Title :
On line thermal model and thermal management strategy of a three phase voltage source inverter
Author :
Blasko, Vladimir ; Lukaszewski, Rich ; Sladky, Ray
Author_Institution :
Dept. of Stand. Drives Dev., Rockwell Autom., Mequon, WI, USA
Abstract :
A third order dynamical thermal model suitable for modeling diodes and IGBTs is proposed. The method for deriving model parameters from manufacturers data sheets is derived and verified. Models of the power circuit devices, IGBTs and diodes, together with a heat sink model are combined into a dynamical thermal model of 3-phase inverter bridge. The model, together with thermal management strategy is implemented in a microprocessor. The instantaneous values of junction temperatures of IGBTs and free wheeling diodes (FWDs) are estimated on-line with a one step ahead prediction algorithm. If the temperature on any of the power devices reaches a critical value, the PWM frequency is reduced or the PWM method changed in order to reduce losses. If switching losses are still too high and minimum allowable switching frequency is reached; the thermal model starts to reduce inverter current in order to keep the junction temperature of the hottest device of the power circuit below a critical level. The dynamical model with thermal management strategy becomes most useful at low frequency, i.e. stall speed like operation of the drive with high instantaneous loading on particular devices in the power circuit
Keywords :
PWM invertors; bridge circuits; insulated gate bipolar transistors; losses; power semiconductor diodes; power semiconductor switches; switching circuits; thermal analysis; thermal management (packaging); 3-phase inverter bridge; IGBT; PWM frequency; PWM method; diodes modeling; dynamical model; dynamical thermal model; free wheeling diodes; heat sink model; high instantaneous loading; inverter current reduction; junction temperatures; losses reduction; microprocessor; on line thermal model; one step ahead prediction algorithm; power circuit devices; stall speed like operation; switching losses; thermal equivalent circuit; thermal management strategy; thermal model; third order dynamical thermal model; three phase voltage source inverter; Circuits; Cogeneration; Diodes; Frequency; Insulated gate bipolar transistors; Pulse width modulation; Pulse width modulation inverters; Temperature; Thermal management; Virtual manufacturing;
Conference_Titel :
Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5589-X
DOI :
10.1109/IAS.1999.801687