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SMPS
Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 261 threads matching "smps"
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The most relevant threads are listed first
SMPS circuit need
Ivan Matacic - 2008-05-17 17:51:00
Hi everyone!
I need to get stabilized 6V/2A from a variable power supply (SLA battery)
with about 5V (empty) to 8V (full). What is the best solution for do this?
Some kind of SMPS?
--
www.elektronka.com
...
Super Low Profile >130W SMPS ???
D from BC - 2008-11-03 18:52:00
I'm looking for the flattest > 130W smps's around for study.
Any output V.
Offline isolation type. (Vin=120VAC 60Hz)
Open frame.
Here's the tough part: 8mm max.profile height
The smps will be bolted to a heat sink which is not part of the total
height.
Perhaps a flat screen tv or monitor...Re: POWER SUPPLY FIRE
Ross Herbert - 2009-02-20 19:45:00
On Fri, 20 Feb 2009 13:05:36 -0800 (PST), osr@uakron.edu wrote:
:Ok, I cant post pics, creative lawyering.
:
:It was not the SMPS, focus is now off the clients unit and onto
:operational procedures involving fuses.
:
:Steve
Can you say in what regard the focus is now on fuses?
As I ...Rewinding a shorted SMPS transformer
Jim Flanagan - 2010-02-17 17:24:00
I have a defective SMPS transformer which I cannot replace and
am contemplating rewinding the primary which has shorted
internally. I've rewound 60Hz power transformers in the past with
no problems. What are some pitfalls that I might run into when
attempting this.
Any help is appreciated...SMPS feedback loop phase and gain margin
Jamie Morken - 2008-05-21 18:06:00
Hi,
What is a good way to increase the stability of a SMPS feedback loop?
I have a SMPS that uses this algorithm:
if inductor current > current_limit, pulse off
Duty cycle = ((desired voltage - current voltage) * gain) - (Inductor
current * gain2)
I am not sure how to put in the anal...Isolation Transformer Substitute
D from BC - 2008-02-10 12:53:00
Anybody know where I can get a cheapo 115VACin to ~163VDCout ~200W
smps with good isolation?
The idea is to dodge buying a ~200W isolation transformer.
And to avoid doing something goofy like:
E*bay 12V smps + E*bay automotive inverter with 'Pure Sine'.
D from BC
British Columbia
Cana...Switchin Bitchin Audio Amplifier
D from BC - 2009-02-01 22:16:00
Is there a company that makes a totally switchin bitchin amplifier?
What I mean is, smps + class D audio amp.
Perhaps a 100W smps + stereo class D that fits in the palm of my
hand??
Com'on...it's gotta be doable.
Switchin Bitchin Amp < ...best book to get started in ac/dc smps power supply design
acannell@wwc.com - 2008-04-08 11:27:00
i'd like to learn how to make my own AC/DC switching power supply.
i'd like to design something that just WORKS. it DOESN'T need to be
production ready, small, EMI-quiet, high voltage, or high current. Im
thinking 12VDC at 3A from 110VAC. It does need to be safe and
reliable.
i dont want to...Re: Vaporizing PCB Traces
D from BC - 2008-01-13 14:03:00
On Sun, 13 Jan 2008 08:54:06 -0800 (PST), a7yvm109gf5d1@netzero.com
wrote:
> On Jan 13, 3:24 am, D from BC wrote:
> > Yeah I know.
> > I just got socks and stuff for Christmas.
> > Nothing practical like an isolation transformer :(
>
> Too bad you're not closer, I picked up a nice 3 ...Re: Simple buck converter schematics/circuits?
petrus bitbyter - 2008-06-16 07:37:00
"terryc" schreef in bericht
news:pan.2008.06.16.02.36.33.57084@woa.com.au...
> Can/would anyone/spomeone post a link to some simple buck converters that
> I could build at home (simple hand soldering, not surface mount)?
>
> I've built simple 78/79/etc regulators in the past and want ...Re: 9V NiMH batteries, high capacity, any good deals?
Phil Allison - 2009-10-27 10:02:00
"_" = a bleeding idiot
>
> Some time ago i built a 9v source out of an odd-sized cell (2/3 c maybe?)
> and one of those little smps kits. After I re-located the cap to fit
> inside the toroid it and the cell just fit in a 9V space. The cell was
> something like 850 mAh - probably ...Turning on Mac Mini SMPS power supply?
notme - 2009-07-17 23:33:00
The Mac Mini ac adapter is off until the Mini commands it to turn on via the
iSense pin in the power connector.
What does the iSense pin need in order to start the external SMPS ac adapter?
Pull low? High (5v)? Or...?
Googling turns up lots of info on people who have used the Mini in car...synchronizing SMPS for ADC sampling noise reduction
Jamie Morken - 2008-04-04 05:02:00
Hi,
I am working on a switcher with ADC sampling at the same frequency as
the main switcher PWM frequency, they are already synchronized to reduce
noise when sampling the ADC. There are also several small flybacks
(10watts at 12Volts output) on the board, I am thinking of syncing their
PWM...Re: push pull / half and full bridge waveforms
WJLServo - 2008-01-29 16:08:00
On Jan 29, 9:59=A0am, reggie wrote:
> Hi all,
>
> Does anyone know where to get actual or accurate voltage and current
> waveforms for push pull, half bridge and full bridge PSU topologies
> with centre tapped secondary's.
>
> I would like voltage and current waveforms for: transfor...Re: POWER SUPPLY FIRE
Ross Herbert - 2009-02-18 04:10:00
On Tue, 17 Feb 2009 16:57:25 -0800, Archimedes' Lever
wrote:
:On Tue, 17 Feb 2009 10:59:10 -0800 (PST), makolber@yahoo.com wrote:
:
:> x-no-archive:
:> >
:> > If they left the 30KV supply on for an extended time, would static
:> > electricity draw these metal powders into the power su...SMPS oddities
Bitman - 2008-02-24 06:25:00
Hi all,
I've been studying SMPSs for a while out of personal interest, and I stumbled
upon an old schematic for a discrete component-based SMPS:
http://bitman3.altervista.org/SMPS.png
As I understand it, this is a self-oscillating SMPS operating in current mode.
T302 is the main switche...A question on a typical filter circuit after rectifier in SMPS design
Myauk - 2010-01-12 22:20:00
Hi all,
As I am studying a typical power supply circuit used in a product and
I see two 10 uF capacitors used in series after the rectifier circuit.
I also see 4 x 470k ohms resistors used together with the above
mentioned 10uF capacitors (please see below).
|---------------|
| |
> |
...Battery Charger SMPS, How'd they do it?
RogerN - 2008-10-05 10:34:00
I'm wanting to come up with a battery charger that is basically a SMPS with
microprocessor controlled voltage and current limiting. Here's a link to
something similar:
http://www.amainhobbies.com/product_info.php/cPath/2_389_390/products_id/18362
So, how do you think they are getting 250W...Re: POWER SUPPLY FIRE
Ross Herbert - 2009-02-19 19:41:00
On Thu, 19 Feb 2009 13:28:56 -0500, "Paul E. Schoen" wrote:
:
:"Ross Herbert" wrote in message
:news:h1fqp4pu7t9fduf62725ia06f9t7d4mv08@4ax.com...
:>
:> I never saw anything which indicated that the 20A CB tripped. In fact I
:> think the OP said it didn't iirc.
:
:From the OP's fi...Smps Ferrites, Frequency and Loss
D from BC - 2008-03-04 14:58:00
Ugh...I have to change a non-isolated 700khz Cuk converter into an
isolated version.
Safety reasons.
Currently, the power inductors feel like 30C. Nice @~100W transfer.
I suspect, popping in an isolation transformer running at 700khz will
create a humongous drop in efficiency.
Transforme...Re: looking for class D amplifier
miso@sushi.com - 2009-09-16 15:08:00
On Sep 16, 9:39=A0am, Joerg wrote:
> m...@sushi.com wrote:
>
> [...]
>
> > Regading stuff I made that shipped, I don't know the insides anymore.
> > I'm long gone. When I was there, there were few issues with my
> > products, as I stated earlier. A quick check of Avnet (which mos...What is the best topology for an offline SMPS 330W?
Hammy - 2009-03-12 16:52:00
90VAC to 140VAC INPUT, 33Vdc out 10A.
Half-Bridge Push-Pull Converter or two switch forward.
...Proprietary SMPS design tools, what for?
Joerg - 2009-09-01 12:09:00
Today I and probably others received the announcement of the umpteenth
SMPS "iteractive design simulator", EDesign Studio or whatever from ST.
I am not even going to try it. I've hung up on those things a long time
ago, after WebBench from National flagged the third of my designs as
"cannot ...Death of Silicone Steel Transformers in Consumer Electronics?
D from BC - 2009-01-26 16:17:00
Tech dies...
CRT..dead.
HD DVD ..dead.
Floppy..dead.
But is silicon steel transformers in consumer electronics...dead?
Are block of steel wallwarts disappearing?
Consider: My cellphone charger feels like an empty plastic box.
So...
I wonder which branch of smps is dominant in consumer elec...3phase PI filter inductors and caps
Jamie Morken - 2008-04-15 23:05:00
Hi,
I am making a filter between a SMPS and a 3phase brushless DC
generator, the SMPS draws pulses of current at 200kHz, with a
peak draw of 12Amps. The rectified voltage of the brushless DC
generator peaks at 385VDC. The SMPS rise/fall switching time is
will about 20ns.
here is the sche...Re: Simple temp adjust for peilter module
whit3rd - 2010-02-06 13:51:00
On Feb 6, 8:56=A0am, Jim Thompson wrote:
> On Sat, 06 Feb 2010 09:47:25 -0500, Spehro Pefhany
> > PWM isn't so good for Peltiers because it decreases the already
> > miserable efficiency due to I^2*R losses. Less than 10-20% ripple is
> > recommended.
> Use a buck-style converter (w...Where's http://henry.fbe.fh-darmstadt.de/smps_e/smps_e.asp gone?
Ian - 2008-01-08 16:31:00
Used to be some handy SMPS calculators here, but it's been
absent for a while - anyone know if it's moved someplace else?
--
Ian
"Tamahome!!!" - "Miaka!!!"
...How's This Smps Patent?
D from BC - 2008-05-02 22:25:00
It's patent number 6343021
Or see:
http://www.google.com/patents?id=wvQKAAAAEBAJ&dq=6343021
I found this patent a nice read. Not too 'patentese'.
I still consider myself a newbie at smps design but doesn't this look
like a 'neat' looking topology?
Claims:
Neat unity power factor.
Simpler...Re: Which PCB-mounted SMPS brands are good?
JosephKK - 2009-11-13 06:56:00
On Thu, 05 Nov 2009 14:48:46 -0800, Joerg
wrote:
> Phil Hobbs wrote:
> > Joerg wrote:
> > > John Larkin wrote:
> > > > On Thu, 05 Nov 2009 07:55:44 -0800, Joerg
> > > > wrote:
> > > >
> > > > > Herman wrote:
>
> [...]
>
> > > > > > I had a problem with PC mounted transfo...Re: looking for class D amplifier
krw - 2009-09-16 20:02:00
On Wed, 16 Sep 2009 13:28:50 -0700, Joerg
wrote:
> miso@sushi.com wrote:
> > On Sep 16, 9:39 am, Joerg wrote:
> > > m...@sushi.com wrote:
> > >
> > > [...]
> > >
> > > > Regading stuff I made that shipped, I don't know the insides anymore.
> > > > I'm long gone. When I was th...Rewinding an SMPS (again) More Questions
Jim Flanagan - 2010-02-20 09:45:00
I made the decision to disassemble an SMPS transformer from a power
supply (which I do not have a schematic) for rewinding. My pre-disassembly
electrical tests showed that the primary had an internal short. During
my disassembly process I soaked the transformer in a strong
paint stripper t...Anyone heard of DNA / genome lately? He used to be around here.
powerampfreak - 2009-01-20 01:41:00
Long time since heard of DNA / Genome? Where can he be?
He used to have a lot of good SMPS and class D audio amp stuff to
discuss!
Regards
Steve
...Re: Switching power supplies and overcurrent protection
Robert Latest - 2009-12-06 15:44:00
["Followup-To:" header set to sci.electronics.design.]
oparr@hotmail.com wrote:
> > Depends on your application. If those spikes are "normal" in your
> > scenario and not an indicator of doomsday being around the corner then
> > constant current may be your ticket.
>
> App is low power DC...Re: I feel sorry for all you [in your face] atheists on SED
D from BC - 2009-10-17 04:01:00
On Fri, 16 Oct 2009 14:57:51 -0700 (PDT), brent
wrote:
> On Oct 16, 5:46 pm, brent wrote:
> > On Oct 16, 5:36 pm, D from BC wrote:
> >
> >
> > > Can you explain how the story of Noah's arc makes you smarter?
> >
> > > D from BC
> > > Amateur smps designer.
> > > Brit...Using a Ramdrive with LTSpice
D from BC - 2010-01-17 16:09:00
I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
(I have 8G) to be used as a ramdrive for the raw file created during
an LTSPICE simulation..
Conclusion
Yup. It's faster.
Helps with long smps simulation.
...specifications
Michael - 2009-05-14 13:29:00
Here is the observation I would like to share with EE community.
I am trying to optimize the SMPS I am working on, looking into
switching losses. I tried STP190N55LF3 instead of IRFS3206 (supposed
to switch faster). NO WAY!
The former tuns off in 70+ns, the latter - in less than 20.
STMicro spe...Re: Proprietary SMPS design tools, what for?
krw - 2009-09-09 19:46:00
On Wed, 09 Sep 2009 03:21:32 -0400, "Michael A. Terrell"
wrote:
>
> krw wrote:
> >
> > It's not *that* big of a hose.
>
>
> I don't even want to know how you keep your hose up. ;-)
Concrete.
...Re: Watt ever happened to Watt Sun anyway?
Jasen Betts - 2008-12-21 00:09:00
On 2008-12-19, Eeyore wrote:
>
>
> Tim Williams wrote:
>
> > I'm going to build what I'm pretty sure is the biggest Joule Thief
>
> What does that mean ? You've broken the Laws of Thermodynamics ?
It's a blocking oacillator SMPS for driving LEDs from ...Snubberinos and SMPS secondary side.
mook johnson - 2009-08-01 12:48:00
How do you guys implement snubbers on the secondary side of a SMPS
transformer
The primary is fullbridge and the power level is 150W. I know FB is
overkill for this but this is what I have in front of me. The secondary is
centertapped with a standard common cathode two diode FW rectifier ...A More Efficient Bridge Rectifier?
D from BC - 2010-02-09 20:06:00
My offline smps design has 3 parts making the most heat.
A power diode, a mosfet and a bridge rectifier.
I'm interested in any cookbook designs that replaces a bridge rectifier.
Any pointers?
--
D from BC
British Columbia
...