| With the rapid development of society and power electronics technology,low-voltage and high-current power supply have a very wide application prospect in the ship,aerospace and industrial fields.PWM rectifier module as the key component of low-voltage and high-current power supply,its high-speed switch MOSFET device working becomes the main interference sources of electromagnetic interference with module.Exceeding the standard of electromagnetic interference will not only short the life of rectifier module itself or the surrounding electronic equipment,but also will lead to the performance of it decline and affect the health of people who have been in touch with the equipment for a long time.Therefore,it is very necessary to study the conducted interference of PWM rectifier module in low-voltage and high-current power supply.At present,domestic and foreign researches of conducted interference of PWM rectifier module considering parasitic parameters of MOSFET are very rare.At the same time,the existing extraction methods of parasitic parameters not only have relatively high requirements on computer hardware and processing speed,but also have limitations such as not imposing truncation boundary conditions when calculating open domain problems.The existing methods of conducted interference suppression have the disadvantages of complex circuit structure and the increased volume and weight of PWM rectifying module.This paper takes the PWM rectifier module of low-voltage and high-current power generation system as the research object,the conducted interference simulation model of PWM rectifier module is established,and the common-mode interference suppression is completed based on the simulation model.First of all,the basic composition of the low-voltage and high-current power system are studied,it is mainly composed of a 12-pole and 54-slot synchronous generator and two confluence plates.The surface of the confluence plate is equipped with heat sinks,on which rectifier modules are installed in parallel.On the basis of the system structure,the main interference source and propagation path of the conducted interference are studied and analyzed.Secondly,in this paper,the matrix extraction method is proposed to establish an accurate conducted interference model and a 3D crimped Si C MOSFET model is established via Ansoft Q3 D simulation software.The matrix of the parasitic parameters between poles of the MOSFET is simulated to extract the accurate parasitic parameters.On the basis of parasitic parameters extracted,the simulation model of conduction interference of high-precision PWM rectifier module is established.In addition,high-precision PWM rectifier module which is established in this paper,with the common-mode interference of AC side and DC side,is compared to adding parasitic parameters of passive components and ideal condition.Thirdly,the methods used to suppress common-mode interference are two-stage EMI filter,spread spectrum technology and SVPWM jump-backward control strategy based on three-phase four-leg structure,which are based on the conducted interference simulation model of high-precision PWM rectifier module.In addition,the performance of these methods is compared.Finally,the experimental platform of 5V/1000 A low-voltage and high-current power system were built,and the conducted interference test was carried out according to the simulation results.It is proved that the main interference sources of common-mode interference is the DC side of PWM rectifier module,and the accuracy of parasitic parameters of the model is based on matrix extraction method,which provides a more simple and effective reference method for the prediction of conduction interference in power converter system.By comparing the simulation results and experimental results show that the SVPWM jump-backward control strategy based on the three-phase four-leg structure can guarantee the output of the bridge leg balance,and achieve the ideal state of common-mode interference. |
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