treez
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1st April 2020, 21:19here is a push pull thread with some advice on transformer...9 replies | 413 view(s) -
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 | 217 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 | 3530 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 | 3530 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 | 641 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 | 641 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 | 641 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 | 562 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 | 641 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 | 562 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 | 462 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 | 721 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 | 3530 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 | 3530 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 | 3530 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 | 268 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 | 235 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 | 235 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 | 562 view(s)
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25th March 2020, 17:14treez started a thread Noise coupling into DCDC module via the ground copper pour directly beneath it? in Power ElectronicsHi, Please assist in telling if noise could be coupling into our DCDC module via the ground plane that we have underneath the module? Maybe we...2 replies | 268 view(s)
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25th March 2020, 16:50Thanks, the drone won't have a real earth on it as such...the drone will be at the end of a 100 metre tether...this just comprises the go and return...11 replies | 562 view(s)
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25th March 2020, 10:05the chassis cannot be grounded to the circuit negative, otherwise it will become a circuit conductor Base unit on ground is ultimately powered by...11 replies | 562 view(s)
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25th March 2020, 07:35Thanks, and rather than regulations being the guide here.... it all follows from the fact that the metal chassis of the power supply, .. ...11 replies | 562 view(s)
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24th March 2020, 22:02Thanks, on page 87 of the DCM design guide, it shows chassis ground in yellow. Chassis ground is deliberately not connected to any circuit ground...11 replies | 562 view(s)
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24th March 2020, 16:28We quite literally have nothing to connect Y capacitors to...so cannot use them. Would you agree? - - - Updated - - - ...11 replies | 562 view(s)
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24th March 2020, 13:03Hi, We are doing a non isolated SMPS so please confirm we don’t need Y capacitors in our common mode filter? Vin = 34V Vout = 48V Pout = 312W...11 replies | 562 view(s)
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22nd March 2020, 21:34treez replied to a thread Transient testing rig for 3720W power supply with DCDC modules. in Power ElectronicsThanks, yes i'd prefer if it was non-retriggerable...but they are not as easy to source. Would you agree that in fact, it can actually be a...5 replies | 462 view(s)
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22nd March 2020, 19:12treez replied to a thread thought experiment to understand measuring equipment. in Power Electronicsfrom your diagram, the meter will measure 60000 volts...i think you know this? There will be no current because an ideal voltmeter has no current...18 replies | 758 view(s)
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22nd March 2020, 16:16treez replied to a thread thought experiment to understand measuring equipment. in Power Electronicsok but you dont have a circuit..and given an ideal multimeter it would say 0 volts18 replies | 758 view(s)
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22nd March 2020, 10:5419.5 volts and 3.34 amps sounds like 65w, ie low enough to not need power factor correction. So its probably just an offline flyback converter. So...10 replies | 646 view(s)
About treez
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- April 5, 1982 (37)
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