Study On Load Detection And System Modeling Simulation For Region Controllable Contactless Power

With the advancement of technology and the improvement of living standards, household appliances and office equipment, especially portable devices, become increasingly popular. The traditional power supply method by directly connecting wires has been unable to satisfy the needs of people's lives. With the long-term use, poor contact may occur and cause the security risks. It will be very inconvenient when more than one equipments need to be supply power at the same time. Zoning Contactless Power Transfer Plate (ZCPTT) Based on the Inductive Coupled Power Transfer Technology (ICPT) is a simple structure, high transmission efficiency and easy-to-use power supply solutions for portable devices.This paper is founded by key fund project of Science & Technology department of Chongqing, mainly concentrates on ICPT technology and the load recognition and power supply of ZCPPT.In the paper, research status and significance of ICPT and the wireless charging technology for portable devices is briefly introduced. The principle, basic structure and working process of ZCPPT are analyzed later. And have introduced the basic concepts of RFID technology and theory, focuses on analyzing the working principle of RFID systems, as well as the basic principles of data transmission and energy transfer between readers and transponders.Then load identification methods in common use have been analyzed. Combining with the specific characteristics and requirements of ZCPPT, proposed a sub-regional recognition program based on the RFID, and designed the load identification module including circuit design, antenna design and software design. Hardware design mainly focused on analysis of RF interface circuit design. Antenna design techniques have been also studied. Discussed design steps and issues such as magnetic shielding and PCB layout. In software design, firstly set out the design idea and analyzed the work flow of load identification module and read-write operation of electronic tag reading and writing process in detail. And then, by analyzing CRC checksum and anti-collision algorithm, multi-load identification problem have been studied, and given practical program based on the MF RC522 in last.Circuit topology of ZCPPT is studied and established. The equivalent circuit model is also built with mutual inductance concept. And then studied theoretically load variation impact on the primary resonant frequency, output power and voltage. At last, the system has been simulated with Matlab's Simulink tool to verify the designed circuit parameters and study impact on the system while the power devices move in or out of the effective identification regional of ZCPPT and equivalent load of the devices changes.