Easy peasy
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Today, 04:16Easy peasy started a thread Fourier analysis of 5 pulse MPWM ( multiple pulse width modulation ) for inverter in Mathematics and PhysicsHello All, thought I would re-post this here - as it essentially a mathematics problem. Determine the placement and width of a 5 pulse multiple...0 replies | 36 view(s) -
Yesterday, 23:16Easy peasy replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects Problemsthere will always be a small amount of ringing when the diodes turn off - less for faster diodes, putting 100n in parallel with the slow diodes...11 replies | 302 view(s)
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Yesterday, 19:03Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Power ElectronicsHello FvM, yes your sketch is correct, the magic sine waves page does not quite cover what I am seeking ( 5 pulse unipolar ) I note that LT...4 replies | 207 view(s)
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Yesterday, 01:59Easy peasy started a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Power ElectronicsHello All, we are looking at 5 pulse MPW for small inverters, 24VDC to 230Vac 50/60 Hz. ( unipolar for those tech savy in this area ) Is...4 replies | 207 view(s)
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Yesterday, 01:49Easy peasy replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsAn RC snubber across rectifying diodes can help remove ringing - do in fact - you need a scope to see this effect and to tune the snubber ... ...11 replies | 302 view(s)
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15th November 2019, 10:16Easy peasy replied to a thread Will this ceramic capacitor be damaged by overvoltage spikes? in Analog Circuit Designhello Treez, that engineer was a bit ill informed himself - even X7R MLCC's have a characteristic of falling effective capacitance with DC bias...6 replies | 243 view(s)
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15th November 2019, 03:35Easy peasy replied to a thread Will this ceramic capacitor be damaged by overvoltage spikes? in Analog Circuit DesignMLCC are good for quite a bit of over-volts - the acid test is the leakage current at rated volts - when this starts going up - you have...6 replies | 243 view(s)
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14th November 2019, 09:24Easy peasy replied to a thread Differential amplifier measure -32V to +32V with single 3.V supply in Analog Circuit Designfor negative input voltages you need a neg supply for the op-amp unless you level shift the op-amp or the input. assuming the CM i/p range of the...7 replies | 199 view(s)
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13th November 2019, 01:22turn on your fets slower to reduce radiated noise - try 33 ohm for starters ...24 replies | 920 view(s)
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12th November 2019, 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 | 636 view(s)
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11th November 2019, 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 | 636 view(s)
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11th November 2019, 09:13Wow - so much helpful supporting information - ckt diagram, part numbers, type of chips used ... don't forget only if an output line is...7 replies | 341 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 | 636 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 | 636 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 | 636 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 | 636 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 | 636 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 | 636 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 | 446 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 | 734 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 | 734 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 | 1130 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 | 734 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 | 447 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 | 279 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 | 359 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 | 359 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 | 734 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 | 734 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 | 219 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- engineer
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