baileychic
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Yesterday, 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...11 replies | 408 view(s) -
Yesterday, 01:51Yes, using 2 x toroids is possible - just a bit untidy looking ...6 replies | 321 view(s)
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Yesterday, 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...11 replies | 408 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...11 replies | 408 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 | 537 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 ....11 replies | 408 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 | 206 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 | 321 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 )...92 replies | 3094 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 | 223 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 | 957 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 | 331 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 | 252 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 | 957 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 | 957 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 | 957 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 | 694 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 | 867 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 | 539 view(s)
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20th March 2020, 02:15Easy peasy replied to a thread Inductor question. Why current goes up then down instead of decreasing with frequency in Elementary Electronic QuestionsYou are seeing parallel resonance of the inductor - at a certain frequency it will look hi Z - it will then support all the volts from the...9 replies | 539 view(s)
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19th March 2020, 23:13Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsSome of your caps might be a bit iffy - this used to be a prime source of noise once - which was hard to find ...16 replies | 926 view(s)
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19th March 2020, 07:26Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsYep - sure you can try that ...16 replies | 926 view(s)
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18th March 2020, 22:30Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power Electronicsyes there is HF ripple of some sort flowing b/n the internal and external caps, upsetting your ( low cost (?)) I sensor - the only way to...16 replies | 926 view(s)
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18th March 2020, 22:25Easy peasy replied to a thread what if i connect a battery to the electromagnet? in Power ElectronicsDepends on the Lithium chemistry, but most of the energy is delivered at 3V, a quality industrial Li-Fe-PO4 ( prismatic ) delivers from 3.3 ...10 replies | 629 view(s)
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18th March 2020, 22:21it will cause a lot of extra primary current - a bad thing ... when the main mosfet has to turn off44 replies | 1886 view(s)
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17th March 2020, 03:26Easy peasy replied to a thread what if i connect a battery to the electromagnet? in Power ElectronicsMeasure the resistance of your electromagnet if it is 0.5 ohm say ... at 3.0 volts this is 6A, your 18650 cell will not provide this for...10 replies | 629 view(s)
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17th March 2020, 03:24Easy peasy replied to a thread thought experiment to understand radio propagation. in RF, Microwave, Antennas and Opticsit also depends on the effective radiated power - a usual receiver can operate on 0.5uV,13 replies | 762 view(s)
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17th March 2020, 03:22Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsUpstream means the sensor sees all the high freq current info into the capacitor - this will always be more stable ...16 replies | 926 view(s)
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15th March 2020, 21:37Easy peasy replied to a thread Question why one of the MOSFET burn shorted in my SS relay in Power ElectronicsIf, you are using fets from Ali-express - you need to allow that failures will happen ...56 replies | 2282 view(s)
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