Electric automobile wireless charging automatic starting and guiding system without position sensor

Abstract

A wireless charging automatic starting and guiding system for an electric vehicle without a position sensor provides a newly designed magnetic coupler resonance network, utilizes the characteristic that the primary side input power is close to zero under the condition that no secondary side coil exists, and only uses simple modules and functions such as broadcast of wireless communication and the like. Therefore, the primary side main loop can be awakened and the vehicle can be guided to be aligned with the charging position. According to the system, the principle that the primary side input power is close to zero under the condition that no secondary side coil exists, the output current and voltage are gradually increased in the process that a secondary side gradually reaches a target position, but the change rate is gradually reduced to zero is utilized, and whether a vehicle is aligned to a charging position or not can be judged only by sampling secondary side output; complex sensing modes and algorithms used in the prior art do not need to be set at all, and the complexity and cost of the system are remarkably reduced. According to the resonant network provided by the invention, the current of each stage is controllable under the condition of no secondary side coil, and no-load operation can be realized, so that the resonant network has relatively good reliability.

Description

technical field [0001] The invention belongs to the technical field of wireless charging systems for electric vehicles, and in particular relates to an automatic start-up and position guidance system for wireless charging of electric vehicles without a position sensor. Background technique [0002] In the existing wireless charging system suitable for electric vehicles, in order to ensure the accuracy of the relative position of the transmitting coil and the receiving coil during operation, it is necessary to set up a position sensor to assist in positioning. Otherwise, once the deviation of the relative position of the coil exceeds the allowable range, the wireless charging system will A large amount of reactive current will be accumulated inside, which will consume energy at the slightest and cause system damage at the worst, so that the wireless charging system cannot start working before the alignment is achieved. The position sensors used in the prior art include but ar...

AI Technical Summary

Problems solved by technology

However, these existing technologies are still unable to overcome problems such as system complexity and high cost, especially the automatic alignment of the charging position cannot be realized

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