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Questions about my pwm sine inverter

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Posted by Gaetan Mailloux on March 1, 2012, 6:19 pm

I never succed with PIC programing, so I've assembled a schematic of a
simple version pwm sine inverter.

I have few SG3524 but no SG3525, and I can't find any SG3525 here around,
that why I use a SG3524 in my schematic.

I know that I won't get a very good sine at the transformer output, but
I've ad a negative feedback from the transformer output to the SG3524
input to do a better sine.

I can even use one of my big standard EI silicon steel transformer, but it
would better to bring down my SG3524 oscillation frequency to 200 hz or
300 hz, because at higher oscillation frequency the Eddy current would be
quite high in my output transformer.

At those low oscillation frequency (200 to 300 hz) the LC low pass filter
would need a big L coil, but it would be easyer to keep my SG3524 circuit
very stable.

Anyones can look at my schematic and tell me if it would work ok ?

Here is the link to my schematic image:


Thank you



Posted by j on March 1, 2012, 8:04 pm
On 3/1/2012 1:19 PM, Gaetan Mailloux wrote:


Not a clue.

Seems like a lot of trouble for an off the shelf device. The two pair of
75N06 doesn't seem like much. I'm not sure of the voltage drop across
it, but I would think you would need a lot more, for any reasonable
amount of power. Don't think of the current rating, think of the IR
loss. I know little about inverters, but quite a bit about big 12V car
amps. It just seems to me that with the cost of DC from solar, or
whatever you are generating it from being so expensive, that the
efficiency of the inverter would be important. I don't see such a
circuit as being particularly efficient, but I really don't know.


Posted by Mr A Clarke on March 1, 2012, 9:55 pm

What has this got to do with digital (PIC`s...) circuitry?
Why not just use a basic amplified and switched sine wave oscillator (using
a pair of transistors)?
Have you tried running the output through a computer simulator?
Isn`t it the Step-up Transformer that does all the work at the end of the


Ashley Clarke

Posted by amdx on March 2, 2012, 2:01 am
 On 3/1/2012 12:19 PM, Gaetan Mailloux wrote:

  I don't know, but I question the 12vac thru 100k to the 10K
feeding the XR2206. Some type of feedback, But...
  What is that about?

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