Over Voltage Protection Circuit

Automatic equipment disconnect when the power cross the level of a fixed voltage.

Over voltage protection circuit.

Control the surge voltage by adding a protection circuit (snubber circuit) to the igbt. Over voltage protection is a power supply feature which shuts down the supply, or clamps the output, when the voltage exceeds a preset level. Use a film capacitor in the snubber circuit, place it as close as possible to the igbt in order to bypass high frequency surge currents.

Overvoltage protection is a power supply feature that clamps the output or shuts down the power supply in higher voltage levels. This is a shunt regulator diode. For protection from high voltage surge, we always use overvoltage protection or crowbar protection circuit.

Overvoltage and continuous voltage fluctuations are the major problems of domestic power supplies in many areas. First, the circuit's maximum input voltage can be increased. Continuous protection while in an over voltage condition (as occurs with double battery).

In normal use, the 12v supply goes to the output via the reverse protection diode and fuse. This protection circuit acts as a voltage regulator and also circuit breaker, we have 5v load and hence we have used 5.1v zener diode, you can choose zener diode voltage range depends on your load or device voltage range. The crowbar circuit must be mounted between power supply and the protected device.

Every circuit design operates at different. Generally 12v devices will have a tolerance up to 13v. In some situations where the input voltage is higher than expected, we always use an overvoltage protection or crowbar protection circuit.

The zener diode is chosen to be slightly higher; This is a safety device to overvoltage. The thyristor or scr, silicon controlled rectifier can be used to provide overvoltage protection in a power supply circuit.