Charging device having small loop transmission coils for wireless charging a target device
地域：
Hong Kong
摘要
A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.
說明書
At operation 37, combining the parameters determined from the first and second ones of the pair of small loop transmission coils 22, the capacitance of capacitors C1 and C2 could be fine-tuned in order to an achieve enhanced magnetic field in a certain distance range of wireless charging. If the primary coil antenna 21 and the small loop transmission coils 22 work normally (the magnetic field is not decreased sharply based on different distances between the primary coil antenna 21 and the secondary coil antenna of the target device), then fine-tuning is well accomplished.
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