Research On Energy Transfer Efficiency Of IGBT Under Random PWM Driv

Insulated-gate bipolar transistor(IGBT)is a high-power main electronic device widely used in the field of power electronic equipment.Compared with traditional electronic devices,IGBT devices have the advantages of fast switching speed,low onstate voltage drop,and low driving power.As an important part of inverters,IGBTs are widely used in motor control,aerospace and other industrial fields,as well as wind power,photovoltaic power generation and other clean energy fields.However,the safety of IGBT modules in the working process has gradually become a research highlights.During the high switching frequency of the IGBT,the switching losses will rapidly generate a large amount of heat.It caused the temperature of the IGBT module to rise,which in turn will affect the working performance of the IGBT.In severe cases,the IGBT will fail directly.Therefore,in the study of IGBT safety issues,the analysis of heat production and the methods of heat dissipation become particularly important.Aiming at the heat production of IGBT module,firstly this paper analyzes the principle of heat production of IGBT module.Analyzing the power losses of IGBT module,and gives the mathematical model of conduction losses and transient losses of IGBT and reverse freewheeling diode respectively.Secondly combined with the harmonic analysis theory,this paper analyzes the influence of harmonics on the power losses of the IGBT module during the modulation process based on the pulse width modulation(PWM)control technology.Based on the analysis of heat production of IGBT modules,three random PWM techniques are adopted,namely random carrier frequency PWM,random duty cycle PWM and random dead time PWM.Combining the three random PWM control methods with the heat generation theory of IGBT module,the power losses of IGBT module is analyzed theoretically and verified experimentally.In addition,for the improvement of phase current harmonic of inverter,three random PWM control technologies are used to build a simulation model and experimental verification based on the Vector Control(VC)principle and the modern permanent magnet synchronous motor(PMSM)control system.The theoretical analysis of the power spectrum estimation of the phase current is carried out,then the influence on the harmonics of the phase current is observed.When verifying the results,firstly this paper builds the PWM simulation model on Matlab/Simulink,and obtains simulation models of three random PWM technology through improve the PWM simulation model.Secondly,it uses power spectrum methods to analyze the simulation results.By comparison,it can be seen that the three random PWM technologies have a suppressing effect on harmonics of the inverter phase current.It can be concluded that the three random PWM technologies can reduce the harmonic losses in inverter and improve the performance of the PMSM,In the experimental verification,TMS320F28335 is used to build a PMSM experimental platform to verify the effects of three random PWM control techniques on phase current harmonics and IGBT module power losses.Firstly,in the influence of phase current harmonics,by measuring the phase current experimental data of the PWM and three random PWM scheme,and separate analyzing the data by the power spectral density.By comparing the power spectral density curve of phase current,the three random PWM control methods can effectively suppress the harmonic component of phase current compared with the PWM control method.Secondly in the power losses experiment of the IGBT module,measuring the temperature signal of the IGBT module under the same running time of the PMSM system.And analyzing the temperature data in the state of thermal equilibrium of the IGBT module.Compared with the PWM,three random PWM techniques can be reduced to the power losses of thee IGBT module varying degrees without affecting the operating performance of the PMSM system.Finally,it improving the energy transfer efficiency of the IGBT module.