Electric automobile high-efficiency voltage-stabilizing wireless charging system and design method thereof

Abstract

The invention provides an electric automobile high-efficiency voltage-stabilizing wireless charging system and a design method thereof. The method comprises the following steps: constructing a mutual inductance circuit model of the system and a transmission efficiency expression of the mutual inductance circuit model; solving an expression of an optimal load and an output power expression of the system under the optimal load based on the transmission efficiency expression; on the premise of the optimal load, substituting the maximum duty ratio of a preset BUCK circuit and the maximum power of the system into the output power expression, obtaining the ratio N of primary side compensation inductance to primary side coil inductance, and configuring parameters of an LCC-S compensation circuit according to the N; and adjusting the equivalent load value of the system through the impedance matching circuit to make the equivalent load value follow the optimal load value all the time so as achieve maximum efficiency tracking control. According to the invention, high-efficiency stable-voltage charging can be carried out on the high-power electric vehicle storage battery, so that the system performance is improved.

Description

technical field [0001] The invention relates to the technical field of wireless energy transmission, in particular to a high-efficiency voltage-stabilizing wireless charging system for electric vehicles and a design method thereof. Background technique [0002] At present, most electric vehicles use wireless charging technology. During the wireless charging process of electric vehicles, the equivalent resistance of the battery load of electric vehicles is constantly changing, which leads to low transmission efficiency of the entire wireless charging system. [0003] In order to improve the transmission efficiency of the wireless charging system, Pang Haiping, Qiu Yi, and Chen Haoran published a paper entitled "Maximum Efficiency Tracking of WPT System Based on Optimal Load Matching". The optimal impedance matching method of the observation algorithm realizes the maximum efficiency tracking of the WPT system. However, the scheme proposed in this paper has the following prob...

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Problems solved by technology

[0004] (1) Although the maximum efficiency tracking of the system has been realized, the maximum efficiency value that can be achieved is still low because the system parameters remain unchanged;

[0005] (2) The perturbation and observation algorithm is prone to errors, and at the same time reduces the efficiency of tracking speed;

[0006] (3) Only a single output index of system efficiency is considered, but the output voltage of the system is not stabilized and optimized

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