All About Circuits Forum  

Go Back   All About Circuits Forum > Electronics Forums > Homework Help


Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

Reply   Post New Thread
Thread Tools Display Modes
Old 03-08-2007, 06:15 PM
menotu3169 menotu3169 is offline
New Member
Join Date: Mar 2007
Posts: 3
Default PWM 12Vdc to 120Vac inverter

Hi, new to the forum, and trying to find a little help

For one of my college courses, I'm trying to build a 12Vdc to 120 Vac inverter. The same kind of thing that you plug into the cigarette lighter of your car to power your TV, or whatever. My professor told me that the best way would be to use a PWM. It doesn't have to have a lot of power, I'll be happy with anything really.

Anyway . . .on to the help part: I have no idea where to start.

I know I need a PWM(obviously), and I figure that from there I use an integrator to get the SineWave output. Thats about as much as I know.

If anyone can guide me in the right direction, provide a Block diagram or a full-blown schematic, it would be greatly appreciated.

On a side note: I bought a cheap inverter from . . .somewhere(i forget at the moment), and took it apart to try to backwards engineer it. When I got inside I found an IC, that I have yet to identify. If anyone can help me there, it would also be greatly appreciated.

It was a
Reply With Quote
Old 03-09-2007, 08:27 PM
menotu3169 menotu3169 is offline
New Member
Join Date: Mar 2007
Posts: 3

Alright, I've been working on this for the past few days, and I was just wondering if someone could tell me if I'm at least heading in the right direction

I figure, that if I have a Mosfet(or some other switch) in series with a Capacitor, connected across a 12 Vdc source, with a PWM controlling the Mosfet, I should be able to get an approximation of a 12 V sine wave. If I use a 1:10 transformer, I should be able to get it up to 120.

My problem now is, will I be able to get any sort of Power out of a setup like this?

I tried setting up a PSPICE simulation, but I couldn't get it to work. I'd protoboard it myself, but don't have the time.
Reply With Quote
Old 03-09-2007, 10:16 PM
wongkenji wongkenji is offline
Junior Member
Join Date: Mar 2007
Posts: 21

You will most probably need a Space Vector PWM, I'm having the same problem as you. I'm also dealing with an inverter and I need to design a SVPWM in Simulink but I still have no idea how to. So, if anyone out there has any ideas to share that'll be great.

(P.S. Do you happen to know a lot about inverters?)
Reply With Quote
Reply   Post New Thread

, , ,

Related Site Pages
Section Title
Worksheet Signal modulation
Textbook Pulse Width Modulation : Dc Motor Drives

Similar Threads
Thread Thread Starter Forum Replies Last Post
PWM inverter matlab code/simulink Programmer's Corner 4 06-04-2012 08:04 PM
help: simulation Z-source inverter with PWM mhaskari The Projects Forum 6 04-22-2012 05:21 PM
Simple 12vdc led flex strip power from 120vac? playfair The Projects Forum 7 04-17-2011 07:39 PM
dc- ac pwm inverter Rotex The Projects Forum 1 01-25-2010 07:37 AM
Single Phase Inverter (NO PWM Triggering ) spikoi General Electronics Chat 2 05-20-2009 04:47 PM

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT. The time now is 11:45 AM.

User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.