Resonant frequency configuration method of dual-coil wireless power supply system based on characteristic value

Abstract

The invention relates to the technical field of wireless power supply, and particularly discloses a resonant frequency configuration method for a dual-coil wireless power supply system based on a characteristic value. The method comprises the steps: firstly building a second-order time domain model of the dual-coil wireless power supply system based on a KVL theorem (step S1); then, obtaining a calculation formula of the natural frequency of the system by using a characteristic value principle, solving the calculation formula to obtain an equation set for solving the primary and secondary side resonant capacitors C1 and C2, and further substituting known parameters to obtain different value combinations of the primary and secondary side resonant capacitors C1 and C2 (step S2); then, on the basis of different value combinations, obtaining relation curves of the magnetic field excitation frequency and the output current and the charging efficiency (step S3) by utilizing simulation; and finally, by analyzing the relation curves, according to actual system requirements, determining the optimal values of the primary and secondary resonant capacitors C1 and C2 and the optimal actual working frequency of the system.

Description

technical field [0001] The invention relates to the technical field of wireless power supply, in particular to a resonant frequency configuration method of a dual-coil wireless power supply system based on eigenvalues. Background technique [0002] Wireless power transmission has been widely used in fields such as electric vehicles, medical equipment and household appliances due to its broad and flexible application conditions. The resonant frequency of a wireless power transfer system is defined as the power frequency corresponding to the peak output power of the system. Due to the change of the coupling strength of the wireless power transmission system, the number of resonant frequencies of the system changes, and this phenomenon is called frequency splitting. The condition of frequency splitting can be obtained by coupling mode theory and circuit theory for two-coil system. At present, the modeling methods of wireless power supply systems usually include coupled mode t...

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Problems solved by technology

The above three ways to find the resonance point of the system are usually to calculate the power and efficiency expressions of the system to find the frequency at the power extreme point as the resonance frequency of the system, but this method does not consider power and efficiency comprehensively. When the power is high, the transmission efficiency of the system is sacrificed, and because the influence factors of the primary side resonant capacitor and the secondary side resonant capacitor on the system are not considered, the extreme power at the resonant frequency obtained is often not the maximum that the system can achieve through configuration parameters. best power

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