Reverse battery cutoff circuit for an actuator or the like
A reverse battery protection circuit for an actuator or the like. The circuit includes at least a first transistor and a second transistor which is coupled to both the first transistor and a voltage supply in a manner wherein the second transistor is adapted to turn the first transistor off in the event of an interruption in the voltage supply.
1. A battery protection circuit comprising:
a voltage supply;
a first circuit section coupled to the voltage supply and including at least a first transistor; and
a second circuit section coupled to both the voltage supply and the first circuit section and including at least a capacitor and a second transistor coupled to the capacitor and adapted to turn the first transistor off in the event of an interruption in the voltage supply, the first transistor being located on a first circuit line and the second circuit section further comprising a resistor located on a second circuit line in series with the capacitor, the second transistor including an emitter coupled to the second circuit line at a point on the second circuit line between the capacitor and the resistor.
2. A battery protection circuit comprising:
a voltage supply;
a first circuit section including:
a first circuit line coupled to the voltage supply;
a first transistor on the first circuit line;
a second circuit line;
a first resistor extending between the first and second circuit lines;
a first diode extending between the first and second circuit lines; and
a second circuit section including:
a second transistor including an emitter and a collector coupled to the second circuit line;
a third circuit line extending between the first circuit line and the base of the second transistor, the third circuit line including a second resistor; and
a fourth circuit line extending between the first circuit line and a ground terminal, the fourth circuit line including a third resistor and a first capacitor coupled in series, the emitter of the second transistor being coupled to the fourth circuit line at a point between the third resistor and the first capacitor and the first capacitor being adapted to hold the emitter of the second transistor high to turn the second transistor on and the first transistor off in the event of an interruption in the voltage supply.