treez
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Yesterday, 21:34remember to add a dummy load if you start powering it "open loop".8 replies | 360 view(s) -
Yesterday, 21:04if you want to reduce your V reflected to pri in a flyback smps, even though your vout is high, then consider having multiple secondaries, and then...11 replies | 370 view(s)
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Yesterday, 21:00treez replied to a thread Conducted emissions: Noise current limit for house hold appliances. in Power ElectronicsAkinamo here is one conducted scan from UK...for a lighting product prototype (offline 60w flyback smps)6 replies | 174 view(s)
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Yesterday, 06:15treez replied to a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power ElectronicsThe thing is (on a related subject) people often talk about winding torroids so that there is minimal capacitive coupling of the wire to the...14 replies | 385 view(s)
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17th April 2019, 19:59treez replied to a thread Offline SMPS EMC scans: Why are "common mode only" scans so expensive? in Power ElectronicsThanks, also , i believe shorting the primary and secondary grounds of the Flyback SMPS transformer cuts down common mode emissions... (since in a...9 replies | 366 view(s)
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16th April 2019, 20:47treez replied to a thread Offline SMPS EMC scans: Why are "common mode only" scans so expensive? in Power ElectronicsThanks, its dawning on me that if we do this, we are still not going to actually know what proportion of the failure frequency on the official...9 replies | 366 view(s)
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16th April 2019, 20:29treez replied to a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power ElectronicsPrimary side ground is actually connected to the ferrite core by way of a 3cm bare copper wire which is taped to the underside of the ferrite core....14 replies | 385 view(s)
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16th April 2019, 06:21treez replied to a thread Offline SMPS EMC scans: Why are "common mode only" scans so expensive? in Power ElectronicsThanks, so do you mean that in Fig6 of the following.. http://www.compliance-club.com/archive/keitharmstrong/emc_testing2.html ...Its not possible...9 replies | 366 view(s)
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15th April 2019, 20:46treez replied to a thread Offline Flyback SMPS: Y2 capacitor from primary to secondary can be high value? in Power ElectronicsThanks, By this i am referring to the node at the ground terminal of the primary current sense resistor....ie DC Bus negative. Thanks, and so it...4 replies | 128 view(s)
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15th April 2019, 12:06treez started a thread Offline Flyback SMPS: Y2 capacitor from primary to secondary can be high value? in Power ElectronicsHi, We have an offline 60W Flyback SMPS. It has live neutral and earth coming into its mains input connector. There are then two 2n2 Y2 capacitors...4 replies | 128 view(s)
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14th April 2019, 21:23treez replied to a thread Common mode choke SRF should selected to be at the worst case EMC problem frequency? in Elementary Electronic QuestionsThnaks but as the app note in the top post says, common mode emissions are usually above 1MHz.10 replies | 1232 view(s)
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14th April 2019, 18:38treez replied to a thread Common mode choke SRF should selected to be at the worst case EMC problem frequency? in Elementary Electronic QuestionsThanks, yes i agree, but then, surely it would be better to make L lower, so that SRF was higher?10 replies | 1232 view(s)
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14th April 2019, 12:41treez replied to a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power Electronicsthanks, i will find out when i get back to where it is kept on monday...as i remember there is a kind of metal plate stamped to the ferrite, and...14 replies | 385 view(s)
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14th April 2019, 12:34treez replied to a thread Isolated offline 30W Flyback SMPS more noisy than non-isolated one? in Power ElectronicsI mean, supposing i have a conducted EMC scan of an offline, isolated 30W flyback SMPS....... Presumably, if i then "non-isolate" it by adding a...1 replies | 131 view(s)
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14th April 2019, 12:30treez replied to a thread Common mode choke SRF should selected to be at the worst case EMC problem frequency? in Elementary Electronic QuestionsPage 17 of AN15 (below) states that emissions from offline SMPS’s above 1MHz are usually common mode emissions…. AN15: EMC app note:...10 replies | 1232 view(s)
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14th April 2019, 11:35treez replied to a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power ElectronicsThanks, i used to work at the company and i know this is the ferrite core of an offline 70w flyback smps.14 replies | 385 view(s)
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14th April 2019, 09:56treez replied to a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power ElectronicsThanks, do you know why it is done? The diagram in the top post is of a transformer which exists inside a totally sealed plastic enclosure, so it...14 replies | 385 view(s)
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13th April 2019, 22:01treez replied to a thread [SOLVED] Continuous charging and uncharging a large capacitor with 20 mF,10 Hz and 400Vpp in Power Electronicsto charge 20mF to 400v in 0.1sec takes 80A if charging current (not power) is constant. ...But maybe you start by charging with higher current,...10 replies | 942 view(s)
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13th April 2019, 21:53treez started a thread Common mode noise reduction by connecting ferrite SMPS core to ground? in Power ElectronicsHello, How much better improvement would you expect to get in common mode emissions in a 30W offline flyback by connecting the ferrite core to...14 replies | 385 view(s)
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13th April 2019, 19:50treez started a thread Isolated offline 30W Flyback SMPS more noisy than non-isolated one? in Power ElectronicsHi, In an isolated offline, 30W Flyback SMPS, we all have to add a Y capacitor from secondary to primary in order to mitigate common mode...1 replies | 131 view(s)
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13th April 2019, 17:49treez replied to a thread Offline SMPS EMC scans: Why are "common mode only" scans so expensive? in Power ElectronicsThanks, Yes, we need to actually take in our own splitter transformer and ask them to connect it up to the LISN outputs upstream of their Network...9 replies | 366 view(s)
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13th April 2019, 17:07treez replied to a thread LLC converter with variable output voltage 0..10VDC @1.7kW in Power ElectronicsThe output voltage is 10V at 500A(?) The PSFB’s have a vin of ~400V. So three PSFB’s (one from each phase path), with 10V output, each deliver...21 replies | 767 view(s)
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13th April 2019, 11:01treez replied to a thread MOSFET is not turning off perfectly at high frequencies in Power ElectronicsYes i also suspect the gate drive is indeed not powerful enough... How have you connected up the ADP3418? Can you show schem? ADP3418...12 replies | 1247 view(s)
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13th April 2019, 10:54treez replied to a thread Temperature strange problem with a switching regulator in Power ElectronicsSorry please explain, you shorted out the buck inductor? What does your output divider voltage equal at 24v output? - - - Updated - - - At...2 replies | 307 view(s)
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13th April 2019, 10:22treez replied to a thread LLC converter with variable output voltage 0..10VDC @1.7kW in Power ElectronicsHere is a good thread on the PSFB, and modifications to it...also a bit about sec diode ringing which OP is interested in....21 replies | 767 view(s)
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13th April 2019, 09:39treez replied to a thread EMI filter design for very low power switching power supply? in Power ElectronicsWell I guess you are using one of those lnkswitch type things. The thing is they have an internal fet in the controller, and we have no way of...4 replies | 171 view(s)
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13th April 2019, 09:05we took apart one of these (similar one) and found it had a little non isolated buck converter inside it....8 replies | 893 view(s)
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13th April 2019, 08:53treez replied to a thread MOSFET is not turning off perfectly at high frequencies in Power Electronicsalso, is your gate drive loop (pcb layout) nice and tight?12 replies | 1247 view(s)
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12th April 2019, 23:09treez started a thread Impednace vs frequency graph for offline common mode chokes. in Power ElectronicsPg 3 of the following shows impedance vs frequency graphs of power line common mode chokes. ...0 replies | 150 view(s)
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12th April 2019, 22:18treez replied to a thread Why are shield windings so common in offline flybacks?....rather than a second CMC? in Power ElectronicsI suppose that having an aux coil doubling up as a shield winding is a good use of the (often limited) space in a transformer bobbin. The thing is, I...5 replies | 207 view(s)
About treez
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- April 5, 1982 (37)
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