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WPT system impedance matching method based on GA-BP algorithm

A GA-BP, impedance matching technology, applied in electrical components, circuit devices, etc., can solve the problem of reduced impedance matching accuracy, and achieve the effect of wide impedance matching range, high accuracy and fast speed

Inactive Publication Date: 2021-09-24
WUXI VOCATIONAL & TECHN COLLEGE
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Problems solved by technology

[0004] In view of the above-mentioned technical deficiencies, the present invention uses an equivalent circuit model to derive the optimal load condition, and aims at the problem that the impedance matching accuracy of the rectifying load is nonlinearly reduced, by introducing a matching factor and a programmable capacitor array (PCA), At the same time, combined with the control strategy of genetic algorithm plus backpropagation (GA-BP) neural network, the CLCC network is designed to achieve high-precision and wide-range impedance matching, so as to ensure that the WPT system always tracks the maximum transmission efficiency point

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  • WPT system impedance matching method based on GA-BP algorithm
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  • WPT system impedance matching method based on GA-BP algorithm

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Embodiment

[0053] Such as figure 2 As shown, it is the equivalent circuit model of the main circuit of the double-coil S-S topology of a typical MCR-WPT system. The centers of the two coils are the same, and the transmitting end is connected to the AC voltage source u i , the receiving end is connected to the equivalent load resistance R o , R i , L i and C i They are the equivalent series resistance, self-inductance and resonance capacitance of the resonant coil respectively, wherein the subscript i=1, 2, 1 indicates the transmitting coil, and 2 indicates the receiving coil. When the two coils are in resonance, AC voltage u 1 with angular frequency ω 0 =2πf o . M is the mutual inductance between the transmitting coil and the receiving coil.

[0054] According to Kirchhoff's voltage law, the equivalent model column loop equation can be obtained:

[0055]

[0056] in are the input voltage U 1 , current i 1 and i 2 The phasor value of Z 1 and Z 2 is the equivalent imp...

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Abstract

The invention discloses a WPT system impedance matching method based on a GA-BP algorithm. The method comprises the steps that a transmitting end and a receiving end establish communication, a transmitting end controller sends an initialization command to the receiving end, transmits an initial set value to the receiving end, and introduces a matching factor XC; the transmitting end controller calculates a coupling coefficient value k in real time in combination with the current XC of the system, the equivalent input resistance Ra of the rectification load, the voltage u1 of the alternating current power supply and the current i1, and determines the value of the optimal load impedance Ro-Opt in combination with a formula; k and Ro-Opt are transmitted to the receiving end controller, and an optimal matching factor XC value is determined by detecting Ra and rectification load equivalent input reactance Xa in combination with a formula; and the receiving end controller adjusts the PCA network by using the GA-BP neural network to realize adjustment of capacitors Cb1, Cb2 and Cb3 in the impedance matching network so as to ensure that the WPT system always keeps working with the maximum transmission efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless charging systems, in particular to a WPT system impedance matching method based on a GA-BP algorithm. Background technique [0002] The patent of the present invention discusses the key factor for maintaining a high transmission efficiency of a magnetically coupled resonant wireless power transfer system (Magnetically-Coupled Resonant Wireless Power Transfer, MCR-WPT)—impedance matching. In order to ensure that the WPT system maintains the highest transmission efficiency, it is necessary to adjust the equivalent load to the optimal load. It is a common method to add a passive or active impedance matching network at the receiving end of the WPT system. Aiming at the impedance matching problem under the maximum efficiency tracking of the wireless power transfer (WPT) system, by introducing matching factor and programmable capacitor array (Programmable capacitor array, PCA), combined with genetic al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/80H02J50/12
CPCH02J50/80H02J50/12
Inventor 冯宏伟刘全胜刘媛媛单正娅
Owner WUXI VOCATIONAL & TECHN COLLEGE
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