Design and Fabrication of 4-beam Silicon-Micro Piezoresistive Accelerometer for TPMS Application

TPMS용 4빔 실리콘 미세 압저항형 가속도센서의 설계 및 제작

  • 박기웅 (울산대학교 전기공학부) ;
  • 김현철 (울산대학교 전기공학부)
  • Received : 2011.11.02
  • Accepted : 2012.02.15
  • Published : 2012.02.25

Abstract

This paper presents the accelerometer which is a key component of TPMS(Tire Pressure Monitoring System). Generally a piezoresistive accelerometer has characteristics of lower cost, better linearity and better immunity about the environmnet noise than a capacitive one. Three types of piezoresistive accelerometers are degined and simulated using ANSYS program. The best one is a piezoresistive sensor which is supported by four beams located at the center of the edge of the mass after comparing the characteristics of resonant frequency of the three types. Considering the sensor size and a simulated maximum stress and maximum displacement, the length of beams is set as $200{\mu}m$. The size of a piezoresistive accelerometer is $3.0mm{\times}3.0mm{\times}0.4mm$. The sensor output is characterized by measuring the output characteristic depending on angle. As a result the offset voltage of the accelerometer is 43.2 mV and its sensitivity is $42.5{\mu}V/V/g$. The temperature bias drift is measured. The shock durability of the sensor is 1500g and the measuring range is 0 ~ 60 g.

Acknowledgement

Supported by : 현대중공업

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