Design method of a wireless charging coil with arbitrarily placed charging equipment
A technology of wireless charging and charging equipment, which is applied in the direction of coils, circuit devices, battery circuit devices, etc., can solve the problems of the system not working normally, the transmission efficiency of the system cannot be optimized, the relative position of the sending coil and the receiving coil is uncertain, etc. Achieve the effect that the coupling coefficient remains stable, the design method is simple, and it is beneficial to the overall design
Active Publication Date: 2016-04-06
ZHEJIANG MOORGEN INTELLIGENT TECH CO LTD
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Problems solved by technology
[0005] In order to solve the problem that in the electromagnetic induction coupling wireless charging equipment, due to the uncertain relative position between the transmitting coil and the receiving coil, the transmission efficiency of the system cannot be optimized or even the system cannot work normally, the present invention designs a transmitter that can generate a uniform magnetic field Coil
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Embodiment 1
[0014] Embodiment 1: as figure 1 As shown, a sending coil for mobile phone charging platform is composed of 10 parallel small coils, and the radius of each coil is 0.01m, 0.02m, 0.03m, 0.04m, 0.05m, 0.06m from the inside to the outside. , 0.07m, 0.08m, 0.09m, 0.1m, the line width of each coil is 2mm. In order to generate a uniform magnetic field at a distance of 5mm from the coil, the capacitance on each coil (C a ,C b ) from inside to outside are (1nF, 18nF), (2.2nF, 15nF), (3.3nF, 27nF), (4.7nF, 33nF), (5.6nF, 100nF), (10nF, 22nF), (10nF, 82nF), (18nF, 33nF), (15nF, 470nF), (56nF, 0nF), here only one capacitor is needed on the outermost coil, just short-circuit the capacitor with a capacitance value of 0. When a voltage with a frequency of 100kHz and an amplitude of 10V is applied to the coil, the amplitude of the magnetic field strength generated is as attached figure 2 shown. From attached figure 2 It can be seen that within the coil radius of 0.0968m (accounting f...
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Abstract
The invention discloses a method for designing a wireless charging coil allowing a charging device to be placed freely. The wireless charging coil allowing the charging device to be placed freely is composed of N round single-circle coils which are connected in parallel, two capacitors are connected to each coil in series, and the current ratio between the round single-circle coils is the capacitance ratio between the capacitors connected to the round single-circle coils in series; even magnetic fields can be generated on the surface of a sending coil by reasonably setting the capacitance ratio. According to the method for designing the wireless charging coil allowing the charging device to be placed freely, due to the fact that the parallel connection form is adopted, even magnetic fields can be generated, and requirements for even magnetic fields at different heights of the sending coil can be met by conveniently adjusting the capacitors connected to the coils in series.
Description
technical field [0001] The invention belongs to the field of wireless charging, and in particular relates to the design of a wireless charging coil, which enables charging equipment to be placed freely within a certain range. Background technique [0002] Wireless charging technology has broad application prospects in consumer electronics, medical electronics, and industrial electronics. Electromagnetic induction coupling is the most widely used technology in short-range wireless charging, which transmits electric energy through electromagnetic induction between two coupling coils, the sending coil and the receiving coil. [0003] The efficiency of electromagnetic induction coupling power transfer is closely related to the coupling coefficient between the two coupling coils. Generally, the larger the coupling coefficient, the higher the power transfer efficiency. The coupling coefficient is determined by the shape, size and relative position of the coil. In many applicati...
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IPC IPC(8): H02J50/10H01F5/00H02J7/00
Inventor 程瑜华
Owner ZHEJIANG MOORGEN INTELLIGENT TECH CO LTD