| 초록 |
To attain power conversion from human warmth, some points for the design of the device would be considered, for example, the place to wear, thermoelectric module dimension, the thermal resistance, etc. In this presentation, human wrist was chosen for thermoelectric power conversion for wristband-type wearable applications. Considering the dimension and thermal resistance of human wrist, the area and thermal resistance matched design of thermoelectric module was determined. In the thermoelectric module, the dimension of thermoelectric legs and the number of thermoelectric leg-pairs dependent output power performances of the thermoelectric generator on the human arm condition was calculated using 1-dimensional approximated heat flow equations with the temperature dependent material coefficients of the constituent materials and the dimension of the substrate. With the optimum thermoelectric generator design, thermoelectric generator modules were fabricated by using newly developed fabrication processes, which is mass production possible. The electrical properties and the output power characteristics of the fabricated thermoelectric modules were characterized by using a home-made test set-up. The output voltage of the designed thermoelectric generator was a few hundreds of mV and its output power was a few mW under the conditions at the virtual human arm condition. The measured output voltage and power of the fabricated thermoelectric generator were slightly lower than those of the designed thermoelectric generator due to several reasons. For applications, wristband-type wireless presenter was made and demonstrated by using the above thermoelectric generator, heat sink, power management integrated circuit, etc. |
