Over Voltage Protection Circuit Diagram

Lm393 has 2 comparators.

Over voltage protection circuit diagram.

The working of the circuit is discussed further below. Only one transistor and some other components are used in this overvoltage protection auto circuit. 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. Overvoltage autocut circuit diagram this autocut circuit is very easy simple and very useful.

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. This zener diode circuit uses the zener diode in a slightly different way detecting the breakdown current through the diode once a certain voltage has been reached. Load is connected with nc normally connected pin of the relay. Automatic equipment disconnect when the power cross the level of a fixed voltage.

Here is the basic schematics of the upper lower voltage circuit. One of the comparators is sensing the higher voltage and another comparator is sensing the lower voltage. To understand the basics of the overvoltage protection circuit let s take the circuit apart in order to understand the basic working principle of every. Overvoltage protection circuit diagram working of overvoltage protection circuit.

Obviously this form of over voltage protection requires circuits that are specific to the particular circuit and switch mode power supply chips used. It is meant to use with 12v rated circuits devices. So it will establish protection over 13v and moreover this will give the power supply necessary wiggle room to operate. Generally 12v devices will have a tolerance up to 13v.

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. Overvoltage protection circuit using timers. Over voltage protection circuit using tl431 shunt regulator ic. How 230v mains overvoltage protection circuit works.

This circuit protects from high voltage. Zener diode circuit for overvoltage protection. Overvoltage and under voltage protection circuit diagram. All three techniques are used and can provide effective power supply over voltage protection.

In the normal operating conditions between 160 and 250 v the output of the timer 1 is held low so the transistor 1 is in cutoff state as a result the reset pin of the timer 2 is high which causes to output at pin 3 is high so the transistor 2 conducts and then the relay coil gets energized. This is a safety device to overvoltage. How the upper lower voltage works. The above circuit is designed to protect the circuit that connects to it from voltage over 13v.

This circuit is a very useful auto cut circuit to the protection of any electrical or. The complete circuit diagram for our main over voltage protection is given below. This is a shunt regulator diode. As per datasheet tl431a is the three terminal programmable integrated circuit.