Quote:
Originally Posted by mcudogs
Monitor the whole battery pack voltage using a linear optocoupler cct fed to an a/d input of the atmega. This would be used to shut off the main contactor or reduce motor current when minimum pack voltage is reached. This would not take into account low voltages on individual cells.
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There's an implementation that does not require a linear optoisolator. Simply have a small capacitor charge from the battery through a resistor and connect a diac circuit that periodically discharges the capacitor. Use a regular optoisolator or a signal transformer to couple the pulses and then measure the frequency.
You can build a battery balancer using either charge pumps or a multiwinding flyback transformer.
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