{Solar Power Options}

Solar Power Backup Battery

Solar Powered mobile telephone battery charger -Common electronics and products

Pocket telephones have become a means of living. It is inconceivable to exist off from the mobiles even for some minutes. Advanced mobiles arrive with many characteristics like multi media facilities, 3G connectivity, visual options and many other features. But, there is one aspect of these products which has experienced very limited and stationary development. It is the lifetime of the battery and run time of the battery. Accepted, the progressive phone batteries are longer lived and give a large speak time back up but it is inevitable to get the mobiles working on low charge, many instances of the week. There are adaptors and universal chargers that can comfortably fill this power deficit but they constantly need an electric power output. One of the latest and most fantastic innovations in mobile electronics domain is the solar powered mobile battery charger. How cool is charging the mobiles without connecting it to any electrically powered source? Apart from this usage, these devices also behave as a stored power back up source that can be applied at whatever time of the day, to charge phone cells.

These devices act akin to the conventional chargers but the only divergence is that the power need not come from an electrical port; it can also come out of solar panels that are ideally set in the gadget. These panels gather light and convert it to current which in turn is pointed to the built-in battery piece. This can be linked to the mobile phone batteries that need to be charged. These devices can switch any light source into battery charging current but act best in sunlight. They are also outfitted to be charged by the established ways and can be expended as back up chargers for the mobiles. They also come with adaptors of several phone models and makes. This extreme adaptability and good utility makes this a should have for every body. They also can be employed to charge music players, electronic cameras, etc., If one is travelling, this one device fulfills all the power requirements and necessary backups for nearly all electronics and electrical devices. These products might not be obtainable at all places but can unquestionably be bought online. The cost of the product is not too high and when compared to the benefits, it is decidedly well worth its price. It feels good to live in such times when impressive and modern electronics and gizmos are moving the market place at such a great frequency and this solar powered charger is as well one such device.

3x8 Decoder Implementation problem?

A Power backup system for a home (Load) can provide energy from U, the utility company, S solar panels and B batteries. S, when available, is the preferred source. B is to be used only as the last resource and never when the battery voltage is low. Three sensors, U, S and B will indicate 1 when Utility is available, Solar is available and Battery voltage is OK. Using 3x8 decoders and external gates, design a circuit to implement functions I1, I2 and I3. I1, I2 and I3 will control breakers that will connect the selected power source to the Load. Sketch the resulting circuit including interrupters and Load.

I am assuming that I1 activates the connection between the solar panel and load, I2 between utility and load, and I3 between battery and load. If this is the case, then
I1 = S
I2 = S'U
I3 = S'U'B

These three logical functions can be implemented with two inverters to generate the S' and U' signals and two AND gates. From a logic standpoint, this is a lot cheaper than implementing these functions with 3-to-8 decoders. However, this can also be done with two decoders. The signal I1 needs no decoder, since it is simply signal S. By setting the high-order signal to zero, one 3-to-8 decoder can be effectively converted to a 2-to-4 decoder to generate I2. Assuming that S is connected to the middle-order bit, then I2 would be derived from the output corresponding to the number 1. Similarly, by connecting S to the high-order input of a second converter, U to the middle input, and B to the low-order input, the signal I3 can be derived from the output for number 1.

Or, assuming one 3-to-8 decoder with S connected to its high-order input, U to the middle input, and B to the low-order input, I1 can be derived directly from S or, if it is necessary to go through the 3-to-8 decoder, from ORing outputs 4, 5, 6, and 7. Similarly, I2 can be gotten by ORing outputs 2 and 3 and I3 taken directly from output 1. Output 0 can presumably be set to activate an alarm indicating that the load has no power - assuming that enough power is available in the absence of all three power sources to operate the logic and the alarm.

NASA ISS On-Orbit Status 8 August 2010 All ISS systems continue to function nominally, except those noted previously or below.

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