Seek reliable 12 VDC to 230 VAC 90 watt inverter schematic.

evalon · Jan 15, 2011

Hi,

I'm looking for a reliable 12 VDC to 230 VAC inverter schematic capable of delivering 90 watts. Need be low weight, high efficiency and preferably a sinewave inverter or close to a sinewave. Also, I cannot program devices or work with pic's so a simple analog design is preferred.

I have searched the forum but didn't find such a design so hope one of you knows of such a schematic ...

Greetings,

Jesper

kabiru · Jan 15, 2011

Well if you dont want to use micro's,then you can only get modified sine output.

Tahmid · Jan 15, 2011

Hi,
I don't have a complete schematic, but since you want low-weight and high efficiency, SMPS would be a good choice.

Here's an idea:

Check here for some ideas including a posted circuit:https://www.edaboard.com/threads/193437/

Circuit posted in that topic:

51113d1290892317-12v-220v-invertor-sinus-ferit-trafo-nuve-gif

Hope this helps.
Tahmid.

---------- Post added at 23:19 ---------- Previous post was at 23:18 ----------

It's not sine but quasi-sine.

Sine would be best with microcontroller, but here is one without microcontroller, using op-amps.

https://www.wpi.edu/Pubs/E-project/Available/E-project-042507-092653/unrestricted/MQP_D_1_2.pdf

Hope this helps.
Tahmid.

evalon · Jan 15, 2011

Hi Tahmid & kabiru,

- thanks for reading & replying.

@Tahmid: It looks quite impressive the circuitry you have attached :wink: However, it made me realize that what I'm hoping to find is an IC that has everything except for a few external components (like FETs or IGBTs).

Any of you knows of such an IC ( ~12 VDC to 230 VAC at ~90 watts)?

Greetings,

Jesper

kabiru · Jan 15, 2011

evalon said:
Hi Tahmid & kabiru,

- thanks for reading & replying.

@Tahmid: It looks quite impressive the circuitry you have attached :wink: However, it made me realize that what I'm hoping to find is an IC that has everything except for a few external components (like FETs or IGBTs).

Any of you knows of such an IC ( ~12 VDC to 230 VAC at ~90 watts)?

Greetings,

Jesper

you can not get any ic's that can do everthing for you, if the above circute look to complex for you then you will have to build the one with iron core lamination,which does'nt require boost converter,it only uses low freq 50Hz but is not going to be light weight as you expect.

Tahmid · Jan 16, 2011

Hi,
If you want one IC that does everything, you have to use microcontroller. But if you use a low frequency inverter, it can be done with an SG3525 only, but it's not light-weight. However, if all you want is an inverter, without the protection schemes, the circuit can be simplified, but it's always best to include protection schemes.

Hope this helps.
Tahmid.

evalon · Jan 16, 2011

Hi Tahmid & Kabiru,

@Tahmid: Thanks for suggesting a potentially simpler solution. However, it seems that it may possibly be more complicated to build than I had imagined so I will have to leave it here and opt for buying an inverter.

But I do appreciate the effort you made to help and the suggestions you made ...

Kind regards to you,

Jesper

viknik8 · Jan 17, 2011

Here the address **broken link removed**

evalon · Jan 19, 2011

Hi Viknik8 - thanks for posting. As I mentioned in a previous post I now intend to buy an inverter, however, if your suggestion is simple I might be interested.

However, I can't unzip the file to something that I can open. Is it possible that you can post a jpeg file of the schematic?

Best regards,

Jesper

viknik8 · Jan 19, 2011

Here two circuits

kabiru · Jan 20, 2011

Here is a simple inverter circute diagram try it.

evalon · Jan 20, 2011

kabiru said:
Here is a simple inverter circute diagram try it.

Hi Kabiru & viknik8

Thanks for following up on my question!

I find your schematics to be very interesting, however, one of my main criteria is - as I wrote in my first post - low weight (as I will be using the inverter on travels) and the transformers in your schematics most likely weigh some :???:

I've found an inverter - a product for sale - which delivers 150 watts in a package that weighs 148 grams 8O . It's something like that I'm hoping to find.

Also, although I may not be using your suggestions I hope they may be of interest to other people as well ...

Greetings to you,

Jesper

evalon · Jan 29, 2011

Hello again,

@Kabiru, if you are still here: The schematic you posted with an 3524 IC do you know if it has been tested so that it works?

Greetings,

Jesper

kabiru · Jan 29, 2011

The circute is working perfectly just go ahead and start working on it,but you will need additional circute like low battery protection and overload.

evalon · Jan 29, 2011

Hi Kabiru,

Sounds interesting - I just found that I have a couple of SG3524 ICs and also some PowerFETs, and a 12 VAC/220VAC transformer so I may make it.

Just to prevent any unforeseen challenges if I do: Are there any of the components that need to be a special kind? I'm thinking e.g. of the capacitors and the FET? I don't have the IRFZ44s but instead have IXFX 90N30. Datasheet can be found here:

**broken link removed**

Do you think I can use these instead?

Greetings,

Jesper

Tahmid · Jan 29, 2011

Hi evalon,
You can use these MOSFET without any problem. The capacitors aren't anything special, just be careful about the voltage rating.

Do you by any chance have any SG3525? If so, the gate driving can be made more efficient without complicating the circuit.

Hope this helps.
Tahmid.

kabiru · Jan 30, 2011

The mosfet are ok you can use it.

evalon · Feb 6, 2011

Hi Kabiru & Tahmid,

& thanks again for replying. In the first round I have chosen to buy a couple of inverters that are lightweight - I will be using them on a bike and the transformers I have been able to find (as low as 50 watts) have weighed more than a kilo which is too much.

I will, however, have your circuit in mind for potential later use - and then also wonder why nobody appear to have designed (or made available) a circuit where a high-frequency "device" directly synthesizes a 50 Hz sinewave at 220 VAC - sort of like a variable boost converter ...

Be well & thanks again for helping

Jesper

evalon · Feb 19, 2011

Hello again,

If you, Kabiru & Tahmid are still watching this thread: I bought a couple of small inverters and have now received them. I took one of them apart and it as far as I remember it is based on two TL494 ICs.

They actually work quite fine - at least with switchmode power-supplies, however, my Weller soldering station doesn't work when powered from the inverter. It lights up but the temperature regulating circuitry does not work. I've tried to insert a vario-trafo between the inverter and the Weller solder station and it might improve things a bit but it essentially still doesn't work.

I really would appreciate a suggestion as to what can be done - preferably in a simple way (AC noise suppression filter or the like...)?

Best regards,

Jesper

kabiru · Feb 19, 2011

Hi, i am still here;since your soldering iron does'nt work with the inverter,i dont think using filter's will solve the problem because if you are trying to shape the wave more the more it consume's more current and it can make your mosfet become hot,therefore if you want to use soldering iron use the one that has no electronic control in it.

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