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Old 6th December 2010, 12:43 PM   #641
luka is offline luka  Slovenia
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haha, nice one Pafi, really sums up the schematic
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Old 6th December 2010, 01:09 PM   #642
qsa is offline qsa  Germany
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Quote:
Originally Posted by Pafi View Post
This is smoke generator. Check reference voltages! Negative rail vs. GND!

1. Do you mean PIN 1 from IC4 NE555 ? have change from negative rail to GND in schematic look attachment otherwise I cant find the fault.

Can you assist me ?


2. DP2000-M-01.pdf Attachment schematic from professional digital amp with IR2113 IC, in this design we can see short circuit/overcurrent protection

I think here we can find some ideas to improve our UCD

Any comments about this design ?
Attached Files
File Type: pdf Class D UCD BETA01 06.12.pdf (43.8 KB, 666 views)
File Type: pdf DP2000-M-01.pdf (81.8 KB, 863 views)
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Old 6th December 2010, 02:07 PM   #643
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Quote:
Originally Posted by qsa View Post
1. Do you mean PIN 1 from IC4 NE555 ? have change from negative rail to GND in schematic look attachment otherwise I cant find the fault.

Can you assist me ?


2. DP2000-M-01.pdf Attachment schematic from professional digital amp with IR2113 IC, in this design we can see short circuit/overcurrent protection

I think here we can find some ideas to improve our UCD

Any comments about this design ?
The DC protection is a crowbar protection, which should trigger the other protection (overcurrent), if not, then it can be used as an explosion-effect.
The schemtaic uses a shunt to sense current. Problem: you choose low Rdson fets, and low R inductors to increase efficiency, the shunt increases your resistance. Otherwise it is really easy, you can design it yourself, but all these design only sense ONE SIDE! (so the FETs should be designed to withstand short circuit for a short time, until the one side sense is triggered, trigger should be deisgned to be not to fast, but not to slow, if too fast, transients trigger it, if two slow, killed FETs).
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Old 6th December 2010, 03:14 PM   #644
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by qsa View Post
1. Do you mean PIN 1 from IC4 NE555 ? have change from negative rail to GND in schematic look attachment otherwise I cant find the fault.
Still not good. Input of the protection circuit is at -85 V, but output is around 0 V! Who will carry the signal through? You need a level shifter (or different control point, like SD input).
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Old 7th December 2010, 01:24 AM   #645
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HI STEWIN
greetings see diysmps daviodords d class 3 pairs irfp240
thanking you
andrew lebon
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Old 7th December 2010, 05:02 PM   #646
stewin is offline stewin  Kenya
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thanks trying to reach it
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Old 7th December 2010, 06:55 PM   #647
stewin is offline stewin  Kenya
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hi guys pls can you post a simple discreet schematic which can drive irfp260 or irfp250 with this circuit . i would be more than glad to use tc or maxim microchips or the required fets "irfb's or 4227's" but at my location i have to go through all the strugle to work with the available parts . pls guys a discreet schema to drive my fets with this circuit. i have used irf540 they are excellent compared to the above but i need to use high voltage be blessed all of you stewin
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Old 8th December 2010, 04:41 PM   #648
qsa is offline qsa  Germany
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I think IRS20124 is very interested IC for UCD Amp

IRS20124 has a lot of internal protections and programmable deadtime

but dont have HIN and LIN inputs compare to IR2110 / IR2113

Any idea to how to replace IR2110 with IRS20124 ?
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Old 8th December 2010, 07:22 PM   #649
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Tomorow I will have pcb for this ampplifier, finaly.

I also have IRFP240 and IRFP260 (20 pic of each), what is better to use?

Once again I ask, output coil is 20uH with 1uF cap. (I use iron powder core T106-26 with 1mm gap and 24 turns with 2x0.8mm wire?)

Thanks
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Old 8th December 2010, 10:58 PM   #650
stewin is offline stewin  Kenya
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try irfp260 they are not the best to use but they are superior to the irfp240 i.e if you have no choice.and better use low voltage if you insist on t106-26 or mount it far from your pcb because at high voltage like +/-70 it generates heat equivalent to a standard soldering gun .or try 30turns on a gaped ETD core it will handle high voltage comfortably cheers
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