CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@kashmirihasan • 12 Jul, 2013
How to make a pure sine wave ups ??? any circuit diagram? and what is the difference between a pure sine wave ups and modified sine wave?
@kashmirihasan • 13 Jul, 2013 anyone here?
@Jeffrey Arulraj • 13 Jul, 2013 Hey man Sine wave got from inverters can't be 100% pure

But one solution I can think of is using a VCO tuned to the same frequency of the output of inverter and thus we get nearly smooth sine wave

PS:But why do you need 100% pure sine wave
@kashmirihasan • 13 Jul, 2013 so u are saying 100 % pure sine wave doesnt exist?
@kashmirihasan • 13 Jul, 2013 i need pure sine wave for my computer
@Jeffrey Arulraj • 14 Jul, 2013
kashmirihasan
i need pure sine wave for my computer
Your computer is designed to work in a wide range of voltage and fixed 50 Hz or 60 Hz frequency

This signal doesnot neccessarily be sine wave it can easily work if the input is a square wave as well

In general if your system has SMPS the input signal is immediately converted into DC for utilisation so the signal you are using has less importance
@Cyborg 009 • 15 Jul, 2013 MY BE project SOLAR MPPT SINE WAVE INVERTER ...
@Cyborg 009 • 15 Jul, 2013 No need for pure sine in smps devices which use rectifiers in first stage ..
all ur hard work of creating sine wave goes down the drain when it converted to dc ..
CFL's & computers work well at 230V Dc ..
@Jeffrey Arulraj • 15 Jul, 2013
Cyborg 009
No need for pure sine in smps devices which use rectifiers in first stage ..
all ur hard work of creating sine wave goes down the drain when it converted to dc ..
CFL's & computers work well at 230V Dc ..
Not 230 V DC friend

That will be 230 V AC equivalent DC voltage Which is 230/(2)^1/2
@Cyborg 009 • 15 Jul, 2013 230V from mains is rms voltage ...Vpeak = 325V
230Vrms AC= 230V DC
@kashmirihasan • 15 Jul, 2013 my power supply got burnt bcz i used modified sine wave inverter. my friend told me to use pure sine wave ups.
@Cyborg 009 • 15 Jul, 2013 you made the inverter ???
in mod sine the o/p sits at zero for sometime to resemble sine wave ..
@kashmirihasan • 15 Jul, 2013 nope inverter was built by my friend. but he told me it was modified sine wave and sensitive devices like computer get burnt out becz of modified sine wave ...bcz in an inverter u can never have pure sine wave with a chopper
@Cyborg 009 • 17 Jul, 2013 some info on pwm inverter..
https://www.electroschematics.com/5865/pwm-inverter/

First step to produce 325V dc from 12v dc .It can be done using a push-pull dc dc converter.. O/P can be adjusted to 230VDC & can be diredtly used to power SMPS circuits ..
https://danyk.cz/dcdc_en.html

2nd step to provide sinusoidal PWM signals to H bridge powered by 325v DC ..
then the o/p of bridge is filtered to get 230V AC pure sine ..@ 1-5% THD
I used atmega16 & sine lookup table to produce the required pwm signals .
@arunvtkl • 18 Feb, 2014 100% pure sine wave inverter using pic 16F628A chip
https://www.instructables.com/id/Adaptable-24vDC220vAC-Pure-Sinewave-Inverter-1/
@manojCC • 01 Mar, 2014 after all you need to convert a sine wave ups into Dc at the end...why you wand to go around a bush when you have clear path to walk..
@Jeffrey Arulraj • 04 Mar, 2014
manojCC
after all you need to convert a sine wave ups into Dc at the end...why you wand to go around a bush when you have clear path to walk..
Well I don't agree with this term in all practical scenario. Some circuits need AC and so we need invertors to boost them up don't you think that they als need some justice done to them

Pure Sine wave circuits is not practically feasible Noises will be there nearly 99% pure is an apt word for describing the output of pic
@a.alandkar • 07 Mar, 2014 • 1 like 100% pure sine wave can be generated. Here are some steps to achieve it.
1. get sine(50Hz) weighted PWM with a carrier of 2-3KHz as per ur convenience
2. get them inverted.
3. now by using digital logic make 4 pulses of those 2 pulse.
4. get all the 4 pulses isolated and use them to fire IGBT/MOSFETs.
5. The resultant o/p will be sine wave. You can verify it by using R-C or L-C at the o/p stage.
@vamsi kancharla • 04 May, 2014
kashmirihasan
How to make a pure sine wave ups ??? any circuit diagram? and what is the difference between a pure sine wave ups and modified sine wave?
pure sine wave(98%) inverters/ups are available in the markets to buy then why to design that to for computers time consuming task
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