Wireless power transmission system with double coils wound in parallel, and output power distribution method of system

Abstract

The invention provides a wireless power transmission system with double coils wound in parallel, and an output power distribution method of the system. The system comprises a transmitting end and a receiving end, wherein the transmitting end is formed in a manner that a direct-current power supply is connected with an inverter I and an inverter II in parallel; the inverter I is connected with a transmitting coil I through a compensation capacitor I and a power distribution capacitor I, and the inverter II is connected with a transmitting coil II through a compensation capacitor II and a power distribution capacitor II; the transmitting coil I and the transmitting coil II are identical and wound on the same magnetic core in parallel; the receiving end is formed in a manner that a receiving coil is sequentially connected with a compensation capacitor of the receiving end, a rectifier and a load in series. The power distribution method comprises the following steps: calculating and arranging the power distribution capacitors; regulating and controlling total output power through a controller, and distributing the output power by the two inverters according to a ratio. The system is low in cost, high in stability and high in transmission power. Besides, the two inverters are electrically isolated, so that the redundancy, flexibility and reliability of the system are improved. The system only needs one direct-current power supply, the power distribution method is simple and convenient, and the control mode is simple.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a wireless power transmission system with double coils wound in parallel and an output power distribution method thereof. Background technique [0002] The application of wireless power transmission technology to the power supply system of rail transit can avoid the potential safety hazards caused by the contact and sliding power supply of exposed conductors such as the existing catenary or the third rail, and there are no disadvantages such as carbon deposition and friction loss, and it has low maintenance costs. It has the advantages of safety, reliability and high practicability. [0003] The main composition and working process of the existing wireless power transmission system are: the power frequency alternating current is rectified into direct current, and the direct current is inverted into high frequency alternating current after passing through the i...

AI Technical Summary

Problems solved by technology

[0004] The existing problem is that the traditional inverter adopts a single single-phase full-bridge inverter. Due to the limitation of the capacity of the switching device, the output current cannot meet the requirements of high-power electric energy transmission (such as wireless energy transmission for rail transit power supply) , so that the promotion of wireless power transfer technology using a single inverter is greatly limited

The disadvantage of the former is that in the cascaded multi-level inverter circuit with independent DC power supplies, the number of independent DC sources required is large, and there are many power devices. If each DC source needs to be controlled, it will make the entire system The control is complicated; the disadvantage of the latter is that when multiple inverters are connected in parallel, the phase and amplitude of the inverter output voltage are inconsistent, resulting in the generation of circulating current, which will affect the stability of the system and complicate the control strategy of the system Wait

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