Design Of High-power Inductive WPT Digital Inverter Power Supply

Wireless power transfer frees electrical equipment from the shackles of electrical wire.Its flexible,efficient,and convenient power supply characteristics make this technology gradually become a powerful supplement under the special conditions of traditional contact power transfer,and has received wide attention in many fields such as trams,electric vehicles,and factory automation.Trams need to rely on pantograph contacts to supply power during operation,this power supply method will cause severe wear on the contact end.If the pantograph is not replaced in time,it will lead to a decline in power supply quality and even serious accidents such as power failure.The use of wireless power transfer can replace the traditional pantograph to power trams,and providing a new set of power supply strategies for trams.However,the application of wireless power transfer to the trams also creates some new problems.The tram will inevitably vibrate and misalignment,which will causing the relative position of the coupling coil to change.When the coupling coil deviates from the optimal working position,the transfer power and efficiency will be greatly reduced.If the corresponding adjustment is not made in time,it will be difficult to continue to operate stably and reliably.In view of the above problems,this thesis designs a high-power digital inverter power supply that uses the multi-objective particle swarm optimization algorithm to calculate the optimal working state and adjusts the system in real time through the power and efficiency synchronization improvement method.First,this thesis analyzes the working principle of the inductively coupled power transfer system based on circuit theory,obtains the relationship between mutual inductance and transfer power,and finds the maximum transfer power point under different mutual inductances.On this basis,in order to improve the output power and efficiency,a method for synchronous improvement of power and efficiency was proposed.Through the coordinated control of the inverter frequency and the adjustable resonance network,the system working state can be changed more flexibly.Secondly,in order to improve the transfer power,transfer efficiency and operating stability of the system.This thesis uses a multi-objective particle swarm optimization algorithm which was used to quickly and accurately solve the operating frequency and the resonant network capacitance of the system at the optimal operating state,and guide the implementation of method for synchronous improvement of power efficiency.While maintaining a large power output,the system has higher transfer efficiency and a smooth adjustment process.Finally,based on the practical application of trams,a digital inverter power supply for a high-power inductive wireless power transmission system was set up,and the design process of each part of the inverter power supply and the software process for implementing the functions of the inverter power supply were introduced in detail.The experimental results show that after the relative displacement of the coupling coil,the multi-objective particle swarm optimization algorithm can be used to quickly calculate and make corresponding adjustments to the system,which improves the transfer power efficiency and operating stability of the system,and ensures that the tram can run safely and stably.