Power conversion circuit for LCC-S wireless power transmission system

Abstract

The invention discloses a power conversion circuit for an LCC-S wireless power transmission system. The power conversion circuit comprises a high-frequency inverter circuit, a transmitting end resonance circuit, a receiving end resonance circuit and a receiving end power change circuit, the high-frequency inverter circuit is connected with a direct-current power supply, the receiving end resonancecircuit is connected with a load, and the receiving end power change circuit comprises a switching tube S1, a switching tube S2, a switching tube S3, a switching tube S4 and a filter capacitor C2; when the current generated by the receiving end resonance circuit is positive, the switching tube S1, the switching tube S2, the switching tube S4 and the filter capacitor C2 form a boosted circuit; andwhen the current generated by the receiving end resonance circuit is negative, the switching tube S1, the switching tube S2, the switching tube S3 and the filter capacitor C2 form a boosted circuit.According to the circuit, the topological structure of a receiving end power conversion circuit is changed, and the number of devices is reduced; a GaN FET is selected as a high-frequency switching device, so that the switching loss and reverse recovery loss of the high-frequency device are greatly reduced; and a synchronous rectification technology is adopted, so that the conduction loss of the device is further reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a power conversion circuit used in an LCC-S wireless power transmission system. Background technique [0002] Wireless power transmission is a technology that does not require electrical connections for power transmission. It can overcome the problems faced by traditional wired power transmission technologies in use, such as avoiding insulation aging and poor contact that may be caused by exposed connecting wires, and improving the safety of power transmission. sex. In the field of electric vehicles, it has a good application prospect, which can make the charging of electric vehicles more flexible and convenient, especially the dynamic wireless power transmission technology, which helps to solve problems such as mileage anxiety. [0003] The LCC-S resonant compensation topology is a kind of magnetically coupled resonant wireless power transmission...

AI Technical Summary

Problems solved by technology

In a traditional wireless power transmission system, a diode uncontrolled rectifier and a DC chopper circuit are usually used to form a power conversion circuit at the receiving end. The circuit is simple to control, but the number of components is large, and the loss in high-frequency and high-power occasions such as wireless charging of electric vehicles is relatively large. Large, not conducive to the promotion of wireless power transmission technology

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