Easy peasy
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Today, 07:12Easy peasy replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsFAN9611 fits the bill for controller I think ...12 replies | 325 view(s) -
Today, 06:56baileychic replied to a thread CAN communication between two nodes (PIC18F458 and MCP2551 ) hardware in MicrocontrollersTRISC should be 0xC0 for both PIC18F devices.6 replies | 350 view(s) -
Today, 01:02Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and PhysicsHello FvM, thank you for your kind remarks, can you please explain what r1, f1 is in the above? and the ratio or exact width of the 3...13 replies | 415 view(s)
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Yesterday, 23:51you need to read far more about the active clamp flyback and the effect of input caps, there is literally heaps of information on manufacturers web...1 replies | 110 view(s)
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Yesterday, 23:49Easy peasy replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThe aim should be to make it as good as possible at the lower powers, testing other makers products is a good place to learn, below 30W there are, ...12 replies | 325 view(s)
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Yesterday, 23:44Easy peasy replied to a thread interleved active clamp flyback converter circuit in Power Electronicsstart with < 50% pwm to make things a bit easier ...3 replies | 163 view(s)
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Yesterday, 23:41Easy peasy replied to a thread How can I measure AC current with ~500 kHz frequency? in Analog Circuit Designmaking your own CT on a suitable ferrite toroid, with a suitable burden resistor ( non inductive ) and a good 'scope will allow you to measure...6 replies | 184 view(s)
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Yesterday, 23:39Easy peasy replied to a thread Transformer Phase shift used in isolated zero crossing detectors in Power Electronicsit is in fact the capacitance ( coupled with leakage L & R ) that causes the delay .... - - - Updated - - - loading the Tx should reduce...4 replies | 141 view(s)
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Yesterday, 19:49Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and Physicsgreat work FvM, unfortunately it is a bit hard to see what you have presented, the middle pulse should be the major one - as per your sketch,...13 replies | 415 view(s)
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Yesterday, 11:53Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and Physicsas it is symmetric about pi/2 ( 90 deg ) this helps in the maths13 replies | 415 view(s)
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Yesterday, 11:16PLLDIV = 4 USDDIV = 2 CPUDIV = HS, divided by 3 These will give you 48 MHz CPU clock. Edit: Or2 replies | 132 view(s)
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Yesterday, 04:16Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics 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...13 replies | 415 view(s)
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17th November 2019, 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...12 replies | 425 view(s)
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17th November 2019, 19:03Easy peasy replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and PhysicsHello 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...13 replies | 415 view(s)
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17th November 2019, 02:11Easy peasy started a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and PhysicsHello 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...13 replies | 415 view(s)
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17th November 2019, 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 ... ...12 replies | 425 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 | 276 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 | 276 view(s)
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14th November 2019, 09:24Easy peasy replied to a thread [SOLVED] 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...8 replies | 268 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 | 1016 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 | 708 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 | 708 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 | 371 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 | 708 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 | 708 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 | 708 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 | 708 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 | 708 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 | 708 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 | 487 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- Melbourne
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- engineer
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