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Wireless charging coil alignment method, device and system
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A wireless charging and coil technology, applied in battery/fuel cell control devices, charging stations, electric vehicle charging technology, etc., can solve problems such as low efficiency and slow alignment process, and achieve improved speed and accuracy, fast speed, The effect of high charging efficiency
Active Publication Date: 2020-04-10
SHENZHEN WOER NEW ENERGY ELECTRICAL TECH CO LTD
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[0003] The existing alignment method is generally that the driver controls the electric vehicle to locate and align the wireless charging transmitting coil according to the positioning marks of the charging station, which requires the driver's manual control to realize the alignment of the wireless charging transmitting coil and the wireless charging receiving coil. One alignment process is slow and at the same time inefficient
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Embodiment 2
[0103] In the second embodiment, the difference between this embodiment and the first embodiment is that this embodiment only needs to obtain the current of the power supply end coil 20, and the control process is simpler.
[0104] According to the existing theory, the charging circuit model of the charging system can be simplified to Picture 10 The circuit diagram shown. The coupling tightness M between the power supply coil 20 and the vehicle coil 40 can be expressed as Among them, L1 and L2 are the self-inductance coefficients of the power supply end coil 20 and the charging end coil, and k is the coupling coefficient.
[0105] Power supply coil 20 current i S And vehicle end coil 40 current i L The expression can be expressed as
[0107] Therefore, when the battery charging property V L And I L When unchanged, the larger the value of M, the smaller the current flowing through the coil 20 at the power su...
Embodiment 3
[0128] Example three, reference Figure 7 Specifically, the step of "obtaining electrical parameters related to the charging of the power supply coil 20 and / or the vehicle coil 40" includes:
[0129] Sampling the charging current and charging voltage of the vehicle battery, calculating the charging efficiency or coupling coefficient of the wireless charging coil; and obtaining the charging current of the power supply coil 20.
[0130] Specifically, the step of “adjusting the position of the power supply coil 20 in the horizontal direction according to the preset unit stroke according to the electrical parameters” specifically includes:
[0131] S210c. Substitute at least any two of the charging efficiency, the coupling coefficient, and the charging current into a corresponding preset efficiency field, coupling coefficient field, or current field, respectively;
[0132] S2210c. Calculate the average displacement that the power supply end coil 20 needs to move, and control the power supp...
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Abstract
The invention discloses an alignment method for a wireless charging coil, a device and a system. The alignment method for the wireless charging coil comprises the following steps: acquiring charging-related electrical parameters of a power supply end coil and / or a vehicle end coil; adjusting the position of the power supply end coil in a horizontal direction according to the electrical parameters; judging whether an electrical parameter value reaches a preset electrical threshold and / or adjustment times reach a preset maximum value or not; and if so, finishing the alignment of the charging coil, and otherwise, circulating the steps. According to the technical scheme, the alignment speed of the wireless charging coil is improved, and the charging efficiency is improved.
Description
Technical field [0001] The present invention relates to the technical field of wireless charging, in particular to a method, device and system for aligning a wireless charging coil. Background technique [0002] When an existing electric vehicle adopting a wireless charging method enters a wireless charging station for charging, it is necessary to align the wireless charging receiving coil at the bottom of the vehicle with the wireless charging transmitting coil located on the ground to ensure the maximum charging efficiency. [0003] The existing alignment method is generally that the driver controls the electric vehicle to locate and align the wireless charging transmitting coil according to the positioning mark of the charging station. This requires manual control by the driver to achieve the alignment of the wireless charging transmitting coil and the wireless charging receiving coil. One alignment process is slow and inefficient. Summary of the invention [0004] The main purp...
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