Over Voltage Protection Circuit Breaker. 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. This way it will cut off the power supply to protect the device from overvoltage which may cause to damage the connected device.
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Analog devices family of high voltage surge stoppers overvoltage protection overcurrent protection and circuit breaker ics offer solid front end protection in small low power easy to design solutions that increase system reliability. When the input voltage reaches 15v the zener conducts setting up a voltage across r2. In some situations where the input voltage is higher than expected we always use an overvoltage protection or crowbar protection circuit.
In normal use the 12v supply goes to the output via the reverse protection diode and fuse.
An overvoltage protection circuit will operate when the supply voltage increases up to 110 to 130 above the rated voltage of a device. Simple over and under voltage protection circuit from the circuit when the voltage is 220 volts ac through a transformer t1. A crowbar circuit shown in figure 1 can protect your device from overvoltage. In normal use the 12v supply goes to the output via the reverse protection diode and fuse.
