Electrical Engineering Glossary Definition for Overvoltage Protection

Definition

Overvoltage Protector (OVP) refers to a circuit that protects downstream circuitry from damage due to excessive voltage. An OVP monitors the DC voltage coming from an external power source, such as an off-line power supply or a battery, and protects the rest of the connected circuitry using one of two methods: a crowbar clamp circuit or a series-connected switch.

The crowbar short-circuits or clamps the supply line to limit the voltage, possibly triggering other forms of protection such as a fuse. See Crowbar.

The series-connected switch uses a MOSFET or transistor connected as a switch in series with the supply line. During an overvoltage condition, the OVP circuit rapidly shuts off the MOSFET and disconnects the downstream circuit.

See: Protection and Isolation products.

Synonyms

• OVP

Related Parts

• MAX6495 - 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
• MAX6496 - 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
• MAX6497 - 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
• MAX6498 - 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
• MAX6499 - 72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
• MAX6397 - Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V
• MAX6398 - Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V
• MAX16010 - Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16011 - Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16012 - Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16013 - Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16014 - Ultra-Small, Overvoltage Protection/Detection Circuits

See Also

• Crowbar Circuit
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