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Uses of NICADs
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There are other uses for NICADs besides in portable entertainment equipment. Most orbiting satellites are in darkness half the time, and in sunlight half the time. Solar panels can be used while the satellite is in sunlight, but during the times that the earth eclipses the sun, batteries are needed to power the electronic equipment on board the satellite. The solar panels can charge a set of NICADs, in addition to powering the satellite, for half of each orbit. The NICADs can provide the power during the dark half of each orbit. Nickel-cadmium batteries are available in packs of cells. These packs can be plugged into the equipment, and might even form part of the case for a device. An example of this is the battery pack for a handheld ham radio tranceiver. Two of these packs can be bought, and they can be used alternately, with one installed in the handie-talkie (HT) while the other is being charged.
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There are some things you need to know about NICAD cells and batteries, in order to get the most out of them. One rule, already mentioned, is that you should never discharge them all the way until they die. This can cause the polarity of a cell, or of one or more cells in a battery, to reverse. Once this happens, the cell or battery is ruined. Another phenomenon, peculiar to this type of cell and battery, is called memory. If a NICAD is used over and over, and is discharged to exactly the same extent every time (say, two-thirds of the way), it might start to go to sleep at that point in its discharge cycle. This is uncommon; lab scientists have trouble forcing it to occur so they can study it. But when it does happen, it can give the illusion that the cell or battery has lost some of its storage capacity. Memory problems can be solved. Use the cell or battery almost all the way up, and then fully charge it. Repeat the process, and the memory will be erased. NICADS do best using wall chargers that take several hours to fully replenish the cells or batteries. There are high-rate or quick chargers available, but these can sometimes force too much current through a NICAD. It s best if the charger is made especially for the cell or battery type being charged. An electronics dealer, such as the manager at a Radio Shack store, should be able to tell you which chargers are best for which cells and batteries.
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The photovoltaic cell is completely different from any of the electrochemical cells. It s also known as a solar cell. This device converts visible light, infrared, and/or ultraviolet directly into electric current.
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Several, or many, photovoltaic cells can be combined in series-parallel to make a solar panel. An example is shown in Fig. 7-6. Although this shows a 3 3 series-parallel array, the matrix does not have to be symmetrical. And it s often very large. It might consist of, say, 50 parallel sets of 20 series-connected cells. The series scheme boosts the voltage to the desired level, and the parallel scheme increases the current-delivering ability of the panel. It s not unusual to see hundreds of solar cells combined in this way to make a large panel.
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The construction of a photovoltaic cell is shown in Fig. 7-7. The device is a flat semiconductor P-N junction, and the assembly is made transparent so that light can fall directly on the P-type silicon. The metal ribbing, forming the positive electrode, is interconnected by means of tiny wires. The negative electrode is a metal backing, placed in contact with the N-type silicon. Most solar cells provide about 0.5 V. If there is very low current demand, dim light will result in the full output voltage from a solar cell. As the current demand increases, brighter light is needed to produce the full output voltage. There is a maximum limit to the current that can be provided from a solar cell, no matter how bright the light. This limit is increased by connecting solar cells in parallel.
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