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@babatundeawe
Thank for the link. Its very helpful. I shall make my own calculations and check it with this site.
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The PushPull on the site from the link has only one primary coil. My design is one with a centre tap. Can this be used with the same applet?
Or should i change...
@babatundeawe
As you see in the schematics the sg3525 is selfadjusting. I think the core is collapsing like you said in a previous post.
Do you have hf-transformer design software? Like the online poweresim?
The left side of the Hbridge is fed from a micro with 50hz. The right side of the bridge is fed with 28k8kHz PWM. 50Hz is used for timing, pwm for building the sine-wave. With the right two pole filter a true sine is created. thats working fine.
Can anyone help me with some hftransformer...
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...
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.
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...
Mmmmmmmmmmm maybe a lightbulb was a poor example. :-(
I will draw up some schematics and let the board take a look at it. I hope some good suggestions are made... :grin:
@FvM: thx for correcting.
I have been reading this thread.... thx for pointing it out.
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...
I know PI is for SMPS 85 to 230 Volt mains to low voltage dc. I know i build these in the past.
The thread you mentioned is not found?
Can you give the link again?
Hi Zasto,
thanks for your quick reply.
I know what you mean. I have build one for 25VA the way you mentioned.
For 25VA it is already a big transformer!!!! And for 80Watts its gonna be a whopper :lol:
Im going for lightweight.....
Do you have experience with a HF version?
Hi everyone,
I am currently designing a inverter from 12-15Vdc to 230Vac aprox. 80Watts.
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 modified sine @ 230vac 50Hz.
Can anyone give me a help on which boost...
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