The Research On Power Converter Based On Contactless Inductively Coupled Power Transfer Technology

Inductively Coupled Power Transfer technology is a new developing non-contactpower transmission technology,which delivers power efficiently from a stationaryprimary source to one or more secondary pick-ups by means of modern powerelectronics energy conversion technology,magnetic coupling technology and moderncontrol theory and microelectronic control technology.The ICPT technology has betterperformance than traditional power tansmission method,such as nosparking,maintenance free,dustproof and waterproof. It can be widely used incontactless battery charging for human implantable electronic devices, underwateroperations, especially in mining wells,flammable and explosive high-riskenvironment.Under the circumstances of global energy nervous, ICPT technolog y inthe electric vehicle power supply has a broad prospect of application.This dissertation first introduced the origin of the ICPT technology and thepresent situation of domestic and foreign scholars research on this emergingtechnology, key technologies to realize the new power supply mode, and the researchsignificance and the development prospect of the technology.Loosely coupled transformer,which is a important energy transmission part inInductively Coupled Power Transfer system,was introduced and analyzed in thedissertation.The loosely coupled transformer’s leakage inductance, mutual inductance,magnetic circuit model and its loose coupling coefficient were also listed. The circuitcharacteristics and parameters were analyzed in the case of th e single load on ICPTsystem as a research premise. Considering the leakage inductance of the transformerand the low coupling coefficient, compensation of ICPT system was discussed,whichcan improve the system transmission power.This paper mainly gived the circuit topology analysis on ICPT system with oneside of a high frequency inverter circuit and designed the LCC type constant currentfull bridge inverter circuit topology and optimized the design of the resonantparameters. Its validity is verified by simulation experiments. The Simulation resultsshow that the circuit has good effect of a constant current. According to the actualdemand,the power load characteristics can be a source of current source type or avoltage type.Finally, Considering the ICPT system’s access to load more than one, load or other circuit parameters, can make the system working frequency at the ratedfrequency and lead to reduce the ICPT system transmission efficiency. In order tosolve the problem, this paper designed a frequency adaptive control scheme based onphase-locked loop and the simulation results show that the proposed scheme has goodeffect on frequency tracking.