| yusuf |
I am planning to built 220V Voltage Stabilizer for home theter. Can anyone provided reference of such project including schematic to start with.
Many thanks |
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| AndrewT |
Hi,
I think an AC voltage stabiliser will be quite difficult.
Is the normal tolerance of +-6% here in the UK exceeded in India?
Which parts of your system require good voltage stability? |
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| yusuf |
Yes. it's quite excessive here and occuasionaly shoots up to 260-270V.
Yusuf |
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| AndrewT |
Hi,
>+20%!!!
Could some or all of your equipment tolerate switching of tappings on an isolating transformer.
Relays will probably not be suitable but FETS could operate very quickly and not wear out. |
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| yusuf |
good point...I have to see but I guess it would be better than exposing to high voltage. Any pointer to refernce design based on FET or relay?
Thanks |
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| dnsey |
It used to be possible to obtain self-regulating transformers.
I can't really remember the principle - something to do with a gapped core - but it seems like the sort of thing you need. |
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| yusuf |
Thanks dnsey. However, CVT are too expensive for my budget, hence I will have to go with tapped transformer with some kind of switching.
Yusuf |
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| Eva |
There are several approaches to get a stabilized mains supply:
Ferrorresonant: A big inductor or transformer is allowed to saturate more or less in a controlled way depending on input voltage. Output voltage is limited as a result, but the waveform becomes distorted and further filtering is required. There are no active components and the system can react very quickly to input transients.
Variac controlled by a servomotor with output voltage feedback: This method is very straightforward and does not distort the sine wave, but the regulation is somewhat slow and there are mechanical parts subect to wearing out.
Big transformer with a lot of taps: Similar to the variac method, but the switching is done with solid state devices and it's not subject to wear out.
Fully electronic switching mode regeneration: A PFC boost stage converts mains AC into high voltage DC (like 400V) and keeps a capacitor bank charged (thus being tolerant to brownouts). Then, a high voltage class D amplifier turns back the DC into AC (either into a pure sinewave or into the desired waveform). This is a really high tech method. |
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| yusuf |
Thanks Eva. I am aware of all options but CVT or servo option does not fir my budget.
I am looking for reference design, can anyone point me please. |
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| AndrewT |
Hi,
computer UPS are available at knock down prices now.
How about picking one with a large output VA and use this to run the system?
They actively monitor for both over voltage and under voltage as well as total loss of power.
You may not need the total loss of power option and this will save on battery size, but if you buy a type that monitors and corrects for voltage errors then that may stay within budget. |
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| yusuf |
Thanks Andrew. Thats a very good suggestion. I will check it out.
I still like to know any reference design for voltage stabilizer if any, so that I can connect my complete house and may work out cheaper.
Yusuf |
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| gmphadte |
The cheap UPS mostly outputs square waves instead of the sine waves. Connecting the square wave output to an SMPS equipment does not create any problem but never connect them to a primary of a transformer.
One of my friend (surgeon with tech liking) connected his Denon amp to the UPS and the amp torroidal transformer overheated and the amp went dead. Lucky it had a thermal fuse inside the potting but was very difficult to fix.
U would be better off buying cheap servo stabilizer from second hand bazaar or some place alike.
There is one more solution.
This is for the equipment with universal mains supply rating. 100volts to 240volts
Using an auto-tarnsformer, just step down the supply a little so that the high mains supply does not cross the highest supply rating of the syatem.
Gajanan Phadte |
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