Metal foreign object detection device, method and transmission system for wireless power transmission
A technology of wireless power transmission and metal foreign objects, which is applied in the direction of circuit devices, battery circuit devices, electrical components, etc., can solve problems affecting the efficiency of wireless power transfer of the system, so as to ensure the efficiency of wireless power transmission, avoid overheating, and improve the system safety effect
Inactive Publication Date: 2019-06-28
HUNAN UNIV +1
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Problems solved by technology
[0006] The invention provides a metal foreign object detection device, method and transmission system for wireless power transmission to solve the technical problem that the existing wireless power transmission system has metal foreign object detection that affects the wireless energy transmission efficiency of the system
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[0051] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0052] refer to figure 1 and figure 2 A preferred embodiment of the present invention provides a metal foreign object detection device for wireless power transmission. In this embodiment, the wireless power transmission includes a transmitting coil 1 for converting the electric energy at the input end into radio transmission and a transmission coil 1 for receiving and transmitting The radio transmitted by the coil 1 is converted into an induced electromotive force and transmitted to the receiving coil 2 at the load end. The metal foreign object detection device includes: a plurality of signal acquisition coils 5, and the plurality of signal acquisition coils 5 are arranged in pairs along the ra...
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The invention discloses a metal foreign body detection device and method for wireless power transmission and a wireless power transmission system. The metal foreign body detection device comprises a plurality of signal acquisition coils arranged at the periphery of a transmitting coil, and is characterized in that the plurality of signal acquisition coils are arranged outside the transmitting coil in a pairwise manner along the radial direction of the transmitting coil, the two pairwise arranged signal acquisition coils are opposite in rotating direction, the plurality of signal acquisition coils are connected to a signal processing unit, and whether a metal foreign body exists or not in wireless power transmission is judged according to electromotive force signals of the two pairwise arranged signal acquisition coils. The metal foreign body detection device avoids a problem that a traditional metal detection coil located between a transmitting coil and a receiving coil affects the wireless power transmission efficiency of the system. In addition, the metal foreign body detection device also avoids a risk that a metal detection coil is caused to be too high in temperature because of a metal eddy current effect to result in potential safety hazards, and powerfully improves the safety of the system under the premise of ensuring the wireless power transmission efficiency.
Description
technical field [0001] The present invention relates to the field of wireless power transmission, in particular, to a metal foreign object detection device and detection method for wireless power transmission. In addition, the present invention also relates to a wireless power transmission system comprising the above metal foreign object detection device. Background technique [0002] Wireless Power Transmission (WPT) technology transmits energy between the transmitting end and the receiving end by means of an electromagnetic field, without wires connecting the two. Currently, wireless power transmission technologies mainly include electromagnetic induction and magnetic resonance. If the transmitting coil at the transmitting end is connected to an alternating current of a certain frequency, a certain current will be generated in the receiving coil at the receiving end through electromagnetic induction, thereby transferring energy from the transmitting end to the receiving e...
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IPC IPC(8): H02J50/60H02J50/12H02J50/90
CPCH02J7/025
Inventor 陈新黄守道
Owner HUNAN UNIV