Wireless energy transmission system based on parallel inverter and power adjusting method thereof

Abstract

The invention discloses a wireless energy transmission system based on a parallel inverter and a power adjusting method of the system. The inverter in the wireless energy transmission system is the parallel inverter formed by connecting the output end of a first full bridge inverter and a second full bridge inverter in parallel; a first inductor (L1) and a second inductor (L2) with the equal inductance values are in series connection with the output end of the first full bridge inverter and the output end of the second full bridge inverter respectively; the input end of the first full bridge inverter and the input end of the second full bridge inverter are connected with a first direct-current power source (E1) and a second direct-current power source (E2) respectively; the first direct-current power source (E1) and the second direct-current power source (E2) are isolated from each other, and the output voltage amplitude of the first direct-current power source (E1) is equal to that of the second direct-current power source (E2); according to the specific connecting mode of the inverter, a current sensor (IS) and a controller, the control end of the first full bridge inverter, the control end of the second full bridge inverter and the output end of the current sensor (IS) are connected with the controller (KS). The system is large in transmitted electric energy power, low in complexity, high in reliability and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a wireless power transmission system and a power adjustment method thereof. Background technique [0002] When the wireless power transmission technology is applied to the power supply of rail transit trains, electric vehicles and other mobile devices, it overcomes the defects of the traditional wired power transmission technology, such as easy carbon deposition, contact sparks, troublesome plugging operations, etc., and effectively improves the quality and safety of power supply. Sex and reliability, has a high use value. [0003] The main composition and working process of the existing wireless power transmission system are as follows: the alternating current of the industrial frequency is converted into direct current through the rectifier, and is converted into the required voltage by the buck-boost direct-direct converter under the control of the controll...

AI Technical Summary

Problems solved by technology

The existing problems are: 1. Adjust the fundamental effective value of the inverter output voltage through the buck-boost direct-to-direct converter to realize power regulation; while the buck-boost direct-to-direct converter has a complex structure, which increases the system The complexity reduces the reliability and efficiency of the system

2. Limited by the capacity of switching devices, the power of a single high-frequency inverter is limited, which makes it difficult for the output power of the system to meet the requirements of high-power power transmission (such as wireless power transmission for transportation equipment)

Moreover, the high-frequency inverter is usually a two-level single-phase full-bridge inverter, and its output is an alternating voltage with alternating positive and negative levels (rather than a sine wave), which has high harmonic content. Although the subsequent resonant circuit It can eliminate most of the high-order harmonics, but it cannot completely eliminate the low-order harmonics with a lot of content in the system, which may easily cause distortion of the coil current at the sending end and affect the transmission performance of the system

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