In this paper, to study the heat transfer characteristics of conduction, convection, radiation for heatsink, we considered the heat transfer characteristics of power electronics(IGBT). To confirm the power loss of power electronics, we analyzed relationship between the profile current ,varies according to the time and the average current of the profile. By this analysis, we proposed the heatsink model of optimization for temperature rise. Also, we varified that the temperature rise of heatsink is same in the profile current ,varies according to the time as well as in the average current of the profile. Furthermore, we resulted that the time response and heat resistor for heat sink is stable according to the heatsink's volume.
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