Dc Voltage Spike Protection Circuit

The tvs circuit we will build for dc power is shown below.

Dc voltage spike protection circuit.

Another very simple form of over voltage protection uses an approach called voltage clamping. The main purpose of a voltage suppression circuit is to clamp the voltage to a safe level. This means that if the circuit were to receive voltage above 12v the zener diode would then break down and begin conducting. 24 v dc 1 2 28 8 v dc.

Click on the green links to find littelfuse circuit protection solutions. The most common form of voltage clamping devices are metal oxide varistors mov s and zener diodes. To find the voltage rating of the mov allow for 20 headroom to account for voltage swell and power supply tolerances. Dc transient voltage suppressor circuit.

With the zener diode voltage chosen to be slightly above the maximum rail voltage under normal conditions it will not conduct. Here in this circuit a 9v dc source is feeding the load which is a dc motor. Littelfuse is the world leader in circuit protection products and services offering. 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. Given that no varistors have a voltage. A lower clamping voltage indicates better protection but can sometimes result in a shorter life expectancy for the overall protective system.