Wireless charging system

Abstract

The invention discloses a wireless charging system, which is divided into a transmitting end and a receiving end; the transmitting end is provided with a transmitting end resonance network, wherein the transmitting end resonance network at least comprises a transmitting coil and a first capacitor; a receiving end resonance network is arranged at the receiving end, wherein the receiving end resonance network at least comprises a receiving coil and a second capacitor; at least one end of the transmitting end and the receiving end is provided with a correction device, and the correction device isone or two of a correction inductor and a correction capacitor; when the correction device is the correction inductor, the correction device is connected with the transmitting coil or the receiving coil in series; and when the correction device is the correction capacitor, the correction device is connected in parallel with the first capacitor or the second capacitor. According to the wireless charging system, the total capacitance value or the total inductance value of the transmitting end resonance network and the receiving end resonance network is adjusted through the correction device, sothat the resonance stability is ensured, the interference of an environmental electromagnetic field is reduced, and the maximum efficiency transmission and the minimum interference noise are obtained.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a wireless charging system. Background technique [0002] Wireless charging is a non-contact energy transmission method, which can realize the safe and efficient use of energy. Especially for electric vehicles with automatic driving and automatic parking, wireless charging can effectively support the whole process of unmanned operation of the vehicle. It is a new energy An important direction of automobile development. The wireless transmission of electric energy is realized by exciting the alternating electromagnetic field. In order to obtain greater power transmission, it is necessary to increase the strength of the electromagnetic field; on the other hand, because the electromagnetic field energy is excited in an open space, wireless charging will inevitably involve Electromagnetic compatibility (EMC) issues. [0003] Patent CN110126648A "Self-optimized tuning control method...

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Problems solved by technology

[0003] Patent CN110126648A "Self-optimized tuning control method for electric vehicle wireless charging maximum current tracking" proposes a method of adjusting the operating frequency of the inverter to obtain the maximum output current through frequency conversion control, because the frequency conversion adjustment will make the voltage and current contain Abundant high-order harmonics, and the composition of the harmonics is very complex due to the frequent adjustment of the operating frequency. The electromagnetic noise energy of these harmonics will form electromagnetic interference through circuit connection or electromagnetic wave space coupling, which will cause great damage to the system itself and the surrounding environment. EMC problems

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