Thanks, Luka.
TechGuy-
IR now has out a set of Hi-side/ Lo-side drivers rated at 1200V, for 600V+ high-power Applications. Pretty cool stuff, though I can't imagine ever needing to exceed 600V+ myself. 😎
Rej,
Yes, the IR211X chips can be directly driven by the SG3525, as the '3525 will put out +/-400mA peak, +/-200mA continuous.
TechGuy-
IR now has out a set of Hi-side/ Lo-side drivers rated at 1200V, for 600V+ high-power Applications. Pretty cool stuff, though I can't imagine ever needing to exceed 600V+ myself. 😎
TechGuy said:
Rej,
Yes, the IR211X chips can be directly driven by the SG3525, as the '3525 will put out +/-400mA peak, +/-200mA continuous.
Hi everyone,
Thanks for your valuable replies. Now it seems all of my work has come to a standstill. I was actually about to design an SMPS for driving a power amp for about 600W or more. The amp need to be powered by a generator. It is said to induce noise while using smps. Even company products suffer this problem. Is there any way in solving this problem? They say this is due to a frequecy change at the supply in..
Thanks for your valuable replies. Now it seems all of my work has come to a standstill. I was actually about to design an SMPS for driving a power amp for about 600W or more. The amp need to be powered by a generator. It is said to induce noise while using smps. Even company products suffer this problem. Is there any way in solving this problem? They say this is due to a frequecy change at the supply in..
Go on, take an oscilloscope (preferably with storage features) and investigate the shape of the waveform coming out of the generator and how does it interact with your SMPS.
Eva,
Thnks for your reply. The problem is i do not have a CRO .Besides. Im not an expert in analysing any kind of waveforms. Iam actually specialised in embedded and digital areas although i have experience in various areas of electronics. This was a part of making a power amplifier with smps and controlling the whole amplifier digitally.So I should find the easy way out.
N channel,
Thnks for your reply. This amplifier is for PA application. So mostly generators are the power source. The company product work fine in power lines, but generate severe distortion with a generator. If this problem could be solved it would be a great deal.
Thnks for your reply. The problem is i do not have a CRO .Besides. Im not an expert in analysing any kind of waveforms. Iam actually specialised in embedded and digital areas although i have experience in various areas of electronics. This was a part of making a power amplifier with smps and controlling the whole amplifier digitally.So I should find the easy way out.
N channel,
Thnks for your reply. This amplifier is for PA application. So mostly generators are the power source. The company product work fine in power lines, but generate severe distortion with a generator. If this problem could be solved it would be a great deal.
Re: Coilcraft makes Gate-drive Xfmrs!
Rej-
I have the Coilcraft catalogue in front of me: the Gate-drive transformers for half-bridge topology are SD250-3 (winding ratio of 1:1:1), and SD250-4 (winding ratio of 1:1.5:1.5).
I did a modular half/full-bridge a number of years ago using the SG3525 to drive one/two SD250-3s, which drove IRF840s at 40kHz into an FT-140-77 ferrite toroid of 38T primary, and 7T+7T secondary for +/-30V output. This setup powered 2 40W amps into a pair of Radio Schmuck Minimus-7s. Sounded great and no detectable hiss.
I'm REALLY sorry I took it apart!
N-Channel said:
Rej-
I have the Coilcraft catalogue in front of me: the Gate-drive transformers for half-bridge topology are SD250-3 (winding ratio of 1:1:1), and SD250-4 (winding ratio of 1:1.5:1.5).
I did a modular half/full-bridge a number of years ago using the SG3525 to drive one/two SD250-3s, which drove IRF840s at 40kHz into an FT-140-77 ferrite toroid of 38T primary, and 7T+7T secondary for +/-30V output. This setup powered 2 40W amps into a pair of Radio Schmuck Minimus-7s. Sounded great and no detectable hiss.
I'm REALLY sorry I took it apart!
Hi N channel,
Thanks for your reply. I think it is quite hard to find any gate drive transformer here. So i think of using high side ics. But the important issue now is the noise. If the PA amplifier generate noise, then actually there is no use in making these designs. All of them discard the smps amplifier in PA since it generate noise. Is it actually a frequency problem or something else. what u think?..
Thanks for your reply. I think it is quite hard to find any gate drive transformer here. So i think of using high side ics. But the important issue now is the noise. If the PA amplifier generate noise, then actually there is no use in making these designs. All of them discard the smps amplifier in PA since it generate noise. Is it actually a frequency problem or something else. what u think?..
Noise
Rej-
I would not completely trash the idea of doing an SMPS for your amp. Couple of very good reasons: 1) It has been done before with good success by QSC, Carver Professional (no real connection with Bob Carver), and Soundstream; and 2) As more and more mfrs adopt switching technology, it will become more and more refined, resulting in a better arguement being made for pursuing it in a DIY basis.
Obviously, to mitigate the noise problem, good electrical design, and good physical design, and selection of high-quality components is critical.
When I evaluate any piece of electrical hardware, I divide my analysis into three categories: Design Quality, Parts Quality, and Build Quality. All three are equally critical for obvious reasons.
Steve
Rej-
I would not completely trash the idea of doing an SMPS for your amp. Couple of very good reasons: 1) It has been done before with good success by QSC, Carver Professional (no real connection with Bob Carver), and Soundstream; and 2) As more and more mfrs adopt switching technology, it will become more and more refined, resulting in a better arguement being made for pursuing it in a DIY basis.
Obviously, to mitigate the noise problem, good electrical design, and good physical design, and selection of high-quality components is critical.
When I evaluate any piece of electrical hardware, I divide my analysis into three categories: Design Quality, Parts Quality, and Build Quality. All three are equally critical for obvious reasons.
Steve
rejithcv said:
If you didn't wanted to learn analog power electronics, power magnetics, etc. and you don't feel like investigating the problem, then you have been facing a dead end from the beginning. There is much more complexity than just DSP programming ivolved in such a project. I could offer SMPS consulting services to your company, but I'm already very busy doing that for others now, maybe in a month or so...
Eva, 1. :
"A nice marketing post.
I don't understand why such stuff is allowed here."
Eva, 2. :
"...I could offer SMPS consulting services to your company, but I'm already very busy doing that for others now, maybe in a month or so..."
Ahemm...I have no problem with it...but possibly others?
Sorry Eva, I can`t resist 😀
Regards
Heinz!
"A nice marketing post.
I don't understand why such stuff is allowed here."
Eva, 2. :
"...I could offer SMPS consulting services to your company, but I'm already very busy doing that for others now, maybe in a month or so..."
Ahemm...I have no problem with it...but possibly others?
Sorry Eva, I can`t resist 😀
Regards
Heinz!
N -channel,
Thanks for the info. your suggestions are quite helpful.
Eva,
Ofcourse while in designing one should consider all facts. A comparison of complexity of DSP programming and an smps designing is quite baseless, in all sense.
Thanks for the info. your suggestions are quite helpful.
Eva,
Ofcourse while in designing one should consider all facts. A comparison of complexity of DSP programming and an smps designing is quite baseless, in all sense.
Hi everybody,
One of the smps design was completed for PA amplifier based on full-brige topology. It produce unpleasant noises, while in operation, using a generator as expected . The generator's o/p frequency goes down to about 30hz at times (worst -case). So does it seem appropriate do design an smps with a wide i/p frequency range, say (10-100hz) , possibly solving the problem?
One of the smps design was completed for PA amplifier based on full-brige topology. It produce unpleasant noises, while in operation, using a generator as expected . The generator's o/p frequency goes down to about 30hz at times (worst -case). So does it seem appropriate do design an smps with a wide i/p frequency range, say (10-100hz) , possibly solving the problem?
Rej,
When you say "generator", do you mean a portable gas-powered generator, like a Generac or Coleman, or Honda? Or are you talking about a signal generator, like for testing purposes?
Steve
When you say "generator", do you mean a portable gas-powered generator, like a Generac or Coleman, or Honda? Or are you talking about a signal generator, like for testing purposes?
Steve
rejithcv said:
Are you using an active PFC converter at the input of the SMPS or are you using straightforward mains rectification?
N chan,
Ofcourse, power generators. Most of them are diesel or gas powered one.I was continuing with the previous posts...
Eva,
No active PFC are used now.
Ofcourse, power generators. Most of them are diesel or gas powered one.I was continuing with the previous posts...
Eva,
No active PFC are used now.
Hi Rej,
Which amplifier it is....i am interested in knowing the brand name of amplifier which is not happy with generators....
Meanwhile I have seen QSC PLX series with Quasi Resonant SMPS having developed problems with generators with varying frequency...whereas some models of Crown implement Hard Switching and are happier with Gensets.....
regards,
K a n w a r
Which amplifier it is....i am interested in knowing the brand name of amplifier which is not happy with generators....
Meanwhile I have seen QSC PLX series with Quasi Resonant SMPS having developed problems with generators with varying frequency...whereas some models of Crown implement Hard Switching and are happier with Gensets.....
regards,
K a n w a r
What Stranger...that Low class amp doesnot feature any SMPS, even its Mains Transformer is Still EI iron core not a Toroidal type.....
And JBL series is Speaker not a Amp.....
No Indian Company has yet launched SMPS in their amps....
Stranger is no way smps
regards,
K a n w a r
And JBL series is Speaker not a Amp.....
No Indian Company has yet launched SMPS in their amps....
Stranger is no way smps
regards,
K a n w a r
Workhorse said:
Stranger is providing a range of PA based on smps. But they are not visibly marketed, so probably they may not be available in any web sites. Due to noise much are not preferring them also.
Regarding JBl, if it so maybe i made a mistake then. The PA dealer told a number of brands that use smps but all of them are not preferred.
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