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Old 19th October 2012, 07:30 PM   #2671
stewin is offline stewin  Kenya
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Quote:
Originally Posted by pergo View Post
in that circuit, the SG3525 seems timed by 470p/50k (low image resolution doesn't help).
So switching frequency seems 60kHz.

Datasheet says that, for hard switching like half-bridge smps, 40kHz is the recommended frequency.

If you use those IGBT in a smps at those "low" frequency, they are fine.
If you use is for class D output stage, they are unsuitable

if they are using such low freq why is the output capacitors at 560uf only and they are using two pairs? and not large banks like 6800uf
what is the wattage of this smps?
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Old 19th October 2012, 09:33 PM   #2672
pergo is offline pergo  Italy
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there are 2x560uF per rail, so 1120uF total per rail @200V
They store the same energy of a 4480uF per rail @50V. Not bad for 40kHz.

The frequency is set by RC of SG3525 (see datasheet for the formula).
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Old 20th October 2012, 01:16 AM   #2673
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Hi Mr Lebon . thanks for your recommendation.
could you post the PCB for me to be sure that it's the correct one.
is it possible to run it @ 60 volts per voltage rail?
what changes are neeeded ? (e.g RSS resistor value & ...)
thanks alot ...
PCB is on POST 2646 its correct no changes needed if IRFP250N is being used
change gate resistors to 100 ohms follow irs 1500 component layout see the
small jumper near 10K preset its a easy amp to make just use T157-2 CORE
and you wont have issues building this amp and no regrets

warm regards
andrew lebon
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Old 20th October 2012, 01:55 AM   #2674
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Burning SMPS 93v-/+ and class D amp - YouTube
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Old 20th October 2012, 05:24 AM   #2675
stewin is offline stewin  Kenya
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Quote:
Originally Posted by pergo View Post
there are 2x560uF per rail, so 1120uF total per rail @200V
They store the same energy of a 4480uF per rail @50V. Not bad for 40kHz.

The frequency is set by RC of SG3525 (see datasheet for the formula).
thanks pergo. so the smps produces 1.2kwts or less?

>>>>and irfp460 fets are they superior compared to IRG4PC50U in smps , because irfp460 can run with 100khz?

Last edited by stewin; 20th October 2012 at 05:32 AM.
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Old 20th October 2012, 05:27 AM   #2676
manojtm is offline manojtm  India
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Hi andrew,
pls give me the SMPS PCB file.very interesting i like it

Regards
MANOJ
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Old 20th October 2012, 05:33 AM   #2677
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Quote:
Originally Posted by andrewlebon View Post
PCB is on POST 2646 its correct no changes needed if IRFP250N is being used
change gate resistors to 100 ohms follow irs 1500 component layout see the
small jumper near 10K preset its a easy amp to make just use T157-2 CORE
and you wont have issues building this amp and no regrets

warm regards
andrew lebon
do you have the irs 1500 pcb . since irs1500 is the same as 3000 , can i use 1500 instead?
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Old 20th October 2012, 05:53 AM   #2678
stewin is offline stewin  Kenya
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Quote:
Originally Posted by andrewlebon View Post
hi michelle veryvery cool in that video which fets are being used at that voltage, and does it have a working overcurrent protect ?

i wanted to try out irs3000d with irfp260n with +/-90vlts what gate resistor value do i have to put?
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Old 20th October 2012, 06:01 AM   #2679
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Hi Stewin
greetings 90N20 FETS are being used at 93 volts dc+/-
for irf260n 100 ohms stewin please try to get proper core for pro RESULT and the smps is tough dc rails shorted pri fuse blows its our first step in smps higher power still to come
warm regards
andrew lebon
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Old 20th October 2012, 06:05 AM   #2680
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Hi NN20
greetings not much difference in irs1500 pcb i reccomend irs3000 pcb layout
because i have made it and @2 ohms load very little heat
warm regards
andrew lebon
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