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DC to AC inverter for pure sine wave

 
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hendi
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PostPosted: Fri Jun 27, 2008 1:10 pm    Post subject: DC to AC inverter for pure sine wave Reply with quote

is anyone can help?...
is there any dc to ac converter (12Vdc to 220-240Vac) schema that produces 500W pure sine wave?

thanks in advance
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Jun 30, 2008 8:08 am    Post subject: Reply with quote

Inverters delivering sine wave are fairly cheap today, so i don't think it is a very economic DIY project.

A good place for finding schematics is to look at the application notes at some power semiconductor manufacturer's websites. I.e. Fairchild, Intersil, Texas Instruments.
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hendi
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PostPosted: Mon Jul 07, 2008 2:54 am    Post subject: DC to AC inverter for pure sine wave Reply with quote

thanks for your advice.
I've searched at local shop and found out that the inverter can not be used for driving a motor load. why?
I'm looking the inverter just because I have an ac motor where I want to give the power from acid battery not from ac power.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Jul 07, 2008 6:50 am    Post subject: Reply with quote

Usually, it should not be a problem connecting a motor to an inverter. Maybe that particular inverter design has problems with voltage or frequency regulation when connecting a "live" load as a motor with inertia to it, or maybe it cannot supply the high inrush current needed by some kinds of motors.

What kind of motor is it? A commutator (universal) motor or an induction motor? Does it have any speed control or soft start facilities? What is the motor to be used for?
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hendi
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PostPosted: Sat Jul 12, 2008 6:05 am    Post subject: Reply with quote

I've look at the inverter that it produces a suitable frequency (50Hz) to the motor. I'm not sure what kind of the motor, maybe a universal one. It doesn't have speed control. It is used to drive some gears making any seed (paper) to be a powder like.

one more thing. is the modified sine wave = sine wave? is that ok to drive ac motor?
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Jul 14, 2008 12:58 pm    Post subject: Reply with quote

When inverter vendors talk about "modified sine wave", they usually mean a staircase wave. Most motors should be able to run fairly well on a such voltage, perhaps they make somewhat more noise or operate with somewhat lower efficiency than on a pure sine wave.
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power



Joined: 11 Jul 2008
Posts: 4

PostPosted: Tue Jul 15, 2008 8:51 am    Post subject: Reply with quote

Hi Torbjorn,

Your comments has really helped me. thanks!
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hendi
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PostPosted: Thu Jul 17, 2008 6:20 am    Post subject: Reply with quote

I will find the pure sine wave since I will use it for a long time. The price is quite significant different between them.

Thanks torbjorn.
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John_audson



Joined: 11 Aug 2008
Posts: 2

PostPosted: Mon Aug 11, 2008 5:38 am    Post subject: Reply with quote

Hi Torbjorn,

Thanks for sharing this information.
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