Over Voltage Protection Circuit Power Supply

Over voltage protection is a power supply feature which shuts down the supply or clamps the output when the voltage exceeds a preset level.

Over voltage protection circuit power supply.

Most power supplies use an over voltage protection circuit to prevent damage to the electronic components. For protection from high voltage surge we always use overvoltage protection or crowbar protection circuit. When the power supply voltage increases too much a thyristor shortcircuit the output. The circuit has a few components it is very easy to build and will protect your electric equipment againg overvoltages.

Crowbar protection circuit is a type of overvoltage protection which is most commonly used in electronic circuits. Overvoltage protection is a characteristic of a power supply system which somehow deals with the voltage across the load side when the input voltage exceeds the pre set value. The over voltage protection circuit is based on brute force. In its simplest form it can be provided by using a zener diode placed across the output of the regulated power supply.

Another very simple form of over voltage protection uses an approach called voltage clamping. The crowbar circuit must be mounted between power supply and the protected device. This is a sequel to our anatomy of switching power supplies tutorial and we are going to explore in depth all power supply protections like over voltage ovp under voltage uvp.