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Unattended storage battery automatic power supply device cir

2016-05-10 01:46  
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Unattended storage battery automatic power supply device circuit
Unattended storage battery automatic power supply device circuit
The operating principle: This device has two parts: one part is composed of the step-down transformer, the rectifier stack, the voltmeter, the ammeter; another part is the control part. The circuit is as shown in figure 4-32. The 220V city electricity is reduced by the transformer and is rectified by the diode to charge the storage battery, when the voltage of storage battery increases to 14.2V, the potential of A point is 4.37V, the potential of B point is 4.7V, the potential of A point is higher than the B point, the op-amp IC is the voltage comparator, so the IC outputs the low level, the transistor VT cuts off, the relay K loses the electric and the transformer disconnected the 220V city electricity, the charging stops.