Lowered Fin Heat Sinks for Automotive Electronic Applications 880449
The Electronic Automatic Temperature Control (EATC) system provides the customer with a continuously variable blower motor operation. The high current is controlled by a power transistor. This device, which is capable of dissipating over 100 watts, requires a heat sink capable of thermally conducting the heat source to atmosphere (figure 1).
Louvered fin heat exchangers have already been optimized for use in radiators and condensors. The same technology, using vacuum brazing techniques, was applied to develop a heat sink for electrical components. To do so, power transistor operating and cycling temperatures, A/C system airflow and airflow velocity had to be considered. An operating system was designed where all of the design criteria were met.