COOLING FAN REQUIRES NO ADDITIONAL CURRENT
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-16
This invention describes a method of powering a cooling fan for electronic equipment that requires no additional current compared to when the fan is not needed. Current drain is kept constant by allow- ing the decrease in transmitter current drain during thermal shutback to be equally diverted to the fan, regardless of power output or temperature. This method provides a continuously variable distribu- tion of current between the transmitter and the cool- ing fan and results in constant current drain on the power system. Minimum variation of transmit power over time is an added benefit compared to other methods of intermittent cooling.