Battery protection circuit for multiple battery power supply and charging system
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United States of America Patent
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Jun 10, 2014
Grant Date -
N/A
app pub date -
May 10, 2013
filing date -
May 10, 2013
priority date (Note) -
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Abstract
A battery protection circuit for connection to a vehicle's auxiliary battery, auxiliary battery load and chassis battery that is connected to the vehicle's alternator. A switching control circuit, including a digital processor, has a voltage sensing circuit connected to the alternator, a voltage sensing circuit connected to the auxiliary battery, a ground terminal for connection to the vehicle's common ground and outputs for controlling switches. An electrically controlled first switch is interconnected between the alternator and the auxiliary load. The first switch has a control input terminal connected to an output of the control circuit for being switched between a closed state and an open state. An electrically controlled second switch is interconnected between the auxiliary load and the auxiliary battery. The second switch has a control input terminal connected to an output of the control circuit for being switched between a closed state and an open state.
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