Sử dụng pin mặt trời nhỏ và siêu tụ điện trong bộ cảm biến không dây

im.<br /> <br /> <br /> <br /> <br /> sa DUNG PIN MATTRCfl NHO ll -j I if i JL.<br /> <br /> <br /> <br /> <br /> TRONG BO CAM BIEN KHONGDAY<br /> USING A SMALL SOLAR CELL A N D A SUPERCAPACITOR IN A WIRELESS ^ ^ ^ ^ ^ ^ H ^ ^ B<br /> <br /> <br /> Wireless sensor networks (WSNs) are becoming more common. They solve problems in many applications, some of which<br /> can harvest solar energy to use as a limitless, battery-free energy source. In these applications a supercapacitor provides<br /> both temporary energy storage and power delivery.<br /> Harvested solar energy can power motion sensors to turn off lights If nobody is detected in a room, to dim lights depend-<br /> ing on the light level in a room, to sense and report temperature for air conditioning or heating, and to monitor the secu-<br /> rity of remote locations while avoiding the need to replace and dispose of batteries.<br /> However, small solar cells are very low power, delivering milliwatts of energy. So the problem becomes how to power wire-<br /> less transmission, which requires higher amounts of power, using a low-power source. So the key here is supercapacitor<br /> <br /> g e thong mang cam bien viTa dti truf nang liTofng tam thdi, xa trong khi co the tranh dtftfc nhu<br /> <br /> <br /> <br /> thong nay giai quyet dUflc co the dieu khien cam bien truyen Tuy nhien, pin mat trdi loai nho cd<br /> cac van de trong nhieu i?ng dung dong de tat cac bong den neu cdng suat rat thap chi cd vai<br /> khac nhau, mot sd co the stif dung khong co ai d trong phong, lam miliwatt. Do dd, van de la lam sao<br /> nang luang mat trdi nhir mot nguon giam cong suat den tuy thuoc vao de cung cap nang lUdng cho viec<br /> l'[*'l'y:|llll.r.lili lliiTiTiTil iTiliriKi fil iJi i'l-2 f rflrrarltT<br /> Trong ufng dung nay, mang cam va thdng bao nhiet do cho may dieu hdi lirofng cdng suat cao trong khi suf<br /> bien khdng day duoc ket hoip vdi hda hoac cho cac Id nhiet, va giam dung ngudn cdng suat thap. Chia<br /> sieu tu dien de tao ra hai chufc nang sat tinh hinh an ninh d nhOng vj trf khda d day chfnh la cac sieu tu dien.<br /> <br /> Automation T<br /> Energy harvesting la 7/8 W trong 3s hoac tuong dUOng<br /> Supercapacitor with high C (energy) and low ESR<br /> source must b e able to (power) buffers the source from the load. Source sees<br /> average power. Load sees low Impedance source.<br /> vdi la 2.6 J. Ne'u tu dien dddc dat d<br /> deliver a v e r a g e load<br /> current = 4 2 0 |A dau vao cua thie't bj ehinh lUu eho<br /> GS203 + phep giai dien ap rdng hdn vdi gia trj<br /> DC:DC amn<br /> 8I converter can mr 30, Load. Idn nha't la 5V va gia trj nhd nha't la<br /> High power 2.5V, edng sua't dau vao Idn nha't se<br /> W^ ^=^ fig be sized for i:ji:z!> CAP-/<br /> average load peaks roi ~7 W/85% hoac tuong dUdng -8.3<br /> power W, va nang lUdng thu dddc la ~3 J. De<br /> dap Ong nhOng yeu eau nay can phai<br /> e.g., 60% efficient, cd 0.4 F vdi ESR