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12V,24V battery automatic charger circuit

2016-05-11 14:47  
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12V,24V battery automatic charger circuit
unijunction transistor BT33, C3, W1, W2 and other components form the relaxation oscillator.The pulse signal produced by he relaxation oscillator is transmited through isolation diode D4 to the control pole of thyristor SCR1 , adjusts the resistance of W1 to change the trigger the conduction angles of SCR1, which changed the charge current. Thyristor SCR2, relay J, W3, W4, D5 and other components form the storage battery in automatic protection circuit, when the battery voltage isfillingto the upper limit the W3, W4 set, D5 breakovers, SCR2 is triggered to breakover, LED2 display and relay picks, at the same time J switches to the normally open, cuts off SCR1 control pulses focused, that is to stop charging the battery. K2 is 12V, 24V battery charging switch, the icon places12V stalls.