Over Voltage Cutoff Circuit

In most of the commonly used portable electronics devices like laptops smart phones and others the li ion batteries with 4 2 v of peak limit of the terminal voltage are used.

Over voltage cutoff circuit. This circuit automatically cuts the current supply to any appliance from the input circuit. The potentiometer vr1 is connected to timer 1 for under voltage cutoff and the vr2 is to second timer for over voltage cutoff. So it helps to protect the circuit damage by the high voltage. 2 the circuit the circuit shown in figure 1 is a precision series disconnect that was designed to protect a switching regulator load that had an absolute maximum input voltage of 24v.

The two transistors are connected to two timers for making switch logic. When the input voltage goes high then the relay will be activated and also when the input voltage is below then required level then relay activated. In particular if the voltage of the motor is lower the coils of it can be a burn. The ultimate high low voltage protector circuit.

If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v. Practically the protection circuit designed in this electronics project cuts off the battery from the charger when the battery voltage goes beyond 8 37v. The circuit is designed from low cost. This circuit is a modified version of the previous one and is able to switch of the load and itself in case the input voltage reaches dangerous levels.

And when the voltage decreased at a normal level then automatic on the supply. This is an over and under voltage protection circuit device sound disappeared. Though the circuit is reasonably accurate the window threshold is too wide meaning the circuit triggers only for voltage levels above 260v and below 200v or above 130v and below 100 v for 120 v normal supply inputs. Continuous protection while in an over voltage condition as occurs with double battery.

Since in this project batteries with cut off limit of 4 2 v are used for power supply so using two batteries in series set the cut off limit to 8 4 v. If any device needs 12v to work properly then this can be damaged by increasing the voltage. This voltage sensor circuit can be used to protects any appliance to voltage fluctuation. The circuit of auto cut circuit for over and under voltage can only operate in range of 160v ac to 270v ac other than this range of voltage i e.

Under 160v ac or over 270v ac the relay connected to the output of ic 3 is deenergized as a result load will be off. Overvoltage protection circuit using timers. I need a circuit that ll monitor voltage of a battery 3s lipo normal voltage of 11 1v minimum voltage of 9v but instead of a digital readout i only need 3 led s red yellow green for full 11 1v medium 11 0v 10v and low less than 10v and since it s for an airsoft gun i need it as compact as possible and preferably.