bridge inverter, a first compensation capacitor, a second compensation capacitor, a power transmission coil, a rectifier bridge, a DC / DC converter and an energy storage unit, wherein the DC power supply is accessed to the DC side of the H-bridge inverter; the AC side of the H-bridge inverter is connected with the primary coil of the power transmission coil through the first compensation capacitor; the secondary coil of the power transmission coil is connected with the AC side of the rectifier bridge through the second compensation capacitor; the DC side of the rectifier bridge is connected with the input end of the DC / DC converter; and the output end of the DC / DC converter is connected with an energy storage unit and a load. According to the technical scheme provided by the invention, the insulation level of the wireless energy transmission system is improved, the voltammetry level of the wireless energy transmission system is reduced, the system and the method are suitable for a high-voltage application situation, and maximization of the efficiency of the wireless energy transmission system is ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless energy transmission, in particular to a wireless energy transmission system and a control method thereof. Background technique [0002] In the flexible AC transmission system, the voltage level is usually very high, which puts forward high requirements on the insulation level of the driving circuit of the power electronic switching device to ensure safety. Typically, isolation transformers can be used to provide isolated power supplies for these drive circuits. However, isolation transformers are bulky and add cost and installation difficulty. Wireless energy transmission technology can transmit energy between two circuits without direct contact, and the use of wireless energy transmission system can obtain a higher insulation level through sufficient air isolation. Therefore, wireless energy transmission technology is very suitable for providing energy to the drive circuit of power ele...

AI Technical Summary

Problems solved by technology

[0003] In the current wireless energy transmission system, due to the large distance between the coils, the coils interact with each other in the form of weak coupling through the magnetic field, so the leakage inductance of the coils is large, which will generate a lot of reactive power during the power transmission process and reduce the system. Volt-ampere level

In addition, the impedance characteristics of the wireless energy transmission system itself often cannot match the load impedance to the maximum efficiency point to work, which affects the energy output capability from the power supply side to the load side

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