treez
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Yesterday, 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 | 497 view(s) -
Yesterday, 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...7 replies | 229 view(s)
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Yesterday, 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 | 497 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 | 440 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...20 replies | 522 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...55 replies | 3403 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...55 replies | 3403 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...55 replies | 3403 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 | 246 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 | 205 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 | 205 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 | 497 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 | 246 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 | 497 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 | 497 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 | 497 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 | 497 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 | 497 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 | 497 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 | 440 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 | 710 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 | 710 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 | 611 view(s)
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22nd March 2020, 02:14treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsHi, We are using the DCM3623T50M53C2T00 as a DCDC module. This module has some signal pins. Its usual to provide noise-proofing for signal pins...55 replies | 3403 view(s)
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22nd March 2020, 00:14treez replied to a thread Which type of SMD capacitors are more robust against PCB flexion cracking? in Elementary Electronic QuestionsPage 5 of the following indicates that “metal frame” ceramic caps are more resilient to both flexion cracking and solder cracking than “flexiterm”...5 replies | 584 view(s)
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21st March 2020, 20:02treez replied to a thread Large numbers of paralleled DCDC modules?...more than datasheet recomends in Power ElectronicsPage 23 of the “DCM design guide” states that the SRF of the input filter capacitor must be higher than the switching frequency of the DCM module....55 replies | 3403 view(s)
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21st March 2020, 18:50treez replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsWhy is the noisy output current of our DCM module not constant?…it can actually disappear for a few seconds…then creeps back. We note that the...16 replies | 828 view(s)
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20th March 2020, 06:49treez replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsThanks, it does seem odd though, that the noisiness of the output current vastly reduces (but doesnt completely go) when the module heatsink gets to...16 replies | 828 view(s)
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19th March 2020, 22:05treez replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsI also cut through the input power plane of the module, and added a 150nH inductor there (downstream of C68 in the “A” circuit of the top post….this...16 replies | 828 view(s)
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19th March 2020, 19:45treez replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsHi, The noisey output current of the DCDC module happens far more just after switch ON, whilst the module is still quite cool…..as its heatsink...16 replies | 828 view(s)
About treez
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- April 5, 1982 (37)
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- cyclist
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- football, cycling
- Occupation:
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