Circuit for controlling voltage in a tire-based unit of tire parameter sensing system and associated method

摘要

A circuit ( 14 ) for use in a tire ( 16 ) of a vehicle ( 10 ) having a tire parameter sensing system ( 12 ) includes a battery ( 60 ) for supplying electrical energy. The battery ( 60 ) has an equivalent series resistance ( 64 ) that varies inversely with temperature. The circuit ( 14 ) further includes a current control device ( 90 ) that is responsive to at least one of an output voltage of the battery and temperature for adjusting a current draw from the battery ( 60 ) to insure a predetermined minimum output voltage from the battery ( 60 ).