Dc Voltage Spike Protection Circuit

To find the voltage rating of the mov allow for 20 headroom to account for voltage swell and power supply tolerances.

Dc voltage spike protection circuit.

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. 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. This means that if the circuit were to receive voltage above 12v the zener diode would then break down and begin conducting.

In its simplest form it can be provided by using a zener diode placed across the output of the regulated power supply. The zener diode used is rated for 12v. Click on the green links to find littelfuse circuit protection solutions. Given that no varistors have a voltage.

Mov s are best suited for protection on bidirectional ac power supplies while zener diodes are best suited for smaller low energy dc supplies. Here in this circuit a 9v dc source is feeding the load which is a dc motor. A lower clamping voltage indicates better protection but can sometimes result in a shorter life expectancy for the overall protective system. 24 v dc 1 2 28 8 v dc.

With the zener diode voltage chosen to be slightly above the maximum rail voltage under normal conditions it will not conduct. The most common form of voltage clamping devices are metal oxide varistors mov s and zener diodes. Dc transient voltage suppressor circuit.