Easy peasy
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Today, 01:14what is your load exactly? as above if SCR gated on it will stay on until current falls to essentially zero, i.e. you cannot turn an SCR off once...10 replies | 329 view(s) -
Yesterday, 01:38Um, no we don't - we looked inside, 64 mosfets, with drivers, control card, fan drive ( varies with power/temp ), over temp protection, ...10 replies | 329 view(s)
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8th April 2020, 10:44we purchased several for Li-ion testing, and they modified one for us, so we could input 0-10V for 0 - 100A apparently they can do constant R...10 replies | 329 view(s)
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8th April 2020, 02:08Easy peasy replied to a thread Why and how is PWM implemented in Field Oriented Control (FOC) ? in Power Electronicsrespectfully - you appear to need a better understanding of the whole system - try talking to fellow engineers ...2 replies | 212 view(s)
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8th April 2020, 02:04you might want to start with something like this electronic load 3kW + http://www.pwrtrnx.com/index.cfm/4,457,html10 replies | 329 view(s)
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8th April 2020, 01:59for a 9" x 5" oval you can assume 25 - 35 watts max ...10 replies | 603 view(s)
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8th April 2020, 00:031.5W / m.K = 0.667 mK / watt, let us assume 10W per your prev post, and 1cm thru thickness and 3 x 3cm area as an approximation this is ...18 replies | 719 view(s)
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7th April 2020, 13:47what are you potting in? does the potting compound have high thermal conductivity ? or is it more of a thermal insulator?18 replies | 719 view(s)
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7th April 2020, 11:01It will be exactly 0.2% of the total kVA of the GCI .....3 replies | 185 view(s)
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7th April 2020, 07:53Sot-223 ...6 replies | 237 view(s)
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7th April 2020, 05:28PQ5050 N97 = 3.5W 100kHz, 100mT peak ... make sure the freq can go high enough fast enough when a short is applied to the o/p. This is the...18 replies | 719 view(s)
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6th April 2020, 21:45The graphs are somewhat useful, remember you must control Fmin, such that you do not attempt to go too low in freq, i.e. in an attempt to get...18 replies | 719 view(s)
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6th April 2020, 01:51Yes, using 2 x toroids is possible - just a bit untidy looking ...6 replies | 424 view(s)
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6th April 2020, 01:30If you are in ZVS, then by definition you are above the resonant freq of the ckt at that operating point ... - - - Updated - - - Also if you...18 replies | 719 view(s)
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5th April 2020, 11:58you are evidently un-aware of the hard switching failure mode of almost all mosfets in hard switched capacitive mode - let alone the losses and...18 replies | 719 view(s)
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5th April 2020, 08:49It's a fair bet you have inadvertently built something wrong - or blown a part or parts up thus far ...10 replies | 616 view(s)
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5th April 2020, 08:46below resonance operation is inviting your mosfets to go bang all the time - redesign for always above resonance ....18 replies | 719 view(s)
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5th April 2020, 08:42Dear Draytek, if you really require 400V 12.5A out, AND, at another time, 40V 125A, you will need either a serious tap on the transformer or...4 replies | 258 view(s)
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5th April 2020, 08:35you need an EI core at least with wdgs on the outer legs - as well as the central leg ...6 replies | 424 view(s)
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4th April 2020, 03:57Easy peasy replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsA diac is in fact a triac, with internal resistors such that it breaks down to a volt or so ( as long as there is sufficient current to keep it on )...104 replies | 3570 view(s)
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3rd April 2020, 09:44Easy peasy replied to a thread 12kW power supply spec with vin = 1000v to 880v? in Power ElectronicsWe would do this with 3 x H-bridges in series, 600V devices on each - giving 1800V input max 84A o/p per H bridge @ 48VDC ... Automatic...3 replies | 248 view(s)
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2nd April 2020, 08:47The ringing is normal for light load - the overshoot is not too bad either - try higher loads ....23 replies | 1030 view(s)
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31st March 2020, 04:05Easy peasy replied to a thread Is a snubber circuit required with zero-cross optocoupler in Power ElectronicsA snubber is a good idea if the load is unknown, these drivers switch the triac on soon after zero crossing, so the load current will start from...4 replies | 349 view(s)
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30th March 2020, 04:49Easy peasy replied to a thread Dimmer lamp 220v ac (resistor values) in Elementary Electronic Questionsif you want to limit the max gate current to 1A say, then R1 + R2 = 325 ohm, note they must be rated for >200V each to avoid them breaking...2 replies | 279 view(s)
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28th March 2020, 21:09Faulty scope probes or "open ckt" gnd connections will not help in fault finding, hopefully your fet and driver and associated cktry have survived...23 replies | 1030 view(s)
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27th March 2020, 23:32A flyback transformer needs a gap in the core ( unless for VERY low power ) to store the energy, It is essentially a well coupled inductor. With...23 replies | 1030 view(s)
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27th March 2020, 22:36the fet might well be dead ... - - - Updated - - - or the transformer phasing or gap may be wrong ...23 replies | 1030 view(s)
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24th March 2020, 05:02the above modified sine wave will power a lap top charger as will even cruder modified sine system of a single step - mainly because the laptop...10 replies | 723 view(s)
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23rd March 2020, 10:18Easy peasy replied to a thread thought experiment to understand measuring equipment. in Power ElectronicsI think you guys have properly scared him off this thread/site now ...18 replies | 921 view(s)
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20th March 2020, 09:08Easy peasy replied to a thread Inductor question. Why current goes up then down instead of decreasing with frequency in Elementary Electronic Questionsyes opposite effect described - apologies - either a typo or there is a series cap causing a min resonance in Z.9 replies | 564 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- Melbourne
- Occupation:
- engineer
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