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Aug31-11, 10:56 PM
P: 3
I am currently running a DC motor in an electric vehicle. A lithium polymer battery powers a motor controller which is connected to said DC motor to drive the car.

The lithium polymer battery as you would imagine has a battery monitoring system on it. One of the conditions it protects against is an undervoltage condition. When the car accelerator is set to 100%, the voltage will instantaneously drop from ~26V to ~17V for a short time tripping the undervoltage condition and opening the breaker. This shuts off the car.

What solutions exist? Could a series diode and parallel capacitor be added to smooth the instantaneous spikes? If so, what method could be used to calculate the required capacitance of the smoothing capacitor? If not, what other circuit elements could be used to prevent this instantaneous voltage drop?

Thank you in advance for any help or suggestions you can provide.
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