battery protection

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vmail

Member - Posts: 17

Joined: April 21, 2003

Location: United Kingdom

Posted: August 30, 2009 at 3:12 PM / IP Logged

I have 2 2.8Ah 12V batteries connected in parallel.

I am after a circuit that will kill the supply to the load when the voltage drops to approx 10-ish volts

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: August 30, 2009 at 5:57 PM / IP Logged

How much current is your load pulling?

A general approach would be to use a 5vdc voltage regulator to create a solid reference point. Then, use a voltage divider circuit to cut your battery voltage by ~1/3.

Use an op amp set up as a comparator to compare your 1/3 battery voltage value and an adj voltage fed off the 5vdc regulator (this adj voltage would be your cut off and would equal (cut off voltage / 3) or 3.33vdc.

Your op amp would then feed a transistor that will power your load. When the battery voltage is higher then the cut off the output will be on, when it drops lower then the output shuts off.

Kevin Pierson

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battery protection

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