A Calculation Method of Electrical Performance Parameters of Wireless Charging Coil Self-Inductance and Mutual Inductance

Abstract

The invention provides an electrical performance parameter calculation method of wireless charging coil self-inductance and mutual inductance, and belongs to the field of new energy vehicles and electromagnetism. The method comprises the steps of firstly obtaining a zoom table of a self-inductance function, a self-inductance correction coefficient, a mutual inductance function and a mutual inductance correction coefficient of coils in different shapes; obtaining geometrical parameters, including the coil size, the wire radius, the number of turns of the coil, the longitudinal distance betweentwo coils and the transverse offset between the two coils, of any coil to calculate dimensionless parameters; utilizing the geometrical parameters and the dimensionless parameters to obtain the self-inductance function, the self-inductance correction coefficient, the mutual inductance function and the mutual inductance correction coefficient according to the coil shape through the zoom table; finally utilizing a formula to calculate to obtain electrical properties, including the self-inductance coefficient, the mutual inductance coefficient and a mutual inductance coupling coefficient, of thecoil. By utilizing the geometrical parameters of the coil and through table look-up and formula calculation, an accurate calculation result of the self-inductance coefficient and the mutual inductancecoefficient of the coil can be obtained, and the method is simple and has very high popularization value.

Description

technical field [0001] The invention belongs to the field of new energy vehicles and the field of electromagnetism, in particular to a method for calculating electrical performance parameters of the self-inductance and mutual inductance of a wireless charging coil. Background technique [0002] As the energy density of batteries continues to improve, the driving range of electric vehicles may no longer be an issue. However, how to transfer electric energy from the grid to the vehicle will become a bottleneck in the promotion of electric vehicles. Electric vehicle power battery charging presents the following types of solutions: wired charging, battery replacement and wireless energy transmission (wireless charging). [0003] Wireless energy transmission refers to the use of electromagnetic induction principles or other related AC induction technologies to achieve power transmission over a certain distance without the use of wires. The unique advantages of wireless charging...

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Problems solved by technology

[0005] At present, the commonly used calculation methods for coil self-inductance and mutual inductance are: 1. Calculation by empirical formula: In this calculation method, the empirical formulas for calculating self-inductance and mutual inductance are mostly for circular coils, and for other shapes such as square coils. It is difficult to calculate, and some formulas are complicated to calculate; 2. Calculate by establishing a magnetic field model: this method has a large amount of calculation and a complicated process, and is not suitable for engineering technology applications

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