The Design Of Resonant Wireless Power Transmission System Based On Magnetic Coupling

With the rapid development of electronic technology, mobile phones, digital cameras an-d other handheld devices appear in our life increasingly. The demand of electronic equipment is more than just functional, Features of convenient, beautiful, clean and safe gradually beco-me a new measurement standard to buy electronic products. Straight charger is given priority to the charging mode of traditional electronic equipment, which inevitably lead to line aging, and device is not beautiful and safe, and there are compatibility problem of different types of handheld devices such as charging interface. Wireless power supply technology can solve the above problems, the magnetic coupling based on the basic electromagnetic induction and resonance coupling is a new type of electric power transmission technology in power tran-smission, with the character of long distance and stable transmission power, which overcomes the disadvantages of the traditional cable transmission. It has the milestone significance and value in the human history of electricity.Firstly, this paper introduces three kinds of the working principle of wireless charging and expounds the process of the wireless charging based on magnetic coupling and resonance and the principle of the receiver signal back technology. Take the STM32 as the core contro-ller, we design the power transmission circuit, and take the STM 8 as the CPU, we design the energy receiving and signal processing circuit. By using the method of combining wireless power transmission and signal carrier, this pepper realizes the topic of this article:The design of resonant wireless power transmission system based on magnetic coupling.This paper takes power forward transmission and signal reverse back as the main line. The power transfer part mainly includes:signal generating circuit, drive circuit, dc inverter, electromagnetic energy conversion, rectifier and filter, etc. The STM32 produces dual compl-ementary PWM signals to drive the H bridge, which is based on electromagnetic energy trans-formation in order to translate into high frequency alternating current and couple the energy of magnetic from the primary coil to the secondary coil,and the rectifier voltage regulator ou-tput give to batteries. Signal back sending part mainly includes the signal modulation and the signal demodulation, the receiver take the STM8S as the control core, and send the charging status to the receiver coil by using ASK technology. The system can automatically determine the charging status and break the power, and accomplish the process of energy transfer and signal back.This design completed the process of power wireless transmission and completed the feedback part of the system through the carrier technology transfer the charging state of the battery to the main controller and improved the reliability and practicability of the system, provided the reference for the engineering design scheme.