Can I use this for 220V input and 380V output? https://www.ebay.com/itm/255681909221 This should give me around 400V to 450V full bridge rectified DC.
Swapping transformer I/O
Started by ●July 1, 2023
Reply by ●July 1, 20232023-07-01
On a sunny day (Fri, 30 Jun 2023 20:55:08 -0700 (PDT)) it happened Eddy Lee <eddy711lee@gmail.com> wrote in <c944dcc8-8559-4276-bf78-b5e534061f1an@googlegroups.com>:>Can I use this for 220V input and 380V output? > >https://www.ebay.com/itm/255681909221 > >This should give me around 400V to 450V full bridge rectified DC.450 / sqrt(2) = 318 318 - 220 = 98 Only 100 V extra needed! So basically you can use a 220 to 100 V transformer in series with the 220 to get to 318 So less copper / money / weight needed. In phase that is :-)
Reply by ●July 1, 20232023-07-01
On Friday, June 30, 2023 at 9:39:22 PM UTC-7, Jan Panteltje wrote:> On a sunny day (Fri, 30 Jun 2023 20:55:08 -0700 (PDT)) it happened Eddy Lee > <eddy7...@gmail.com> wrote in > <c944dcc8-8559-4276...@googlegroups.com>: > >Can I use this for 220V input and 380V output? > > > >https://www.ebay.com/itm/255681909221 > > > >This should give me around 400V to 450V full bridge rectified DC. > 450 / sqrt(2) = 318 > 318 - 220 = 98 > > Only 100 V extra needed! > > So basically you can use a 220 to 100 V transformer in series with the 220 to get to 318 > So less copper / money / weight needed. > In phase that is :-)Yes in theory, but ... I get around 250V DC out of the 220V AC inverter. Probably need high 300 AC to get 400 DC.
Reply by ●July 1, 20232023-07-01
On a sunny day (Fri, 30 Jun 2023 21:46:53 -0700 (PDT)) it happened Eddy Lee <eddy711lee@gmail.com> wrote in <e9e3922c-3d4d-4459-95bd-40cad033df03n@googlegroups.com>:>On Friday, June 30, 2023 at 9:39:22 PM UTC-7, Jan Panteltje wrote: >> On a sunny day (Fri, 30 Jun 2023 20:55:08 -0700 (PDT)) it happened Eddy L= >ee >> <eddy7...@gmail.com> wrote in >> <c944dcc8-8559-4276...@googlegroups.com>: >> >Can I use this for 220V input and 380V output? >> > >> >https://www.ebay.com/itm/255681909221 >> > >> >This should give me around 400V to 450V full bridge rectified DC. >> 450 / sqrt(2) = 318 >> 318 - 220 = 98 >> >> Only 100 V extra needed! >> >> So basically you can use a 220 to 100 V transformer in series with the 22= >0 to get to 318 >> So less copper / money / weight needed. >> In phase that is :-) > >Yes in theory, but ... > >I get around 250V DC out of the 220V AC inverter. >Probably need high 300 AC to get 400 DC.Ah, from an inverter, likely not a pure sinewave output one, that likely has a square wave like output to approximate a 'sinewave', like this UPS one I have: https://panteltje.nl/pub/APC_UPS_ES700_waveform_25W_edison_bulb_load_IMG_0270.JPG The same math stays, but not sqrt(2) but 250 / 220 450 / (250 / 220) = 396 V 396 - 220 = 176 V Then you need a 220 to 176 V transformer in series... Not a standard thing. So indeed then the ebay thing should work.. given the inverter can handle it. For real work I have a 2000 Watt pure sinewave 12 V to 230 V one: https://panteltje.nl/pub/250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG and a 250 Ah hour lifepo4 battery pack. Sinewave is better ... Also depends how many Watts / current yoy need for that 450 V DC. Maybe simple switcher ? Or you could use a voltage doubler circuit: --|>|--------- + | | | === | --- | | 500 V |- -AC--| | | | === | --- | | --|<|-------- - simplest solution!
Reply by ●July 1, 20232023-07-01
Jan Panteltje wrote: -----------------------------> > > >I get around 250V DC out of the 220V AC inverter. > >Probably need high 300 AC to get 400 DC. > > Ah, from an inverter, likely not a pure sinewave output one, > that likely has a square wave like output to approximate a 'sinewave',** So the peak voltage is likely out of spec. But does the OP have some filtering on that rectified DC ? If not, average DC value applies rather than peak. .... Phil
Reply by ●July 1, 20232023-07-01
On Friday, June 30, 2023 at 11:55:14 PM UTC-4, Eddy Lee wrote:> Can I use this for 220V input and 380V output? > > https://www.ebay.com/itm/255681909221 > > This should give me around 400V to 450V full bridge rectified DC.Where would you get 220V for the input? The US is 240V. -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
Reply by ●July 1, 20232023-07-01
On Saturday, July 1, 2023 at 2:24:04 AM UTC-7, Phil Allison wrote:> Jan Panteltje wrote: > ----------------------------- > > > > > >I get around 250V DC out of the 220V AC inverter. > > >Probably need high 300 AC to get 400 DC. > > > > Ah, from an inverter, likely not a pure sinewave output one, > > that likely has a square wave like output to approximate a 'sinewave', > ** So the peak voltage is likely out of spec. > > But does the OP have some filtering on that rectified DC ? > If not, average DC value applies rather than peak.47uF 400V cap.
Reply by ●July 1, 20232023-07-01
On Saturday, July 1, 2023 at 2:45:14 AM UTC-7, Ricky wrote:> On Friday, June 30, 2023 at 11:55:14 PM UTC-4, Eddy Lee wrote: > > Can I use this for 220V input and 380V output? > > > > https://www.ebay.com/itm/255681909221 > > > > This should give me around 400V to 450V full bridge rectified DC. > Where would you get 220V for the input? The US is 240V.48V DC to 220V AC inverter
Reply by ●July 1, 20232023-07-01
On Saturday, July 1, 2023 at 1:36:15 AM UTC-7, Jan Panteltje wrote:> On a sunny day (Fri, 30 Jun 2023 21:46:53 -0700 (PDT)) it happened Eddy Lee > <eddy7...@gmail.com> wrote in > <e9e3922c-3d4d-4459...@googlegroups.com>: > >On Friday, June 30, 2023 at 9:39:22 PM UTC-7, Jan Panteltje wrote: > >> On a sunny day (Fri, 30 Jun 2023 20:55:08 -0700 (PDT)) it happened Eddy L= > >ee > >> <eddy7...@gmail.com> wrote in > >> <c944dcc8-8559-4276...@googlegroups.com>: > >> >Can I use this for 220V input and 380V output? > >> > > >> >https://www.ebay.com/itm/255681909221 > >> > > >> >This should give me around 400V to 450V full bridge rectified DC. > >> 450 / sqrt(2) = 318 > >> 318 - 220 = 98 > >> > >> Only 100 V extra needed! > >> > >> So basically you can use a 220 to 100 V transformer in series with the 22= > >0 to get to 318 > >> So less copper / money / weight needed. > >> In phase that is :-) > > > >Yes in theory, but ... > > > >I get around 250V DC out of the 220V AC inverter. > >Probably need high 300 AC to get 400 DC. > Ah, from an inverter, likely not a pure sinewave output one, > that likely has a square wave like output to approximate a 'sinewave', like this UPS one I have: > https://panteltje.nl/pub/APC_UPS_ES700_waveform_25W_edison_bulb_load_IMG_0270.JPG > > The same math stays, but not sqrt(2) but 250 / 220 > 450 / (250 / 220) = 396 V > 396 - 220 = 176 V > > Then you need a 220 to 176 V transformer in series... > Not a standard thing. > > So indeed then the ebay thing should work.. given the inverter can handle it. > For real work I have a 2000 Watt pure sinewave 12 V to 230 V one: > https://panteltje.nl/pub/250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG > and a 250 Ah hour lifepo4 battery pack. > Sinewave is better ... > > Also depends how many Watts / current yoy need for that 450 V DC. > Maybe simple switcher ? > > Or you could use a voltage doubler circuit: > > --|>|--------- + > | | > | === > | --- > | | 500 V > |- -AC--| > | | ht > | === > | --- > | | > --|<|-------- - > > simplest solution!I might try a 3V/24V booster and a 24V/380V transformer. Would need additional switching circuit.
Reply by ●July 1, 20232023-07-01
On Sat, 01 Jul 2023 04:39:14 GMT, Jan Panteltje <alien@comet.invalid> wrote:>On a sunny day (Fri, 30 Jun 2023 20:55:08 -0700 (PDT)) it happened Eddy Lee ><eddy711lee@gmail.com> wrote in ><c944dcc8-8559-4276-bf78-b5e534061f1an@googlegroups.com>: > >>Can I use this for 220V input and 380V output? >> >>https://www.ebay.com/itm/255681909221 >> >>This should give me around 400V to 450V full bridge rectified DC. > >450 / sqrt(2) = 318 >318 - 220 = 98 > >Only 100 V extra needed! > >So basically you can use a 220 to 100 V transformer in series with the 220 to get to 318 >So less copper / money / weight needed. >In phase that is :-)Autotransformer mode, but no isolation. One concern about cheapish transformers is copper loss. Some people design transformers with minimal copper and assume a high temperature rise. Signal Transformer used to be famous for selling "soft" transformers; I think they used high temperature varnish. If such a transformer is used to rectify to DC, one may see an unexpected high DC voltage at low loads and bad regulation after that. And figure it might get hot at full load. Rectifying into a capacitor makes all that worse.
