The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Subject: Re: How to construct PWM pure sine wave inverter ?
Date: 16 Oct 2002 17:56:11 -0500
X-Newsreader: Forte Agent 1.91/32.564
On Wed, 16 Oct 2002 03:06:58 -0000, firstname.lastname@example.org
(Bob Wilson) wrote:
>In article <email@example.com>,
>>I want to ask yours help in making " pure sine wave inverter" with PWM
>>(pulse width modulation) technique. If you have cicuit diagram and PCB
>If you have to ask how its done, you won't manage it even if you had a
>schematic. This is not trivial stuff!
>But here are the steps:
>1. Build a DC to DC conversion stage that takes 12 V and converts it to
>about 170V DC. Typical topologies are either Push Pull, or Clarke converter.
>2. Follow this with a PWM-based DC-AC stage that pulse width modulates an
>H-bridge at at least 25KHz. The resilt is a stepwise approximation of a
>3. Pass the output of 2. above, though an LC reconstruction filter to get a
>nearly pure sinwave (typically <2% THD).
>In the process, you will blow up many power FETs and possibly injure
>yourself in the process. The pros spend years getting good at this and even
>then there are a lot of blown up FETs before a typical inverter design is
>finalized. If you think you can do it with no prior experience, you should
>really think again.
Bob is absolutely right !
How many years and how many millions of dollars did it take for the
prosine ? And, how many FETs ? A bunch !
You'll lose a lot of smoke for sure !
You might actually be able to see a sine wave voltage waveform at
real low power though withouth too much trouble.
High current and voltage and frequency is a real bitch though.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup