| Summary: | 碩士 === 輔仁大學 === 電子工程學系 === 96 === This paper proposes an improved design of a wireless keyboard system by analyzing the hardware characteristics of each of its modules with the goal of reducing the power consumption of the wireless keyboard. From our measurement analysis we set the wireless keyboard at the fixed working voltage of 2.2V. The system can extend the working hours by 1.94 times and the standby hours by 5.67 times. Besides, the common wireless keyboard usually is being used in indoor rooms. There, solar cells are easily interfered with by people covering the light source. This may cause frequent interruption of the solar cells for short periods so that the rechargeable battery charges and discharges power. This draws on the memory effect of the rechargeable battery and reduces its life time. Therefore a non-memory device, rechargeable more than 100,000 times, and a self-sufficient 15 Farad 4.6V large capacitor are used as our energy storage unit which supplies the power for the whole wireless keyboard. We also analyze the power exhaustion probability using a queuing model. Our experiment has shown that in 99% of cases a 15 Farad 4.6V large capacitor combined with a solar cell of 9.7cm × 5.8 cm supplies sufficient power. A self-sufficient power supply system of course does not need any additional power supply.
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