Dc Voltage Spike Protection Circuit

Also known as the let through voltage this specifies what spike voltage will cause the protective components inside a surge protector to short or clamp. Littelfuse is the world leader in circuit protection products and services offering. Dc input circuits can experience current overload short circuit conditions or voltage transients esd etc and require ptcs multilayer varistors and fuse protection to meet regulatory standards or to ensure reliable operation.

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This Circuit Can Be Used As A Surge Protector For Electric Appliances Tv Computer Etc From High Voltage Spikes Surge Protector Protector Electronics Projects

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The main purpose of a voltage suppression circuit is to clamp the voltage to a safe level.

Dc voltage spike protection circuit.

Given that no varistors have a voltage. In its simplest form it can be provided by using a zener diode placed across the output of the regulated power supply. Mov s are best suited for protection on bidirectional ac power supplies while zener diodes are best suited for smaller low energy dc supplies. Dc transient voltage suppressor circuit.

The tvs circuit we will build for dc power is shown below. Here in this circuit a 9v dc source is feeding the load which is a dc motor. Another very simple form of over voltage protection uses an approach called voltage clamping. The most common form of voltage clamping devices are metal oxide varistors mov s and zener diodes.

With the zener diode voltage chosen to be slightly above the maximum rail voltage under normal conditions it will not conduct. This means that if the circuit were to receive voltage above 12v the zener diode would then break down and begin conducting. A lower clamping voltage indicates better protection but can sometimes result in a shorter life expectancy for the overall protective system. To find the voltage rating of the mov allow for 20 headroom to account for voltage swell and power supply tolerances.

The zener diode used is rated for 12v. 24 v dc 1 2 28 8 v dc. Click on the green links to find littelfuse circuit protection solutions.

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