Dc Voltage Spike Protection Circuit

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.

Dc voltage spike protection circuit.

24 v dc 1 2 28 8 v dc. Click on the green links to find littelfuse circuit protection solutions. A lower clamping voltage indicates better protection but can sometimes result in a shorter life expectancy for the overall protective system. The main purpose of a voltage suppression circuit is to clamp the voltage to a safe level.

Given that no varistors have a voltage. The tvs circuit we will build for dc power is shown below. Mov s are best suited for protection on bidirectional ac power supplies while zener diodes are best suited for smaller low energy dc supplies. To find the voltage rating of the mov allow for 20 headroom to account for voltage swell and power supply tolerances.

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. Dc transient voltage suppressor circuit. Littelfuse is the world leader in circuit protection products and services offering. The zener diode used is rated for 12v.

Here in this circuit a 9v dc source is feeding the load which is a dc motor. 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.