The Research On High Power IGBT Intelligent Control Strategy

With the rapid development of high-power IGBT production technology, it is more andmore widely used in new industries, new energy, smart grid, rail transport and defenseindustry applications, and high-power IGBT driver acting as a link between control unit andraw power, its requirements are also increasing. Because of its importance, it is necessary tostudy the IGBT driver as an independent "subsystems". The IGBT intelligent driverconsider all kinds of work situations, then use different driver strategy, and make the IGBTwork in the best condition, such as reducing the "Miller" effect of the duration andconducting loss; developing a new type of inhibition IGBT off spikes. This intelligentdriver which uses different measures according to the different needs of the IGBT is thenew development direction.The thesis analyzes the working principle and characteristics of the IGBT. The IGBTswitching characteristics, as well as the feasibility of various control strategies has studied.IGBT driver control strategies based on the the IGBT characteristics analysis have beendetailed analysised: the variable gate resistance to improve driving characteristics; a varietyof short-circuit protection measures as well as its advantages and disadvantages; new softturn-off the IGBT and its advantages; the active clamp to suppress IGBT off spikes.According to the different types of IGBT, different control stategy and the driver boardwere developed. The drive control programs based on Lattice’s CPLD were designed andthe driver circuits were developed.The experimental platform has been set up and confirmatory experiments were madefor two different types of IGBTs and driver boards. The experimental results show that thevariable resistor decreases the duration of the effect of "Miller", the switch delay time, andswitching losses; with the use of a variety of short-circuit protection can distinguishshort-circuit I and II; soft turn-off make current drop slowly and make the turn-off spikesmall; active clamp technique make the turn-off spike be clamped at the expected value.