Over Voltage Protection Circuit

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.

Over voltage 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. And when q2 is in off condition the base terminal of q1 will be low and it allows the current to flow through it. This is a safety device to overvoltage. 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.

It is meant to use with 12v rated circuits devices. The circuit is designed from low cost. This circuit protects from high voltage. 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.

So it will establish protection over 13v and moreover this will give the power supply necessary. Over voltage protection using timers circuit operation. 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. 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.

Generally 12v devices will have a tolerance up to 13v. Obviously this form of over voltage protection requires circuits that are specific to the particular circuit and switch mode power supply chips used. 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. But every design is unique and it is also common for a circuit to have more than one operating voltage.

Continuous protection while in an over voltage condition as occurs with double battery. The above circuit is designed to protect the circuit that connects to it from voltage over 13v. Over voltage protection circuit using tl431 shunt regulator ic. Working of overvoltage protection circuit.

Overvoltage protection circuit diagram working of overvoltage protection circuit. Each has its own advantages and disadvantages and the choice of technique needs to be made dependent. 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.

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. As per datasheet tl431a is the three terminal programmable integrated circuit. All three techniques are used and can provide effective power supply over voltage protection.