Wireless charging system and wireless charging device

Abstract

The invention relates to the technical field of wireless charging, in particular to a wireless charging system and a wireless charging device. A power supply unit of the wireless charging system comprises a transmitting coil; a charging unit comprises a receiving coil, a secondary side controller and a rectifier used for being connected with a battery; a first MOS transistor is arranged between the positive electrode of the rectifier and the positive electrode of the battery, and/or a second MOS transistor is arranged between the negative electrode of the rectifier and the negative electrode of the battery; the secondary side controller is in sampling connection with the rectifier and the battery; when an output voltage of the rectifier is lower than a voltage of the battery, the first MOStransistor is controlled to be cut off, so that the backward flowing phenomenon of the battery is prevented; and when the voltage of the battery is negative, the second MOS transistor is controlled to be cut off, so that the reverse connection phenomenon of the battery is prevented. MOS is good in interference resistance and relatively low in power consumption, so that when the prevention of reverse connection and/or backward flowing in wireless charging is realized, the problems of excessively high loss and/or relatively low reliability in the process of realizing the prevention of the reverse connection and/or the backward flowing by adopting a diode or a relay in a current charging technology are solved.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a wireless charging system and a wireless charging device. Background technique [0002] With the steady advancement of the national new energy electric vehicle strategy, new energy electric vehicles ushered in explosive growth, and the problem that electric vehicles have to solve is the problem of charging. At present, most of the mass-produced pure electric vehicles are used in the market. Wired charging solutions are rarely used in wireless charging. Wireless charging can solve the cumbersome charging and plugging operation. It is convenient and quick to charge as you go, and can reduce the cost of many charging stations. Therefore, wireless charging will become a future trend. Wireless charging is not widely used. On the one hand, the conversion efficiency needs to be improved, and on the other hand, the circuit design needs to be improved. [0003] The patent lite...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a wireless charging system and a wireless charging device to solve the problem of excessive loss and / or low reliability in the current charging technology using diodes or relays to achieve anti-reverse connection and / or anti-backfeeding process

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