DIY Good Class D amplifier

[PetruV]

Gate drive seems to work fine in simulation, i wil try it with the amp i designed and probably build it

 

[Acca]

Can you post schematic?
Waiting for results

 

[Acca]

Hi,check my simple driver,not best but good enough

Place 2R2 in series with diode on 12V,to limit current peaks.

 

[PetruV]

same schematic as yours,without amp circuit,2k2 resistor., D1 encounters 12a peak at start for 7 us

 

[PetruV]

It works well with split supply in simulation,with very hard to drive mosfets,but i dont like the 8 A on d4 in my schematic,i would dissipate more power than anything

 

[Acca]

Can you see that slow start up edge on upper gate?
I use Multisim,result is same as in practice.I try to make better driver,but without results
With resistor drive is much better,but dissipation is cca 6W (with max duty it's 12W!)

 

[PetruV]

yeah i see its pretty slow

 

[PetruV]

but again i have 3300 pf mosfets

 

[Acca]

Use 56R instead 2k2.
It will better.With BJT this circuit is very good,very fast base drive.

 

[Acca]

First with this ckt. and second with 10R 19W instead small transistor...

 

[Acca]

It works well with split supply in simulation,with very hard to drive mosfets,but i dont like the 8 A on d4 in my schematic,i would dissipate more power than anything

What about reversed PNP?
Yes,it will dissipate more than fets
I'll try another idea...

 

[stewin]

hi all cool link diysmps and very useful Calculation programs for transformers and inductors diysmps

 

[PetruV]

I dont think there are better options than gate drive transformer

 

[Acca]

Yes,but 100n series cap. may have resonance at audio freq.
Now tried with opto (HCNR200) and output is same as input

 

[Acca]

hi all cool link diysmps and very useful Calculation programs for transformers and inductors diysmps

Nice,I tried it...

 

[Acca]

I dont think there are better options than gate drive transformer

And maybe IR2184 with separated power for upper and lower fet (small flyback smps)...

 

[PetruV]

You said you can get 3kw from ee42.,my calculator says maximum of 800w, how could you determine that you can get 3kw?

 

[Acca]

Who said,and where?

 

[Acca]

Check my new progress
Class D on +/-56V 500W SMPS working now,with feedback,offset 1,8mV
Do any interested
First pic. voltage measuring. (Left meter lies,chinese s*it) Both voltages is same.
Last pic. offset
Second pic. wave after totem pole
Third pic. is voltage at drains of fets.
Fourth pic. is voltage at SMPS transformer.

 

[PetruV]

what core did you use?