Over Voltage Cutoff Circuit

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.

Over voltage cutoff circuit.

Practically the protection circuit designed in this electronics project cuts off the battery from the charger when the battery voltage goes beyond 8 37v. Over voltage and under voltage protection circuit for high and low voltage cutoff. If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v. The potentiometer vr1 is connected to timer 1 for under voltage cutoff and the vr2 is to second timer for over voltage cutoff.

Thus this circuit will not only cut off during low voltages but also will provide a total over voltage protection to the entire house or premises. The circuit is designed from low cost. 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. And when the voltage decreased at a normal level then automatic on the supply.

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. Continuous protection while in an over voltage condition as occurs with double battery. 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. 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.

The two transistors are connected to two timers for making switch logic. If any device needs 12v to work properly then this can be damaged by increasing the voltage. 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. Overvoltage protection circuit using timers.

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. The ultimate high low voltage protector circuit. When too much voltage 220v and protection when pressure is too low with using the relay cut off power when voltage problems. 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.

This voltage sensor circuit can be used to protects any appliance to voltage fluctuation. This is an over and under voltage protection circuit device sound disappeared. In particular if the voltage of the motor is lower the coils of it can be a burn.