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55 Threads found on edaboard.com: Flyback Design High Voltage
Hi I want to design high voltage source. I need to obtain source with variable frequency output of high alternating voltage. The most desired circuit is this one: flyback Transformer + 555/MOSFET Driver = high voltage but here are the questions: (...)
hi u can make it very easily use a flyback transformer anda simple oscilator with two transistor or with a 555 IC then make a ac voltage with your battery with a frequency about 20khz(try the to find best frequency) then on the other side of transformer change your 600v ac voltage to dc with 1n4007 diodes.
Hi, For the 200W use a half bridge forward converter and for the 1000W one use a full bridge forward converter. A flyback design is just possible for the 200W but this is on the limit so I would not recommend it for a first try. Start here for downloading the magnetics design software: Then follow this link or the
The HF pulse needs to go into the workpiece and not back into the source. So you will want a narrow pulse and a lot of source inductance. I would check that your DC source indeed has that kind of inductance. You might prefer to deliver the HF to the torch directly so that the welding cable inductance is in your favor rather than against.
to generate high voltage i thiunk the normal flyback topology is not sufficeint as u will ned a huge number of winding in secondary but as in TV horizentalor as in Spark ignition there's a good ways to generate those hiugh voltages this way depends on resonance , wher the charged primary inductor in (...)
whats the difference with an TV flyback transformer and with a motorcycle ignition coil, anyone? im sure those transformers are designed for high voltage output...
A usual isolated flyback SMPS with a casacde rectifier should do. Add a passive filter or preferably a linear post-regulator to reduce ripple.
hello friends I designed one flyback circuit, whose input varies from 70-330 dc, i want to maintain output voltage constant 24V first i tested input voltage at 50v dc, output voltage is regulating. problem is Mosfet(IRFP460 500v,20A) is over heating, with in 10-15 sec, i used big size heat sink. when i (...)
Hey all. I have a quick question: is it possible to build an offline 5W flyback converter? I know the flyback is ideal for low powers. I want to build a small offline converter to power some stuff that I am working on ( mainly other control ICs, OPAMPS, etc). How popular is it to build a 5W converter? Would most people just use a 60hz line transfor
Hi, If it's in such small voltage range, why use flyback, and not dedicated buck-boost converters. There are tons available, check those from Maxim, Dallas and Linear. Hope this helps. Tahmid.
My dear friend, I thank your intention in replying. I have some experience in low frequency switching power supplies up to 50 KHz. I have designed some of them using the old and fantastic TL494, and built my own tranformers. This device works at 132 KHz and need much more experience. Why flyback converter ? because this chip
Dear prasad Hi I know exactly what you want to do . why boost converter ? why not an H bridge ? or a forward converter ? or even a flyback ? Best Wishes Goldsmith
I guess you are talking about a flash lamp trigger transformer? They are designed for a specific voltage range. You also shouldn't supply the trigger transformer with a much higher voltage, because it can involve isolation breakdown on long terms. flyback converters can be used with (...)
You can use a flyback topology to get multiple outputs very easy. Bastos
Hello Jav2xar, Sorry, but I didn't get any schematic. It seems that this monitor, or at least some batches of it, have a design problem in the high voltage/flyback Tr.... I have two of this an both failed in the same way. The representative here has repaired a lot of this, also failed in the same way. Best regards P.S. (...)
Forward or flyback convertors are your solution, but I think for your application Forward converter is better selection, thids due to high level of output current. also I think it is better to use integrated switchers available from International Reactifier : due to lower voltage and higher efficiency. another (...)
linear tech made an application note about building a laser power supply using one of their flyback devices. it's about 2kv/20mA if I recall but I'm sure you could change that to higher vout by using a different transformer. take a look at the lt page, maybe their schematic will work for you.
Depending on power you would like to convert, for low current (<200mA) you can use charg-pump configuration, for higher currents there is Boost/Step-up method. Another method is flyback / Isolated / Transformer... More you can read here: and here:
The task is not as difficult as it seems. I have some experience with building flyback converters up to 150W so I would use flyback smps to power that LED matrix.
I've finished a switching power supply module but it runs so bad! Ripple at output is too high, about 1V-1.5V. ( My output voltage is 5V) I used flyback Converter Topology. Major components include: - flyback Transformer use core type ERR35L - Mosfet N channel type 2SK1464 - PWM is UC3845B - Output diode is CTB-34D Pleas
how do you reduce the leakage inductance i a transformer, specifically for SEPIC or flyback where the needed magnetizing inductance is too large. thnks!:D
hi fiends i am confusing in controling of a flyback aknowledge about it is low and i have to learn it in one week,i want your help,if possible :D best regards
Hi all, as I've did for other paper I've make a deep analysis about this one: Robert Erickson, Michael Madigan, Sigmund Singer, ?design of a Simple high-Power-Factor Rectifier Based on the flyback Converter? the most interesting things is that using flyback topology we can keep two goal, the PFC behaviour (...)
Hello fory, A flyback topology will get you very close to your design aims, use something like a UC3843 IC or something similar together with a low on resistance switching FET with a breakdown voltage of about 600V will be OK, remember that you must have at least twice the input voltage withstand plus a bit for spikes. You (...)
I have designed a flyback smps with 1W output power 5V@1A When i am applying a load of 250mA , it is generating high frequency noise of abt 200mV peak at 5V output. I have used 10nF, 100nF ceramic capacitors at output but of no use. How can i reduce the noise. Also my transformer makes lot of noise, my feedback loop incorporates 1nF (...)
why the Zener diode is necessary I don't knowIt's flyback topology, wthout the zener, you would cut the output voltage. As a problem, the leakage inductance energy depends on converter output current, the RCD snubber creates permanent losses even with no output load. Some designs are also combining RCD and zener snubber, the lat
Hi, I want to design a flyback converter Input DC voltage range is from 60V-180V DC Out put voltage required is a single tap - 15V/0.8A I was looking through the TNY ICs like TNY268 .. can somebody provide me some help? Regards Steve.
My requirement is to step up from 5 to 9 V to ? 100 to 150 V with a PIC controlling the voltages. I can do the PIC bit but I'm unsure on which SMPS topologies would be best. The ?100 to 150 V supplies will be required to deliver up to 300 mA pulses into a load that will be in the range of 500 - 1000 ohms so instantaneous power is 90W but the d
Hello, I assume you want to make a true sine wave inverter. Such converters use a two-step approach. An isolated transformer is required to step up the low voltage DC to about 180VDC. This DC to 180VDC converter can be a H-bridge type as well. You need more mosfets, but the transformer design is easier. The second converter (that is fed from t
It can be used as a flyback controller. The only real difference between boost and flyback is that there is an isolated transformer instead of an inductor, and an isolated feedback network. Both of those are external to the controller IC, so the controller doesn't really care. In general a "flyback controller" is the same as a boost (...)
Can be done, needa 2 switch flyback (500/600V fets) or a 800/900 V mosfet for single switch. We have done 300W flybacks with 10 ADC continuous out
Is there a solution to step up from 5V DC to 300V? Or 12V to 300V (DC)? I found something on this forum as flyback Inverters... I want to use it to power my CDI.
check these LM5015 high voltage Monolithic Two - Switch Forward DC-DC ... [url=
hi sir, i have designed flyback topology smps. In the output,i have selected Co capacitor ,this capacitor causes 4V thin spike at the output side. In order to reduce this spike,i have to go with LC filter or i have to increase the capacitance by putting number of capacitors in parallel. but i would like to go with LC filter. Can any one sug
Good afternoon guys, I am currently designing a prototype for the company I work at. For this I need to converter a 6 VDC (or 12 VDC) voltage to 250 VDC. My initial idea was to use a flyback converter (though I don't have much experience with analog electronics. Does anybody know where I can buy an IC that would do this (or at least (...)
Are you boosting it up from 12V/24V? Is this for an inverter? What is the power rating? I think you need a good amount of power (> 100W). So, you should use push-pull instead of flyback. Use a ferrite transformer to boost the voltage. At the output, rectify and filter. Then, you need to convert to 50Hz using a full-bridge converter. Hope this he
Dear high voltage ! Hi See below , please:
Hello everyone! I have recently designed PExprt model od flyback transformer, and now I have to simulate flyback converter using Simplorer. I've inserted PExprt model in Simplorer (transformer) and now I have to link it in flyback converter. Everything is OK with PExprt model, problem is in Simplorer. The problem is (...)
who knows the how much drop voltage flyback converter or curve current vs voltage when loaded......
Dear sanks Hi Why not an SMPS ? for example a simple flyback converter . ( in current mode topology ) . it's out put current can't exceed from authorized value . BTW : what do you mean by constant current ? are you referring to a current source ? or just limited current ? Best Wishes Goldsmith
whatever the input current waveform shape of a forward converter, you can make a flyback with that same shaped input wavefrom. so from the input its exactly the same. They are indeed the same.......maybe at the secondary the forward can have a bit lower peak current peak. But two transistor forward and two transistor flyback are both applicable
hi i have designed some switching power supply succesfully in the last but now should design above power for a big factory to manufactureing in large amount any ps fault would introduce a cost about 40$ and ps should sustain any tribble condition like termal, moistur, suden line voltage or load current fluctuation and ... it also (...)
Hello! I am a newbie in smps, I making a smps with input 33VDC, output 12VDC 1A using UC3842. It work but there are some problem: - The mosfet, and diode D1 overheat. I dont understand what happen. Please explain to me. This is schematic 84695 The flyback transformer use EE25 with air-gap 0.25mm, primary winding is w
With the second scheme, you changed the flyback into a forward converter, not what you want, I guess. Twe too high output voltage in first case isn't a problem of transformer design, it means that the feedback circuit isn't working. Your schematic has a missing ground connection, but there may be other problems too. The (...)
Hello I suggest you to take out flyback transformer from old television....but as it is working on 15625Hz frequency you must be switch its supply using IGBT or MOSFET even though it is cost effective solution from such circuit you can generate about 15Kv easily....... -regards
I'm studing the flyback SMPS. The documents about flyback say about the difference between CCM mode and DCM mode, for example, primary and secondary current, transformer inductance, etc. But I cannot find any information about the difference in the topology. What is the difference? Are they same in topology, only difference in transformer ind
Instead of trying to design a HV transformer with a ferrite of unknown parameters, I would recommend to try a flybackblock from an old TV set operated on 12 VDC. A typical HV is 10-15 kv without load, and the switching transistor can be driven from a 555 timer with ~15 kHz. The HV blocks are also safe to use if you know how to handle 15kV.
It is in my experience very feasible way to make a switchmode converter based on PIC. Naturally, as shanren points out, the noise from switching may be a problem, if not handled properly. I have some years ago made a PIC based DC to AC converter - to be used as phone ringing voltage generator in a telecom unit. I used a MosFet transistor switch
first ,if you use buck regulator,If input is 3.3V,then 3.3V output is difficult. I think you can use buck-boost(flyback) topo,or use sepic topo.
Snubber Circuits Suppress voltage Transient Spikes in Multiple Output DC-DC flyback Converter Power Supplies The flyback dc-dc converter topology results in significant cost and space savings for multiple output power supplies with high output voltage for power levels up to 100W. flyback (...)