Transformers
Archiver
Posts: 46,084
Group,
I'm looking for a simple power transformer (approx. 1200 watts) All Electronics has four 1300 watt units for $85.00, however, I am interested in locating a production supply with reasonable cost.
Thanks,
David Fixemer
fixemerd@navix.net
I'm looking for a simple power transformer (approx. 1200 watts) All Electronics has four 1300 watt units for $85.00, however, I am interested in locating a production supply with reasonable cost.
Thanks,
David Fixemer
fixemerd@navix.net
Comments
I was wondering if anyone on this list knew how to design transformers or where
to look to find this information out. I am trying to build a 500 watt 100khz
switching power supply that will bring 12volts to 60 volts. I understand the
concept of turns ratio but my question is how do I treat the primary of the
transformer? Do I treat it as merely an inductor whose value I would need to
calculate? I was also wondering about the magnetic selection of a core. How much
permeability can I have before I saturate the core using a given power level?
Thanks!
-=Randy Knutson
Do You Yahoo!?
Sign-up for Video Highlights of 2002 FIFA World Cup
[noparse][[/noparse]Non-text portions of this message have been removed]
use an ic driven boost regulator.
start with the maxim series and then try the national semiconductor and now
it seems that seiko has gotten into the fray, i was just looking their chips
up in the mouser catalog, so go to seiko's web site directly.
these ic's are really easy to use and their efficencies are much much better
than a transformer type regulator's.
norm
>From: Randy Knutson <ken_ryder@y...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] transformers
>Date: Tue, 18 Jun 2002 05:11:50 -0700 (PDT)
>
>
> Hi:
>I was wondering if anyone on this list knew how to design transformers or
>where to look to find this information out. I am trying to build a 500 watt
>100khz switching power supply that will bring 12volts to 60 volts. I
>understand the concept of turns ratio but my question is how do I treat the
>primary of the transformer? Do I treat it as merely an inductor whose value
>I would need to calculate? I was also wondering about the magnetic
>selection of a core. How much permeability can I have before I saturate the
>core using a given power level?
>Thanks!
>-=Randy Knutson
>
>
>
>
>Do You Yahoo!?
>Sign-up for Video Highlights of 2002 FIFA World Cup
>
>[noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
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boost regulator 60V
in google.
norman doty wrote:
> dont waste your time with transformers.
> use an ic driven boost regulator.
> start with the maxim series and then try the national semiconductor and now
> it seems that seiko has gotten into the fray, i was just looking their chips
> up in the mouser catalog, so go to seiko's web site directly.
> these ic's are really easy to use and their efficencies are much much better
> than a transformer type regulator's.
> norm
>
> >From: Randy Knutson <ken_ryder@y...>
> >Reply-To: basicstamps@yahoogroups.com
> >To: basicstamps@yahoogroups.com
> >Subject: [noparse][[/noparse]basicstamps] transformers
> >Date: Tue, 18 Jun 2002 05:11:50 -0700 (PDT)
> >
> >
> > Hi:
> >I was wondering if anyone on this list knew how to design transformers or
> >where to look to find this information out. I am trying to build a 500 watt
> >100khz switching power supply that will bring 12volts to 60 volts. I
> >understand the concept of turns ratio but my question is how do I treat the
> >primary of the transformer? Do I treat it as merely an inductor whose value
> >I would need to calculate? I was also wondering about the magnetic
> >selection of a core. How much permeability can I have before I saturate the
> >core using a given power level?
> >Thanks!
> >-=Randy Knutson
> >
>
>
explosion?
the guy's wanting 60 volts to power the mosfets in his power amp.
he's not mounting this inside his lead acid battery.
i could recomend he put zinc sacrificial anodes on his heat sinks.
that would take care of the galvanic action, they are available from any
good marine shop, try (atlantic & gulf fishing) in miami (www.atagulf.com)
great people.
design of switching regulators to professionals? I AM a professional.
and now ANYONE can make them if they use the new technology, and use the
appropiate data sheets for their application for the chip(s) set's they
choose to use.
the new stuff is so easy and trouble free, its amazing.
check out the new units that seiko is listing in mousers catalog.
1 ic, 1 cap, 1 coil, 1 diode complete functional unit.
their spec sheet has exact values for each, for all different volt/amp
combinations.
bye
norm
>From: "acatano2002" <acatano2002@y...>
>To: "norman doty" <normdoty@h...>
>Subject: Re: transformers
>Date: Tue, 18 Jun 2002 15:57:05 -0000
>
>You forgot a little fact, a IC switching regulator does not provide
>galvanic isolation. This might cause a BIG problem (meaning
>explosion).
>
>If you dont have a heavy Electrical Engineering and Math background,
>dont waste your time. The design of Switching regulators and High
>Frequency transformers is a task for profesionals.
>
>--- In basicstamps@y..., "norman doty" <normdoty@h...> wrote:
> > dont waste your time with transformers.
> > use an ic driven boost regulator.
> > start with the maxim series and then try the national semiconductor
>and now
> > it seems that seiko has gotten into the fray, i was just looking
>their chips
> > up in the mouser catalog, so go to seiko's web site directly.
> > these ic's are really easy to use and their efficencies are much
>much better
> > than a transformer type regulator's.
> > norm
> >
> >
> >
> > >From: Randy Knutson <ken_ryder@y...>
> > >Reply-To: basicstamps@y...
> > >To: basicstamps@y...
> > >Subject: [noparse][[/noparse]basicstamps] transformers
> > >Date: Tue, 18 Jun 2002 05:11:50 -0700 (PDT)
> > >
> > >
> > > Hi:
> > >I was wondering if anyone on this list knew how to design
>transformers or
> > >where to look to find this information out. I am trying to build a
>500 watt
> > >100khz switching power supply that will bring 12volts to 60 volts.
>I
> > >understand the concept of turns ratio but my question is how do I
>treat the
> > >primary of the transformer? Do I treat it as merely an inductor
>whose value
> > >I would need to calculate? I was also wondering about the magnetic
> > >selection of a core. How much permeability can I have before I
>saturate the
> > >core using a given power level?
> > >Thanks!
> > >-=Randy Knutson
> > >
> > >
> > >
> > >
> > >Do You Yahoo!?
> > >Sign-up for Video Highlights of 2002 FIFA World Cup
> > >
> > >[noparse][[/noparse]Non-text portions of this message have been removed]
> > >
> > >
> > >To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@y...
> > >from the same email address that you subscribed. Text in the
>Subject and
> > >Body of the message will be ignored.
> > >
> > >
> > >Your use of Yahoo! Groups is subject to
>http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
> > _________________________________________________________________
> > MSN Photos is the easiest way to share and print your photos:
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>galvanic isolation?
>explosion?
>the guy's wanting 60 volts to power the mosfets in his power amp.
>he's not mounting this inside his lead acid battery.
>i could recomend he put zinc sacrificial anodes on his heat sinks.
>that would take care of the galvanic action, they are available from any
>good marine shop, try (atlantic & gulf fishing) in miami (www.atagulf.com)
>great people.
>
>design of switching regulators to professionals? I AM a professional.
>and now ANYONE can make them if they use the new technology, and use the
>appropiate data sheets for their application for the chip(s) set's they
>choose to use.
>the new stuff is so easy and trouble free, its amazing.
>check out the new units that seiko is listing in mousers catalog.
>1 ic, 1 cap, 1 coil, 1 diode complete functional unit.
>their spec sheet has exact values for each, for all different volt/amp
>combinations.
>
>bye
>norm
Do you have a part number for a 500 watt device like the guy was originally
looking for? I've not run across anything nearly that powerful.
73 de Jim, KB3PU
take much more time to research, i thought all we were to do here is point a
person in the right or a different direction if he was at a dead end.
i for one would never use this site to try and sell my design's or
abilities.
i just want to give ideas (right or wrong, no one's perfect) to help them
think of a different (not better) way to look at a problem.
norm
ps if i happen to come across some elses' design i'll be sure and let them
know
>From: Jim Higgins <HigginsJ@s...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Re: transformers
>Date: Tue, 18 Jun 2002 19:07:58 -0400
>
>At 16:49 06/18/02, norman doty wrote:
> >galvanic isolation?
> >explosion?
> >the guy's wanting 60 volts to power the mosfets in his power amp.
> >he's not mounting this inside his lead acid battery.
> >i could recomend he put zinc sacrificial anodes on his heat sinks.
> >that would take care of the galvanic action, they are available from any
> >good marine shop, try (atlantic & gulf fishing) in miami
>(www.atagulf.com)
> >great people.
> >
> >design of switching regulators to professionals? I AM a professional.
> >and now ANYONE can make them if they use the new technology, and use the
> >appropiate data sheets for their application for the chip(s) set's they
> >choose to use.
> >the new stuff is so easy and trouble free, its amazing.
> >check out the new units that seiko is listing in mousers catalog.
> >1 ic, 1 cap, 1 coil, 1 diode complete functional unit.
> >their spec sheet has exact values for each, for all different volt/amp
> >combinations.
> >
> >bye
> >norm
>
>Do you have a part number for a 500 watt device like the guy was originally
>looking for? I've not run across anything nearly that powerful.
>
>73 de Jim, KB3PU
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
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>regrettably there is no single part number for a 500watt device, this would
>take much more time to research, i thought all we were to do here is point a
>person in the right or a different direction if he was at a dead end.
>i for one would never use this site to try and sell my design's or
>abilities.
>i just want to give ideas (right or wrong, no one's perfect) to help them
>think of a different (not better) way to look at a problem.
I'll bear that in mind in future. I was just wondering since what the guy
asked for originally was info on transformer design for a 500 watt
switching converter and was pointed emphatically to a single solid-state
device solution. I wouldn't mind having one of the latter myself and I
only asked after doing my own search and turning up nothing but devices
capable of a tiny fraction of the needed power. I'm definitely not one to
advocate any requirement to provide a full turnkey solution to every
question. OTOH, I sure don't believe in sending a guy on a the Google
equivalent of a fool's mission either.
Jim H
Harbor Freight has some good deals on power inverters, cheap too..
Leroy
Jim Higgins wrote:
>
> At 20:09 06/18/02, norman doty wrote:
>
> >regrettably there is no single part number for a 500watt device, this would
> >take much more time to research, i thought all we were to do here is point a
> >person in the right or a different direction if he was at a dead end.
> >i for one would never use this site to try and sell my design's or
> >abilities.
> >i just want to give ideas (right or wrong, no one's perfect) to help them
> >think of a different (not better) way to look at a problem.
>
> I'll bear that in mind in future. I was just wondering since what the guy
> asked for originally was info on transformer design for a 500 watt
> switching converter and was pointed emphatically to a single solid-state
> device solution. I wouldn't mind having one of the latter myself and I
> only asked after doing my own search and turning up nothing but devices
> capable of a tiny fraction of the needed power. I'm definitely not one to
> advocate any requirement to provide a full turnkey solution to every
> question. OTOH, I sure don't believe in sending a guy on a the Google
> equivalent of a fool's mission either.
>
> Jim H
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Unfortunately I haven't been able to find a maxim or national part that will
give me the 500 watts I need... It would be alright if I needed say: 12 volts at
100ma but that is not the case. What I thought about doing from what you said is
using one of those boost regulators to switch the gate of an external mosfet
(much like a pass transistor on a linear regulator) and through that method
power a transformer. Doing it this way however might just be about as much work
as going with a traditional half bridge push pull converter and PWM. Another
problem I have with those boost chips are that most of the designs I have seen
are non isolated. I was taught this is dangerous at high power levels.... Am i
right or do I stand corrected? My last thing is that I love challenges so please
don't be afraid to tell me a method that involves more than 4 parts!
Thanks!
-=Randy Knutson
Do You Yahoo!?
Sign-up for Video Highlights of 2002 FIFA World Cup
[noparse][[/noparse]Non-text portions of this message have been removed]
IR has a whole bunch of switching MOSFETS all the way up to 300 amps or so.
www.irf.com
I love the really high amp ones as you can make a motor controller that can
handle 100 amps surge
and you don't need a heatsink for the transistors. But they originally
designed these MOSFETS for
switching power supplies so somebody is using them up.
I might have missed the earlier discussions, but could a PC power supply
work?
The big servers all have huge high power switching units in them. The
surplus computer vendors
should have powersupplies sitting around. Not counting the new ones,
although most are 250-300-400 watt supplies.
Here in Dallas I remember that Tanner's had a pretty heavy duty 48v to 12v
converter going for a pretty cheap price, I forget the details right now.
Not enough coffee yet. http://www.tannerelectronics.com/
you could give them a call. They did have some pretty spectacular weird
surplus transformers in there when I was there last. One of them looks like
it could have been a 50 amp switcher transformer for something big.
http://www.allelectronics.com/cgi-bin/category.cgi?category=480&item=PS-550&
type=store
has a 500 watt surplus switcher, 5volts at 85 amps sounds good enough for a
homemade welder to me.
Of course the 12v at 12amps may not be enough. But it is cheap only $25.00.
https://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/Jameco/pageDisplay.d2w/r
eport?content=products&cgrfnbr=548&ctgys=504;548;
has some 500 w supplies, 24v at 21 amps is pretty healthy.
Original Message
From: Randy Knutson [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=DzCWeyTTTbJ0md_EWm9Lh5mut3IRdaBgYvsvEuVjDCl0QxaaRoqu1iubZ7lw5W9qbJRUPiWNJ1eTwQBZ]ken_ryder@y...[/url
Sent: Wednesday, June 19, 2002 4:19 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] transformers
Hi:
Unfortunately I haven't been able to find a maxim or national part that will
give me the 500 watts I need... It would be alright if I needed say: 12
volts at 100ma but that is not the case. What I thought about doing from
what you said is using one of those boost regulators to switch the gate of
an external mosfet (much like a pass transistor on a linear regulator) and
through that method power a transformer. Doing it this way however might
just be about as much work as going with a traditional half bridge push pull
converter and PWM. Another problem I have with those boost chips are that
most of the designs I have seen are non isolated. I was taught this is
dangerous at high power levels.... Am i right or do I stand corrected? My
last thing is that I love challenges so please don't be afraid to tell me a
method that involves more than 4 parts!
Thanks!
-=Randy Knutson
Do You Yahoo!?
Sign-up for Video Highlights of 2002 FIFA World Cup
[noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
"acatano2002@y..." is an invalid address, ALL email sent to it bounces
back.
next please pay a little more attention to what you read!
his power source is 12 volt batteries, not 120-v mains.
ahemm, you were saying?
norm
>From: "acatano2002" <acatano2002@y...>
>To: "norman doty" <normdoty@h...>
>Subject: Re: transformers
>Date: Wed, 19 Jun 2002 01:49:58 -0000
>
>Galvanic Isolation.
>I guess you dont understand the term (if you are a profesional in
>Electrical or Electronic Engineering should know better) any
>switching regulator connected between the AC mains and a gounded
>load has to have galvanic isolation or in other terms, isolation
>between input and output (that is the function of the tranformer).
>Read what UL or CSA has to say about it.
>
>--- In basicstamps@y..., "norman doty" <normdoty@h...> wrote:
> > galvanic isolation?
> > explosion?
> > the guy's wanting 60 volts to power the mosfets in his power amp.
> > he's not mounting this inside his lead acid battery.
> > i could recomend he put zinc sacrificial anodes on his heat sinks.
> > that would take care of the galvanic action, they are available
>from any
> > good marine shop, try (atlantic & gulf fishing) in miami
>(www.atagulf.com)
> > great people.
> >
> > design of switching regulators to professionals? I AM a
>professional.
> > and now ANYONE can make them if they use the new technology, and
>use the
> > appropiate data sheets for their application for the chip(s) set's
>they
> > choose to use.
> > the new stuff is so easy and trouble free, its amazing.
> > check out the new units that seiko is listing in mousers catalog.
> > 1 ic, 1 cap, 1 coil, 1 diode complete functional unit.
> > their spec sheet has exact values for each, for all different
>volt/amp
> > combinations.
> >
> > bye
> > norm
> >
> >
> >
> >
> > >From: "acatano2002" <acatano2002@y...>
> > >To: "norman doty" <normdoty@h...>
> > >Subject: Re: transformers
> > >Date: Tue, 18 Jun 2002 15:57:05 -0000
> > >
> > >You forgot a little fact, a IC switching regulator does not provide
> > >galvanic isolation. This might cause a BIG problem (meaning
> > >explosion).
> > >
> > >If you dont have a heavy Electrical Engineering and Math
>background,
> > >dont waste your time. The design of Switching regulators and High
> > >Frequency transformers is a task for profesionals.
> > >
> > >--- In basicstamps@y..., "norman doty" <normdoty@h...> wrote:
> > > > dont waste your time with transformers.
> > > > use an ic driven boost regulator.
> > > > start with the maxim series and then try the national
>semiconductor
> > >and now
> > > > it seems that seiko has gotten into the fray, i was just looking
> > >their chips
> > > > up in the mouser catalog, so go to seiko's web site directly.
> > > > these ic's are really easy to use and their efficencies are much
> > >much better
> > > > than a transformer type regulator's.
> > > > norm
> > > >
> > > >
> > > >
> > > > >From: Randy Knutson <ken_ryder@y...>
> > > > >Reply-To: basicstamps@y...
> > > > >To: basicstamps@y...
> > > > >Subject: [noparse][[/noparse]basicstamps] transformers
> > > > >Date: Tue, 18 Jun 2002 05:11:50 -0700 (PDT)
> > > > >
> > > > >
> > > > > Hi:
> > > > >I was wondering if anyone on this list knew how to design
> > >transformers or
> > > > >where to look to find this information out. I am trying to
>build a
> > >500 watt
> > > > >100khz switching power supply that will bring 12volts to 60
>volts.
> > >I
> > > > >understand the concept of turns ratio but my question is how
>do I
> > >treat the
> > > > >primary of the transformer? Do I treat it as merely an inductor
> > >whose value
> > > > >I would need to calculate? I was also wondering about the
>magnetic
> > > > >selection of a core. How much permeability can I have before I
> > >saturate the
> > > > >core using a given power level?
> > > > >Thanks!
> > > > >-=Randy Knutson
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >Do You Yahoo!?
> > > > >Sign-up for Video Highlights of 2002 FIFA World Cup
> > > > >
> > > > >[noparse][[/noparse]Non-text portions of this message have been removed]
> > > > >
> > > > >
> > > > >To UNSUBSCRIBE, just send mail to:
> > > > > basicstamps-unsubscribe@y...
> > > > >from the same email address that you subscribed. Text in the
> > >Subject and
> > > > >Body of the message will be ignored.
> > > > >
> > > > >
> > > > >Your use of Yahoo! Groups is subject to
> > >http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > > >
> > > >
> > > >
>_________________________________________________________________
> > > > MSN Photos is the easiest way to share and print your photos:
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> >
> >
> >
> >
> >
> >
> > _________________________________________________________________
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>http://mobile.msn.com
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but he wanted 500W of power, only three things i can come up with are 1
electro plating, 2 edm of metal, 3 power for the high end of some sort of
fet amplifiers.
norm
>From: Jim Higgins <HigginsJ@s...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Re: transformers
>Date: Tue, 18 Jun 2002 21:27:29 -0400
>
>At 20:09 06/18/02, norman doty wrote:
>
> >regrettably there is no single part number for a 500watt device, this
>would
> >take much more time to research, i thought all we were to do here is
>point a
> >person in the right or a different direction if he was at a dead end.
> >i for one would never use this site to try and sell my design's or
> >abilities.
> >i just want to give ideas (right or wrong, no one's perfect) to help them
> >think of a different (not better) way to look at a problem.
>
>I'll bear that in mind in future. I was just wondering since what the guy
>asked for originally was info on transformer design for a 500 watt
>switching converter and was pointed emphatically to a single solid-state
>device solution. I wouldn't mind having one of the latter myself and I
>only asked after doing my own search and turning up nothing but devices
>capable of a tiny fraction of the needed power. I'm definitely not one to
>advocate any requirement to provide a full turnkey solution to every
>question. OTOH, I sure don't believe in sending a guy on a the Google
>equivalent of a fool's mission either.
>
>
>Jim H
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
_________________________________________________________________
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have missed it) what you want to do. The group may suggest a solution
for that problem you never thought of.
regards,
Leroy
N8VRC
Randy Knutson wrote:
>
> Hi:
> Unfortunately I haven't been able to find a maxim or national part that will
give me the 500 watts I need... It would be alright if I needed say: 12 volts at
100ma but that is not the case. What I thought about doing from what you said is
using one of those boost regulators to switch the gate of an external mosfet
(much like a pass transistor on a linear regulator) and through that method
power a transformer. Doing it this way however might just be about as much work
as going with a traditional half bridge push pull converter and PWM. Another
problem I have with those boost chips are that most of the designs I have seen
are non isolated. I was taught this is dangerous at high power levels.... Am i
right or do I stand corrected? My last thing is that I love challenges so please
don't be afraid to tell me a method that involves more than 4 parts!
> Thanks!
> -=Randy Knutson
>
>
> Do You Yahoo!?
> Sign-up for Video Highlights of 2002 FIFA World Cup
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
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Well i have a feeling this is going to be a pretty big project... What I am
trying to do is make a 500 watt RMS class D audio amplifier and an accompanying
power supply for automotive purposes. Assuming the amplifier is 80% efficient at
worst case this calls for something that can put out a little more than 600
watts. Ohms law combined with the power law says that if I have a 4 ohm load I
will need about 50 volts to get my 500 watts RMS. 12volts won't cut it. I looked
at many different ways in trying to get my output power. ie. bridging smaller
amplifiers and bridging the bridge, but in the end this probably wouldn't work
out and even if it did would cost too much money. This along with looking into
many other high powered car amplifiers led me to believe that a switching power
supply would be my only way out. I thank everyone for all the help they have
provided me because I have found the neccessary information to proceed to the
next step and when I finish I will put the project up on a web site.
Thanks!
-=Randy Knutson
KB0YAC
Leroy Hall <leroy@f...> wrote: I would suggest you state simply (if you
did already -- sorry I must
have missed it) what you want to do. The group may suggest a solution
for that problem you never thought of.
regards,
Leroy
N8VRC
Randy Knutson wrote:
>
> Hi:
> Unfortunately I haven't been able to find a maxim or national part that will
give me the 500 watts I need... It would be alright if I needed say: 12 volts at
100ma but that is not the case. What I thought about doing from what you said is
using one of those boost regulators to switch the gate of an external mosfet
(much like a pass transistor on a linear regulator) and through that method
power a transformer. Doing it this way however might just be about as much work
as going with a traditional half bridge push pull converter and PWM. Another
problem I have with those boost chips are that most of the designs I have seen
are non isolated. I was taught this is dangerous at high power levels.... Am i
right or do I stand corrected? My last thing is that I love challenges so please
don't be afraid to tell me a method that involves more than 4 parts!
> Thanks!
> -=Randy Knutson
>
>
> Do You Yahoo!?
> Sign-up for Video Highlights of 2002 FIFA World Cup
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[noparse][[/noparse]Non-text portions of this message have been removed]
switching PS directly into the class D (switching) amplifier????
Maybe a switching PS for each channel? and the PS output has the
audio modulation 'built-in'?
(patent not pending, this message is to be construed as
'Public Disclosure')
At 12:17 PM -0700 on 6/19/02, Randy Knutson wrote
>Hi!
> Well i have a feeling this is going to be a pretty big project...
>What I am trying to do is make a 500 watt RMS class D audio
>amplifier and an accompanying power supply for automotive purposes.
>Assuming the amplifier is 80% efficient at worst case this calls for
>something that can put out a little more than 600 watts. Ohms law
>combined with the power law says that if I have a 4 ohm load I will
>need about 50 volts to get my 500 watts RMS. 12volts won't cut it. I
>looked at many different ways in trying to get my output power. ie.
>bridging smaller amplifiers and bridging the bridge, but in the end
>this probably wouldn't work out and even if it did would cost too
>much money. This along with looking into many other high powered car
>amplifiers led me to believe that a switching power supply would be
>my only way out. I thank everyone for all the help they have
>provided me because I have found the neccessary information to
>proceed to the next step and when I finish I will put the project up
>on a web site.
>Thanks!
>-=Randy Knutson
>KB0YAC
--
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Chuck Britton Education is what is left when
britton@n... you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 416-2762 (not in summer) Albert Einstein, 1936
than that, of those high power automotive car stereo amplifiers. They
use a step up switching transformer inside to boost the supply voltage
for the amps. Any reason you would not want to just use one of those?
They are cheap and already made. Course I guess a trip to a service
store might get you a print of one of them and that might be a good
hints on how to make one.
HTH,
Leroy
N8VRC
Randy Knutson wrote:
>
> Hi!
> Well i have a feeling this is going to be a pretty big project... What I am
trying to do is make a 500 watt RMS class D audio amplifier and an accompanying
power supply for automotive purposes. Assuming the amplifier is 80% efficient at
worst case this calls for something that can put out a little more than 600
watts. Ohms law combined with the power law says that if I have a 4 ohm load I
will need about 50 volts to get my 500 watts RMS. 12volts won't cut it. I looked
at many different ways in trying to get my output power. ie. bridging smaller
amplifiers and bridging the bridge, but in the end this probably wouldn't work
out and even if it did would cost too much money. This along with looking into
many other high powered car amplifiers led me to believe that a switching power
supply would be my only way out. I thank everyone for all the help they have
provided me because I have found the neccessary information to proceed to the
next step and when I finish I will put the project
> up on a web site.
> Thanks!
> -=Randy Knutson
> KB0YAC
> Leroy Hall <leroy@f...> wrote: I would suggest you state simply (if you
did already -- sorry I must
> have missed it) what you want to do. The group may suggest a solution
> for that problem you never thought of.
>
> regards,
>
> Leroy
> N8VRC
>
> Randy Knutson wrote:
> >
> > Hi:
> > Unfortunately I haven't been able to find a maxim or national part that will
give me the 500 watts I need... It would be alright if I needed say: 12 volts at
100ma but that is not the case. What I thought about doing from what you said is
using one of those boost regulators to switch the gate of an external mosfet
(much like a pass transistor on a linear regulator) and through that method
power a transformer. Doing it this way however might just be about as much work
as going with a traditional half bridge push pull converter and PWM. Another
problem I have with those boost chips are that most of the designs I have seen
are non isolated. I was taught this is dangerous at high power levels.... Am i
right or do I stand corrected? My last thing is that I love challenges so please
don't be afraid to tell me a method that involves more than 4 parts!
> > Thanks!
> > -=Randy Knutson
> >
> >
> > Do You Yahoo!?
> > Sign-up for Video Highlights of 2002 FIFA World Cup
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
> To UNSUBSCRIBE, just send mail to:
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> from the same email address that you subscribed. Text in the Subject and Body
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>
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>
>
> Do You Yahoo!?
> Sign-up for Video Highlights of 2002 FIFA World Cup
>
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>
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>Jim,
>
>Harbor Freight has some good deals on power inverters, cheap too..
Thanks. I know about that sort of solution. I was interested only in the
possibilities of that implied one solid state device solution. I thought
something had slipped past me - which wouldn't be at all unlikely... ;-)
Thanks again.
Jim H
>first why are you hiding behind a "blind" email address
>"acatano2002@y..." is an invalid address, ALL email sent to it bounces
>back.
>
>next please pay a little more attention to what you read!
>
>his power source is 12 volt batteries, not 120-v mains.
>
>ahemm, you were saying?
Norm, calm down. Weren't you the guy who failed to read the original
request for a 500 watt capable transformer design and instead suggested a
single chip solid state solution when no such solution exists? I may not be
the perfect person to be suggesting this, but maybe you should consider
giving the guy a break - or at least not increasing your opportunity for
embarrassment.
Please also consider -
1. If BasicStamps list mail bounces back like all the rest, who are you
talking to anyhow?
2. My own good friend's known-to-be-valid Yahoo address was bouncing mail
in the past few days and has done it before. Before because Yahoo was
screwed up, and recently because the inbox was filled over the quota by a
huge movie file sent by someone with a broadband connection and a big grudge.
Things may not always what they seem to be.
Jim H
>this person needed to boost 12 VDC to 60 VDC he didnt give an exact reason,
>but he wanted 500W of power, only three things i can come up with are 1
>electro plating, 2 edm of metal, 3 power for the high end of some sort of
>fet amplifiers.
Norm, I'm at a total loss how some guess at the intended use has anything
at all to do with anything. It doesn't matter - the proposed single IC
solution didn't exist.
Regards,
JimH
> >From: Jim Higgins <HigginsJ@s...>
> >Reply-To: basicstamps@yahoogroups.com
> >To: basicstamps@yahoogroups.com
> >Subject: Re: [noparse][[/noparse]basicstamps] Re: transformers
> >Date: Tue, 18 Jun 2002 21:27:29 -0400
> >
> >At 20:09 06/18/02, norman doty wrote:
> >
> > >regrettably there is no single part number for a 500watt device,
> this >would
> > >take much more time to research, i thought all we were to do here is
> point a
> > >person in the right or a different direction if he was at a dead end.
> > >i for one would never use this site to try and sell my design's or
> abilities.
> > >i just want to give ideas (right or wrong, no one's perfect) to help them
> > >think of a different (not better) way to look at a problem.
> >I'll bear that in mind in future. I was just wondering since what the guy
> >asked for originally was info on transformer design for a 500 watt
> >switching converter and was pointed emphatically to a single solid-state
> >device solution. I wouldn't mind having one of the latter myself and I
> >only asked after doing my own search and turning up nothing but devices
> >capable of a tiny fraction of the needed power. I'm definitely not one to
> >advocate any requirement to provide a full turnkey solution to every
> >question. OTOH, I sure don't believe in sending a guy on a the Google
> >equivalent of a fool's mission either.
> >
> >Jim H