NDLI: An improved design of a wireless keyboard powered by solar cells and a large capacitor

Content Provider	IEEE Xplore Digital Library
Author	Ying-Wen Bai Ming-Yuan Yang
Copyright Year	1975
Abstract	This paper mainly 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. In our experiment we have set the wireless keyboard at a fixed active voltage of 2.2 V with the lowest possible current consumption. The system can extend the working hours by 1.94 times and the standby hours by 5.67 times. Instead of the memory effect of the rechargeable battery our design uses a non-memory self-sufficient component of a 15 Farad 4.6 V large capacitor with a smaller size than that of the rechargeable battery. This capacitor can be recharged up to more than 100,000 times as our energy storage unit which supplies the power for the whole wireless keyboard, and in which the power exhaustion probability is less than 1% as it uses solar cells of 9.7 cmtimes5.8 cm¹.
Sponsorship	IEEE Consumer Electronics Society
File Size	432873
File Format	PDF
ISSN	00983063
Volume Number	54
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Keyboards Photovoltaic cells Capacitors Energy consumption Batteries Power supplies Microcontrollers Radio frequency Voltage control Control systems Wireless Keyboard, Solar Cells, Power Consumption, Queuing Model, Large Capacitor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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