Inverter--Modified Sine Wave

I just bought a Whistler inverter for use in my car, rated at 200 watts. The manual for the inverter says that "The AC output is called 'modified sine wave'"; it also says "Check with the appliance manufacturer for compatiblity with sine wave inverters if you're unsure." So, will the Mac's power supply work with an inverter producing a "modified sine wave"?

no problemo I say. My home power is run by an ancient Trace modified-sine 2012 inverter (off the grid). I also have a cheapo 300 w inverter in my car, very useful for miscellaneous charging. "Modified sine" just means the tops are not peaking like in true sine-wave inverters or grid power, with peaks @185v (rms, averaging 117-120v AC). The peaks (@60 hz) for "modifid sine" are stepped-topped at like 164v); valleys are likewise @ like 80v, too, so rms average is still 120v (over time). It is true that inductive loads, like battery charging, suck up peaks first. So one would think that modified sine would be bad. But they are fine! The magSafe battery charger is a huge cushion between basically any kind of AC power: browned-out 3rd-world legs or whatever, within specs, which are 50 - 60 hz, 110 - whatever volts. Modified, even square-topped sine wave is ok. That type of ac power may run clocks and turntables funny, by they are fine for charging a MBP IMHO.

Similar Messages

Modified sine wave inverter to power MyRio?

Helllo
I am going into uncharted territory for my senior design project. I need to build an MPPT circuit to efficiently charge a 55AH or 75AH battery.
The design because of my lack of programming expertise is going to for the moment be based off of the MyRio. Unlike most controllers I've seen, the Rio needs a DC power supply to function so I need to be able to plug its AC/DC adapter to an inverter which would be connected to the battery
I went to my car today with this inverter: http://www.rosewill.com/products/1738/ProductDetail_Specifications.htm http://www.rosewill.com/products/1738/ProductDetail_Specifications.htm
I didnt seem to have any problems with my ThinkPad Yoga charging on it and the myRio plugged into it. that being said, I only intend to run stuff off this inverter for at most 3-4 monthswhich is the duration of the project.
Is there a big risk of frying my components? Also would using such a source introduce too much noise. I would buy a proper sinewave but those things are very expensive.
(note most of my work will be done in a lab or at home with utility AC). I will test the circuit prbly for 120 hours at most on the battery/solar setup which includes demo purposes.

Edo101,
I doubt you will damage the myRIO by using a modified sine wave inverter. You may see some additional noise on analog inputs and outputs, but unless you need a very high level of accuracy, I doubt that would be too much of an issue either.
Kyle T.
Applications Engineering
National Instruments

Can Mac Pro run off a modified sine wave inverter safely?

I was looking into getting a car inverter for an upcoming road trip.
The posts that I was reading said a pure sine wave inverter was the best. Unfortunately the cost is really up there. A modified sine wave inverter is about a 1/4th of the cost. Some blogs mentioned the modified version works with newer computers, however they were not specific.
Needing some nerdy help!

If you are producing 110 volts to supply the computer's AC adaptor, then it should be OK.
I would verify with the inverter's manufacturer that it is suitable for use with computers and their power adaptors. Also, be sure the inverter provides adequate power.

Will the Ipad power adapter operate safely from the modified sine-wave output from a 12VDC-240VAC inverter?

Will the power adapter for the Ipad Air operate safely on the modified sine-wave output from a 12 VDC-240VAC inverter?

I am not sure why you want to do that...the power adapter takes 100-240 volts AC at 50-60 Hz and converts that to 5 to 5.1 volts DC at about 2 amps. Why are you inverting 12 VDC to 240 VAC then back to 5 VDC?
It should handle that easily, but seems like a long round about way of getting there.

Does iPhone work with modified sine wave inverter?

Well, i have a modified sine wave inverter and i want to know of i can use this inverter to charge my iPhone. Thanks!

You mean to plug the wall charger into? It should be OK, but if you are using a 12 volt auto source you are much better off getting a 12V USB charger. Wastes less gas.

T7900 and a Modified SINE Wave Inverter

Just a quick question...
All I will be powering is the sub - Not the sat's !
Can I use the Inspire T7900's on a Modified SINE Wave Inverter ?
Would a 50W (450W Peak) Inverter be enough ?
I would be led to believe that I can, but I would like to make sure first.
Thanks lads,
Ferret !
Message Edited by Ferret86 on 01-15-2007 10:51 PM

Well what i'm "trying" to do is see about putting my T7900 sub into my car, for abit of bass...
I would buy a sub for the car, but it's pointless because I wouldn't use it that often, only when i'm doing long distances which isn't very often.
If the sub works off the Modified SINE Wave inverter, then all I have to research is how to connect the headunit to the sub itself !

How to modify Sine Pattern or Wave VI so that an offset can be applied to it.

Hello,
Is it possible to modify a the Sine pattern.vi or sine wave.VI so that a voltage offset can be applied to them?
If not, any ideas on how to build a VI that outputs an array with a sinusoidal pattern which can then be written to a channel?
Suggestions for other options are definitely welcome.
Thanks!
Solved!
Go to Solution.

That is simple enough.
Just think of it from a mathmatical point of view. If you have:
y = sin(x)
and you want to 'offset' the y-value, then you just:
y = sin(x) + 'offset'
I added a constant of 5, but you can change that to a numeric control if you want
Cory K

How to restart after being connected to a non-pure sine wave inverter?

I took my MacBook Pro to the motor home last night and set it up for a trip today. I forgot the computer was on and I plugged it in.. While traveling today it was on the inverter power which is not a pure sine wave inverter. Tonight the computer opens but I can't activate anything with the mouse and when I try the little color wheel starts spinning. I have also tried starting in safe mode by holding down the shift key while starting and I get the same result. I don't know what else to do and I am hoping I haven't fried something!
Stu

Have you tried the basics, SMC and PRAM resets?
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/ht1379
Ciao.

How to measure time difference between zero crossing of a sine wave and rise time of a pulse on a same graph?

I have a 50Hz sine wave and a pulse signal on a same graph. The phase difference between two is between 0-90 degrees.
Now I need to calculate the time difference between (when the sine wave crosses zero volts) and (when the pulse rises). The frequency will stay approximately same for both signals.
The application is for a three phase generator. In simple words, when the time difference between the zero-crossing of sine wave and the pulse rises increases, that means that the load on the generator has increases.
I am a beginner user of LabView (version 9, 2009), maybe it is a very simple problem but I've been pulling my hair out for the last few days and coudln't figure anything out. Any help would be greatly appreciated. I am using DAQ USB-6008 to measure these voltages and pulse from the generator and a sensor
I have attached a jpg (a graph that i just made with excel to explain). The time 't' is what I am trying to measure
Cheers
Awais
Message Edited by awais.h on 03-30-2010 11:20 PM
Message Edited by awais.h on 03-30-2010 11:21 PM
Solved!
Go to Solution.

Hi
Thanks for the code but I'm afraid it won't work. Like you said the probability of choosing a value that is on both graphs may not happen. This is something that I would like the code to do automatically.
But I did use the previous code posted and made some modifications to it and it seems to work perfectly. Now the next thing is to be able to get just that one value that tells you the first time difference.
Here is what I get using that code.
As you can see from the t Values. I only need the one that is highlighted. If there is a way to filter out the rest it would be great.
I was thinking of a while loop and as soon as the value is higher than 3E-5 it would store the number and stop the loop, but I'm not too familiar with arrays in labview.
Here is the the code modified.
As you can see, it wasn't that big of a modification and it still is your code.
I will keep trying.
Thanks for the help
Attachments:
FinalShockSpeed.vi ‏55 KB

How to change the phase by 90 deg of a sine wave

Hi
Does any one know how to change the phase of a sine wave by 90 degrees.
Mal

Hi Malkoba,
Thank you for your post.
Having looked at your VI I can say that you have created the correct inputs to the 'Sine Waveform.vi'.
However the dial you had created had no affect as it was not wired into it the 'Sine Waveform.vi' on the block diagram.To fix the problem I have wired the 'Phase' dial into the 'phase' terminal of the waveform generator. This now changes the phase of the sine wave during runtime.
The dial also now has a digital display (numeric box below it)- this can be used to read the dial's value, or feed in specific values into the control.
Please find a modified version of your VI below.
Regards,
Field Sales Engineer | National Instruments | UK & Ireland
Attachments:
NI_phase shift sine.vi ‏31 KB

Sin wave generation for R series FPGA

Dear All,
I am generating sin Wave with (FPGA Sin Wave Generation Express vi) from Rseries FPGA Target.Frequency range is from 1500Hz to 3000Hz.Frequency and Amplitude parameters are coming from Host .Wave is going to an AO.The wave is not displaying in my Host with the set parameters as required.
What am I doing wrong??
Certified LabVIEW Architect
Certified TestStand Developer

Hi,
I am using NI 9263 4x AO.the problem was with the FPGA Express vi Parameters used the example sin wave Generation from the FPGA fundamental folder and modified the Host parameters to meet our requirement and it worked fine.
Thanks
Certified LabVIEW Architect
Certified TestStand Developer

How to generate 3 phase sine wave to output on ELVIS

Hi .I need to make a star or delta connected circuit on ELVIS board.2 make this circuit I need 3 wave generator( with 120 phase shift) and one common ground
and because the ELVIS function generator can only generate one wave I decided to generate countionuos sine wave in Labview.
Now I can generate 2 continuis sine wave in labview and output them on the analog outputs of ELVIS.Ao-0 and A0-1
but I dont know what to do for the third signal.the elvis board just has 2 analouge output and when I use Ao-0 and A0-1 I cant use ELVIS function generator after that.so would u please help me on this problem.how can I output 3 contious sine wave in Elvis.I have attached my VI to this post
Attachments:
new.vi ‏38 KB

Hi, I am also having some problem in generating two signals from two AO. Could you please tell me how to generate two different signals from two AO. I have attached vi which generate square wave from one AO 0. I need the inverted signal in AO 1.
Attachments:
Pulse Width Modulation.vi ‏48 KB

Générer une implusion avec "Sine Wave Generator" en FPGA

Bonjour,
Content de vous rejoindre sur ce forum. Tout nouveau en Labview (pas très à l'aise avec certaines notions), je voudrai soliciter votre aide. En fait, je veux créer une impulsion de 100Hz avec la fonction " Sine Wave Generator" de FPGA. En simulation j'ai réussi mais dès que je compile en target il m'affiche ce message : "Top-level clock rate does not match rate for which the Sine Wave Generator VI was configured. Reconfigure the Sine Wave Generator or the top-level clock so that their rates match. You also might need to modify computed values for the frequency (cycles/tick) input."
Je change donc FPGA clock rate et je choisis 40MHz (la seule qu'il me propose). Mais dans ce cas, je me perds pour retouver mon impulsion (qui doit durer une période 0.01sec). J'ai essayé de jouer sur le nombre d'échantillons en changeant le nombre d'itérations de la boucle For afin de générer toujours une période ( pièces jointes) mais ça marche pas!!!
Pourriez vous m'aider à déchiffrer ce problème?
Merci d'avance
Pièces jointes :
burst sine.png ‏372 KB
burst sine_40MHz.png ‏336 KB

Bonjour M2IM,
En mode simulation, on utilise une fonctionnalité appelée "Interactive Execution" car l'exeuction/affichage ne peut être géré à une fréquence élévé (40 MHz dans le cas de la Top Level Clock par défaut).
En mode FPGA target, la vitesse est plus élevé et donc uniquement certains points du sinus seront afficher mais le signal electrique lui sera bien un sinus.
Je t'invite à regarder le lien ci-dessous qui reprend quasiment la problématique que tu rencontres:
Generate a sine with LabView FPGA and connect it to an AOModule
Bonne journée,
Valentin
Certified TestStand Architect
Certified LabVIEW Developer
National Instruments France
#adMrkt{text-align: center;font-size:11px; font-weight: bold;} #adMrkt a {text-decoration: none;} #adMrkt a:hover{font-size: 9px;} #adMrkt a span{display: none;} #adMrkt a:hover span{display: block;}
Travaux Pratiques d'initiation à LabVIEW et à la mesure
Du 2 au 23 octobre, partout en France

Simultaneous updation of sine wave using 2 PXI-6711 cards using RTSI Trigger

Hi ,
How to generate continuous sine wave using two pxi-6711 cards at same time without any phase shift using traditional nidaq functions.
Regards,
satya

In LabVIEW, go to Help>>Find Examples. Navigate to Hardware Input and Output>>Traditional DAQ>>Multiple Device. There is an example there called "Two E Series Shared Scan Clock". That example is for analog input, but you should be able to modify it to be for analog output. Basically you will just have to share the scan clock from one board(master) and use it as an 'external' clock for the other board(slave).
-Alan A.

USB-6009 Sine Wave

Hi,
I am new to LabView and am having some trouble. I need to input two sine waves into a USB-6009. I have a voltmeter that should read the output. Two of the problems that I have had thus far: I can only use "On Demand" in DAQ Assistant and even when I throw the DAQ Assistant into a while loop I still do not get a readout on my voltmeter. Any suggestions? Thanks for the help.

That is confusing. You say you need to input 2 sine waves into a 6009 and that to me implies that you are doing a DAQmx Read. Then you say you have a voltmeter to read the output. That implies you are doing a DAQmx Write. If you are really doing a write from the 6009, then on demand is, of course your only choice. As the specs clearly indicate, the output of the 6009 is strictly software timed so you would need to pass a sine wave point by point and then you would have very little control over the frequency. And, again as the specs clearly state, the fastest output rate you could expect is 150Samples/sec.

Inverter--Modified Sine Wave

Similar Messages

Maybe you are looking for