Anti-offset llc-s type wireless power transfer system and its parameter design method

Abstract

The invention discloses an anti-offset LLC-S type wireless power transmission system and a parameter design method thereof. The anti-offset LLC-S type wireless power transmission system comprises a full-bridge inversion module, an LC filtering module, a primary side LLC compensation network, a transmission coil, a secondary side compensation network and a load; the full-bridge inversion module cangenerate high-frequency alternating-current square waves to provide electric energy input for the wireless electric energy transmission system; the LC filtering module is connected with the full-bridge inversion module and the primary side LLC compensation network and can filter out harmonic components, except for fundamental frequency components from input square waves; and the primary side LLCcompensation network is connected with a primary side coil in the transmission coil. element parameters are designed for the primary side LLC compensation network through a proper method, so that thewireless power transmission system can maintain the relative stability of the output power of the system in a wide coupling coefficient range. The secondary side compensation network and a secondary side coil in the transmission coil form series resonance; and finally electric energy is transmitted to the load. The system provided by the invention realizes stable power output in the relatively wide coupling coefficient range, and is beneficial to the improvement of an anti-offset capability.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, in particular to an anti-offset LLC-S type wireless power transmission system and a parameter design method thereof. Background technique [0002] The magnetic coupler is usually used as the carrier of the wireless power transmission system to realize the energy transmission from the transmitting end to the receiving end. During the static charging process, it is often difficult to achieve complete alignment between the transmitting coil and the receiving coil. In general, the larger the offset between the coils, the smaller the coupling coefficient. At the same time, the change of the coupling coefficient will directly cause the reflection impedance to decrease by the square multiple, which will further cause the output of the wireless power transmission system to fluctuate greatly. . At the same time, compared with static charging, dynamic wireless charging needs to...

AI Technical Summary

Problems solved by technology

When the mutual inductance between the coils changes due to the physical offset of the coils, that is, the coupling coefficient between the coils changes, the wireless power transfer system can still achieve the fluctuation of the output power within an allowable error range through the self-regulation of the compensation network, thus Solve the problem that the output power of the system fluctuates greatly when the coil is offset in the traditional LLC-S wireless power transmission system

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