Electric car segmented dynamic wireless power supply system with low receiving power fluctuation

Abstract

The invention discloses an electric car segmented dynamic wireless power supply system with low receiving power fluctuation. The system is composed of a fixed-frequency high-frequency power supply, a primary side graded and controllable compensation capacitor, a segmented and controllable primary coil, a switching control switch, a secondary coil, a secondary side fixed compensation capacitor and an electric car load. On the condition that the working frequency of the power supply is not changed, it is guaranteed that the receiving power is always in a high level only through topological transformation of transmission coils and switching of compensation resonance capacitors, and it is guaranteed that when a receiving coil moves to the position between two primary coils, little receiving power fluctuation is generated. The problems that in an electric car, batteries are low in energy density and needs to be frequently charged, and an energy storage batteries are heavy and high in cost are solved, the requirement that electric energy is dynamically supplemented to the electric car in the driving process can be met, and the electric car can load few energy storage batteries or does not load the energy storage batteries by adopting the scheme.

Description

technical field [0001] The invention relates to the field of wireless charging for electric vehicles, in particular to a segmented dynamic wireless power supply system for electric vehicles with low fluctuations in received power. Background technique [0002] With the rapid development of electric vehicles, automobiles are gradually getting rid of their dependence on fossil energy, from traditional vehicles to hybrid vehicles, and finally to pure electric vehicles. However, the energy density of on-board batteries is still difficult to compare with that of gasoline. Although with the continuous advancement of electric energy storage technology, lithium-ion batteries have gradually replaced lead-acid batteries, and some problems have been improved. Electric vehicles still need large and heavy battery packs as power. Energy storage equipment, and the relatively limited battery life of electric vehicles are still key factors restricting the development of electric vehicles. ...

AI Technical Summary

Problems solved by technology

However, for the dynamic wireless power supply scheme for electric vehicles with a short segment structure, when the secondary coil is located in the middle of the two primary coils, if only a single primary coil is used for power supply, it is difficult to maintain a high level of reception due to large changes in the mutual inductance parameters. Power; if the short segment coils are all energized, the system loss will be greater

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