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Subject: Re: How to construct PWM pure sine wave inverter ?
Date: 16 Oct 2002 17:56:11 -0500
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On Wed, 16 Oct 2002 03:06:58 -0000, email@example.com
(Bob Wilson) wrote:
>In article <firstname.lastname@example.org>,
>>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.
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