treez
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Today, 10:52treez started a thread ACS722 Hall sensor IC...minimum loading for output signal voltage pin? in Elementary Electronic QuestionsHello... On pg 6 of the ACS722 Hall sensor IC datasheet it says minimal loading for VIOUT pin is 4k7. Does this mean we need to load it with at least...2 replies | 94 view(s) -
6th April 2020, 20:30looks good...but you need to put your values into the attached ltspice schem and run it and check for the zvs etc - - - Updated - - - ...16 replies | 619 view(s)
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5th April 2020, 19:01With the LLC, you should choose a magnetising inductance value as high as possible in order to reduce circulating current….however, there must be...16 replies | 619 view(s)
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5th April 2020, 15:04In this course there are folders on LLC for you if you want….. https://drive.google.com/open?id=0B7aRNbu3Fes4TU92Mkw3YlA3ams Basically, you must...16 replies | 619 view(s)
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4th April 2020, 22:25Yes..the 1:1 core you showed me in post #18 above cannot do 5vout from 5vin in pushpull connection...neither with currnt doubler connection, nor...22 replies | 943 view(s)
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4th April 2020, 17:16your spec is 5vin 5vout 5wout 250khz. That transformer is 1:1.......so you wont be able to get 5vout from 5vin with a pushpull with split secondary...22 replies | 943 view(s)
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4th April 2020, 14:18Whats your likely best one.?..(part num?)....tell it here and ill design it through for you and post it. - - - Updated - - - i think Kashcke...22 replies | 943 view(s)
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4th April 2020, 12:27ok in that case its even easier for you...pick a core, taking a general note of its size, cross sectional area, in relation to your power , and go...22 replies | 943 view(s)
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4th April 2020, 10:34Theres no “equation” that you can use to tell if any given transformer core set is ok for your particular application. Things like “has it got a...22 replies | 943 view(s)
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3rd April 2020, 10:02Thanks...Woops yes, I forgot to include an error amplifier which would kick in if Vin to any converter fell to 250V, and it would start pegging back...3 replies | 238 view(s)
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3rd April 2020, 08:24Hi A way of doing this Power supply spec?….. Vin = 1000v to 880v (source is 1000V but cable resistance between source and Power supply is 7.5...3 replies | 238 view(s)
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1st April 2020, 21:19here is a push pull thread with some advice on transformer...22 replies | 943 view(s)
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1st April 2020, 20:44here is a SMPS power module that can do the job for you.... https://recom-power.com/pdf/Eval-Boards/RPM-1.0-EVM-1.pdf buck is maybe no good as...3 replies | 312 view(s)
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1st April 2020, 06:08treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsThanks, yes, the sole reason for isolation is that it “breaks” the current loops in which high frequency noise currents can be induced in to….these...58 replies | 3624 view(s)
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31st March 2020, 21:13treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsPlease find block diagrams of two 3.7kW power supplies. One is isolated. One is not. They are otherwise the same. Which one is more likely to...58 replies | 3624 view(s)
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31st March 2020, 05:59treez replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic Questions...the top video of #7 above shows why pink bags would be useless for carrying PCBs whilst walking on a non esd safe carpet17 replies | 836 view(s)
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30th March 2020, 19:05treez replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsThanks. ill look into static shielding tubs because static shielding bags are pricey, and to test if they are genuine you need a $460 surface dc...17 replies | 836 view(s)
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30th March 2020, 18:17treez replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsThanks, i see that if i were to carry a populated PCB across a non ESD safe carpet, then the pink bag ("anti-static)" would be of little use, but...17 replies | 836 view(s)
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29th March 2020, 19:04Hi, Regarding an SMPS with just a two wire feed (go and return), it is a fact that generally a non-isolated design will give a lesser common mode...11 replies | 629 view(s)
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29th March 2020, 18:45treez started a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsHi Due to lack of funds we are doing electronics in an office with a carpet which is not ESD safe. Often we need to carry a PCB with ICs etc on...17 replies | 836 view(s)
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29th March 2020, 14:52Thanks, ..it would be too heavy to have an extra earth wire in the tether, along with the go and return wires.11 replies | 629 view(s)
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28th March 2020, 17:50treez replied to a thread Transient testing rig for 3720W power supply with DCDC modules. in Power ElectronicsThanks, though they wish to do it with a high side fet, more on this later. Do you agree that the switched FETs must have gate_source resistors...5 replies | 494 view(s)
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28th March 2020, 11:04As Easy Peasy says you may well have blown the fet...and with a mains circuit and a blown fet...you may have blown the uc3845 too...a blown fet often...23 replies | 1016 view(s)
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27th March 2020, 12:52treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsThis “noisy output current feature”….is possibly not a bad thing….the module still supplies the load perfectly well with max/off transients served...58 replies | 3624 view(s)
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27th March 2020, 09:35treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power Electronics..I must admit this noise in the output current is the most unthreatening noise i have ever seen...it doesn't get any worse no matter how much extra...58 replies | 3624 view(s)
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27th March 2020, 07:07treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsHi, We find that when we have more than 220uF of C(out) on our DCDC module the output current gets unstable as attached. It’s a...58 replies | 3624 view(s)
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26th March 2020, 22:19treez replied to a thread Noise coupling into DCDC module via the ground copper pour directly beneath it? in Power ElectronicsThe noise in the output current is solved by reducing the output capacitance to 220uF. -But the datasheet states that up to 2mF should be allowable...2 replies | 298 view(s)
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26th March 2020, 17:25treez replied to a thread How to mitigate large area ground current loops in large arrays of paralleled SMPS's? in Power ElectronicsThanks, ...someone who says they have worked with these modules and systems before has assured us that our biggest problem will be "circulating...3 replies | 279 view(s)
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26th March 2020, 16:19treez started a thread How to mitigate large area ground current loops in large arrays of paralleled SMPS's? in Power ElectronicsHi We are doing a 12kW power supply by paralleling over 40 DCDC modules. This question is not specifically about the modules. It is rather about the...3 replies | 279 view(s)
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26th March 2020, 09:50Please consider this riddle of common mode filtering in a non isolated SMPS... We have a non-isolated SMPS in a metal box, where chassis (metal...11 replies | 629 view(s)
About treez
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- April 5, 1982 (38)
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