Post by thread:[BUY]: 650VAC Transformer

I'm looking for a 120VAC 60Hz to 650VAC transformer, with as high an amperage as possible up to 2.5 amps output, 150mA at the bare minimum. This will be used in a power supply for a pulsed Nd:YAG laser. I would prefer a new transformer as opposed to an old one from vacuum tube electronics. Thanks, --Nick -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

If you need only one have you considered "hacking" together one? For example, a 120V-24V step down transformer (very standard) hooked up in reverse yeilds about 600V output, for 2.5A output simply look for a 24V transformer that outputs ~12.5A at 24V. You do have to be a little careful about the insulation but I'm sure you would be able to find one much easier then a 120V-650V step up transformer. TTYL > {Original Message removed}

Try this company: Nyco Transformer Company (PA) (610) 327-4106 I had them do a 3kv 1amp transformer for a university project... cost a couple hundred dollars though. Not sure they are still in business though... it was quite a few years ago. Scott F. Touchton 1550 Engineering Manager JDS Uniphase Nick Masluk <MisterTIPPY@Y To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU AHOO.COM> cc: Sent by: pic Subject: [BUY]: 650VAC Transformer microcontrolle r discussion list <PICLIST@MITVM A.MIT.EDU> 10/02/01 03:45 PM Please respond to pic microcontrolle r discussion list I'm looking for a 120VAC 60Hz to 650VAC transformer, with as high an amperage as possible up to 2.5 amps output, 150mA at the bare minimum. This will be used in a power supply for a pulsed Nd:YAG laser. I would prefer a new transformer as opposed to an old one from vacuum tube electronics. Thanks, --Nick -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body

On Tue, 2 Oct 2001, Herbert Graf wrote: > If you need only one have you considered "hacking" together one? For > example, a 120V-24V step down transformer (very standard) hooked up in > reverse yeilds about 600V output, for 2.5A output simply look for a 24V > transformer that outputs ~12.5A at 24V. You do have to be a little careful > about the insulation but I'm sure you would be able to find one much easier > then a 120V-650V step up transformer. TTYL I disagree on almost all points here. First, transformers are carefully made to work OK at the given frequency and voltage. Putting 120V 60Hz into a winding meant for 24V 60Hz will saturate the core so badly you'll think a mule kicked you. Also, 650V 2.5 A is 1650 Watts. 24V 12.5A is under 300 Watts. While you could probably put 120V 400Hz into that 24V 60Hz winding, you will need a transformer rated for 1650 Watts. At 24 volts, that is almost 60 amps, although you will only be putting 12.5 A into it. Using a transformer at other than rated voltage is not likely to be efficient, and something that big needs to be. Cheerful regards, Bob Blick P.S. I notice that although the PICLIST-to-USENET interface obscures the email address in the header, it does not do it in the body of the email, so if your message is quoted by someone else your email address passes through and is harvested by spammers. Whenever I post to the PICLIST, I get spam within a week. Whoever is doing the PICLIST-to-USENET gateway, I wish you would STOP! How many people actually read the PICLIST from USENET anyway??? > > > {Original Message removed}

At 04:14 PM 10/2/01 -0400, Herbert Graf wrote: >If you need only one have you considered "hacking" together one? For >example, a 120V-24V step down transformer (very standard) hooked up in >reverse yeilds about 600V output, for 2.5A output simply look for a 24V >transformer that outputs ~12.5A at 24V. You do have to be a little careful >about the insulation but I'm sure you would be able to find one much easier >then a 120V-650V step up transformer. TTYL No!! 120V into a 24V winding will probably give you less than 200V out, and will definitely give you SMOKE. You can go lower than rated voltage, but not higher. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" EraseMEspeffspam_OUTTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com /.-.\ (( * )) \\ // Please help if you can: \\\ dailynews.yahoo.com/fc/US/Emergency_Information/ //\\\ /// \\\ \/ \/ -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

>I'm looking for a 120VAC 60Hz to 650VAC transformer, with as high an amperage as possible up to 2.5 >amps output, 150mA at the bare minimum. This will be used in a power supply for a pulsed Nd:YAG >laser. I would prefer a new transformer as opposed to an old one from vacuum tube electronics. Do you really need AC out? I would suggest getting a suitable isolation transformer, say 3KVA, like you would use for power tools, and then have a voltage multiplier rectifier arrangement on the output. -- http://www.piclist.com hint: To leave the PICList @spam@piclist-unsubscribe-requestKILLspammitvma.mit.edu

I've never liked the idea of overrating a transformer like that. Although it can be done, if I'm going to spend a few hundred dollars on this device, I want to do it right. If at all possible I don't want to have to modify any transformers either, or have to use any type of multipliers. I'm hoping someone on here can lead me to a source of transformers for what I am looking for. But thanks for your reply, I appreciate you trying. --Nick --- Herbert Graf <KILLspammailinglistKILLspamFARCITE.NET> wrote: {Quote hidden}> If you need only one have you considered "hacking" > together one? For > example, a 120V-24V step down transformer (very > standard) hooked up in > reverse yeilds about 600V output, for 2.5A output > simply look for a 24V > transformer that outputs ~12.5A at 24V. You do have > to be a little careful > about the insulation but I'm sure you would be able > to find one much easier > then a 120V-650V step up transformer. TTYL > > > {Original Message removed}

>If at all possible I don't want to have >to modify any transformers either, or have to use any >type of multipliers. I'm hoping someone on here can >lead me to a source of transformers for what I am >looking for. Another option may be to check people who do advertising signs for transformers that drive neon signs. I do not know what the voltages involved actually are, but it may be worth a try. Another loop may be to try ballast units for mercury vapour lamps. Again I do not know what the strike/sustain voltages are, but may be in the ballcourt for what you want. -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

At 03:45 PM 10/2/01 -0400, you wrote: >I'm looking for a 120VAC 60Hz to 650VAC transformer, with as high an amperage as possible up to 2.5 amps output, 150mA at the bare minimum. This will be used in a power supply for a pulsed Nd:YAG laser. I would prefer a new transformer as opposed to an old one from vacuum tube electronics. Nick, you might want to give Hammond Manufacturing a call. Here are some: http://www.hammondmfg.com/700.htm Here are their distributors: http://www.hammondmfg.com/cldist.htm Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" spamBeGonespeffspamBeGoneinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com /.-.\ (( * )) \\ // Please help if you can: \\\ dailynews.yahoo.com/fc/US/Emergency_Information/ //\\\ /// \\\ \/ \/ -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu

Check out McMaster Carr. I believe I purchased a 220 to 600 Vac step up transformer from them at a different job. I used a 110 to 220 step up to drive it, and sized out all the KVA's. Worked ok, since it was designed to do this. I don't think I spent more than $100 on the transformers. Scott F. Touchton 1550 Engineering Manager JDS Uniphase -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

just a spurious thought Two identical microwave oven transformers Series connect the primaries (to halve the secondary voltage) Parallel connect the secondaries (to double the output current) OK so it's a stupid idea, and probably of no relevance but if you extract them from scrap units you couldn't get much cheaper 8-) Regards Chris Carr -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

At 09:03 AM 10/4/01 -0400, you wrote: >Check out McMaster Carr. I believe I purchased a 220 to 600 Vac step up >transformer from them at a different job. I used a 110 to 220 step up to >drive it, and sized out all the KVA's. Worked ok, since it was designed to >do this. I don't think I spent more than $100 on the transformers. > >Scott F. Touchton >1550 Engineering Manager >JDS Uniphase 550VAC transformers (often called "600VAC") are easy to get and cheap in Canada, and similarly 480VAC transformers in the USofA (one of the few differences in the electrical systems). This is a good idea. You'd go to the "Electrical" transformers rather than the "Electronic" types (open, dry 'control' transformers). If a 480VAC transformer secondary is put in series with the incoming 240VAC (no isolation!!!) or an isolation transformer then you get 720VAC. 120+480 = 600VAC, 550VAC + 120 = 670 VAC etc. Hammond should have both types. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" RemoveMEspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com /.-.\ (( * )) \\ // Please help if you can: \\\ dailynews.yahoo.com/fc/US/Emergency_Information/ //\\\ /// \\\ \/ \/ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Douglas Butler wrote: > > Well it is electrically sound. The transformers don't even have to be a > matched pair. What are the specs of a typical microwave oven > transformer? About a kW or more normally. An oven rated for 800w power will have a transformer that runs reasonably cool. I just sold about a hundred of them for scrap metal, got about $1 US per kg. You collect a lot of junk when you fix a few microwaves a week for years. :o) Another suggestion would be to pull one apart, unwind some of the secondary winding until you get the right output voltage, assuming of course you de-rate total power accordingly. Just don't change the primary turns. Many are dipped in goop so you might need to soak in something first. -Roman -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

More specifically what the transformer will be used for is charging a 36uF 950V capacitor. This capacitor is part of the capacitor inductor pulse forming network that drives the flashlamp. It turns out the pulse rate for this laser (SSY-1 from Meredith Instruments, http://www.mi-lasers.com) can only handle about a 1pps repetition rate, for some reason I thought it could handle a higher one, but at 1pps I won't need as large of a transformer as I originally thought. Also, it seems like the only transformers I can find that come close to what I want are around 625 volts, or 700 some volts. I want something that will be able to charge the capacitor up to 900 volts, but not go over the capacitor's voltage rating of I don't continuously fire the laser. If I can't find a transformer at this voltage, I may decide to use a multiplier to double one with half the voltage, but I don't want any x3/x4 or cascade type multipliers. And thanks to everyone for your replies up to this point! --Nick __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Allied 704-0944 650VAC @ 150 MA. Or even quicker... 704-0946 Nick Masluk wrote: {Quote hidden}> More specifically what the transformer will be used > for is charging a 36uF 950V capacitor. This capacitor > is part of the capacitor inductor pulse forming > network that drives the flashlamp. > > It turns out the pulse rate for this laser (SSY-1 from > Meredith Instruments, http://www.mi-lasers.com) can > only handle about a 1pps repetition rate, for some > reason I thought it could handle a higher one, but at > 1pps I won't need as large of a transformer as I > originally thought. > > Also, it seems like the only transformers I can find > that come close to what I want are around 625 volts, > or 700 some volts. I want something that will be able > to charge the capacitor up to 900 volts, but not go > over the capacitor's voltage rating of I don't > continuously fire the laser. Yes, so what is the peak voltage of a 625 VAC RMS transformer? (Your all done!) {Quote hidden}> > > If I can't find a transformer at this voltage, I may > decide to use a multiplier to double one with half the > voltage, but I don't want any x3/x4 or cascade type > multipliers. > > And thanks to everyone for your replies up to this > point! > > --Nick > > __________________________________________________ > Do You Yahoo!? > NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. > http://geocities.yahoo.com/ps/info1 > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- * | __O Thomas C. Sefranek tcsEraseME.....cmcorp.com |_-\<,_ Amateur Radio Operator: WA1RHP (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz hamradio.cmcorp.com/inventory/Inventory.html http://www.harvardrepeater.org -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> 950V 36uF *DC* Oh, when you rectify a voltage you get 1.41 times Vef. If you rectify by doubling, you get 2.82 times Vef. 950/2.82 is only 336Vef. You have only ~17 Joules in the cap, once per second is 16W. Assuming poor efficiency etc it is still less than 50W. A small comfy DC/DC converter will power your application easily. No iron is required. Are you sure about the cap specs ? $0.02 Peter -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

In which case a diode-capacitor voltage multiplier from the mains should do the trick - much easier than custom transformers. On Thu, 4 Oct 2001 19:57:43 -0700, you wrote: {Quote hidden}>More specifically what the transformer will be used >for is charging a 36uF 950V capacitor. This capacitor >is part of the capacitor inductor pulse forming >network that drives the flashlamp. > >It turns out the pulse rate for this laser (SSY-1 from >Meredith Instruments, http://www.mi-lasers.com) can >only handle about a 1pps repetition rate, for some >reason I thought it could handle a higher one, but at >1pps I won't need as large of a transformer as I >originally thought. > >Also, it seems like the only transformers I can find >that come close to what I want are around 625 volts, >or 700 some volts. I want something that will be able >to charge the capacitor up to 900 volts, but not go >over the capacitor's voltage rating of I don't >continuously fire the laser. > >If I can't find a transformer at this voltage, I may >decide to use a multiplier to double one with half the >voltage, but I don't want any x3/x4 or cascade type >multipliers. > >And thanks to everyone for your replies up to this >point! > >--Nick > >__________________________________________________ >Do You Yahoo!? >NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. >http://geocities.yahoo.com/ps/info1 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

For a laser supply I doubt it is an electrolytic. It is probably an oil filled metal film capacitor to get higher pulse current. Sherpa Doug {Quote hidden}> 650V * 1.414 = 919V > > This is awful close to the 950V rating of the cap. It is generally not > considered good engineering practice to run high voltage > electorlytics very > close to their max rating. > > Bob Ammerman > RAm Systems > (contract development of high performance, high function, low-level > software) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Bob, It IS AWFUL close to what the customer stated he wants! (However I agree without proper protection, one line spike and he is replacing.... stuff...) Bob Ammerman wrote: {Quote hidden}>650V * 1.414 = 919V > >This is awful close to the 950V rating of the cap. It is generally not >considered good engineering practice to run high voltage electorlytics very >close to their max rating. > >Bob Ammerman >RAm Systems >(contract development of high performance, high function, low-level >software) > >{Original Message removed}

It seems to be some type of metal film capacitor, but I do know for a fact that it is not electrolytic, as the pulse discharge must be very fast (I think it is about 100us). --Nick --- Douglas Butler <EraseMEdbutlerIMETRIX.COM> wrote: {Quote hidden}> For a laser supply I doubt it is an electrolytic. > It is probably an oil > filled metal film capacitor to get higher pulse > current. > > Sherpa Doug > > > 650V * 1.414 = 919V > > > > This is awful close to the 950V rating of the cap. > It is generally not > > considered good engineering practice to run high > voltage > > electorlytics very > > close to their max rating. > > > > Bob Ammerman > > RAm Systems > > (contract development of high performance, high > function, low-level > > software) > > -- > http://www.piclist.com hint: The list server can > filter out subtopics > (like ads or off topics) for you. See > http://www.piclist.com/#topics > > __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics