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From: email@example.com (Bob Wilson)
Subject: Re: How to construct PWM pure sine wave inverter ?
Date: Wed, 16 Oct 2002 03:06:58 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
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
>layout please share it to me by send to my email
>(email@example.com) and also include the list of component that
>will be needed in the circuit. Iwant this inverter have specification
>as follows :
>+) Inpur DC with voltage 12 volts
>+) Output power 450 watts or 700 VA
>+) Output pure sine wave AC with voltage and frequency ca be adjusted
>in range :
> -) AC voltage range : 100 - 250 volts
> -) AC frequency : 30 - 80 Hz
> For yours goodness, i say thanks
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.
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