How to step up and step down the voltage using labview?

[fakhri]

Hi everybody..

I am looking  how to step up and step down the voltage using labview?

Can anyone give me a solution with an example?

Any help would be greatly appreciated!

Thank you...

[Dennis_Knutson]

What voltage? What hardware? If it's an NI DAQ board, you just have to open the example finder (under help) and expand Hardware Input and Output>DAQmx>Analog Generation>Voltage.

[fakhri]

I do not use DAQ.. For your knowledge,I only use 100% software program Labview for this project and not use hardware.
If I use labview programs I will be to raise the voltage
I want to increase the voltage of DC without using DAQ ..

[PJS]

where is the voltage being changed?  LabVIEW is a programming language and by itself cannot change any voltage.  In order to change a voltage, LabVIEW must interface with an external piece of hardware.  That maybe a data acquisition card (which you have already stated it is not), a power supply (that you can talk to via Ethernet, GPIB, serial or some other protocol), the parallel port for 15 bit digital input/output or something else.  OR you maybe simulating some such hardware.

In LabVIEW though, it is simply changing a number in a numeric control, the real magic in changing voltage is what happens AFTER the numeric control is changed and we can not help you if we do not understand the entire concept.  What we know right now is that you are using LabVIEW and not using a daq card.  So when you change the voltage on the LabVIEW front panel, what are you expecting to happen?  And to what?

I hope this clarifies the information that we are trying to get from you so that we may render good help

[fakhri]

For now, i've some numeric values that i had assumed it as a DC voltage. For example, i had 9.786 vdc.From that value, is it posibble for me to step up  the 9.786 vdc into 24 vdc. For you information, the results that we get is only used as a "dummy" voltage because i do not use any input/output from any hardware

My second question is there any such way to invert/convert DC-to-AC or AC--to-DC..??

[RavensFan]

I'm going to refer back to Dennis' and PJS's messages.  You still haven't told us anything.

What numeric value are you talking about?  What do you mean by step up 9.786 VDC to 24 VDC considering you said you aren't working with any hardware?

Please post whatever VI you have started so far as it might give us some visual clues as to what you are trying to do.

[Dennis_Knutson]

This is turning into a pretty frustrating thread.

fakhri,

One thing you will have to learn is how to write and read detailed specifications. You have surely encountered assignments in class that are clearly explained and unambiguous. You need to provide similar information. Without it, us volunteers here will simply stop volunteering to help you.

I suspect that you really want to do some circuit simulation and think LabVIEW is the tool for that. For simulation, you should really look at Multisim.

[fakhri]

This is my title for this project. "DEVELOPMENT OF INVERTER FOR AUTO VOLTAGE SELECTOR USING LAB VIEW APPLICATION FOR RENEWABLE ENERGY"

The purpose of this project is convert the highest selected by the DC voltage sources then come from difference renewable energy sources. The sources are considered to be wind turbine or solar energy and fuel cell. Throughout this design, it should also be able to:

1. To invert from DC output of switching to AC source voltage.

2. To step up DC voltage using Boost Chopper or step down DC voltage using Buck Chopper.

3. Develop the simulation using Lab VIEW Application.

I also attach my flow chart and VI. This is our description about this flow chart..

Flow chart shown the process and flow this project. The program start simulation regarding the command that is used in process the data by using Lab VIEW software. The systems get input voltage from switching part. The system would be set to fix voltage is 24 Vdc. If voltage input less than 24 Vdc, the system must be step up use Boost process or if the voltage input more than 24 Vdc, the system must be Step Down use Buck process. The next step is to use inverter from DC source voltage to Ac source voltage. For the time being, the basic inverter will be used to change into AC source voltage. The operation of this system are fully control by using Lab VIEW software where convert DC source to AC source.

[Dennis_Knutson]

That's much better. Unfotunately, it is way too close to a project I am doing with real hardware and which I am under a NDA so I really can't help much. I can say that if you not need to actually model the components, you can do some things pretty simply. For example, if you want an inverter that outputs say, 120VAC, you would just drop a Simulate Sine Wave function with a constant wired to the input. Modeling the actual components is much trickier and you might need to use the Mathscript node or Multisim.

[Kev1823]

I reckon this could be done relatively easily using matlab simulink....we did a similar sort of thing using simulink to develop a model for an inverter motor-driver circuit which was connected to a 3-ph motor and it's operation simulated.

I've never attempted (or sure if it's possible) to import the simulink files into labview in the same fashion as you would with the normal matlab 'm' files. So hopefully some of the nice, friendly people on here might be able to advise you further on the matter.

Just an alternative route for you to look at. 🙂

Regards,

Kevin