Regarding step down transformer output

[Embedded_Geek]

Does the output of a step down transformer vary linearly with the input. Theoretically it should vary (according to the relation between the turns ratio and the voltages at both the windings).

But I would like to know does it vary linearly practically. I am asking this because I don't have a variable AC source to verify the same.

Waiting for help / suggestions.


Thanks in advance,

 

[crutschow]

If the transformer is operating within it's specified operating limits, then yes, the output voltage is quite linear with respect to the input voltage. Audio transformers, for example, can have very low distortion over a wide frequency and voltage range.

 

[Embedded_Geek]

If the transformer is operating within it's specified operating limits, then yes, the output voltage is quite linear with respect to the input voltage. Audio transformers, for example, can have very low distortion over a wide frequency and voltage range.

Thanks crutschow

I would like to know how can I find the operating limit. All I know about the transformer are:

Input (Primary Side) :230VAC
Output (Secondary Side) : 12VAC
Current Rating: 500mA

Using the above parameter how will I define the operating limit.

Waiting for suggestions.

Thanks in advance,

 

[Tunelabguy]

Thanks crutschow

I would like to know how can I find the operating limit. All I know about the transformer are:

Input (Primary Side) :230VAC
Output (Secondary Side) : 12VAC
Current Rating: 500mA

Using the above parameter how will I define the operating limit.

Waiting for suggestions.

Thanks in advance,

It appears this is a power transformer. Therefore it is designed to operate at power line frequencies (50Hz or 60Hz). It will not behave like a broadband audio transformer, in case you were planning on using it that way. As for the 500 ma. current specification, that looks like it is a specification for the 12 VAC winding. Above that current you may get overheating or core saturation, or both. As long as you ensure that winding does not have more than 500 ma., the response should be linear, as you lower the voltages involved (keeping the same power line frequency).

 

[Embedded_Geek]

It appears this is a power transformer. Therefore it is designed to operate at power line frequencies (50Hz or 60Hz). It will not behave like a broadband audio transformer, in case you were planning on using it that way. As for the 500 ma. current specification, that looks like it is a specification for the 12 VAC winding. Above that current you may get overheating or core saturation, or both. As long as you ensure that winding does not have more than 500 ma., the response should be linear, as you lower the voltages involved (keeping the same power line frequency).

Thanks Tunelabguy ,

Actually what you have said is with respect to the current. Assume the load is very low or no load then will the output voltage vary linearly with the input?


Thanks in advance,

 

[crutschow]

With no/low load the transformer will generally behave more linearly with voltage change.