CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@tech001 • 21 Aug, 2007

what is the difference between a voltage stabiliser and a UPS? are the 2 the same or do i need a seperate voltage stabiliser for the purpose of voltage stabiliztion?

@cameo • 21 Aug, 2007 Re: i need ur help

As the name implies,a stabilizer stabilises the power supply.
It always delivers a constant output voltage even whenthe input of it varies over the time.But if there is no input voltage the stabiliser will not provide any output.Used mostly at places where suddedn power failures doesnt effect much.

But the ups(uninterrupted power supply) will be able to supply the voltage even when the input power is cut off. The back up time (o/p when there is no i/p) varies according to different applications and make.Hence can be used for the purposes,where sudden power failures matters.say in th case of PC's.

if you have an ups,u might not need a separate stabiliser.
@Anil Jain • 22 Aug, 2007 Re: i need ur help

what is the difference between a voltage stabiliser and a UPS? are the 2 the same or do i need a seperate voltage stabiliser for the purpose of voltage stabiliztion?

A voltage stabilizer is an electronic device able to deliver relatively constant output voltage when input voltage and load current changes over time.

The output voltage is usually regulated using a transistor. In a parallel stabilizer the transistor is connected parallel to the stabilizer load, consuming the excess of power. This type of stabilizer is seldom used. In the more popular sequential stabilizer the transistor is connected sequentially with the stabilizer load, restricting the output current.
An uninterruptible power supply (UPS), also known as an uninterruptible power source or a battery backup is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available.

I hope this info will help...

@Ashraf HZ • 22 Aug, 2007 Re: i need ur help

Not all UPS devices have a voltage regulator function. There exists UPSs that are inexpensive but do not protect the computer from voltage spikes or stuff like that. But the more expensive ones do have it. Make sure you check before you purchase one 😉

Voltage regulator devices (sometimes called AVRs) are usually cheap anyway. Its a great investment for protection!
@Yousuf Rafi • 04 Feb, 2008 Very nicely explained
@AZFL1995 • 30 Apr, 2008 Hi, guys!
I need your help. My monitors are flickering and waving. I think this is from unstable voltage. Stabilizers are very expensive. Regular UPSes I have do not help. Will regulators or more expensive UPS help me to solve the problem?

Thank you.
AZFL 1995
@reachrkata • 01 May, 2008 Hi AZFL,

In my opinion it is very rare that monitor flickers are normally caused by voltage variations because the variations would need to be very large for this. Usually all AC devices are rated for a good range (typically 180-240V). So there are some possibilities I see -

1) There is some problem in the monitor not related to the supply - get it checked.

2) If indeed it is a voltage problem you suspect - it could be a problem because of varying mains supply (which you can easily find because any other bulb in your home would also flicker)
Otherwise it could specifically be a problem of your UPS output which you can also check with an AC mutimeter or another bulb.

The easiest way i would say is to take your monitor to your friends house and try connecting to his PC to check if its a specific problem in your house.

Hope this helps !!!

@raithrovers1 • 15 Feb, 2009 An online UPS's main purpose is to continue to supply power when the mains power has failed using a battery back up. On the smaller computer style (500va - 1kva) the back up time is to allow you to save your work in controlled manner while working on a computer and only last a matter of minutes. The waveform out of these smaller UPS's can be quasi square waves rather than sinusoidal but this very rarely causes any problems. The operation of these online UPS's mean that the normal mains is rectified into DC which charges a battery and also suppllies an inverter which turns the DC back into AC. This process means that any fluctuations on the normal mains supply will not be seen on the output as the output is an electronically generated waveform. Therefore this type of UPS can be classed as a voltage stabilizer.

A voltage stabilizer can come in many forms ranging from electronically controlled stabilizers, motorized variacs and some types of UPS can be used in a voltage stabilzer mode without batteries. The main difference is that a voltage stabilzer in nearly all circumstances will not have battery back up and therefore will not supply power when the mains supply is lost entirely. All it will do is keep it's output at a stable voltage.

Visit Calibre Power Electronics, UPS, uninterruptible power supply, home page
@ghanashyaml • 28 Jul, 2011 I know this is an old thread but I am still posting my answer.

In my case I do have a spikes suppressor (or spike guard), I do have waves in different resolutions and I use the resolution (1100+ x 768, do not exactly remember) which has the minimum waves. Mine is a Samsung monitor and I got it checked via their technician who came in replaced some components without success and concluded that it will need to be taken to their labs for testing. I did that and later on they called me to show that my monitor was working perfectly fine in all the resolutions and they told me that it might be the case of a faulty motherboard that might be causing the waves.

I have left it that since I did not want to replace the motherboard 😉 at that point.

So test your monitor with another system as well.
@Avishkar Gote • 08 Aug, 2011 Sometime flickering problem is not associated with voltage problem. I think you should check your screen resolution. If it is high make it low. Go in the properties and check out screen resolution there. 😎
@M.DORAI • 17 Mar, 2015 I purchased an HP All in one Computer with inbuilt CPU( Model Name: OMNI 120-1111 IN AIO) 2 years back. About 6 months back while I was working on the computer, there was a power cut and before I proceeded to switch off the power supply, the power came suddenly and my computer did not start. There was no display only the fan was running. I handed over my computer to HP authorised Service Centre M/s.Redington India(Ensure Support Service), Infantry Road, Bangalore. After taking almost 15 days to diagnose the problem,they charged around Rs.4000/- stating that BGA Chip had to be replaced. Again a month back same problem occurred after power cut and sudden power supply. This time they took 25 days to diagnose the problem and charged Rs.6013/-stating that they had to replace both BGA Chip and I.C. and also suggested me that the same problem may occur again in case of power cut and I should use a stabilizer. I paid Rs.30,000 for the Computer at the time of purchase and have spent more than Rs.10,000/- towards repair due to power fluctuation. I feel the company which manufacture the product and sells at such a huge price should have common sense to instal an inbuilt stabilizer to protect the computer from power fluctuation or atleast they should have warned not to use the computer without a UPS/Voltage Stabilizer. Can any one suggest what type of stabilizer I have to use?
@RRITESH • 07 Apr, 2015 • 1 like Hello,
The stabilizer only control line voltage for a electronic Device!
But UPS is used for DC to AC with SINwave now days, in past there was square wave which has lots of disadvantages!
@Dennis Jay • 24 May, 2015 Raithrovers1 wrote: "The operation of these online UPS's mean that the normal mains is rectified into DC which charges a battery and also suppllies an inverter which turns the DC back into AC. This process means that any fluctuations on the normal mains supply will not be seen on the output as the output is an electronically generated waveform. Therefore this type of UPS can be classed as a voltage stabilizer.".

My question is when there is power coming from the main and therefore the power is just "CIMING THROUGH" without passing through the battery as when there is a power interruption, does the UPS still actas a voltage stablizer? Great post by the way, Thanks

@msajaa • 24 May, 2015 The Voltage Regulator. Basically, it is a chip that is set to take a range of voltages in, and put a fixed, regulated voltage out.It provides the cleanest of clean power to sensitive equipment, like Tube Amps, medical equipment, and specialized instrumentation.
A UPS, or uninterrupted power supply is a surge protector fitted with a battery, so when the power cuts out, your equipment starts to draw power from this battery until the power is restored. These also include a surge protector, GFCI, and sometimes a VR.
@Dennis Jay • 27 May, 2015 Thanks msajaa. My understanding is that in the case of an UPS, during a power outage that the battery takes over and via an inverter converts from stored DC to AC thereby gives a very stable current. My query is what happens when there is power from the wall plug and so the UPS is acting as a pass-through or merely as a conduit of the power from the wall plug without passing through the battery (as in AC to DC back to AC). How then does an UPS function also (secondarily) as a line stabilizer as Raithrovers1 wrote?
Thanks for your patience.
@Detectiverd • 24 Jun, 2017 • 1 like I know this is a very old Thread but I'm posting my question anyways. If I am using a UPS, Voltage Stabilizer for my PS4. Which order should I connect them? UPS=Voltage Stabilizer= PS4 or
Voltage Stabilizer=UPS=PS4?

Appreciate all answers!
@Ramani Aswath • 08 Jan, 2020 • 1 like

The voltage stabiliser has to be located just before the load it is supposed to supply. If it is placed before the UPS all that is achieved is to provide a stabilised supply to the UPS. The stabiliser cannot regulate the output of the UPS.

@Divisha Madupalli • 08 Jan, 2020 • 2 likes

A UPS (Uninterruptible Power Supply),  is mainly used for backing up power. When the power fails or goes out of tolerance the UPS will switch to battery and maintains the req power to the load. It gives a short span of time to the system to run on the UPS when the main power goes off so we can complete the tasks like saving the work and etc.

 A voltage stabilizer is a device to keep the voltage to your equipment at a correct level. It is useful when a sudden voltage occurs like after a power cut when the device is back to work then the voltage stabilizer stabilizes so that the device is not harmed and equalizes it.                                                                                It is kept at the start of the device.

@Kavya Burramolla • 10 Jan, 2020 • 2 likes

Voltage stabiliser is a electronic device,  generally used to maintain the stable voltage levels. For example if the voltage drawn goes around 210V then voltage stabiliser with help of set up transformer stabilises the voltage to the required level that is 230V. Similarly the case with 240V during 240V, voltage stabiliser with help of set down transformer brings down or stabilises the voltage to 230V.

While UPS(Uninterrupted power supply) also provides the same feature as of voltage stabiliser when power is on. Difference comes when power is off. Voltage stabiliser will not provide any output when power is off but the UPS provides the stable output when in case of switch off. Based on the battery capacity UPS will provide the output. 


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