In August 1980, an article entitled "Build an Energy Storage BAnk" was published in Audio magazine by mr Jung, i would like to know your feedback regarding this construction project if ytou ever built this one...
Are you referring to the outboard energy storage for that Dynaco 80 I think it was? I seem to remember special measures (delayed relay etc) were required to avoid blowing fuses and bridges at switch-on, and to avoid the very high ripple currents to get into the amp circuitry. Never understood the advantages, but that happens often to me these days.😉
Jan Didden
Jan Didden
If someone would be so kind as to give me a link or show a schematic, I'd be happy to comment on it and try to point advantages and problems.
Jens
Jens
I have the schematic/article at home, but am travelling and can't get it before next week.
Jan Didden
Jan Didden
Basically, it just paralleled a bunch of capacitors for greater storage. It did get into inrush current limiting. It also dealt with measuring the caps before using them to see if they were alright, because he anticipated that people would use surplus caps. Advantages: increased energy supply. Disadvantage; inrush current has to be dealt with.
Pooge,
Limiting inrush current is pretty straight forward if done on the primary side, so there must be something special to it since it has gotten so much talked about.
Oh, boy.... am I curious to see if it's a "re-invention of the wheel" thing....😉
Jens
Limiting inrush current is pretty straight forward if done on the primary side, so there must be something special to it since it has gotten so much talked about.
Oh, boy.... am I curious to see if it's a "re-invention of the wheel" thing....😉
Jens
I seem to remember there was some delayed relay switching after the bridge to protect that.
Jan Didden
Jan Didden
Janneman,
So one is out traveling (since the schematic hasn't shown up), but you just couldn't resist visiting diyaudio, eh? 😉
So one is out traveling (since the schematic hasn't shown up), but you just couldn't resist visiting diyaudio, eh? 😉
my interest on the subject is to find out if any member of this comunity ever built one and what the experience was...this is really a very simple concept, i would love to find out the actual experience of the builder who built this project....
Another interesting project was proposed around the same time by Elektor, called waterworks after the designer, Guido Wasser.
It involved using all three phases of the AC utility line that goes into every house. To do this, it needed three transformers and three sets of recitifiers. It claimed to have three times the ripple supression as well as three times the ability to react to load transients for the same capacity. I have never tried it, though.
Regards,
Eric
It involved using all three phases of the AC utility line that goes into every house. To do this, it needed three transformers and three sets of recitifiers. It claimed to have three times the ripple supression as well as three times the ability to react to load transients for the same capacity. I have never tried it, though.
Regards,
Eric
Jennice said:
Well, its more like being abroad away from home than travelling per se all the time. Since I work a lot behind a corporate workstation with unlimited internet access, the urge for a quick peek at DIYaudio.com is difficult to resist...
Jan Didden
capslock said:
This would make sense, since in a 3-phase system the caps are recharged every 3.33 msec (for 50Hz) instead of every 10msec.
Jan Didden
One of our old power amps here at Brüel & Kjær readily delivers 30Amp's continuously into vibration exciters (basically same idea as a rough bass speaker unit) with a load resistance of 0.8 ohms(yes, below 1 ohm 
).
They're powered by a 3-phase transformer, and 3-phase bridges.
You don't need 3 seperate transformers and bridges.
Maybe this has given inspiration for new projects?
Btw.: Yes, it has active cooling!
Regards,
Jens
).They're powered by a 3-phase transformer, and 3-phase bridges.
You don't need 3 seperate transformers and bridges.
Maybe this has given inspiration for new projects?
Btw.: Yes, it has active cooling!
Regards,
Jens
Sorry,
The design is >20 years old, so I don't have access to it. (They're a pain for our service dept. because they rarely need service, and over time a lot of those who really new it have retired).
Jens
The design is >20 years old, so I don't have access to it. (They're a pain for our service dept. because they rarely need service, and over time a lot of those who really new it have retired).
Jens
This Thread was referred to a couple of days ago, so I had a look see.
An EI with 3 legs can have single phase on each leg and it operates on a 3 phase supply.
I don't think a toroid can be configured like that.
I suspect a 3 phase toroid transformer will actually be a bank of three single phase toroids.
The 3 phase rectifier does not have 3 times 4 diodes, I think it has just 6 diodes but I don't know how they are wired up.
An EI with 3 legs can have single phase on each leg and it operates on a 3 phase supply.
I don't think a toroid can be configured like that.
I suspect a 3 phase toroid transformer will actually be a bank of three single phase toroids.
The 3 phase rectifier does not have 3 times 4 diodes, I think it has just 6 diodes but I don't know how they are wired up.
In the UK each house only gets one phase. It may be possible to ask for more, but I suspect that would be expensive.capslock said:
Recharing every 3.33ms instead of 10ms means you can use smaller caps for a given ripple. That would seem to be the only advantage, so only if smaller caps are better for some other reason would it help audio. Smaller caps might have larger ESR and inductance so might not be better.
OK, correction: in the UK each house normally gets one phase. You can ask for three-phase, but some suppliers staff might not know what you are asking for and some suppliers might make an extra standing charge for three-phase. So you can have it, but it is still regarded as unusual.
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