Self Heating and IR Emission Effects Simulation of Radiative Heater on Power MOS AC Switch

High power IR heaters are very common but some have high switch on current due to the high difference of the electric resistance at ambient temperature and at steady state temperature. In this paper we develop a thermal model of these IR heaters considering the radiated power which is proportional to the fourth power of the temperature, according to the Stefan Boltzmann law. We propose a new circuit based on a series of two power MOS and simulate the switching, showing the temperature and heat flux inside the heater and MOSFET.