Alignment method for wireless charging coil, device and system
A wireless charging and coil technology, applied in battery/fuel cell control devices, charging stations, electric vehicle charging technology, etc., can solve the problems of slow alignment process and low efficiency, and achieve improved speed and accuracy, fast speed, The effect of high charging efficiency
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Embodiment 2
[0103] Embodiment 2. The difference between this embodiment and Embodiment 1 is that this embodiment only needs to obtain the current of the coil 20 at the power supply end, and its control process is simpler.
[0104] According to the existing theory, the charging circuit model of the charging system can be simplified as Figure 10 shown in the circuit diagram. The coupling tightness M between the coil 20 at the power supply end and the coil 40 at the vehicle end can be expressed as Where L1 and L2 are the self-inductance coefficients of the power supply coil 20 and the charging coil respectively, and k is the coupling coefficient.
[0105] Power supply coil 20 current i S and vehicle side coil 40 current i L The expression can be expressed as
[0106] where V L is the battery voltage, V S is the supply voltage,
[0107] Therefore it can be seen that when the battery charging property V L and I L When it remains unchanged, the larger the value of M is, the smaller...
Embodiment 3
[0128] Embodiment three, refer to Figure 7 Specifically, the step "obtaining electrical parameters related to the charging of the coil 20 at the power supply end and / or the coil 40 at the vehicle end" 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 coil 20 at the power supply end.
[0130] Specifically, the step "according to the electrical parameters, adjust the position of the power supply end coil 20 in the horizontal direction according to the preset unit stroke" specifically includes:
[0131] S210c. Substituting 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 and obtain the average displacement that the power supply...
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