Trasnformer Design for Voltage Stabilizer

[Golden Electronics]

I require voltage stabilizer Transformer tap idea with following specification

1. Input voltage Range = 100- 270 VAC, 50 Hz & 5A load current
2. Output voltage = 230 V +/- 10%
3. Isolation not require & cost,size minimum

Transformer must be low cost & have maximum 5-7 tap. I select require tap according to input voltage so that output remain withing range.

I plan following tap

0-100-125-150-175-200-225-225-230 V all voltage at 230V input

Please suggest transformer tap voltage so that I can keep output voltage within range

 

[KlausST]

Hello,

you say +/- 10%, this means a max. of 20% per step. To have some headroom i suggest steps with 15%.
So the taps are: 0 - 100 - 115 - 132 - 152 - 175 - 201 - 231 input.

You can try to switch with SCR or Triacs. But have in mind not to cross conduct and get a short circuit condition....
Also have in mind the inductive load of the transformer, that means that the SCR does not open on zero cross of mains voltage but on zero cross of transformer current.
This may be up to 80 degrees later - depending on transformer an load.

Klaus

(edit 1: corrected mistakes)

 

[pnjbtr]

2. Output voltage = 230 V +/- 10%

With these values out put volts are 207 to 253.
253 volts are not good for some products.
Generally out put range should be 200 to 245.
Ideal taps are 0-110-130-155-185-220.(input range 110-240 & output range 200-245 with 4 steps).
For 5 amp current we need 5*110=550+15%=586 watt core.

 

[sahu]

Hello,

you say +/- 10%, this means a max. of 20% per step. To have some headroom i suggest steps with 15%.
So the taps are: 0 - 100 - 115 - 132 - 152 - 175 - 201 - 231 input.

Klaus

how can calcute these steps ?
my means what's the equation of calculate these steps .

 

[KlausST]

Hi,

If you want to add 15% you hve to multiply wit 1.15. Every value to the next.

Klaus

 

[andre_luis]

Isolation not require & cost,size minimum

Check the calculus done at this article and make proper adaptations to fit your range requirements.

 

[BradtheRad]

Since you do not require isolation, consider using an autotransformer (autoformer). This has one winding, serving as both primary and secondary.

It results in less copper, less bulk, less cost.

You'll use a tap arrangement similar to a transformer.

Or, consider getting a variac. It must be rated to handle your spec current. However I'm not sure if one is made to step up 100VAC to 230V.

 

[sahu]

how can find 1.15 ?

 

[KlausST]

Hi,

how can find 1.15 ?

The op wants

2. Output voltage = 230 V +/- 10%

you say +/- 10%, this means a max. of 20% per step. To have some headroom i suggest steps with 15%

15% --> 1.15

Klaus

 

[sahu]

op 230-+7.5%

this means a max. of 15% per
step.
o....k !
if I have need 230-+11%
this means a max. of 22% per
step
so what the value of multfiling ?

 

[KlausST]

Hi,

this means a max. of 22% per
step
so what the value of multfiling ?

Any value smaller than 1.22.

Klaus