Charging method based on constant current-constant voltage output characteristics of wireless electric energy transmission system
A technology of wireless power transmission and constant voltage output, which is applied to battery circuit devices, current collectors, electric vehicles, etc., and can solve problems such as shortened cycle life and rapid drop in battery capacity
Active Publication Date: 2019-03-15
XIAN UNIV OF TECH
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Problems solved by technology
The long service life of the battery depends to a large extent on the correct charging method. Numerous facts have proved that even the best battery is prone to serious problems such as rapid decline in battery capacity and shortened cycle life under inappropriate charging methods.
With the development and application of charging technology, high safety, high reliability and high efficiency requirements are put forward for battery charging technology, which makes battery charging technology face higher challenges
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[0148] The research method of the present invention is carried out simulation analysis, in the parameter calculation process, known simulation parameters have: DC voltage source output voltage is 100V, high-frequency inverter output square wave AC voltage effective value U 1v =90V, resonant frequency f 0 = 85kHz;
[0149] Set the self-inductance L of the primary coil of the coupler 1 =125μH, the self-inductance L of the secondary side coil 2 =125μH, mutual inductance M=37.5μH (that is, coupling coefficient k=0.3), L 0 = 125 μH. Parallel capacitance C on the primary side 1 =56.09nF, the secondary side series capacitor C 2 =28.05nF, from the formula (18), when the coupling coefficient k=0.3, ω nB =1.144, that is, the high operating frequency point f 0B =1.144, f 0 = 97kHz; do not consider the application of complex working conditions in the charging process of the battery, so only the influence of its internal resistance is considered. In the simulation, the resistance v...
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The invention discloses a charging method based on the constant current-constant voltage output characteristics of a wireless electric energy transmission system. LC / S compensation topology is adoptedto replace a direct current input voltage source and an inverter in the LC / S compensation topology with a sinusoidal voltage source of which the frequency is equal to inverter switching frequency, the parasitic resistance of an inductor and a capacitor is ignored, and a loose coupling transformer is replaced with a mutual inductance model to obtain an equivalent mutual inductance model circuit; afull bridge rectifying circuit is replaced with an equivalent load resistor RE, and a primary side parallel compensation capacitor C1 is split into capacitors C1' and C1'' to form LC, CL and series resonant cavities to obtain a simplification circuit; a mutual conductance gain Gi and a voltage gain Gv are defined to obtain a frequency point when the wireless electric energy transmission system has constant current output characteristics and constant voltage output characteristics; and the system is under the obtained frequency point to carry out constant current-constant voltage sectional charging. By use of the method, through the same compensation topology transformation work frequency point, wireless electric energy transmission constant current or constant voltage output characteristics are realized, and therefore, the sectional charging of the battery is realized.
Description
technical field [0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a charging method based on the constant current-constant voltage output characteristics of a wireless power transmission system. Background technique [0002] Wireless power transmission technology solves the defect of traditional wire direct contact power supply, and is a safe, reliable and convenient power transmission method. The emergence of wireless power transmission technology makes it possible for electrical equipment to get rid of the shackles of cables. The popularization of this "energy Wifi" technology in the future will bring great convenience to people's lives. The development and further breakthrough of this technology will have a profound impact on electric vehicles, medical care, industry, electronics and other fields. [0003] Wireless power transmission is mainly aimed at charging mobile power-consuming equipment, and mobile pow...
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Login to view more IPC IPC(8): H02J50/12H02J7/02
CPCH02J7/025H02J50/12
Inventor 尹有为王泉
Owner XIAN UNIV OF TECH
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