Voltage detector relay

  
While the battery is being charged, its voltage is measured at V. If the measured voltage is lower than the minimum the relay will be energized, that wiU connect the charger circuit. When the battery voltage runs over the maximum set point, the relay is deenergized and it will be held that way until the voltage decreases below the minimum when it will be connected again.
Voltage detector relay - schematic

The voltage is lower than a threshold VB (low breaking voltage) the relay will be assumed that such a low voltage is due to one or several damaged battery components. Of course VB is much lower than the minimum set point.




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