Three-level and adjustable LCC resonance wireless charging system

Abstract

The invention discloses a three-level and adjustable LCC resonance network wireless charging system. The system comprises a ground unit and a vehicle-mounted unit, and the ground unit comprises a three-level circuit, a ground adjustable LCC resonance network, a ground transmitting unit and a ground control unit coupled with the three-level circuit and the ground adjustable LCC resonance network, wherein the three-level circuit, the ground adjustable LCC resonance network and the ground transmitting unit are sequentially coupled; the vehicle-mounted unit comprises a vehicle-mounted receiving unit, a vehicle-mounted adjustable LCC resonance network, a synchronous rectification circuit and a vehicle-mounted control unit which are coupled in sequence, wherein the vehicle-mounted control unit is coupled with the vehicle-mounted adjustable LCC resonance network and the synchronous rectification circuit. The ground / vehicle-mounted adjustable LCC resonance network comprises a variable capacitor for adjusting the capacitance value based on a power tube, and the ground / vehicle-mounted control unit changes the capacitance value of the variable capacitor by controlling the duty ratio of the power tube, so that the ground / vehicle-mounted unit works in a magnetic coupling resonance state. In the magnetic coupling wireless charging process of the electric vehicle, under the condition that thecoil offset, the input voltage and the load change greatly, efficient charging is ensured, and the energy conversion loss is reduced.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a three-level and adjustable LCC resonant wireless charging system. Background technique [0002] With the increasingly severe energy and environmental problems, electric vehicles are widely accepted and used by people due to their advantages of environmental protection and energy saving. The wireless charging system for electric vehicles has gradually attracted the attention of the public due to its advantages of safety and convenience. Making both the on-board unit and the ground unit of the electric vehicle wireless charging system work in the state of magnetic coupling resonance has practical significance for improving the anti-offset capability of the wireless charging system and improving the efficiency of wireless power transmission. Moreover, when the input power of the wireless charging system is a high-power power supply, the commonly used power tubes used in the wirel...

AI Technical Summary

Problems solved by technology

Moreover, when the input power of the wireless charging system is a high-power power supply, the commonly used power tubes used in the wireless charging system will burn out, and a power tube with a higher voltage can withstand a small current. If a high-current power tube is used, the price will be lower. It is 4-10 times more expensive than commonly used power tubes, and the cost is too high to gain competitiveness in the market. Moreover, the commonly used circuits cannot realize zero-voltage turn-on power tubes, and the power tubes are subjected to greater voltage stress.

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