Research And Design Of Single-Phase Isolated Soft-Switching Inverter Power System For Special Vehicles

After 20 years of development,the ordinary vehicle-mounted inverter power supply is very mature.The 12V DC output of the battery is converted into 220V/50Hz AC,and the power level is 100～500VA.It is used for power supply for household electronic products,but the inverter power supply for special vehicles is 1500 horsepower.The engine is energized,and the general energy is rectified and output to the inverter for various loads.The input voltage of the special vehicle inverter power supply is 900±10%,the output is 220V/50Hz,and the power is 5000VA.Due to its working working environment,the input voltage level safety and reliability are far different from ordinary vehicle inverter power supply.A practical problem is to launch a special vehicle inverter power system is imminent.For the special vehicle inverter power supply,the input voltage ripple is large in the actual operation(bus voltage±10%),and the voltage level is high,resulting in high voltage resistance level of the switch tube,large loss of the switch tube,and electrical isolation between the output and the load.Design requirements,using input parallel bus flat wave capacitor group and full bridge SPWM(Sine Pulse width modulation)output parallel isolation transformer,SPWM full bridge parallel auxiliary resonant soft switching circuit ARCPSSCs(Auxiliary Resonant Commutated Soft Switch Circuits)single-stage inverter The power supply structure realizes high stability,low loss,and high efficiency energy conversion.This paper first introduces the working principle and mathematical model analysis of full-bridge SPWM,and analyzes the modulation strategy of the auxiliary resonant circuit.The principle and process of power device parameter design in the main loop are expounded.The influence of different parameter differences on the circuit is analyzed by Simulink simulation.It is verified that the inverter can adopt soft switching action when inputting high voltage,which can effectively reduce the switching tube loss.In order to ensure the dynamic and steady-state performance of the system,a single closed-loop control model based on fuzzy adaptive PID control is established.The output voltage feedback adjustment method is adopted,and the high-efficiency control is realized by DSP28335.The Labview human-computer interaction interface is designed to monitor the inverse in real time.The system is operated and the data is observed through the on-site LCD 12864.In order to ensure the safe operation of the system,overvoltage,undervoltage,overcurrent,short circuit and overheat protection measures are designed to protect the safe operation of the system.Finally,a 5000VA/5kHz prototype was built using IGBT(Insulated Gate Bipolar Transistor).