Adjustable wireless charging system

Abstract

The invention discloses an adjustable 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,the transmitting end resonance network at least comprises a transmitting coil and a first capacitor, the receiving end is provided with a receiving end resonance network, and the receiving end resonance network at least comprises a receiving coil and a second capacitor. The system further comprises correction devices which are respectively a transmitting end correction capacitor, a receiving endcorrection capacitor, a transmitting end correction inductor and a receiving end correction inductor; the transmitting end correction capacitor is connected with the first capacitor in parallel and provides a variable capacitance value for the transmitting end; the receiving end correction capacitor is connected with the second capacitor in parallel and provides a variable capacitance value for the receiving end; the transmitting end correction inductor is connected with the transmitting coil in series and provides a variable inductance value for the transmitting end; the receiving end correction inductor is connected with the receiving coil in series and provides a variable inductance value for the receiving end; the driving frequency of an input source of the transmitting end resonance network, the resonance frequency of the transmitting end resonance network and the resonance frequency of the receiving end resonance network are all 79kHz-90kHz. According to the adjustable 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 devices,so that 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 an adjustable 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 co...

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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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