Single supply bridge UcD, referencing the signals - Page 5

Cro maniac · 2nd March 2009, 12:08 PM

Schematic

acid_k2 · 2nd March 2009, 12:32 PM

Good!
I like it.

Cro maniac · 2nd March 2009, 12:58 PM

pcb top

Cro maniac · 2nd March 2009, 12:59 PM

pcb bottom

freebird888 · 2nd April 2009, 02:01 PM

Recently I designd a digitl amplifier ,the sch and pcb is DPA-1KWB.pdf,i have changed the mosfet to ifrb23n15d and the input
triangle wave used wave generator ,when i test it ,the feedback was open-loop,
the problem is when i used 20v vcc on the mosfet,the chip IC hip4080 was burned,and I don't kown that why?
i'm sorry my english was very poor.

savu · 18th August 2010, 01:54 AM

Hello Cromaniac ...

Very nice project. After i read this thread i started wondering if it is possible to use this topology with 2 pieces of IR2110 instead of the Intersil chip.

The advantage would be that you can use it with almost 200Vdc thus reaching higher power.

I am now in the proces of simulating such a contraption in LTSpice but i have problems because i do not have the serious knowhow needed for designing such an amp.

The simulation does not give the power output that i was hoping for and has big of THD.
Another problem is that the sinewave is all crooked, witch makes me think that the feedback part is not ok and also the gain (input part) has some problems.

Mine uses LT1016 fast comparator and 2 pieces of IR2110 in fulbridge configuration, 4 pieces of IRFB4227 transistors and 180Vdc single supply for the power stage, 15Vdc for the IR drivers and the LT comparator.

I wold realy apreciate if you guys could help me make this thing stable. I have a lot to learn from this BTL topology.

Best regards,
Savu Silviu

savu · 04:28 AM

Made it work.

RMS Power is 3.1KW
THD is 1.01%
2Vpp 1Khz sine
sw freq is 1.2Mhz (don't understand why)

it still needs a lot of tweaks but the future of this looks promissing

Best Regards,
Savu Silviu

Workhorse · 18th August 2010, 07:44 AM

Your feedback is taken before filter, whereas UCD is post filter feedback type, change the feedback to after filter. Also the feedback network is missing essential components to form a UCD type amp.

savu · 18th August 2010, 06:02 PM

Thanks for the observation Workhorse.

I will look at it this night. So i will change the feedback node and also i will correct the feedback. Hope it will work this could turn out to be a really nice amp.

Best Regards,
Savu Silviu

savu · 18th August 2010, 06:13 PM

any good advice regarding the feedback? because i never designed buteworth filters or any filter :P.
If you have a link to an application note or something it would help me a lot.

Thanks again ΚΔΠШΔЯ

18th August 2010, 01:54 AM	#46
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	Hello Cromaniac ... Very nice project. After i read this thread i started wondering if it is possible to use this topology with 2 pieces of IR2110 instead of the Intersil chip. The advantage would be that you can use it with almost 200Vdc thus reaching higher power. I am now in the proces of simulating such a contraption in LTSpice but i have problems because i do not have the serious knowhow needed for designing such an amp. The simulation does not give the power output that i was hoping for and has big of THD. Another problem is that the sinewave is all crooked, witch makes me think that the feedback part is not ok and also the gain (input part) has some problems. Mine uses LT1016 fast comparator and 2 pieces of IR2110 in fulbridge configuration, 4 pieces of IRFB4227 transistors and 180Vdc single supply for the power stage, 15Vdc for the IR drivers and the LT comparator. I wold realy apreciate if you guys could help me make this thing stable. I have a lot to learn from this BTL topology. Best regards, Savu Silviu __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

18th August 2010, 07:44 AM	#48
Workhorse diyAudio Member Join Date: Dec 2004 Location: ḺΛβ	In your schematic................ Your feedback is taken before filter, whereas UCD is post filter feedback type, change the feedback to after filter. Also the feedback network is missing essential components to form a UCD type amp. __________________

18th August 2010, 06:02 PM	#49
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	Thanks for the observation Workhorse. I will look at it this night. So i will change the feedback node and also i will correct the feedback. Hope it will work this could turn out to be a really nice amp. Best Regards, Savu Silviu __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

18th August 2010, 06:13 PM	#50
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	any good advice regarding the feedback? because i never designed buteworth filters or any filter :P. If you have a link to an application note or something it would help me a lot. Thanks again ΚΔΠШΔЯ __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

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2nd March 2009, 12:32 PM	#42
acid_k2 diyAudio Member Join Date: Oct 2006	Good! I like it.

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