220V Voltage Stabilizer for home theter

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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.
 
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.
 
Beware of UPS giving square waves...

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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