Easy peasy
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Today, 00:30Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power Electronicsit is not a constant thing - certainly for a flyback entering CCM - high mains and full load will be an issue - the most stress on the o/p ...17 replies | 445 view(s) -
Yesterday, 23:19Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsX7R has a worst case dissipation factor ( tan delta ) of 2.5% for HV caps The rms voltage during the noisy periods is about 42V rms at sw...17 replies | 445 view(s)
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Yesterday, 09:13Wow - so much helpful supporting information - ckt diagram, part numbers, type of chips used ... don't forget only if an output line is...6 replies | 217 view(s)
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10th November 2019, 22:19Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsYup - emc is always measured at worst case - so min AC line max current & max AC line - max load both cases ....17 replies | 445 view(s)
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10th November 2019, 19:32Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power Electronicsrunning CCM is a bad idea for RFI noise, as the o/p diode gets quite the hit - this explains the band of noise in pic #1 ...17 replies | 445 view(s)
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10th November 2019, 09:23Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsThe first picture is a bit odd, it is almost as if you are going from DCM to CCM for the middle (noisy) part - CCM makes the o/p diodes reverse...17 replies | 445 view(s)
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10th November 2019, 04:28Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power Electronicssorry - brain fade - of course the ferrite Tx is the boost choke - actually flyback Tx performing same function... your constant off...17 replies | 445 view(s)
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9th November 2019, 20:30Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsWhat is the boost choke --- ? the PFC flyback is obviously doing more work at higher loads / higher mains, the associated volt ripple on the...17 replies | 445 view(s)
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9th November 2019, 07:05Easy peasy replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power Electronicsit appears the PFC is somehow going to a lower sw freq once it passes a certain voltage ( or current ) and this is causing the increase in Vripple...17 replies | 445 view(s)
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7th November 2019, 20:28try running off 6V initially - this xtor does not have a high Vce, class E will ring the collector up to 2 x Vin...12 replies | 360 view(s)
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6th November 2019, 21:24Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignI have never seen a BJT fall to un-useable levels of gain through being OCCASIONALLY used as a zener, when it is used as a zener - the gain...21 replies | 623 view(s)
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6th November 2019, 18:17Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit Designyou seem to be allowing my point - which is - by far most of the B-E junction is buried - away from any oxides ... ?21 replies | 623 view(s)
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6th November 2019, 10:44Easy peasy replied to a thread IFC TG179 TO-92 (transistor) in Service Manuals, Requests, Repair Tipslikely npn - as the base is in the middle, Collector on the left ( flat down, pins towards you ) emitter on right - but this is just...6 replies | 1084 view(s)
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6th November 2019, 06:05Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit Designsurely in a BJT the metallisation goes straight onto the Si, then if you want to protect the Al metal, you form an oxide on that, any non...21 replies | 623 view(s)
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6th November 2019, 02:53Easy peasy replied to a thread Symmetric Source + 10V and -10V - help me !! in Hobby Circuits and Small Projects Problemsthe 12V to +9V could be done with a TLC555 IC and a sepic power stage ( to allow for dips when starting ) - easy for 800mA the 12V to...4 replies | 409 view(s)
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5th November 2019, 21:30Easy peasy replied to a thread Longer deadtime or blanking time between two mosfets of one leg phase U or v or w in Power ElectronicsCan the longer dead time cause distortion in output waveforms? YES And as a result torque ripple?? YES - but usually quite small And...4 replies | 246 view(s)
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5th November 2019, 21:28Easy peasy replied to a thread Reverse recovery losses in synchronous rectifier in Power ElectronicsDear smazzer, you asked several questions, which in particular do you consider was not answered ? - - - Updated - - - surely this was the...7 replies | 299 view(s)
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5th November 2019, 10:19Easy peasy replied to a thread Reverse recovery losses in synchronous rectifier in Power ElectronicsWell, yes, as you must have a finite dead time - the losses in the bottom fet are related to the dead time - too long a dead time and the...7 replies | 299 view(s)
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5th November 2019, 10:09Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignAre there many oxides in a BJT ...? I would have thought not - in CMOS maybe ...21 replies | 623 view(s)
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5th November 2019, 02:41Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignDear std_match, assuming the junction remains below 115 deg C how EXACTLY does zener operation reduce the gain of the device? natural drift...21 replies | 623 view(s)
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4th November 2019, 23:08above ~ 100 watt, layout, RFI, and transformer construction issues tend to dominate and need an experienced power electronics designer - the...4 replies | 191 view(s)
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4th November 2019, 23:01Can your 3v3 source supply enough power ...? - - - Updated - - - At 900Hz you'll need a larger storage cap on the boost .. - - - Updated - -...7 replies | 236 view(s)
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4th November 2019, 10:12For ER28 with 2.5mm centre pole gap ( or 1.25mm right thru ) for 55uH and 25Apk the Bpk = 459mT which is too high, the gap needs to...15 replies | 591 view(s)
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4th November 2019, 05:53Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignOh yes - the 431 could control the npn directly producing the 8v3 @ 10mA ....21 replies | 623 view(s)
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4th November 2019, 01:26Easy peasy replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit Designthe emitter base will zener at 6 - 7 volts the current limited by the 100E resistance and the output Z of the op amp assuming the emitter is...21 replies | 623 view(s)
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4th November 2019, 00:05do you have cell balancing for the 4 "cells" i.e. if one "cell" goes too high or low you can shift current to the other cells or stop the...2 replies | 501 view(s)
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4th November 2019, 00:01Easy peasy replied to a thread Ohm's Law and Power calculation problem in Elementary Electronic QuestionsYou can calculate instantaneous power at a single point in time - then integrate, then average over larger portions of time but the simple...20 replies | 770 view(s)
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3rd November 2019, 23:58Easy peasy replied to a thread Will we get tombstoning of this capacitor and resistor? in PCB Routing Schematic Layout software and SimulationSeems unlikely if it is solder stencil and oven ...4 replies | 234 view(s)
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3rd November 2019, 22:23Easy peasy replied to a thread SMD Sync Buck converters with parallel FETs and no heatsinks in Power ElectronicsSome brands tolerate paralleling much better than others - it is a trial and error thing ... at least 3.3 ohms on each gate though ...6 replies | 327 view(s)
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3rd November 2019, 22:21Easy peasy replied to a thread Adding capacitor to Cgs in low side FET of sync Buck converter. in Power ElectronicsAs FvM says the low side switch in a synch rect buck converter is soft switched ( except at zero load ) so the gate drive burden is lessened any...4 replies | 242 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- Occupation:
- engineer
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