| Wireless energy transfer to get rid of the cable out of the traditional wired mode, the transmitting and receiving ends in a non-contact state to the air as the transmission medium. The improvement program,for the development of energy transmission mode,plays a very important role in promoting the study of wireless transmission of energy now become a hot research topic. After the future of wireless energy transmission network set up, this information is passed to the way the concept of energy transfer is mainly to achieve energy transfer process safety and effectiveness of the transmitting terminal operator for energy transmission and receiving end user remote control of features such as the establishment and implementation needs to be based billing the concept of internet.This article is based on a wireless charging base model, a new study of wireless charging. For wireless charging, we not only improve the efficiency and transmission distance; and the transmission is not received by unauthorized users research directions. Based on this prerequisite, we propose to frequency hopping spread spectrum communication system of wireless energy transfer.Firstly, analog wireless energy transmission system equivalent mathematical model transmission model required on the basis of coupled-mode theory, resonant energy in the system and the division of the field attenuation region was analyzed, as well as highfrequency resonance obtained under conditions high energy transmission efficiency and stability of the system is strong. Simulation based on the actual need for the design, according to the establishment of stable transmission of wireless energy transfer channel conditions, in accordance with the design of the line frequency hopping spread spectrum technology with Matlab simulation, the design of the drive circuit Royer circuit simulation, the receiver circuit. Design a circuit diagram of the transmitter and the receiver and make physical measurements.Secondly, in order to make physical improvements circuit, based on the signal modulation frequency-hopping spread-spectrum technology, the drive circuit used in the transmission side is selected by analyzing the frequency characteristics of the resonant circuit may change the characteristics of the resonance point, with current relay the control circuit is incorporated to control the size of the capacitance value of the resonance point of the circuit. Frequency hopping law of the transmitting and receiving systems are controlled by the same pseudo-random sequence, ensure that the entire system is always in the same transmission frequency.Finally, on the Multisim simulation platform for improved circuit simulation, and a detailed description of the operating characteristics of circuit simulation, simulation includes the transmission distance, the transmission efficiency and the size of the transmission power with no improvement circuit verified by comparing the jump spread-spectrum radiofrequency energy transmission technology feasibility study. |
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