| Mobile wireless power transmission system is applied to Automated Guided Vehicle(AGV),which can greatly improve the work efficiency in the workshop.However,coupling fluctuations will inevitably occur in the process of mobile wireless power transmission in the track structure based on array or dual magnetic pole,which will cause current fluctuation and efficiency decline at the output end,which will endanger the security and stability of AGV mobile wireless power transmission system.Based on the stability,efficiency and economy of mobile transmission,this paper provides a new method for the design of mobile wireless power transmission system for AGV mobile.This paper conducts the following research:Firstly,aiming at the problem of output fluctuation caused by the instability of magnetic coupling in the process of AGV mobile radio energy transmission,a new optimal parameter design scheme for loose-coupling transformer is proposed.Based on the mutual inductance equivalent model of loose-coupling transformer,the influence of secondary side coil structure,primary side coil arrangement,coil placement position and other factors on the performance of loose-coupling transformer was studied by using Ansoft finite element simulation tool.The aim is to realize the stability of coupling coefficient in the process of AGV wireless power transmission and improve the economy of loose-coupling transformer.Secondly,in order to realize efficient and stable energy transmission,impedance analysis is used to analyze the LCC-S model of primary and secondary asymmetric compensation circuit.Compared with the basic compensation circuit,the compensation parameters of this circuit are less sensitive to the circuit parameters,and have higher output efficiency and stable output characteristics,ensuring efficient and stable energy transmission.Modeling analysis of the circuit under special conditions,when the side circuit is missing or open,the original side circuit can still work stably,to improve the stability of the circuit under special conditions.In addition,in order to meet the demand of AGV constant current power supply,the method of Buck circuit and closed-loop control strategy is proposed to accurately adjust the output current in real time.In order to avoid voltage and current shock to the primary and secondary sides of the system when the secondary circuit is started,a soft start design scheme of the secondary side is proposed by means of simulation analysis of the starting process to realize the slow increase of the output current when the secondary side is started,so as to ensure the safety and reliability of the system.Finally,the loose-coupling transformer is built and the stability of the coupling coefficient in the moving process of the side side of the loose-coupling transformer is verified,which proves the rationality of the optimal parameter design scheme of the loosecoupling transformer..The experimental results show that the output current of LCC-S compensation circuit is constant and not affected by the load change,which guarantees the stability of energy transfer.The soft start of the secondary side can effectively avoid the impact of voltage and current on the components and ensure the safe and reliable operation of the system,which verifies the feasibility of the theoretical analysis and the proposed scheme. |
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