Tire pressure sensor with power generator

摘要

A tire pressure sensor with power generator (22) includes a spool (26) having a coil (30) wound therearound. Within the spool (26) is a pole piece (28). The tire pressure sensor (22) is installed in a wheel (12) that rotates with respect to a brake clamp (18). The brake clamp (18) includes a magnetic strip (80) that the sensor (22) moves past as the wheel (12) rotates. As the tire pressure sensor (22) moves past the brake clamp (18), the magnetic strip (80) causes the coil (30) to output an AC voltage signal. A rectifier circuit (42) connected to the coil (30) converts the AC voltage to DC voltage. The DC voltage is stored in a storage capacitor (44) to be used as needed by an air pressure sensing element (52) connected thereto. <IMAGE>