dc/ac inverter with SG3525 with pure sine wave output

[john120]

how can I have that circuit which gives sine wave output with stable voltage using sg3525

 

[tpetar]

You mean like this:



If You need PCB and other things say.

 

[john120]

Thank you very much for this schematic.have you tried it?
what is +315V means?
haw can I implement it in order to charge the battery(ac/dc) in the case there is main power and then dc/ac converter in case there is no main power (main electrical network from providers ).

thank youvery much.

give me that PCB,I need it.

 

[tpetar]

Send me Your email I will send You some complete circuit solutions.

---------- Post added at 17:53 ---------- Previous post was at 17:16 ----------

Email with attachments is on the way.

 

[john120]

Is it possible that i can receive it in few minutes?

 

[tpetar]

Is it possible that i can receive it in few minutes?

Yes this depend from server load pressure.

I just send You another email with other projects. Inside You will find inverters even for 3KW.




I hope so that Your batteries are very brave. :wink:

---------- Post added at 18:13 ---------- Previous post was at 17:57 ----------

Consider that standard freq trafo 50Hz for higher power have few kilos for 200-300W, and price is in my country about 30-40eur.
In the market store You have to buy new switcher inverter weight about 1kg and price 30-40eur (500W).
Pay atention on nominal standby current when inverter is attached to battery and no load is present. (200-300W about 0,3A-0,6A).
Also consider that some inteligent inverter can regulate output voltage based and coorelated to consuption power, and lots of standard inverter cannot do this. If battery voltage go low, and on load voltage go low, voltage on output also will be lower not 220V.
Pay attention on sine form: pure sine, modified, square, based on load motors, trafo,... (inductive or resistance)

Correctly calc and make choice for battery banks, or batteries go to heaven.

Prepare desulfatisator devices (lead acid).

Switcher Inverter example:

 

[john120]

yes thank you I saw your shcematic ,now I want the one i can use for charging the battery in case there is a main power ,and then works also as dc/ac inverter in the case the main power is lost.

Thanks!!

 

[tpetar]

Look at UPS circuits what I send to You.

If You need individual inteligent chargers say.

 

[john120]

I do not need individual charger circuits but,I am realizing a dc/ac inverters which is working very well using SG3525 oscillator as driving circuit for the mosfet,now I want to remain with that but adding the capability of charging (in case main power is lost) the same battery through the same transformer.
the transformer I am using is astep up with center tapped.
Thanks!!

 

[Mr_Rohrich]

Hi tpetar,

I am currently designing a inverter from 12-15Vdc to 230Vac aprox. 25va and later on 80va.

I want to us a dc-dc boost converter to boost the input dc to 325Vdc. Then I want to use a microcontroller to make a PWM to make a sine @ 230vac 50Hz.
Im going to boost the 12-15 via a hf-transformer to 325V. I have contacts that can build them for me if I gave him the windings, amps, etc. Im thinking about aprox. 40kHz for the switching frequency.
This voltage is then fed to H-Bridge which is driven by a microcontroller to create a 50Hz sinewave. Can the load be attached between the bridge? For example a lightbulb? Ofcourse some filtering is neccesary to get the hf components out.

Am I thinking in the right direction? Can you give me a hand with this?
Maybe you have some schematics laying around .

My goal is to make it as small as possible.

gr,
Rohrich

 

[tpetar]

Hi tpetar,

I am currently designing a inverter from 12-15Vdc to 230Vac aprox. 25va and later on 80va.

I want to us a dc-dc boost converter to boost the input dc to 325Vdc. Then I want to use a microcontroller to make a PWM to make a sine @ 230vac 50Hz.
Im going to boost the 12-15 via a hf-transformer to 325V. I have contacts that can build them for me if I gave him the windings, amps, etc. Im thinking about aprox. 40kHz for the switching frequency.
This voltage is then fed to H-Bridge which is driven by a microcontroller to create a 50Hz sinewave. Can the load be attached between the bridge? For example a lightbulb? Ofcourse some filtering is neccesary to get the hf components out.

Am I thinking in the right direction? Can you give me a hand with this?
Maybe you have some schematics laying around .

My goal is to make it as small as possible.

gr,
Rohrich

Of course my friend, You can do that. Pay attention on core type of HF trafo, to be adequate for that frequency.

Capacitors and coils used for filtering waveform. Filtering phase can be applied to the primary or the secondary side of the transformer or on both sides. Low-pass filters are applied to allow the fundamental component of the waveform to pass to the output while limiting the passage of the harmonic components. If the inverter is designed to provide power at a fixed frequency, a resonant filter can be used.

Yes my friend You thinking in the right direction.


See this material:

Low Harmonics Single Phase Multilevel Power Inverter
Low Harmonics Single Phase Multilevel Power Inverter


Digital Isolators Offer Improved Performance and Lower Cost Options for Solar PV Inverter Designs - Energy Harvesting | DigiKey

Note: Use nice heatsink and cooling for switching parts! :wink:

 

[Mr_Rohrich]

Hi Tpetar,

thanks for the pdfs. They are very helpfull. I will use parts of it. But I will let a microcontroller handel the pwm .

I will let you know how its going on..

thanks again.

 

[marioingen]

Look at UPS circuits what I send to You.

If You need individual inteligent chargers say.

estimate. I saw your answer in the forum pcb diagram or print files for eagle or whatever, could you send me email diagrams?

 

[nouman2004]

HI Tpetar
thank youvery much.

give me that PCB,I need it.

 

[Tipu606]

thanks tpetar for the circuit in post#2
its a 200W design
what changes are needed to make it a 500W inverter?
seems like the output rating depends only on the size of the ferrite core transformer
and of course the mosfets
regards

 

[codeck]

Send me Your email I will send You some complete circuit solutions.

---------- Post added at 17:53 ---------- Previous post was at 17:16 ----------

Email with attachments is on the way.

Tpetar. Please Email me too.

 

[zezoelec71]

thanks
but I want these all eagle files too ,please
can you send it to me ,please ?

 

[snandu13]

Hi,
This is snandu13.
It was very informative thread. I am also looking for 200 W Inverter Schematic with SG3525 ( 12 VDC to 220 vac Sine wave ) with Battery Charger with Battery Low Indication, Trip and Inverter on indication.
Can I get help from someone, please?

 

[babatundeawe]

hi tpetar pls can u explain the work of the 556 and 4013 pls

thanks

 

[Mr_Rohrich]

I have made the design like below.




The output of the H-Bridge is working fine. I only have to design the filter to filterout the hf components.
The problem is in the push-pull of the design. making 325V out of 14V4. Its working fine with the core i have got but it goes very slow to 325V and cannot supply a load.
When i add a load the voltage drops rappidly..
Can anyone help designing a core? The cor I am using is of a friend of mine. He tought its should do the job, but :sad:.