Electric vehicle wireless charging device with battery energy balancing function and control method thereof

Abstract

The invention discloses an electric vehicle wireless charging device with a battery energy balancing function and a control method thereof. The electric vehicle wireless charging device comprises a power supply side circuit, a receiving circuit and a balancing circuit. The power supply side circuit comprises a first rectifying circuit, an LC filter circuit and an inverter circuit, the power frequency power supply AC is connected with the first rectifying circuit, the first rectifying circuit is connected with the LC filter circuit, the LC filter circuit is connected with the inverter circuit, and the inverter circuit is connected with the transmitting coil L1. The receiving circuit comprises a second rectifying circuit, a variable capacitor and a series battery pack, the receiving coil L2 is connected with the second rectifying circuit, the second rectifying circuit is connected with the variable capacitor, and the variable capacitor is connected with the series battery pack. The equalization circuit comprises an equalization unit and a switch array, the equalization unit is connected with the switch array, and the switch array is connected with the series battery pack. According to the wireless charging device and the control method, energy balance can be carried out on the battery pack while charging is carried out, so that energy loss caused by the process of charging first and then balancing is reduced, and the wireless charging device and the control method have the advantages of being convenient to use, safe, reliable, rapid and convenient.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle charging, and in particular relates to a wireless charging device for electric vehicles with a battery energy balancing function and a control method thereof. Background technique [0002] Nowadays, new energy vehicles powered by lithium batteries have been widely used. The plug-in charging method requires connector matching, and is limited by the location and distance of the charging pile, which is prone to safety hazards. The wireless charging method can carry out non-contact charging, which greatly improves the safety and convenience. However, there are also some problems. The primary and secondary coils cannot be matched very well, resulting in low charging transmission efficiency. The transmission power of wireless charging is not large enough. Wireless charging on electric vehicles is generally slow charging. This power meets the demand, but it takes much longer than traditional t...

AI Technical Summary

Problems solved by technology

If you continue to drive at this time, the exhausted battery will face the problem of overuse of the battery, which will shorten the battery life and shorten the service life of the electric vehicle, so you should stop driving at this time, and the mileage of the new energy vehicle will be limited.

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