# Find uses for this device:

Discussion in 'Electronic Basics' started by siliconmike, May 30, 2005.

1. ### siliconmikeGuest

I've developed a small device that trips a circuit if its power
consumption goes outside a bound.

There are quite a few machines (for example - pumps) whose power
consumption depends on the input voltage.

Such machines may get damaged in case the external conditions go
berzerk. (example when there is no input to a submersible pump). In
such cases the power input fluctuates. (The current input fluctuates,
but unpredictably in many cases)

My device is initially programmed with 2 graphs:

1: of Maximum Power versus Input-Voltages of the machine it intends to
protect.
2: of Minimum Power versus Input-Voltages of the machine it intends to
protect.

The device interpolates and makes this graph smooth.

When the power consumption of the machine goes out of bounds for a
given input voltage, it trips the machine.

First, does such device exist in the market ? If yes, what is it called
?
What are the other uses one could contemplate for this device?
(It was originally made for pumps)

Thank you
Mike

2. ### siliconmikeGuest

In rural India they want the bore-well pumps to work right from 110 VAC
to 300 VAC. But if the bore-well runs out of water, they want to trip
thte pump.

This is where this device is used.

3. ### Gene S. BerkowitzGuest

Yes, it exists, and I have one in my basement, to protect my well pump.
http://www.franklin-electric.com/Prod_text/item8.htm

--Gene

4. ### Rich GriseGuest

Yes.

If yes, what is it called
A Fuse.
You're Welcome!
Rich

5. ### Rich GriseGuest

What you really need to do, then, is sense for the presence of water.

If what you're using now is working, then don't fix it, but there is
very little in the way of electrical equipment that runs on that broad
of a range of input voltages, without some kind of switchover arrangement;
usually the power source is much more well-regulated and predictable
than that.

Sorry.
Rich

6. ### siliconmikeGuest

Yeah right! Fuse doesn't cut power on under-load conditions..

7. ### Mike BergerGuest

It does if the under-load condition causes excessive current
draw.

8. ### joecoinGuest

How can that happen?

Joe