Datasheet LTC1042 (Analog Devices) - 7

LTC1042
U U W U APPLICATIO S I FOR ATIO Wind Powered Battery Charger
2) If the generator voltage output is between 13.8V and 15.1V, the 12V lead acid battery is being charged at A simple wind powered battery charger can be about a 1A/hour rate (limited by the power FET). constructed using the new LTC1042, a 12V DC permanent magnet motor, and low cost power FET transistor. 3) If generator voltage exceeds 15.1V (a condition caused by excessive wind speed or 12V battery being fully The DC motor is used as a generator with the voltage charged) then a fixed load is connected thus limiting output being proportional to its RPM. The LTC1042 the generator RPM to prevent damage. monitors the voltage output and provides the following control functions: This charger can be used as a remote source of power where wind energy is plentiful, such as on sailboats or 1) If generator voltage output is below 13.8V, the control remote radio repeater sites. Unlike solar powered panels, circuit is active and the NiCad battery is charging this system will function in bad weather and at night. through the LM334 current source. The lead acid battery is not being charged. 12V WIND GENERATOR 107k 1N4001 10k 0.1µF + 12V LM334 LEAD ACID WITHIN 36Ω 0.1µF 68Ω WINDOW 5W 13.8V TO 15.1V MTP8N05 1 8 215k 10M 100k 2 7 4.5V NiCAD 3 LTC1042 6 MTP8N05 BATTERY 4 5 + OVER VOLTAGE 0.1µF (>15.1V) 10k LT1004-1.2 LTC1042 • A105 1042fa 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. 7