variable current source upto 25A @ 230VAC

Hi all,

Kindly give me some idea/suggestions to achieve this adjustable current up to 25A in 230VAC, There will be lot of sources for dc output power supply but i don't have have that much idea in AC output power supply. Share any related links.

Kindly give me some idea/suggestions to achieve this adjustable current up to 25A in 230VAC, There will be lot of sources for dc output power supply but i don't have have that much idea in AC output power supply. Share any related links.

Click to expand...

Hi santhosh my friends from india,
you use a resistance in series or capacitance with Xc=1/2*pia*f*C

An auto-transformer give 0 - 250V variable voltage source.

Hi,

25A on 230V is a lot of power.

****
Please gice more information:
When you connect a scope to measure the current, then what signal do yu expect from your "current source?"
1) a clean sine wave with an RMS current of 25A
2) a phase controlled signal with RMS current of 25A
3) a constant DC current of 25A for the positive halfwave and a negative DC current over the complete negative halfwave? (both as good as possible)

***
a) Do you like to drive an existing load with the 25A and the load dissipates most of the power?
b) Or do you like the "constant current source" to dissipate all the power? (as current sink)

*****
Generally ... asking questions:
Don´t expect our answers to be more detailed than your question.
If you want fast and detailed answers, then give pictures, schematics, values and other usefull informatons.

Klaus

iop95 said:

An auto-transformer give 0 - 250V variable voltage source.

Click to expand...

I need to adjust current from 0-25A but a constant 230VAC. Is it possible to work with a current comparator circuit with circuit breaker, if it exceeds the set current immediately will trip the circuit breaker

dsanthosh67 said:

I need to adjust current from 0-25A but a constant 230VAC.

Click to expand...

This gets complicated. You recall Ohm's law: V=IR

If you set any two, the other (remaining one) gets set automagically. You cannot set all the three yourself.

Normally R is set by the load. For a given voltage, the load will determine the current. You cannot adjust both current and voltage with an arbitrary given load.

If you want to limit current to 25A max, then it is a different story altogether. You can use a fuse or a circuit breaker of a given current rating.

Sounds like you need an electronic circuit breaker, these are large IGBT's (emitter to emitter) controlled so that when a peak and/or average current is exceeded they turn off...