voltage clipper / Voltage limit.

[Jaikanth.V]

Hi,

I'm looking a circuit/product that something like a voltage limiter / Voltage clamper.
The limitation of the voltage range is up to 20 V. DC
If the voltage is exceeding more than 20 V then the circuit must work like a voltage clipper.
Finally i want to pass the voltage which is less than or equal to 20 V. DC

any product is available in the market?
if not advise how to build a circuit.


The current, i don't know exactly but i can tell you that it will not exceed more than an ampere.
Thanks.

 

[Reloadron]

Depending n what the final current is and the max voltage you may want to look into zener diode based circuits.

Ron

 

[alec_t]

Perhaps a varistor or other transient suppressor? How sharp a cut-off do you need?

 

[Jaikanth.V]

Hi Ron,

Any tutorial link i can follow?

thx.

 

[Reloadron]

As to the uses of a zener diode a Google will bring up a dozen hits like this one. However, it would be wise to answer Alec's question as to how sharp of a cutoff? My reply was pretty generic in suggesting using a zener and one of several options.

Ron

 

[crutschow]

A low dropout voltage regulator may work. If its voltage output is set to 20V then it will pass anything below 20V with a small drop, but limit the output to 20V.

What is the minimum voltage you need to pass?

 

[Jaikanth.V]

How sharp a cut-off do you need?

When the input signal reaches 20V, it is not mandatory for me to cut as much sharp. few milli volts deviation is also OK.
thanks.

 

[Jaikanth.V]

A low dropout voltage regulator may work. If its voltage output is set to 20V then it will pass anything below 20V with a small drop, but limit the output to 20V.

Great this is what i'm looking for!

What is the minimum voltage you need to pass?

Minimum at least one volt.

thanks.

 

[alec_t]

few milli volts deviation is also OK.

In that case varistors and zeners alone won't suffice. Go with Crutschow's suggestion.