Author Topic: Sine Wave Inverter Using High Power Audio Amp?  (Read 1689 times)

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(unknown)

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Sine Wave Inverter Using High Power Audio Amp?
« on: April 21, 2005, 02:39:25 AM »
Good day to everyone,

Would it be possible to use a high power audio amplifier as a Sine Wave Inverter ( say from a 60 Hz sine wave signal generator, stepped up to 220 volts using an audio amplifier rated, say 500Watts).

I'll appreciate any comment on this..:)


Nonx

« Last Edit: April 21, 2005, 02:39:25 AM by (unknown) »

Tom in NH

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Re: Sine Wave Inverter Using High Power Audio Amp?
« Reply #1 on: April 20, 2005, 09:40:03 PM »
You might be interested in looking at the service manual for the Elgar 6006B ultra precision line conditioner:


http://www.elgar.com/pdfs/manuals/Elgar/Ultra%20Precision%20Line%20Conditioners%20(UPLC)%20Series/UPLC%206xxxB%20Series%20Operation%20and%20Service%20601-012-95%20Rev%20D.pdf


This unit produces an internal square wave, which it converts to a sine. Then this is used as a reference voltage, comparing it to the line voltage, amplifying any difference found using a power amplifier, in order to apply a correction to the line voltage. This strikes me as being just a couple steps away from what you propose. If the line voltage were DC or a square wave, a unit that works on a similar principle as the 6006B might convert it into a pure sine wave using a power amplifier.


BTW, these units are declared "obsolete" by Elgar, however there is one for sale on ebay right now. Don't know how well it would work to condition a square wave into a sine, but I'm going to find out soon as I have purchased one of the two that were offered. --Tom

« Last Edit: April 20, 2005, 09:40:03 PM by (unknown) »

Tom in NH

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Re: Sine Wave Inverter Using High Power Audio Amp?
« Reply #2 on: April 20, 2005, 09:43:49 PM »
Apparently the board chokes on looonnng links. Sorry 'bout that. You'll have to copy the above link and paste it into your browser. Then you can download the manual if you want it. --Tom
« Last Edit: April 20, 2005, 09:43:49 PM by (unknown) »

(unknown)

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Re: Sine Wave Inverter Using High Power Audio Amp?
« Reply #3 on: April 21, 2005, 01:50:22 AM »
Thanks Tom, I've tried http://altenergy.blog-city.com but could not found what I need.  Maybe I'm lost.  If I may re-phrase my statement, what i really like to know is, can I use a high power audio amplifier as a DC-AC power inverter?  For instance, if I have a 60 Hz sine wave generator, a 500 watts audio amplifier both of which powered by a 12 Volts car battery, a 12/220V transformer (with 12V side connected to the audio output of this audio amp), can this setup produce a usable 220V, 60Hz power source?  What other implications on audio amp operation or output signal wave form can this setup create? Thanks for feedback anyone can give me. Nonx.
« Last Edit: April 21, 2005, 01:50:22 AM by (unknown) »

drdongle

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Re: Sine Wave Inverter Using High Power Audio Amp?
« Reply #4 on: April 21, 2005, 05:45:46 AM »
The simple answer is yes, however.... most audio amps are inefficient at such a low frequency, and not designed to provide a continuous out put at one frequency for a prolonged time. I have found that the power ratings on many car audio power amps to be greatly exaggerated. I have seen amps advertised as 100 watts containing output amp chips rated for 20 watts max! Manufacturers of such equipment tend to hedge on their specs, by using power rating systems other than RMS. You can try this but I suggest that you exercise caution. Remember many AC devices when initially powered up will momentarily draw several times their name plate wattage.
« Last Edit: April 21, 2005, 05:45:46 AM by (unknown) »