Power limitter, energy limiter, or whatever

do you know what is power limitter or energy limitter??
i have some urgent business with this thing,, so if some one know it please fell free to tell me..
thanx..

one posible power limitter is a power supply specially a switched power supply.

power limiter could be a generic feedback from a sensor that is measuring energy. Is up to you decide what is the sensor and what is the conntroller device. In some electronic power supply you can measure current with a resistor and limit the current with transistors.

is it related to coding?? coz my friend said all i have to do in this project is make a source code for the energy limitter using PIC microcontoller..

Added after 2 minutes:

pierpaolo said:

In some electronic power supply you can measure current with a resistor and limit the current with transistors.

Click to expand...

how can we measure current with resistor?

oracion said:

how can we measure current with resistor?

Click to expand...

Read a voltage across the resistor, and convert with ohms law

I = V/R

So if the resistor is 10 Ohm and you read 2 Volts...

I = 2 / 10 = .2 Amps

A PIC is be able to measure such a voltage and do that math.
edit: You may need to use an ADC with a floating ground tho...?? /edit

Defining a power limiter depends upon application.

Power limiters are mostly used at microwaves, to protect sensitive devices from an excessive power. Such limiter often use a pair of detector diodes connected back to back; opening each P/N junction "swallows" a part of input power and only a small fraction (leakage) passes to output. Other limiters use PIN diodes controlled by detector diodes, and the like.

Power limiters are used in electrical and mechanical systems to prevent damage. Usually there is a power sensor and a threshold detector which, upon exceeding a limit, cuts or blocks the input power. Such devices utilize feedback and can be quite complex.

You can build a simple power limiter to block high noise levels from a loudspeaker. Connect two silicon diodes back-to-back across speaker terminals- it allows you to hear a moderate volume while a higher volume is "swallowed" by the diodes.

read data sheet first

You can build a simple power limiter to block high noise levels from a loudspeaker.

Click to expand...

Also an effective method to ruin your power amplifier, I fear. :grin:

I used such primitive diode limiter to reject interference bursts from my HF radio. Who fears about his power amplifier, the simplest protection is to use a series resistor before all that.
In principle, many microwave limiters operate like that- they load the source to protect the load following the limiter.