Auto Tapping Transformer

Hi, sonicguy!

I'm puzzled by your question. If this is your final year project, then presumably you already are supposed to possess the information about how/where to take off the transformer and design the feedback circuit.

Unless the course you are taking is philosophy, and you never studied the actual subject you are writing about because the circuit diagram is just a way for you to show the meaning of electricity to our lives, or something like that, why would you be asking us to do the work for you?

Please help us out here with a little explanation that may help us to be a little more forthcoming.

I can tell you from experience that this is not a website where folks will help you do what you seem to be asking if it's something you are supposed to be doing for yourself.

Good luck with your project. It doesn't sound very difficult at all, once you'll get down to it.

Mark

oh..sorry..i know that is rude to ask for solution here...i just want some guidance to do that..Anyway, i appreciated your advice...

My previous idea is to setup some comparators as voltage sensor on the primary side of transformer, and send a feedback signal to VB program (computer or pic) and then the VB would control the tapping path which is consist of few relays and those relays are the different path from primary part to secondary part of the transformer...so i curious is that a right concept?

Hi, sonicguy!

How would the comparitor array be calibrated? What kind of feedback signal would it send? What's in the program? How would the tapping path get altered?

When IBM developed its first computers, they filled an entire room and only did a simple job. Do you want to fill an entire room to do this?

[BTW, have you checked the internet for companies who produce this product already to see how they do it? Of course, if you copied them you would be charged with plagiarism and be given an automatic failing mark and possibly be removed from your faculty. But if you don't copy them, and create your own system...just using them to get ideas, then you are doing legitimate research. Just be certain to give credit to each company in your research on your final paper.]

Mark

Hi, sonicguy!

Your concept is good. You have a lot of work to do to execute the project, though.

Mark

So, if I understand your assignment correctly, you are to design a feedback loop into VB and have it function just like a modern day PWM (Pulse Width Modulator) convertor which varies the input signal pulse width (and or frequency on some circuits) to control the output.

National Instrument makes a number of A/D and D/A boards which should help you out with your quest and they make a number of the circuits which I described above.

Why bother with a computer? Talk about over engineering it!!

Use your comparators to switch a motor to drive a Variac auto transformer the right direction to get the correct voltage.. Simple!!

John.

What's a VB?

A motorized VARIAC will do the job with feedback control.

Bill, I think he intends to use the programming language Virtual Basic, or is it visual Basic?

That's what I think VB means, could be wrong though

John.

I think sonicguy's in a heap o' trouble . . .

To wit: "So a sensor is used to detect this drop and send it to VB."

Wonder if he has a data acquisition card or wants a lab assistant with a voltmeter to tell him verbally, "Your transformer output voltage is too low (or high)," and use a voice recognition system and with a microphone input to report it to his VB program.

sonicguy, if you're taking a control systems course, you missed something along the way.

Sorry, I can't teach you everythinng you need to know.

You are doing project for final year thats ok , thease are already done , you can find them in UPS ,stabiliser ,power regulators,just understand basic regulation that is done through analog circuits ,than research with digital circuits , like interfacing with ADC /DAC , than to PC ,than ..........simple to complicated . better have a talk with your project guide

sonicguy,

It seem like your project purpose is to stabilize output voltage. Voltage stabilizer have represent yours, it stabilize the output voltage by stabilizing the input voltage from fluctuation. This section is discussed in the "power quality chapter".

I see from your short description you'll put the sensor at output, sent the feedback to input. When voltage fluctuation occur, the closed-loop circuit will compensate to stabilize the voltage. But see, the voltage have already either step up or down, the output circuits have tasted the voltage fluctuation, you must think the surge withstand of equipment/components.

IEEE standard 1159-1995 have described about your concern (read: project). 7 types of power quality disturbances and its time-duration, you must explore it.

An ounce of prevention....great point, Abu Khansa! I'm not current with this type of voltage stabilization. Your observation is very much appreciated here. I hope sonicguy gets the message and adapts his system accordingly.

Mark

This is nothing but a voltage stabilizer However, you have forgotten to tell us:

1. AC or DC?, And I am talking about this power supply output. Depending on the output, and load type,you than choose how to stabilize.
2. what are your tolerances?

And let me suggest,: As this is being YOUR project, present us with YOUR solution to the problem, and ask for opinions. THIS is how one learns, Don't be a copycat.

Wangito.