Universal Battery Charger

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I want to submit a scheme of universal charger. The scheme in fact is not difficult but quite reliable. With this device you can charge any battery in the range of 1.5 - 15V and 0.1 - 6A.

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Automatic shut-off device on the network by the end of the charge is only 12V battery. For other batteries used only visual inspection of the instrument. The power of the device used for parallel connection of transistors uvelechenie their load capacity. Cooler controller applied due to reasons of reducing the size and versatility of the device. If we assume the device will often be applied to charge small currents, why nothing rotating fan.? The cooler used on earlier models Computers processors, which secured all three transistors. When tested at a maximum current of cooler radiator is not heated over 50 degrees.

Automatic disconnection device from the network:

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made on the comparator LM311 (analogue of our K554SA3), which is controlled by the two dividers, one configured on the end of charging the battery, the other at the beginning of the corresponding Trimmer. Thus the device can be used to store the car battery and other 12-tivoltovyh batteries. Final charging voltage is selected 16.2v, 11.5v start charging, established empirically through many experiments. The idea of this machine was peeped at Well. "Radio amateur".

Job Controller cooler fan:

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It is based on a transistor property (required Germany) to change its properties under the influence of temperature. Fan starting temperature is set trimmer. Transistor (MP26B desirable) is attached to the radiator through the thermo-power transistors.

D242A diodes are mounted on a common heat sink of 100cm2 is based on each diode.

General diagram of the device:

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Going on two printed circuit boards, on which are placed the cooler parts of the fan controller and automatic charge termination, the remaining parts are mounted by surface mounting. Switch S1 puts the device in automatic or manual modes.
 
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