| With the scale of China's power system expanding year by year,in order to promote the construction of information power grid engineering and achieve the purpose of safety protection,the management department has begun to install smart locks for power equipment.This kind of smart lock can implement remote control and management of the lock through computer or mobile phone,authenticate user identity to prevent key theft or theft,record user operation history to clarify management responsibility and remote communication to upload the operation process to the computer management system in real time.Therefore,compared with the traditional mechanical lock,the power intelligent lock has stronger practicability and higher security.It greatly improves work efficiency and facilitates centralized supervision of power grid.Nowadays,the most commonly used electric smart locks are powered by built-in batteries or external wired power supply.This active power supply mode has some drawbacks.Replacing aging batteries increases workload and cost,and the daily maintenance operation of distribution network is complicated,which may require power outage treatment.As a new way of power transmission,?ireless Charging System has the advantages of energy saving,environmental protection and non-contact Charging to ensure the power security of distribution network.In the future,it will become the first choice of power supply with intelligent lock.This paper first introduces the principle and application of three kinds of power transmission technology,especially focuses on the electromagnetic induction coupling radio energy transmission,the functional requirements and performance design requirements of wireless charging system for electric smart lock are analyzed,Matlab simulation software is used to study the influence of working frequency and coupling coefficient on output power and transmission efficiency.Then,the circuit structure of the energy receiving and transmitting units and the signal feedback and adjustment process between the two units are introduced in order to provide theoretical basis for the subsequent circuit module design.The selection of compensation network is also studied and analyzed,and the S-S type compensation structure suitable for this design is obtained under the verification of the simulation circuit built on Matlab/Simulink platform.Then,the coupling element is designed to analyze the coil material,shape,resistance,selfinductance and mutual inductance,coupling coefficient and quality factor.The method to improve the efficiency of the system is obtained by studying the coil characteristics.ANSYS Maxwell software was used to do finite element simulation to study the influence of coil offset,and analyze the magnetic field intensity distribution and the change of mutual inductance and coupling coefficient in axial and radial offset directions.Magnet coupling structure is proposed to solve the problem of offset loss.During charging,magnets are used to guide the alignment of transceiver coil.Simulation results show that the coupling performance is less affected by the magnet structure.In addition,ferrite separator is designed to reduce magnetic leakage and improve transmission efficiency.Finally,the control chip of sending unit and receiving unit suitable for power intelligent lock is selected,the peripheral circuit is designed,and the communication process is introduced.To verify the feasibility of the system,an electric intelligent lock test platform is built.A series of performance and reliability tests of the wireless charging system are carried out on this test platform.The research content of this paper can promote the upgrade and promotion of electric intelligent lock.Figure[90]Table[17]Reference[64]... |
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