A resonant frequency configuration method for a dual-coil wireless power supply system based on eigenvalues

Abstract

The present invention relates to the technical field of wireless power supply, and specifically discloses a resonant frequency configuration method of a dual-coil wireless power supply system based on eigenvalues. The method first establishes a second-order time-domain model of the dual-coil wireless power supply system based on the KVL theorem (step S1); Then, use the eigenvalue principle to obtain the calculation formula of the natural frequency of the system, and solve the calculation formula to obtain the original and secondary resonance capacitance C 1 、C 2 The equations, further by substituting known parameters, solve the primary and secondary resonance capacitance C 1 、C 2 different value combinations (step S2); then, based on different value combinations, use simulation to obtain the relationship curve of magnetic field excitation frequency, output current, and charging efficiency (step S3); finally, by analyzing these relationship curves, According to the actual system requirements, determine the optimal primary and secondary side resonant capacitor C 1 、C 2 value, and the optimal actual operating frequency of the system.

Description

technical field [0001] The invention relates to the technical field of wireless power supply, in particular to a method for configuring the resonance frequency of a dual-coil wireless power supply system based on eigenvalues. Background technique [0002] Wireless power transmission has been widely used in electric vehicles, medical equipment and household appliances due to its broadness and flexibility of application conditions. The resonant frequency of a wireless power transfer system is defined as the power supply frequency at which the system output power peaks. Due to the change of the coupling strength of the wireless power transmission system, the number of resonance frequencies of the system changes, and this phenomenon is called frequency splitting. The two-coil system can obtain the conditions for frequency splitting through coupled mode theory and circuit theory. At present, the modeling methods of wireless power supply systems usually include coupled mode theo...

AI Technical Summary

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

Images