发明名称 |
TIRE PRESSURE MONITORING USING HALF DUPLEX TRANSPONDER FREQUENCY SHIFT |
摘要 |
A tire pressure sensor has an RFID (radio frequency identification) device having a parallel resonant circuit including an inductor and a first capacitor for generating a first radio frequency (RF) signal for transmission to a reader circuit, and a second capacitor coupled across the parallel resonant circuit by a first switch in a first position and generating a second RF signal for transmission to the reader circuit. A capacitive pressure sensor is coupled across the parallel resonant circuit by the first switch in a second position for generating a third frequency RF signal for transmission to the reader, wherein a difference in frequency between the first and third RF signals is indicative of a pressure of a tire. |
申请公布号 |
US2015283867(A1) |
申请公布日期 |
2015.10.08 |
申请号 |
US201514679724 |
申请日期 |
2015.04.06 |
申请人 |
Texas Instruments Deutschland GmbH |
发明人 |
Lichtengger Alfons |
分类号 |
B60C23/04 |
主分类号 |
B60C23/04 |
代理机构 |
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代理人 |
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主权项 |
1. A tire pressure sensor comprising:
an RFID (radiofrequency identification) device having a parallel resonant circuit comprising an inductor and a first capacitor for generating a first radiofrequency (RF) signal for transmission to a reader circuit, and a second capacitor coupled across the parallel resonant circuit by a first switch in a first position for generating a second RF signal for transmission to the reader circuit; a capacitive pressure sensor being coupled across the parallel resonant circuit by the first switch in a second position for generating a third frequency RF signal for transmission to the reader, wherein a difference in frequency between the first and third RF signals is indicative of a pressure of a tire. |
地址 |
Freising DE |