Random noise vibration driver IC for walking balance enhancement

• Main Authors: Hu, Chih Chia, 胡志佳
• Other Authors: Hsu, Yung-Jane
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/57686803608805845869

碩士 === 國立清華大學 === 電子工程研究所 === 102 === Falls are deadly issue for elders in this aging society. The prime cause of fall-related accidents is the degrading of proprioceptors, which severes with the age increasing or by physical diseases, so the elders need larger outside signal to excite their proprioceptors. The technique of applying stochastic resonance on cutaneous sensation to improve sensory function has been well developed for many years. The particular phenomenon of stochastic resonance can enhance the detection of weak signals, when applying the random vibration on the sole of foot. However, the balance- enhanceing devices from the papers are not suitable for carry because of their huge size or more power comsumption. Therefore, we design a portable self balance- enhanceing device with low power consumption and it has widely adjustble range of the vibration intensity. In this thesis, we verified that the piezoelectric actuator is a low power consumption material by our experiment. The model of balance- enhanceing device which is composed of function generator, power supply, and differential amplifier is described, and we also verified that this system can improve the performance of the human balance control system. Finally, we designed a 20V boost converter and a low frequency random noise driver for piezoelectric actuator in a single chip, and the measurement result of the circuit are identical with expectation. The chip was fabricated in TSMC 0.25μm 1P3M CMOS technology, and the total area of the integrated circuit is 1.402mm×1.900mm.