Hi Everyone,

What should be the current rating of low voltage transformer used for buck and boost operation in an automatic stabilizer?

Is current rating of the transformer relevant for the operation?

thanks

 

The current rating is larger than the max current it has to handle.

Bob

 

If we knew what an "automatic stabilizer" was we might have a clue about the answer to you question.

 

It all depends upon how much power the transformer must deliver.

 

If we knew what an "automatic stabilizer" was we might have a clue about the answer to you question.

hi,

I am talking about automatic voltage stabilizer which uses buck and boost to stabilize voltage in a certain range.

sorry, for the confusion.

thanks

 

It all depends upon how much power the transformer must deliver.

250 watt, main voltage supply - 230 volts

 

Can you figure out how much current is needed to provide 250W at 230V?

Bob

 

Can you figure out how much current is needed to provide 250W at 230V?

Bob

I think it will be 1.4 Amps with adding power factor because it will be running an induction motor.

 

hi,

I am talking about automatic voltage stabilizer which uses buck and boost to stabilize voltage in a certain range.

sorry, for the confusion.

thanks

So you start with the AC mains and you want an AC output or a DC output. I ask because "buck" and "boost", are in my experience, used in DC-DC converters. So what are you actually trying to do? Where does the power factor correction come in.?

 

You have automatic tap changers and you can have motorized Variacs do the work too. You just don't want to switch the taps frequently.
I think the idea is to put a multiple-tapped transformer in series with the mains, so you can add or subtract from the line voltage.

 

Hi Everyone,

What should be the current rating of low voltage transformer used for buck and boost operation in an automatic stabilizer?

Is current rating of the transformer relevant for the operation?

thanks

Is the transformer being referred to the one for the Control Circuitry or for the Load?

If it's for the load, then the "low" voltage winding will need to handle the Load Current.

 

I got one pic of 140-280v transformer winding data, current rating 0.25 KVA

output is 220 v with variation of 9%. It is an auto transformer But I am not sure how it will work. If anyone knows, please tell me.

 

Tap #1 has a strange connection.

 

But I am not sure how it will work.

It will 'work' much the same as any other transformer, except that the windings are all in series so aren't isolated from each other. There is a consequent risk of electric shock!!
In itself it doesn't provide any stabilisation.

 

I got one pic of 140-280v transformer winding data, current rating 0.25 KVA

output is 220 v with variation of 9%. It is an auto transformer But I am not sure how it will work. If anyone knows, please tell me.View attachment 179278

Does this give any idea

 

Does this give any idea

View attachment 179459

so, it is substracting the voltages?

 

In this setup, yes. What happens if the Secondary Terminals are Interchanged?