with no battery

with no battery?

Yes, with no battery.

 

The UPS inverter circuit will maintain a clean non distorted AC waveform at 120vac with an lower AC input or low battery DC input.

 

If the switching point is designed to be close to 115 volts, why do the UPS devices keep working with no battery when the AC power line is as low as 90 volts?

 

If the switching point is designed to be close to 115 volts, why do the UPS devices keep working with no battery when the AC power line is as low as 90 volts?

The inverter has buckboosting or amplification. It's job is to maintain a clean non distorted AC waveform at 120VAC

 

So all UPS power supplies everywhere have this buck-boost feature?

 

So all UPS power supplies everywhere have this buck-boost feature?

No all commercial ones , but mostly industrial ones should have this feature

 

Do they all have the same amount of ripple voltage on their capacitors when you adjust the input voltage down to 90 volts AC?

 

Do they all have the same amount of ripple voltage on their capacitors when you adjust the input voltage down to 90 volts AC?

I'm not sure, but i know the inverter converts AC 115vac with whatever ripple percentage into DC and then back into a clean non distorted AC 120vac sinewaveform with No ripple

 

What is their output when the power line voltage is 80 VAC and they have no battery?

 

What is their output when the power line voltage is 80 VAC and they have no battery?

No, they shut off or the invert circuit IGBT transistors blow up often

 

I tire of this game. Why don't you post a new thread with 15 questions at once, all about circuits without any schematics, brand names, model numbers, or even type of equipment they are in?
Oh...you already did.

 

Correct, the formula needs to be changed to be able to calculate for Improper operating conditions like if the AC line voltage goes under to 80VAC , what is the ripple and how do I calculate it?

You can't determine at what input voltage the ripple will appear at the output of the supply without knowing the design of the supply.

The point you are missing is that the ripple will appear at the output when the input ripple minimum voltage goes below the minimum operating voltage of the regulator. That can only be determined by examining the specific supply design.

 

The point you are missing is that the ripple will appear at the output when the input ripple minimum voltage goes below the minimum operating voltage of the regulator.

So the regulator sets the % percentage of ripple or range of the ripple?

 

So the regulator sets the % percentage of ripple or range of the ripple?

That's not what I said. You have to examine the whole circuit

 

So just to be clear. Regulators don't' do anything to the ripple voltage or percentage of ripple? or does regulator clean up the ripple noise or reduce the ripple? change the ripples ratio or percentage

 

Regulators don't do anything to the ripple on their input capacitors. They perform in spite of the ripple.
@crutschow He's been told 30 or 40 times that, "it depends on the circuit" but he will not name a circuit because he wants Universal Truths about All Circuits Everywhere.

 

I'm just asking in general

 

In general, the behavior of all circuits depends on how the circuit is configured.

 

So just to be clear. Regulators don't' do anything to the ripple voltage or percentage of ripple? or does regulator clean up the ripple noise or reduce the ripple? change the ripples ratio or percentage

No, that's not we said either (I hope you're not as dense as you appear).
A regulator, depending upon its design will normally reduce the ripple from the input rectifier filter (and here's where I shout) if it's operating within its design limits.

 

but what if is not within it's design limits? What happens then?

At this point the original thread starter is invited to perform an experiment and FIND OUT for himself what happens. The only we will know the answer is if he comes back here and posts up the results of his experiment.