Variable-frequency driving circuit for wireless charging information communication of electric vehicle

Abstract

The invention provides a variable-frequency driving circuit for wireless charging information communication of an electric vehicle, relates to the wireless charging technology and aims to meet the demands of the electric vehicle for rapid, accurate and low-cost wireless charging and accurate positioning. Two ends of a direct current side of a full bridge inversion circuit are connected with a direct-current power supply DC, an alternating current side of the full bridge inversion circuit is connected with a magnetic coupling coil L1, the other end of the magnetic coupling coil L1 is connectedwith a resonant capacitor C1 which is connected with an output end of the alternating current side of the full bridge inversion circuit; a switch K is connected with a resonant capacitor C2 and the direct-current power supply DC, and the resonant capacitor C2 is connected with a common node of the resonant capacitor C1 and the output end of the alternating current side of the full bridge inversioncircuit; a source of a switching tube Q5 is connected with a common node of the switch K and the resonant capacitor C2, and a drain of the switching tube Q5 is connected with a common node of the other end of the magnetic coupling coil L1 and one end of the resonant capacitor C1. The variable-frequency driving circuit has the beneficial effects of being lower in cost, convenient in work, safe andreliable.

Description

technical field [0001] The invention relates to a wireless charging technology. Background technique [0002] At present, the wireless power transmission technology of electric vehicles mainly uses high-frequency coupling magnetic field as the carrier of energy transmission, and energy transmission is carried out through the coupling magnetic field; however, in practical applications, it is necessary to establish wireless communication between the ground charging device and the vehicle. The corresponding relationship between the vehicle; on the other hand, the coordinated control of the ground device and the vehicle body is realized; although the high-frequency wireless communication has the advantages of high reliability and fast transmission speed, it is generally impossible to determine the position information of the ground device and the vehicle body. Correspondence of location; if location information needs to be determined, it can generally be realized by means of las...

AI Technical Summary

Problems solved by technology

[0002] At present, the wireless power transmission technology of electric vehicles mainly uses high-frequency coupling magnetic field as the carrier of energy transmission, and energy transmission is carried out through the coupling magnetic field; however, in practical applications, it is necessary to establish wireless communication between the ground charging device and the vehicle. The corresponding relationship between the vehicle; on the other hand, the coordinated control of the ground device and the vehicle body is realized; although the high-frequency wireless communication has the advantages of high reliability and fast transmission speed, it is generally impossible to determine the position information of the ground device and the vehicle body. Correspondence of location; if location information needs to be determined, it can generally be realized by means of laser radar, video recognition, manual input, etc., but the cost of laser radar is high and it has a great impact on surrounding interference objects; visual recognition is affected by light and lens cleanliness impact, low reliability; manual input work is cumbersome, and the probability of error is high; none of these methods can meet the needs of fast, accurate, low-cost and accurate positioning for wireless charging of electric vehicles; The original magnetic coupling system can better solve the above problems; however, the operating frequency of near-field communication is high, which does not match the power of high-power wireless communication, and new circuits need to be added, resulting in higher costs

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