Super Low Profile >130W SMPS ???

Started by D from BC in sci.electronics.design9 years ago 19 replies

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...

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 smps??? But I don't know where yet.. Any suggestions... D from BC myrealaddress@comic.com


Xfmr design for smps

Started by panfilero in sci.electronics.design6 years ago 2 replies

I have a couple questions, one is about identifying smps topology and the 2nd is about the 3rd winding in an example I found. I need to design a...

I have a couple questions, one is about identifying smps topology and the 2nd is about the 3rd winding in an example I found. I need to design a smps that can take Vin: 70V to 105V and output 5V at 1A I've chosen to use the mic9130 http://www.micrel.com/_PDF/mic9130.pdf On the front page of the datasheet there is a "Typical Application" schematic, which is not to far off from what I ne...


transformer design for smps

Started by panfilero in sci.electronics.design6 years ago 20 replies

I have a couple questions, one is about identifying smps topology and the 2nd is about the 3rd winding in an example I found. I need to design a...

I have a couple questions, one is about identifying smps topology and the 2nd is about the 3rd winding in an example I found. I need to design a smps that can take Vin: 70V to 105V and output 5V at 1A I've chosen to use the mic9130 http://www.micrel.com/_PDF/mic9130.pdf On the front page of the datasheet there is a "Typical Application" schematic, which is not to far off from what I ne...


SMPS Long-Term Reliability

Started by Cursitor Doom in sci.electronics.design3 years ago 15 replies

Gentlemen, I have a mountain of vintage scopes to fix up (mid 1970s onwards). Most if not indeed all seem to be suffering from problems with...

Gentlemen, I have a mountain of vintage scopes to fix up (mid 1970s onwards). Most if not indeed all seem to be suffering from problems with the power supply section. These were manufactured at around the time SMPS was taking over from linear, I would imagine, so before they ironed out the bugs in the early SMPS designs. My question is, what were the design flaws in the early power sup...


20 mA LED SMPS buggy

Started by Bernhard Kuemel in sci.electronics.design5 years ago 31 replies

Hi sed! I want to illuminate our hall with 7 white LEDs so we don't have to turn on the main light at night when we want to save energy or...

Hi sed! I want to illuminate our hall with 7 white LEDs so we don't have to turn on the main light at night when we want to save energy or avoid too much light. I started to build a SMPS with a TL494 PWM controller salvaged from an ATX SMPS [2]. Image/video gallery [0]. Before I hook it up to 230V AC (325V rectified) I'm testing it with 12V and something is wrong. When I decrease t...


PSpice Gain/phase model for S/H and quantization in software loop (digital SMPS)

Started by Klaus Kragelund in sci.electronics.design5 years ago 4 replies

Hi I have implemented a digital SMPS in a Cortex M3 controller. The feedback of the SMPS is done using the TL431 and opto coupler...

Hi I have implemented a digital SMPS in a Cortex M3 controller. The feedback of the SMPS is done using the TL431 and opto coupler feedback. The feedback is sampled by the ADC at 10kSa and the sampled values controls the duty-cycle of the SMPS. It is stable, but I would like to simulate the loop in PSPice. The ADC has sample and hold along with quantiziation that affects the gain/phase. Th...


Need the topology for a current to current SMPS, not voltage to voltage SMPS

Started by RobertMacy in sci.electronics.design4 years ago 138 replies

Need a current to current SMPS, with greater than 95% efficiency. and NOT a transformer! because has to be variable. The output will be a...

Need a current to current SMPS, with greater than 95% efficiency. and NOT a transformer! because has to be variable. The output will be a 'defined' current-time profile. Output Power is low, less than 5-10W delivered. Voltage compliance is low, less than 10 Vdc. I'm having difficulty wrapping my brain around potential topologies, need some help here. Anybody ever do this, or have...


3phase PI filter inductors and caps

Started by Jamie Morken in sci.electronics.design10 years ago 3 replies

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...

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 schematic of the filter in ltspice: http://rocketresearch.nekrom.com/new/3phase_PI_filter/3phase-filt...


Proprietary SMPS design tools, what for?

Started by Joerg in sci.electronics.design8 years ago 30 replies

Today I and probably others received the announcement of the umpteenth SMPS "iteractive design simulator", EDesign Studio or whatever from ST....

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 be ..." (all in mass production now). The millisecond you try something unorthodox which I always ...


Rewinding a shorted SMPS transformer

Started by Jim Flanagan in sci.electronics.design8 years ago 9 replies

I have a defective SMPS transformer which I cannot replace and am contemplating rewinding the primary which has shorted internally. I've...

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. Thanks Jim


Surge Protection

Started by Chris in sci.electronics.design1 year ago 36 replies

Hi, What is the best choice currently for protecting SMPS circuitry in the event of surge at mains switch-on? I'm talking about the PSU...

Hi, What is the best choice currently for protecting SMPS circuitry in the event of surge at mains switch-on? I'm talking about the PSU sections of oscilloscopes, typically, so under normal working conditions less than one Amp drawn at 240V (as it is here in europe). I read somewhere that the front end of an SMPS momentarily looks like close to a short circuit resulting in very large ...


SMPS housekeeping electronics power question

Started by Anonymous in sci.electronics.design5 years ago 4 replies

Could some electronics guru please clarify a bit ? How is power to the control electronics circuitry of an SMPS provided -- power for...

Could some electronics guru please clarify a bit ? How is power to the control electronics circuitry of an SMPS provided -- power for controller/PWM module ? Any hints, suggestions or pointers to relevant information would be helpful.


Rewinding an SMPS (again) More Questions

Started by Jim Flanagan in sci.electronics.design8 years ago 4 replies

I made the decision to disassemble an SMPS transformer from a power supply (which I do not have a schematic) for rewinding. My...

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 to attempt to remove the varnish/shellac that the unit was dipped in. This worked well, but not wor...


best book to get started in ac/dc smps power supply design

Started by acan...@wwc.com in sci.electronics.design10 years ago 5 replies

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...

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 use any off-the-shelf SMPS controller ic's, i'd like to pretend im in the 70's and do all this wit...


Snubberinos and SMPS secondary side.

Started by mook johnson in sci.electronics.design8 years ago 6 replies

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...

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 and the the DC output voltage is 150VDC. The switching freq is 100KHz (transformer freq). At ...


Design play/challenge: Phase Shift PWM

Started by Tim Williams in sci.electronics.design2 years ago 63 replies

It finally occurred to me, I've been using these things for so long, yet never built my own. And therefore, never fully understood nor trusted...

It finally occurred to me, I've been using these things for so long, yet never built my own. And therefore, never fully understood nor trusted what the documentation says (or hides!). So here's the challenge: Design a phase shift PWM controller. Example applications: Full bridge forward converter (SMPS, UPS, motor control, etc.) Frequency-locked, resonant systems (resonant SMPS, in...


Switchin Bitchin Audio Amplifier

Started by D from BC in sci.electronics.design9 years ago 61 replies

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...

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 <


Rudy Severns Publication of 100+ SMPS topologies

Started by Klaus Kragelund in sci.electronics.design4 years ago 4 replies

Hi I am looking for the Rudy Severns publication in which he supposidely lists all sorts of SMPS topologies. It could be this...

Hi I am looking for the Rudy Severns publication in which he supposidely lists all sorts of SMPS topologies. It could be this one: 12.Severns, SWITCHMODE TOPOLOGIES - MAKE THEM WORK FOR YOU, Intersil applications note A035, February 1980 From: http://powerelectronics.com/power-electronics-systems/rudy-severns-lifetime-achievement-award-wi nner It should be the one with 100+ topologie


Million Dollar Universal Outlet

Started by Anonymous in sci.electronics.design3 years ago

Follow-up on "Google's Million Dollar Inverter" Jan: want universal DC Mike: require UL & NEC approval. Me: want everything For...

Follow-up on "Google's Million Dollar Inverter" Jan: want universal DC Mike: require UL & NEC approval. Me: want everything For $1,000,000, we will give you 10,000 smart outlets with build-in smps/~smps. It will have IEEE 802.15.4 RF link as well, +200 = 0V to 200V DC ~120 = 0V to 120V AC 0A to 15A programmable, default to 1A +---------+ | | | | +200 +200 | ___ ___ | ...


Turning on Mac Mini SMPS power supply?

Started by notme in sci.electronics.design8 years ago 5 replies

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...

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 cars and have tied the Mini's iSense line low (using pull-down resistor) but they're not using the ...