On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote:> And do not forget the 12V DC motor driving a 350V DC generator solution :-)Yes, an electric motor and a rubber band is the basis of many a van de Graaff generator, but it's easier to get 350 kV than it is to get 350W that way. That's REAL high voltage gain.
Very high gain transformerless boost converter - is it possible
Started by ●September 2, 2018
Reply by ●September 4, 20182018-09-04
Reply by ●September 4, 20182018-09-04
jurb6006@gmail.com wrote ....>At 150 watts that will be a fairly good size transformer and will cost money, >but still cheaper than the stacked Dicksons. And much less designing, because >with the Dicksons each stage has to be different. Different outputs, different >diodes and different caps, you must choose them all. With this many >components you don't want too much overkill. With a transformer you design >ONE circuit and call it a a day. > >Your call. I like to avoid transformers because they can become unavailable. >But sometimes you can't always get what you want. > >I just checked Digikey and no suitable transformer is readily available. Wind >your own. At the right frequency you only need a few turns in the primary. >So 4 turns there and you want 80 turns on the secondary. For a one off it >may be alot of work but handleable. For production forget it, the Chinese >probably have something.Agreed, not much work anyways, winding takes a few minutes, have some Ecores ready. At high frequencies the cores can be small. I have those in stock in several sizes. I did an about 60 W just a while back for a push pull piezo driver, 2 MOSFETs, 12 to 16 V in, 400 Vpp out, 44 kHz. Controller is PIC, using the hardware PWM outputs, sensing, frequency select, OLED display, menu, Parts just a few Euro. Inductors are fun. And any RF means inductors anyways.
Reply by ●September 4, 20182018-09-04
whit3rd wrote>On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote: > >> And do not forget the 12V DC motor driving a 350V DC generator solution :-) > >Yes, an electric motor and a rubber band is the basis of many a >van de Graaff generator, but it's easier to get 350 kV than it >is to get 350W that way. That's REAL high voltage gain.No, high power (several kW) DC motors are common, example for electric boats Mains voltage generators are common in those what's it callled petrol generators with 240V mains output, bridge rectifier 240 * sqrt(2) = 339.411255 Scrap yard, be done with it, some speed control (not the drug) LOL
Reply by ●September 4, 20182018-09-04
On Tuesday, 4 September 2018 06:05:42 UTC+1, 69883925...@nospam.org wrote:> whit3rd wrote > >On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote: > > > >> And do not forget the 12V DC motor driving a 350V DC generator solution :-) > > > >Yes, an electric motor and a rubber band is the basis of many a > >van de Graaff generator, but it's easier to get 350 kV than it > >is to get 350W that way. That's REAL high voltage gain. > > No, high power (several kW) DC motors are common, > example for electric boats > Mains voltage generators are common in those what's it callled > petrol generators with 240V mains output, > bridge rectifier 240 * sqrt(2) = 339.411255 > Scrap yard, be done with it, some speed control (not the drug) > LOLadd a carbon pile regulator NT
Reply by ●September 4, 20182018-09-04
tabbypurr wrote>On Tuesday, 4 September 2018 06:05:42 UTC+1, 69883925...@nospam.org wrote: >> whit3rd wrote >> >On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote: >> > >> >> And do not forget the 12V DC motor driving a 350V DC generator solution :-) >> > >> >Yes, an electric motor and a rubber band is the basis of many a >> >van de Graaff generator, but it's easier to get 350 kV than it >> >is to get 350W that way. That's REAL high voltage gain. >> >> No, high power (several kW) DC motors are common, >> example for electric boats >> Mains voltage generators are common in those what's it callled >> petrol generators with 240V mains output, >> bridge rectifier 240 * sqrt(2) = 339.411255 >> Scrap yard, be done with it, some speed control (not the drug) >> LOL > >add a carbon pile regulatorMechanical, centrifugal speed control, Edison already used it. No losses. I had a record player that used that https://en.wikipedia.org/wiki/Centrifugal_governor
Reply by ●September 4, 20182018-09-04
On 2018/09/03 7:55 AM, John Larkin wrote:> On 3 Sep 2018 05:15:10 -0700, Winfield Hill <hill@rowland.harvard.edu> > wrote: > >> <698839253X6D445TD@nospam.org> wrote... >>> >>> And do not forget the 12V DC motor driving a 350V DC generator solution :-) > > Dynamotor. For regulation, control the field of the generator. I think > that's an amplidyne or something. They used them for things like > aiming the guns on battleships. > >> >> 100 relays switching 100 Li-ion cells from parallel to series. > > Overkill. Two banks of 30 relays each should do it. > >Overkill. Use 4PDT 12VDC relays and I think you are down to around 50 relays...(2 batteries/relay). John
Reply by ●September 4, 20182018-09-04
On Tue, 4 Sep 2018 09:30:04 -0700, John Robertson <spam@flippers.com> wrote:>On 2018/09/03 7:55 AM, John Larkin wrote: >> On 3 Sep 2018 05:15:10 -0700, Winfield Hill <hill@rowland.harvard.edu> >> wrote: >> >>> <698839253X6D445TD@nospam.org> wrote... >>>> >>>> And do not forget the 12V DC motor driving a 350V DC generator solution :-) >> >> Dynamotor. For regulation, control the field of the generator. I think >> that's an amplidyne or something. They used them for things like >> aiming the guns on battleships. >> >>> >>> 100 relays switching 100 Li-ion cells from parallel to series. >> >> Overkill. Two banks of 30 relays each should do it. >> >> > >Overkill. Use 4PDT 12VDC relays and I think you are down to around 50 >relays...(2 batteries/relay). > >JohnThere is my relay version of the Cockcroft�Walton multiplier that Phil calls the Groucho Marx Generator. -- John Larkin Highland Technology, Inc trk jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●September 4, 20182018-09-04
On Mon, 3 Sep 2018 21:51:17 -0700 (PDT), whit3rd <whit3rd@gmail.com> wrote:>On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote: > >> And do not forget the 12V DC motor driving a 350V DC generator solution :-) > >Yes, an electric motor and a rubber band is the basis of many a >van de Graaff generator, but it's easier to get 350 kV than it >is to get 350W that way. That's REAL high voltage gain.What's the wall-plug efficiency of a Van de Graaff? -- John Larkin Highland Technology, Inc trk jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●September 4, 20182018-09-04
On Tue, 04 Sep 2018 15:27:17 GMT, <698839253X6D445TD@nospam.org> wrote:>tabbypurr wrote >>On Tuesday, 4 September 2018 06:05:42 UTC+1, 69883925...@nospam.org wrote: >>> whit3rd wrote >>> >On Monday, September 3, 2018 at 1:07:08 AM UTC-7, 69883925...@nospam.org wrote: >>> > >>> >> And do not forget the 12V DC motor driving a 350V DC generator solution :-) >>> > >>> >Yes, an electric motor and a rubber band is the basis of many a >>> >van de Graaff generator, but it's easier to get 350 kV than it >>> >is to get 350W that way. That's REAL high voltage gain. >>> >>> No, high power (several kW) DC motors are common, >>> example for electric boats >>> Mains voltage generators are common in those what's it callled >>> petrol generators with 240V mains output, >>> bridge rectifier 240 * sqrt(2) = 339.411255 >>> Scrap yard, be done with it, some speed control (not the drug) >>> LOL >> >>add a carbon pile regulator > >Mechanical, centrifugal speed control, Edison already used it. >No losses. > >I had a record player that used that > https://en.wikipedia.org/wiki/Centrifugal_governorI think the record player speed regulator was frictional hence lossy. -- John Larkin Highland Technology, Inc trk jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●September 4, 20182018-09-04
On 2018/09/04 9:34 AM, John Larkin wrote:> On Tue, 4 Sep 2018 09:30:04 -0700, John Robertson <spam@flippers.com> > wrote: > >> On 2018/09/03 7:55 AM, John Larkin wrote: >>> On 3 Sep 2018 05:15:10 -0700, Winfield Hill <hill@rowland.harvard.edu> >>> wrote: >>> >>>> <698839253X6D445TD@nospam.org> wrote... >>>>> >>>>> And do not forget the 12V DC motor driving a 350V DC generator solution :-) >>> >>> Dynamotor. For regulation, control the field of the generator. I think >>> that's an amplidyne or something. They used them for things like >>> aiming the guns on battleships. >>> >>>> >>>> 100 relays switching 100 Li-ion cells from parallel to series. >>> >>> Overkill. Two banks of 30 relays each should do it. >>> >>> >> >> Overkill. Use 4PDT 12VDC relays and I think you are down to around 50 >> relays...(2 batteries/relay). >> >> John > > There is my relay version of the Cockcroft–Walton multiplier that Phil > calls the Groucho Marx Generator. > >I'd like to see that schematic! I work on both EM and SS equipment and so enjoy all forms of electrical abuse... John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."
