Patent ID: 7541916
Filing Date: 2009-06-02
Classification: B60C

Abstract:
1. A RFID (Radio Frequency Identification) tag power supply using a static magnetic field of a RFID TPMS (tire pressure monitoring system), which has a sensor for periodically measuring a tire pressure and generating tire pressure data and a transmitter for storing the measured tire pressure data and loading and transmitting the tire pressure data on a radio frequency, the power supply comprising: a static magnetic field generator installed at a portion of a car adjacent to a tire, and generating a static magnetic field, wherein the static magnetic field generator comprises an electromagnet powered by a car battery; and an EMF (ElectroMotive Force) coil installed at the tire, and generating an induced electromotive force by the generated static magnetic field and a relative motion resulting from rotation of the tire, and providing the generated electromotive force to the transmitter and the sensor.