Xfmr design for smps

Started by panfilero in sci.electronics.design9 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.design9 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.design5 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.design8 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.design8 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.design7 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...


series input parallel output SMPS

Started by bitrex in sci.electronics.design2 years ago 48 replies

I have a bunch of small 12 volt input ATX SMPS power modules each rated for 120 watts. about 14 bux each, surplus. Fanless 200 watt modules are...

I have a bunch of small 12 volt input ATX SMPS power modules each rated for 120 watts. about 14 bux each, surplus. Fanless 200 watt modules are harder to come by and significantly more expensive. I'd like to slave two together to get ~200 watts out, with the inputs in series. 24 volt 8 amp power bricks are pretty common. I found this whitepaper on voltage balancing SMPS inputs in serie...


Surge Protection

Started by Chris in sci.electronics.design4 years 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.design8 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.


AC-fed SMPS topologies or the lack thereof

Started by Piotr Wyderski in sci.electronics.design2 years ago 30 replies

Why there seem to be no AC-fed SMPS topologies? Google is surprisingly silent about that. There are some attempts to bulid a bridgeless PFC, but...

Why there seem to be no AC-fed SMPS topologies? Google is surprisingly silent about that. There are some attempts to bulid a bridgeless PFC, but they still have the high-voltage electrolytic capacitor in the middle and in most cases they do not address the inrush current issues at all, as the PFC is a more or less typical buck, i.e. a series connection of L-> D-> C. The lack of this storage c


Design play/challenge: Phase Shift PWM

Started by Tim Williams in sci.electronics.design5 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...


Rudy Severns Publication of 100+ SMPS topologies

Started by Klaus Kragelund in sci.electronics.design6 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.design6 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 | ___ ___ | ...


add one resistor, quiet ugly smps ADC noise

Started by Winfield Hill in sci.electronics.design2 years ago 46 replies

Switching converters and sensitive SAR ADCs don't go well together. Consider a 3.7 Li-ion to 14V boost converter, switching 400mA current...

Switching converters and sensitive SAR ADCs don't go well together. Consider a 3.7 Li-ion to 14V boost converter, switching 400mA current ramps at 500kHz. Add a 16-bit ADC, which takes 2us to sampling a signal, and completes its conversion in 15us. A large fraction of the ADC samples are degraded by SMPS switching noise. The boost converter, a TPS61040, has an enable input, but if...


Need suggestions for SMPS ICs for a DIY Lab power Suipply

Started by hrh1818 in sci.electronics.design7 years ago 3 replies

I am looking for suggestions for SMPS ICs for a DIY Lab Power Supply. Required outputs are: Output 1 Adjustable over the range of 2 to 15...

I am looking for suggestions for SMPS ICs for a DIY Lab Power Supply. Required outputs are: Output 1 Adjustable over the range of 2 to 15 VDC 0 to 2 amps load current Adjustable current limiting 18 to 24 VDC input Output 2 Adjustable over the range of -2 to -15 VDC 0 to 2 amps load current Adjustable current Limiting 18 to 24 VDC input Output 3 5 ...


smps controller IC datasheet?

Started by DaveC in sci.electronics.design7 years ago 5 replies

oem power supply, 31.5 vdc 1.5 A. I want to change the output to 24 v. There is one 8-pin IC, labeled: 230D1 PUICO I don't...

oem power supply, 31.5 vdc 1.5 A. I want to change the output to 24 v. There is one 8-pin IC, labeled: 230D1 PUICO I don't see a datasheet anywhere for this.? Any ideas? Thanks, Dave


DC DC Converter 100V to 10V

Started by panfilero in sci.electronics.design9 years ago 15 replies

can anyone suggest a smps topology or an off the shelf component that could convert 100V DC (@ .2A) to 10V DC out? much thanks

can anyone suggest a smps topology or an off the shelf component that could convert 100V DC (@ .2A) to 10V DC out? much thanks


Question on PFC front ends for SMPS

Started by Ralph Barone in sci.electronics.design9 years ago 3 replies

Do PFC circuits inherently result in unity power factor or can they be "fudged" to produce a leading or lagging power factor?

Do PFC circuits inherently result in unity power factor or can they be "fudged" to produce a leading or lagging power factor?


EMC Screening Query

Started by Syd Rumpo in sci.electronics.design5 years ago 9 replies

I'm working with some equipment which contains a commercial SMPS which has been enclosed in a stainless steel box to screen it. However, we...

I'm working with some equipment which contains a commercial SMPS which has been enclosed in a stainless steel box to screen it. However, we still get some noise from it, experiments suggest that this is radiated. The noise interferes with some sensitive signal conditioning and manifests as noise on a channel at half the switching frequency which is about 130kHz, although messing about ...


Superior PCB assembly workmanship

Started by bitrex in sci.electronics.design4 years ago 10 replies

Dig the superior workmanship on the underside of this Chinese built "eBay Special" SMPS bench supply! http://tinyurl.com/zzx5ayn --...

Dig the superior workmanship on the underside of this Chinese built "eBay Special" SMPS bench supply! http://tinyurl.com/zzx5ayn -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/