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LTC1042 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1042 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page 7 LTC1042 1042fa APPLICATIO S I FOR ATIO Wind Powered Battery Charger A simple wind powered battery charger can be constructed using the new LTC1042, a 12V DC permanent magnet motor, and low cost power FET transistor. The DC motor is used as a generator with the voltage output being proportional to its RPM. The LTC1042 monitors the voltage output and provides the following control functions: 1) If generator voltage output is below 13.8V, the control circuit is active and the NiCad battery is charging through the LM334 current source. The lead acid battery is not being charged. 2) If the generator voltage output is between 13.8V and 15.1V, the 12V lead acid battery is being charged at about a 1A/hour rate (limited by the power FET). 3) If generator voltage exceeds 15.1V (a condition caused by excessive wind speed or 12V battery being fully charged) then a fixed load is connected thus limiting the generator RPM to prevent damage. This charger can be used as a remote source of power where wind energy is plentiful, such as on sailboats or remote radio repeater sites. Unlike solar powered panels, this system will function in bad weather and at night. LTC1042 • A105 8 7 6 5 1 2 3 4 LTC1042 12V GENERATOR WIND LM334 4.5V NiCAD BATTERY 215k 10k 0.1µF MTP8N05 36Ω 5W 1N4001 MTP8N05 12V LEAD ACID 0.1µF 0.1µF 107k 10M WITHIN WINDOW 13.8V TO 15.1V OVER VOLTAGE (>15.1V) 100k 10k 68Ω LT1004-1.2 + + Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. |
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