The entire circuit is powered with rectified dc supply but the regulated power is connected to timers and unregulated power is connected to potentiometers to get the variable voltage.
Over voltage protection circuit.
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.
And when q2 is in off condition the base terminal of q1 will be low and it allows the current to flow through it.
Continuous protection while in an over voltage condition as occurs with double battery.
Obviously this form of over voltage protection requires circuits that are specific to the particular circuit and switch mode power supply chips used.
The circuit is designed from low cost.
This is a shunt regulator diode.
Overvoltage protection circuit diagram working of overvoltage protection circuit.
Short circuit protection reverse polarity protection and over under voltage protection are some of the protection circuits that are used to protect any electronic appliance or circuit from any sudden mishappenings.
It is meant to use with 12v rated circuits devices.
Working of overvoltage protection circuit.
When the voltage is less than the preset level the base terminal of the q2 is high and as it is a pnp transistor it turns off.
Generally fuse or mcb is used for overvoltage protection however in this project our aim is to make a circuit which can perform better than a fuse or mcb and overcome the.
Over voltage protection circuit using zener diodes every circuit design operates at different voltage levels the most common voltage levels for a digital circuit are 3 3v 5v and 12v.
Over voltage protection using timers circuit operation.
Each has its own advantages and disadvantages and the choice of technique needs to be made dependent.
This way it will cut off the power supply to protect the device from overvoltage which may cause to damage the connected device.
All three techniques are used and can provide effective power supply over voltage protection.
So it will establish protection over 13v and moreover this will give the power supply necessary.
An overvoltage protection circuit will operate when the supply voltage increases up to 110 to 130 above the rated voltage of a device.
But every design is unique and it is also common for a circuit to have more than one operating voltage.
In this project we will build a simple yet effective overvoltage protection circuit using a fuse and a zener diode as the protecting elements that will work for electronics that.
The above circuit is designed to protect the circuit that connects to it from voltage over 13v.
An overvoltage protection circuit is a circuit which protects electronics from excess voltage which could potentially damage or destroy electronic components.
Automatic equipment disconnect when the power cross the level of a fixed voltage.
This circuit protects from high voltage.
Generally 12v devices will have a tolerance up to 13v.
Both the timers are configured to work as comparators i e as long as the input present at the pin2 of timer is less positive than 1 3 vcc then the.
