Forums

Power supply for Buck dc-dc

Started by Unknown January 10, 2013
On Friday, January 11, 2013 1:02:04 AM UTC-2, contr...@gmail.com wrote:
> Hi, Please, could I use a half-bridge diode circuit to power this buck po=
wer supply ? http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-= constant-power-supply-module-/190649685203?pt=3DLH_DefaultDomain_0&hash=3Di= tem2c639b54d3 This power supply accepts 62VDC input, so if I use one rectif= ier diode to rectify 120Vac home's power (decay to ~ 54Vdc), it will work ?= 120Vac -> 1 rectifier diode -> 54Vdc -> Buck DC-DC power supply. Thanks. And what about this ? Vrms=3DVpeak/2 Vdc=3DVpeak/Pi http://en.wikipedia.org/wiki/Rectifier
On Fri, 11 Jan 2013 08:34:35 -0800 (PST), contracer11@gmail.com wrote:

>On Friday, January 11, 2013 1:02:04 AM UTC-2, contr...@gmail.com wrote: >> Hi, Please, could I use a half-bridge diode circuit to power this buck power supply ? http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-constant-power-supply-module-/190649685203?pt=LH_DefaultDomain_0&hash=item2c639b54d3 This power supply accepts 62VDC input, so if I use one rectifier diode to rectify 120Vac home's power (decay to ~ 54Vdc), it will work ? 120Vac -> 1 rectifier diode -> 54Vdc -> Buck DC-DC power supply. Thanks. > >And what about this ? >Vrms=Vpeak/2 >Vdc=Vpeak/Pi >http://en.wikipedia.org/wiki/Rectifier
The RMS voltage of a waveform is the DC voltage which would heat a load the same amount as the waveform under question. For example, since Vrms = Vpeak/2 for a half-wave rectified sine wave, that signal, with an amplitude of 2 volts, would heat a load the same amount as 1 volt, DC would. The average DC is the number you'd get if you took a great number of equally time-spaced voltage samples from the start of one half-sine pulse to the start of the next, added them all up, and then divided that sum by the number of samples. In the end, that quotient would be equal to Vdc = Vpeak/pi. -- JF
On Fri, 11 Jan 2013 16:30:28 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

>On a sunny day (Fri, 11 Jan 2013 09:56:17 -0600) it happened John Fields ><jfields@austininstruments.com> wrote in ><q0d0f899un8imu5cihpgocapvp2p0vcaq7@4ax.com>: > >>On Fri, 11 Jan 2013 15:29:24 GMT, Jan Panteltje >><pNaonStpealmtje@yahoo.com> wrote: >> >>>On a sunny day (Fri, 11 Jan 2013 06:41:26 -0800 (PST)) it happened >>>contracer11@gmail.com wrote in >>><012a44f1-f4e8-4503-a682-e0030c467f35@googlegroups.com>: >>> >>>>On Friday, January 11, 2013 1:02:04 AM UTC-2, contr...@gmail.com wrote: >>>>> Hi, >>>>> >>>>> Please, could I use a half-bridge diode circuit to power this buck power = >>>>supply ? >>>>> >>>>> http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-constant-po= >>>>wer-supply-module-/190649685203?pt=LH_DefaultDomain_0&hash=item2c639b54= >>>>d3 >>>>> >>>>> >>>>> >>>>> This power supply accepts 62VDC input, so if I use one rectifier diode t= >>>>o rectify >>>>> >>>>> 120Vac home's power (decay to ~ 54Vdc), it will work ? >>>>> >>>>> >>>>> >>>>> 120Vac -> 1 rectifier diode -> 54Vdc -> Buck DC-DC power supply. >>>>> >>>>> Thanks. >>>> >>>> >>>>Is there any way to bypass transformer&#2013266100;s usage to power this buck ? >>>>It&#2013266100;s only for school work, not for real usage... >>> >>>No. >> >>--- >>Right. >>--- >> >>>And if you single phase rectify 120V AC you still get 120 /2 * sqrt(2) = 85 V DC peak. >> >>--- >>No, you get 120 * sqrt(2) = 170VDC, but you'll need twice the >>capacitance for the same ripple you'd get with full-wave >>rectification. > >Oops! I must be getting old.... >Thanks for the correction... >:-)
--- My pleasure! ;) -- JF
On Fri, 11 Jan 2013 06:54:58 -0800 (PST), George Herold
<gherold@teachspin.com> wrote:

>On Jan 11, 6:36&#2013266080;am, contrace...@gmail.com wrote: >> On Friday, January 11, 2013 4:05:27 AM UTC-2, Tim Wescott wrote: >> > On Thu, 10 Jan 2013 19:02:04 -0800, contracer11 wrote: >> >> > > Hi, >> >> > > Please, could I use a half-bridge diode circuit to power this buck power >> >> > > supply ? >> >> > >http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-constant- >> >> > power-supply-module-/190649685203? >> >> > pt=LH_DefaultDomain_0&hash=item2c639b54d3 >> >> > > This power supply accepts 62VDC input, so if I use one &#2013266080;rectifier diode >> >> > > to rectify 120Vac home's power (decay to ~ 54Vdc), it will work ? >> >> > > 120Vac -> 1 rectifier diode -> 54Vdc -> Buck DC-DC power supply. Thanks. >> >> > Oi. &#2013266080;Wrong in so many ways. &#2013266080;Where should we start? >> >> > The short answer is, given what you know, don't even try. &#2013266080;Learn more >> >> > about electronics first, then start playing with power from the wall when >> >> > you're not going to kill yourself, burn your house down, or shock your >> >> > kids silly. >> >> > If you don't understand why you can't connect your equipment straight to >> >> > the wall power without isolation, then you need to learn more about >> >> > electronics and about how houses are wired for power before you can >> >> > safely proceed to play with 120V. &#2013266080;While it isn't always instantly >> >> > LETHAL!!!, getting a shock from 120V always hurts a lot, it _can_ kill >> >> > you on a bad day, and there's a lot of ways that you can build your >> >> > equipment so that it doesn't kill you or your loved ones, but still burns >> >> > down your house. >> >> > Get yourself a copy of the ARRL manual. &#2013266080;They've got whole chapters in >> >> > there on power supply design, electric safety, how houses in North >> >> > America are wired, and all that useful stuff. &#2013266080;Then READ IT. &#2013266080;If you >> >> > don't feel you understand what it says, don't mess around with 120V -- >> >> > just find a wall-wart that delivers what you need, and be happy. >> >> > -- >> >> > My liberal friends think I'm a conservative kook. >> >> > My conservative friends think I'm a liberal kook. >> >> > Why am I not happy that they have found common ground? >> >> > Tim Wescott, Communications, Control, Circuits & Software >> >> >http://www.wescottdesign.com >> >> Yesterday I took my digital multimeter, insert a 1N4007 diode in power's home, and I got 52Vdc from that !- Hide quoted text - >> >> - Show quoted text - > >That makes no sense to me. Have you been zapped by 120 Vac yet? >Keep one hand in your pocket.
*BACK* pocket.
>You can buy a nice linear power supply from Mastek ~50V @3A for a bit >more than $100.
Wall warts are cheaper and even safer. 5V@2A, or so, won't get a newb in too much trouble and will be quite useful while learning.

>> Get yourself a copy of the ARRL manual. They've got whole chapters in >> >> there on power supply design, electric safety, how houses in North >> >> America are wired, and all that useful stuff. Then READ IT. If you >> >> don't feel you understand what it says, don't mess around with 120V -- >> >> just find a wall-wart that delivers what you need, and be happy. >> >> >> >> -- >> >> My liberal friends think I'm a conservative kook. >> >> My conservative friends think I'm a liberal kook. >> >> Why am I not happy that they have found common ground? >> >> >> >> Tim Wescott, Communications, Control, Circuits & Software >> >> http://www.wescottdesign.com > > Yesterday I took my digital multimeter, insert a 1N4007 diode in power's > home, and I got 52Vdc from that !
Somewhere I have a 230VAC theraputic lamp/heater - it used to have a UV ray tube and used a pair of heater bars with combined rating of 115VAC to act as ballast for the UV tube and provide Theraputic IR rays. When the UV tube is not required (or missing) the heater bars are fed by a hefty rectifier diode, by clipping the half cycles; the power delivered to the heater bars is halved. Unfortunately, with a buck converter; it doesn't work like that - the input filter/reservoir electrolytic will charge to 1.414 x 110V. Of course with a buck regulator the transistor is in series with the load, so when the severely over-volted transistor fails short-circuit - the load should provide a short, but spectacular fireworks display.
On Thu, 10 Jan 2013 19:02:04 -0800 (PST), contracer11@gmail.com wrote:

>Hi, >Please, could I use a half-bridge diode circuit to power this buck power=
supply ?
>http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-constant-p=
ower-supply-module-/190649685203?pt=3DLH_DefaultDomain_0&hash=3Ditem2c639= b54d3
> >This power supply accepts 62VDC input, so if I use one rectifier diode =
to rectify=20
>120Vac home's power (decay to ~ 54Vdc), it will work ?=20 > >120Vac -> 1 rectifier diode -> 54Vdc -> Buck DC-DC power supply.=20 >Thanks.
No! Unsafe. You will destroy the power supply. It may burn up or explode. It may maim or kill you. Is this clear enough? Tim warned you off, you are not fit to make a guess on this. >8=3D((
"josephkook"

No!  Unsafe.  You will destroy the power supply.  It may burn up or
explode.  It may maim or kill you.

Is this clear enough?

Tim warned you off, you are not fit to make a guess on this.


** And I warned him of the same, a full THREE hours earlier.

   All you are is very a late echo and bad fart smell.

   Cunt head.



....  Phil 


On Wed, 16 Jan 2013 23:12:38 +1100 "Phil Allison" <phil_a@tpg.com.au>
wrote in Message id: <alnjpuF3svhU1@mid.individual.net>:

> >"josephkook" > >No! Unsafe. You will destroy the power supply. It may burn up or >explode. It may maim or kill you. > >Is this clear enough? > >Tim warned you off, you are not fit to make a guess on this. > > >** And I warned him of the same, a full THREE hours earlier. > > All you are is very a late echo and bad fart smell. > > Cunt head.
I know time flies when we're having fun, but it was actually five days ago.
JW wrote:
> > On Wed, 16 Jan 2013 23:12:38 +1100 "Phil Allison" <phil_a@tpg.com.au> > wrote in Message id: <alnjpuF3svhU1@mid.individual.net>: > > > > >"josephkook" > > > >No! Unsafe. You will destroy the power supply. It may burn up or > >explode. It may maim or kill you. > > > >Is this clear enough? > > > >Tim warned you off, you are not fit to make a guess on this. > > > > > >** And I warned him of the same, a full THREE hours earlier. > > > > All you are is very a late echo and bad fart smell. > > > > Cunt head. > > I know time flies when we're having fun, but it was actually five days > ago.
But that's 35 days on Phil's dog of a planet!
"JW"
> "Phil Allison" >> >>"josephkook" >> >>No! Unsafe. You will destroy the power supply. It may burn up or >>explode. It may maim or kill you. >> >>Is this clear enough? >> >>Tim warned you off, you are not fit to make a guess on this. >> >> >>** And I warned him of the same, a full THREE hours earlier. >> >> All you are is very a late echo and bad fart smell. >> >> Cunt head. > > I know time flies when we're having fun, but it was actually five days > ago. >
** Huh ??? I replied to the OP within 12 minutes, Tim came along 3 hours later. You totally stupid ? ... Phil