Wiring a buck and boost from a standard transformer

[Jpflex]

My coworkers are having a problem with a transformer not putting enough volts out on the secondary.

I do not have further details from them but I was able take a small transformer and convert it to a buck and boost depending how I orientated the secondary while shunted to primary.

I used a small 9 volt battery for source and I was able to get the secondary to jump to 13 volts as I opened primary.

Besides voltage stress on transformer not designed for buck and boost I don’t understand all the benefits in a buck and boost transformers. Or in wiring a standard transformer to a buck and boost since transformers already step up voltage at primary.

Is it line voltage that is increasing in a boost where standard induction transformers only see transformation in secondary?

 

[Speedskater]

You can't use a battery to test a transformer's voltage ratio, the pulse is too quick to measure accurately. But you can use an old-fashioned low voltage AC wall-wort.

For just about everything you need to know about single-phase buck/boost transformers.
Bucking (And Boosting) Transformers
Copyright © 2010 - Rod Elliott (ESP)
Updated December 2019

Bucking Xfmrs

Bucking Transformers - What they do, how they do it, and how to determine the proper transformer to use

sound-au.com

The concern is the voltage & current ratings of the transformer that you select.

 

[Jpflex]

You can't use a battery to test a transformer's voltage ratio, the pulse is too quick to measure accurately. But you can use an old-fashioned low voltage AC wall-wort.

For just about everything you need to know about single-phase buck/boost transformers.
Bucking (And Boosting) Transformers
Copyright © 2010 - Rod Elliott (ESP)
Updated December 2019

Bucking Xfmrs

Bucking Transformers - What they do, how they do it, and how to determine the proper transformer to use

sound-au.com

The concern is the voltage & current ratings of the transformer that you select.

A transformer book I have been reading is where I got some info. I don’t remember how many volts were needed but the bucking and boosting results were observed when I did it. I also used the flukes max hold feature to catch the quick change

 

[ptonsparky]

Transformers used for Buck/Boost are simple 12/24 Volt. dependent on what voltage change you need. Two relatively small transformers can boost that 208 three phase to 240, or drop it.

 

[ActionDave]

My coworkers are having a problem with a transformer not putting enough volts out on the secondary. .....

Explain further. What kind of voltage are you getting, what are you needing. A buck/boost may not be the answer to the problem.

 

[LarryFine]

The secondary of a B/B transformer must be sized to carry the full current of the load.

The primary current only energizes the secondary, which is in series with the load.

 

[growler]

My coworkers are having a problem with a transformer not putting enough volts out on the secondary.

what type of transformer are they dealing with? What voltage are they putting in on the primary and what is supposed to be the secondary voltage?

 

[retirede]

A transformer book I have been reading is where I got some info. I don’t remember how many volts were needed but the bucking and boosting results were observed when I did it. I also used the flukes max hold feature to catch the quick change

What was observed was more likely the inductive effect from di/dt at disconnection. You can do the same experiment with a single inductor. Simply disconnecting a D cell can result in enough voltage to give you a pretty noticeable shock.