On 7/22/2020 7:43 PM, Lasse Langwadt Christensen wrote:> torsdag den 23. juli 2020 kl. 01.19.00 UTC+2 skrev bitrex: >> On 7/22/2020 5:23 PM, John Larkin wrote: >>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: >>> >>>> On 7/22/2020 10:21 AM, George Herold wrote: >>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. >>>>>> >>>>>> My specs are: >>>>>> Input: 24-28V >>>>>> Output voltage: 500-1000V adjustable via control signal >>>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>>> >>>>>> I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>>> >>>>>> There's also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don't know enough about making it adjustable and isolated. >>>>>> >>>>>> Thoughts on how to proceed? >>>>> >>>>> If you are going to try building it yourself, then I'd start with the >>>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>>> >>>>> (2018... thread here >>>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>>> >>>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>>> Gives you something to compare to if/when you have problems putting >>>>> to whole system together. >>>>> >>>>> George H. >>>>> >>>> >>>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>>> a certain kind of madness as a first project if OP has not designed and >>>> built a flyback of any type before. >>> >>> Just different numbers. Shouldn't be really hard. >>> >> >> The Thor rocket was just sort of a scaled-up kerosene burning V2: >> >> <https://www.youtube.com/watch?v=WYrrVHPur2Y> > > hopefully debugging a powersupply doesn't make fireballs like that ;) >Pretty big cap for an un-vented type, here. Sploosh! <https://www.youtube.com/watch?v=TX5FJftXmDA>
24V to 500-1000V, 20W floating DC-DC converter
Started by ●July 21, 2020
Reply by ●July 23, 20202020-07-23
Reply by ●July 23, 20202020-07-23
On 7/22/2020 1:26 PM, John Larkin wrote:> On Wed, 22 Jul 2020 12:52:25 -0400, bitrex <user@example.net> wrote: > >> On 7/22/2020 9:43 AM, jlarkin@highlandsniptechnology.com wrote: >>> On Wed, 22 Jul 2020 06:08:26 -0700 (PDT), Matt B >>> <matt.blessinger@gmail.com> wrote: >>> >>>> On Tuesday, July 21, 2020 at 10:32:47 PM UTC-5, jla...@highlandsniptechnology.com wrote: >>>>> I you want to design the whole circuit, take a look at LT3803 and its >>>>> app notes. It just always seems to work. >>>>> >>>>> Scribble some circuits and we can talk about them. LT Spice includes >>>>> the 3803 too. It seems to work just like it simulates. >>>> >>>> I generally like to design or at least modify a current design so I understand what's going on. This is new territory for me, so I'll look into a start some simulations. Thanks for the tip on the LTC3803. >>> >>> The pragmatic way to do this, at least for a one-off, is to buy a >>> dc/dc brick that has a control input, and be done. But as you say, you >>> wouldn't learn much about HV supplies. >>> >>> LTC/ADI has some starting-point simulations for the 3803. >>> >>> I'm playing with an isolated flyback right now, probably about 200 >>> volts at very low current, possibly with a voltage regulator on the >>> high side. When my customer gets un-confused about what he actually >>> needs, I'll build him a demo. >>> >>> Does you piezo move slow or fast? Win Hill has posted some interesting >>> piezo drive ideas here recently. >> >> Says he's got an implied 1000 volt piezo stack with a capacitance >> of...5uF? that doesn't sound right. > > That would lift trucks, or buildings. >Actually, it would lift 1.84lb one foot. Or one 10,000lb truck .0022 inches or one building...
Reply by ●July 23, 20202020-07-23
On 7/22/2020 2:50 PM, bitrex wrote:> On 7/22/2020 3:30 PM, George Herold wrote: >> On Wednesday, July 22, 2020 at 12:24:16 PM UTC-4, bitrex wrote: >>> On 7/22/2020 10:21 AM, George Herold wrote: >>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for >>>>> a pulser. It needs to be a floating or negative converter. >>>>> >>>>> My specs are: >>>>> Input: 24-28V >>>>> Output voltage: 500-1000V adjustable via control signal >>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>> >>>>> I've been reading through threads on different HV designs. So far >>>>> the only one I've come across that is isolated is Figure 50 of LT >>>>> Application Note 29 >>>>> (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). >>>>> It is specified for 1000V, 5W so not beefy enough. The transformer >>>>> is also obsolete, but this comment mentions potential replacements. >>>>> https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>> >>>>> >>>>> There's also this design >>>>> (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) >>>>> that is 1kV, 20W. I just don't know enough about making it >>>>> adjustable and isolated. >>>>> >>>>> Thoughts on how to proceed? >>>> >>>> If you are going to try building it yourself, then I'd start with the >>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>> >>>> (2018... thread here >>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>> >>>> >>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>> Gives you something to compare to if/when you have problems putting >>>> to whole system together. >>>> >>>> George H. >>>> >>> >>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>> a certain kind of madness as a first project if OP has not designed and >>> built a flyback of any type before. >> >> Since you bring it up, it bothered me when you said that too. >> I assume people mostly know what they are talking about. >> Why not be nice? >> >> BTW 5 uF for a piezo stack doesn't strike me as impossible. >> I used this little multilayer stacks (for motion) that were ~0.1 uf >> (only 150 V.) >> https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=61 >> >> George H. > > Do the math on how much peak current you'd need to slew a 1000 volt 5uF > piezo stack full-range to have a sub-ms response time mah dude! with a > 20 watt converter it must not be doing anything fast. the V^2 in > 0.5*C*V^2 is a bitch > > >>> >>> Even if someone here were able to provide a perfect custom design that >>> fit the bill the probability of something not working right on a first >>> prototype is high, and the probability of being able to figure it out >>> without a real working reference design or experience building more >>> modest switchers, is low >>> >>> <https://thedailywtf.com/articles/plz-email-me-teh-codez> >> >My calculator says 1000V and 5uF is 2.5 watt*seconds. So a 20W source can get there in 2.5/20 = 125 milliseconds.
Reply by ●July 23, 20202020-07-23
On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote:>On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote: >> On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote: >> >>> On 7/22/2020 5:23 PM, John Larkin wrote: >>>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: >>>> >>>>> On 7/22/2020 10:21 AM, George Herold wrote: >>>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. >>>>>>> >>>>>>> My specs are: >>>>>>> Input: 24-28V >>>>>>> Output voltage: 500-1000V adjustable via control signal >>>>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>>>> >>>>>>> I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>>>> >>>>>>> There's also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don't know enough about making it adjustable and isolated. >>>>>>> >>>>>>> Thoughts on how to proceed? >>>>>> >>>>>> If you are going to try building it yourself, then I'd start with the >>>>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>>>> >>>>>> (2018... thread here >>>>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>>>> >>>>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>>>> Gives you something to compare to if/when you have problems putting >>>>>> to whole system together. >>>>>> >>>>>> George H. >>>>>> >>>>> >>>>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>>>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>>>> a certain kind of madness as a first project if OP has not designed and >>>>> built a flyback of any type before. >>>> >>>> Just different numbers. Shouldn't be really hard. >>>> >>> >>> The Thor rocket was just sort of a scaled-up kerosene burning V2: >>> >>> <https://www.youtube.com/watch?v=WYrrVHPur2Y> >> >> >> OK, my bad. It would be really hard for you. >> >> >> > >Mooom, Mr. Larkin's trying to peer pressure me again. He say he's bad! >Peer? -- John Larkin Highland Technology, Inc Science teaches us to doubt. Claude Bernard
Reply by ●July 23, 20202020-07-23
On Thursday, July 23, 2020 at 11:58:56 PM UTC+10, jla...@highlandsniptechnology.com wrote:> On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote: > > >On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote: > >> On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote: > >> > >>> On 7/22/2020 5:23 PM, John Larkin wrote: > >>>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: > >>>> > >>>>> On 7/22/2020 10:21 AM, George Herold wrote: > >>>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote:<snip>> >>> The Thor rocket was just sort of a scaled-up kerosene burning V2: > >>> > >>> <https://www.youtube.com/watch?v=WYrrVHPur2Y> > >> > >> OK, my bad. It would be really hard for you. > > > >Mooom, Mr. Larkin's trying to peer pressure me again. He say he's bad! > > Peer?John Larkin makes more money out of slapping together electronics than the rest of us, which - in his eyes - makes him some kind of aristocrat. Any pressure he applies is from a position of social superiority - at least given his ideas about how this particular society ought to operate. Peer pressure is applied by your social equals. Narcissists expect other people to admire them quite a much as they admire themselves, and any shortfall in that admiration is insulting. He does complain about being insulted by anything less than fulsome flattery. -- Bill Sloman, Sydney -- Bill Sloman, Sydney
Reply by ●July 23, 20202020-07-23
On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote:> On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote: > >> On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote: >>> On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote: >>> >>>> On 7/22/2020 5:23 PM, John Larkin wrote: >>>>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: >>>>> >>>>>> On 7/22/2020 10:21 AM, George Herold wrote: >>>>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. >>>>>>>> >>>>>>>> My specs are: >>>>>>>> Input: 24-28V >>>>>>>> Output voltage: 500-1000V adjustable via control signal >>>>>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>>>>> >>>>>>>> I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>>>>> >>>>>>>> There's also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don't know enough about making it adjustable and isolated. >>>>>>>> >>>>>>>> Thoughts on how to proceed? >>>>>>> >>>>>>> If you are going to try building it yourself, then I'd start with the >>>>>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>>>>> >>>>>>> (2018... thread here >>>>>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>>>>> >>>>>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>>>>> Gives you something to compare to if/when you have problems putting >>>>>>> to whole system together. >>>>>>> >>>>>>> George H. >>>>>>> >>>>>> >>>>>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>>>>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>>>>> a certain kind of madness as a first project if OP has not designed and >>>>>> built a flyback of any type before. >>>>> >>>>> Just different numbers. Shouldn't be really hard. >>>>> >>>> >>>> The Thor rocket was just sort of a scaled-up kerosene burning V2: >>>> >>>> <https://www.youtube.com/watch?v=WYrrVHPur2Y> >>> >>> >>> OK, my bad. It would be really hard for you. >>> >>> >>> >> >> Mooom, Mr. Larkin's trying to peer pressure me again. He say he's bad! >> > > Peer? > > >Sometimes I find the best way to, say, get a friend a second opinion on her car accident situation on the social media for example. Look at the pictures. Say "Sigh, yep, looks like $6000 worth of damage to me. Maybe $7000. I think they're probably going to rule that a total loss.." then you wait a little bit. And another man (almost always a man) will come around and say "Nah idiot. That's no more than $3000 in damage. Actually I worked for the insurance industry for 8 years and DO know what I'm talking about, unlike you." "No way that's not a total loss." "Oh I beg to differ!" "There is definitely, no way, that you could provide an itemized assessment of all the damage to that car and what you believe the repair costs should be and have that on my friend's desk by tomorrow morning." "PFft! I could do it in my sleep." "Oh yeah?" "Yeah, punk." "OK. Well get on it." "Right. I'll show you." I am studying managerial techniques
Reply by ●July 23, 20202020-07-23
On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote:>On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote: >> On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote: >> >>> On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote: >>>> On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote: >>>> >>>>> On 7/22/2020 5:23 PM, John Larkin wrote: >>>>>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: >>>>>> >>>>>>> On 7/22/2020 10:21 AM, George Herold wrote: >>>>>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>>>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. >>>>>>>>> >>>>>>>>> My specs are: >>>>>>>>> Input: 24-28V >>>>>>>>> Output voltage: 500-1000V adjustable via control signal >>>>>>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>>>>>> >>>>>>>>> I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>>>>>> >>>>>>>>> There's also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don't know enough about making it adjustable and isolated. >>>>>>>>> >>>>>>>>> Thoughts on how to proceed? >>>>>>>> >>>>>>>> If you are going to try building it yourself, then I'd start with the >>>>>>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>>>>>> >>>>>>>> (2018... thread here >>>>>>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>>>>>> >>>>>>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>>>>>> Gives you something to compare to if/when you have problems putting >>>>>>>> to whole system together. >>>>>>>> >>>>>>>> George H. >>>>>>>> >>>>>>> >>>>>>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>>>>>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>>>>>> a certain kind of madness as a first project if OP has not designed and >>>>>>> built a flyback of any type before. >>>>>> >>>>>> Just different numbers. Shouldn't be really hard. >>>>>> >>>>> >>>>> The Thor rocket was just sort of a scaled-up kerosene burning V2: >>>>> >>>>> <https://www.youtube.com/watch?v=WYrrVHPur2Y> >>>> >>>> >>>> OK, my bad. It would be really hard for you. >>>> >>>> >>>> >>> >>> Mooom, Mr. Larkin's trying to peer pressure me again. He say he's bad! >>> >> >> Peer? >> >> >> > >Sometimes I find the best way to, say, get a friend a second opinion on >her car accident situation on the social media for example. Look at the >pictures. Say "Sigh, yep, looks like $6000 worth of damage to me. Maybe >$7000. I think they're probably going to rule that a total loss.." > >then you wait a little bit. And another man (almost always a man) will >come around and say "Nah idiot. That's no more than $3000 in damage. >Actually I worked for the insurance industry for 8 years and DO know >what I'm talking about, unlike you." > >"No way that's not a total loss." > >"Oh I beg to differ!" > >"There is definitely, no way, that you could provide an itemized >assessment of all the damage to that car and what you believe the repair >costs should be and have that on my friend's desk by tomorrow morning." > >"PFft! I could do it in my sleep." "Oh yeah?" "Yeah, punk." "OK. Well >get on it." "Right. I'll show you." > >I am studying managerial techniques >If your contribution to an electronic design forum is to tell obviously intelligent people that they shouldn't try to design electronics, management is your destiny. You can write long memos just like the blather above. A 1KV, 20 watt flyback wouldn't be difficult, except to people who are afraid to do it. -- John Larkin Highland Technology, Inc Science teaches us to doubt. Claude Bernard
Reply by ●July 23, 20202020-07-23
On 7/23/2020 11:37 AM, jlarkin@highlandsniptechnology.com wrote:> On Thu, 23 Jul 2020 11:14:20 -0400, bitrex <user@example.net> wrote: > >> On 7/23/2020 9:58 AM, jlarkin@highlandsniptechnology.com wrote: >>> On Thu, 23 Jul 2020 00:37:09 -0400, bitrex <user@example.net> wrote: >>> >>>> On 7/22/2020 10:01 PM, jlarkin@highlandsniptechnology.com wrote: >>>>> On Wed, 22 Jul 2020 19:18:54 -0400, bitrex <user@example.net> wrote: >>>>> >>>>>> On 7/22/2020 5:23 PM, John Larkin wrote: >>>>>>> On Wed, 22 Jul 2020 12:24:10 -0400, bitrex <user@example.net> wrote: >>>>>>> >>>>>>>> On 7/22/2020 10:21 AM, George Herold wrote: >>>>>>>>> On Tuesday, July 21, 2020 at 6:51:49 PM UTC-4, Matt B wrote: >>>>>>>>>> I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. >>>>>>>>>> >>>>>>>>>> My specs are: >>>>>>>>>> Input: 24-28V >>>>>>>>>> Output voltage: 500-1000V adjustable via control signal >>>>>>>>>> Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) >>>>>>>>>> >>>>>>>>>> I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure 50 of LT Application Note 29 (https://www.analog.com/media/en/technical-documentation/application-notes/an29f.pdf). It is specified for 1000V, 5W so not beefy enough. The transformer is also obsolete, but this comment mentions potential replacements. https://groups.google.com/d/msg/sci.electronics.design/F120QpxWWkc/74ljdPZ_BQAJ >>>>>>>>>> >>>>>>>>>> There's also this design (https://www.edn.com/1-kv-power-supply-produces-a-continuous-arc/) that is 1kV, 20W. I just don't know enough about making it adjustable and isolated. >>>>>>>>>> >>>>>>>>>> Thoughts on how to proceed? >>>>>>>>> >>>>>>>>> If you are going to try building it yourself, then I'd start with the >>>>>>>>> 500V 5 mA one first. I built my first flyback with the LT3083, >>>>>>>>> >>>>>>>>> (2018... thread here >>>>>>>>> https://groups.google.com/forum/?fromgroups=&hl=en#!searchin/sci.electronics.design/my$20first$20flyback%7Csort:date/sci.electronics.design/FQAIY1VaYBY/mLvGKJC2AgAJ >>>>>>>>> >>>>>>>>> Good luck. Oh buying a ready made HV supply would be a good thing. >>>>>>>>> Gives you something to compare to if/when you have problems putting >>>>>>>>> to whole system together. >>>>>>>>> >>>>>>>>> George H. >>>>>>>>> >>>>>>>> >>>>>>>> Yep. OP did not like that I disparaged/was skeptical of his plan to >>>>>>>> build a 20 watt 1000 volt converter out of the gate but it strikes me as >>>>>>>> a certain kind of madness as a first project if OP has not designed and >>>>>>>> built a flyback of any type before. >>>>>>> >>>>>>> Just different numbers. Shouldn't be really hard. >>>>>>> >>>>>> >>>>>> The Thor rocket was just sort of a scaled-up kerosene burning V2: >>>>>> >>>>>> <https://www.youtube.com/watch?v=WYrrVHPur2Y> >>>>> >>>>> >>>>> OK, my bad. It would be really hard for you. >>>>> >>>>> >>>>> >>>> >>>> Mooom, Mr. Larkin's trying to peer pressure me again. He say he's bad! >>>> >>> >>> Peer? >>> >>> >>> >> >> Sometimes I find the best way to, say, get a friend a second opinion on >> her car accident situation on the social media for example. Look at the >> pictures. Say "Sigh, yep, looks like $6000 worth of damage to me. Maybe >> $7000. I think they're probably going to rule that a total loss.." >> >> then you wait a little bit. And another man (almost always a man) will >> come around and say "Nah idiot. That's no more than $3000 in damage. >> Actually I worked for the insurance industry for 8 years and DO know >> what I'm talking about, unlike you." >> >> "No way that's not a total loss." >> >> "Oh I beg to differ!" >> >> "There is definitely, no way, that you could provide an itemized >> assessment of all the damage to that car and what you believe the repair >> costs should be and have that on my friend's desk by tomorrow morning." >> >> "PFft! I could do it in my sleep." "Oh yeah?" "Yeah, punk." "OK. Well >> get on it." "Right. I'll show you." >> >> I am studying managerial techniques >> > > If your contribution to an electronic design forum is to tell > obviously intelligent people that they shouldn't try to design > electronics, management is your destiny. You can write long memos just > like the blather above. > > A 1KV, 20 watt flyback wouldn't be difficult, except to people who are > afraid to do it. > >Pfft. No way you could design him a circuit like that by the weekend. You ain't got the guts!
Reply by ●July 23, 20202020-07-23
A 1kV 20W flyback is not much harder than a typical low voltage flyback. Just need to get the correct wire. Notice that enameled wire much be operated at much much lower voltage than what you can test it for your self. Typical errors is to not take into consideration impurities of the lacquer, elevated temperatures, stresses when winding, etc
Reply by ●July 23, 20202020-07-23
On 2020-07-23 12:12, klaus.kragelund@gmail.com wrote:> A 1kV 20W flyback is not much harder than a typical low voltage flyback. Just need to get the correct wire. Notice that enameled wire much be operated at much much lower voltage than what you can test it for your self. Typical errors is to not take into consideration impurities of the lacquer, elevated temperatures, stresses when winding, etc >And ozone from corona discharge. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
