D:\My documents\Warehouse\Novri_yadi\Schematic Files\New Schematics\AUTOmotive\Automatic ACCU Charger.doc

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Automatic ACCU Charger

Original Article by : http://www.electronics-lab.com/projects/power/004/index.html

With this circuit you can develop a cheap charger for batteries .We speak for a circuit of automatic interruption when the Voltage of battery reaches the 13,8V and automatic reintroduction when the Voltage of battery is smaller than 12,6V. The Op-Amp 4 maintains in collaboration with the passage zener D7 and the divider of tendency R10, R11 and R1 a constant Voltage of report 6,9V in exit [A]4. If is not no battery connected then the current of entry of A2 causes Voltage in the R4, thus, in order that the exit of [A]2 takes price �0�. This means simultaneously that is not activated the relay and that expense of charger. The T1 is not even destroyed in the case of opposite polarisation of accumulator.

If now is connected a accumulator for, are led the A1 and A2 in the price �the 1� and relay close. When the Voltage of battery amount in price 13,8V the point between R2 and R3 has 6,9V, that is to say the Voltage of entry of A1 is equal with the Voltage of report of not inverting entry.

The A1 in the �0� and interrupts the process . Finished henceforth you can place him in himself the box of your charger. For the aid of bands of coper that leads high currents should him with . The Re1 should be handle the current of contact 5A at least.

The regulation is simple: First is regulated the Voltage of report with the R1 so that is activated the relay precisely in the 13,8 V. The R5 and the D3 attend to the delay - regulated with the R2 - between Voltages of end and repetition.The Voltage in the spike of 3 A1 should correspond in half the desirable tendency that means the beginning of repetition.

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D:\My documents\Warehouse\Novri_yadi\Schematic Files\New Schematics\AUTOmotive\Automatic ACCU Charger.doc

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Parts List : R1 = 470Ù R2,R3 = 100K/1% R4,R7 = 1M R5 = 100K R6 = 8K2 R8 = 10K R9 = 270Ù R10 = 3K3 R11 = 22K R12 = 270K P1,P2 = 5K trimpot

C1 = 1n5 C2 = 100ìf /16v D1�D6 = 1N4148 D6 = LED green. D7 = Zener 5V6/400mW D8 = 1N4001 T1 = BD679 IC1 = LM324

Original Article by : http://www.electronics-lab.com/projects/power/004/index.html