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Recent content by cupoftea

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    [SOLVED] Household domestic grid tied inverters will die out?

    Thanks, but the only way to handle this, is for people to stop using GTI's. There's no need for the power companys to do anything to help the role out of GTI_based_solar...why should they?....they cant be responsible for customers pumping up the mains voltage. The power companys, if they dont...
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    [SOLVED] Household domestic grid tied inverters will die out?

    Thanks, To focus on the main point... This is what i mean... https://www.solarquotes.com.au/blog/grid-voltage-rise-solar/ GTI's have got serious problems up ahead !!! If people want there own solar generation. Then pretty soon, they are going to have to "island" their household mains from the...
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    [SOLVED] Household domestic grid tied inverters will die out?

    Yes i see your point...the thing is, if shedloads of houses in a neighbourhood are generating loads of energy and exporting it to the grid, then the mains level will obviously go up.....(Sunnyskyguy appears to agree with this, and sugggets that he believes that the authoirities will deal with...
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    [SOLVED] Household domestic grid tied inverters will die out?

    Thanks, and as you know, the grid itself is not a unity power factor corrected current source.......since if a non PFC'd equipment draws a high reactive power, the mains will simply supply it. So this is interesting. When GTIs pump energy into the grid, they always raise its voltage by a...
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    [SOLVED] Household domestic grid tied inverters will die out?

    Thanks, i was just thinking, such a changeover switch woudl maybe be a fairly bulky contactor in most households. Also, its difficult to see how the switchover from grid to "islanding" and vice versa would be seamless...some mains connected devices may reset or go into fault, whatever?
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    [SOLVED] Household domestic grid tied inverters will die out?

    Hi, As you know, the effect of multiple households exporting solar or wind energy back to the grid via their grid tied inverter inevitably raises the grid voltage. As solar gets more common, we will see normal grid voltages over UK and EU of 254VAC plus. As such, Grid tied inverters in people’s...
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    Filter for buck converter output

    Yes they produce some at 433MHz, but not that much, unless you really mess up the pcb layout. Radiated emissions testing goes up to 1GHz usually. You can buy PCB mounted metal shields to go over your bucks if you want......and you then shield the pcb side with pcb copper planes connected to...
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    Please confirm IGBT only conducts in one direction

    Isn't it strange that for say 20kHz converters, we dont see 1200v igbt's in parallel, instead of single 650V devices which may not have the surge voltage rating. So, Why dont we see, say two IGBTs in parallel, being driven by the same gate driver, in 2kW switch mode converters at 20khz fsw...
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    Please confirm IGBT only conducts in one direction

    Thanks, yes, i am able to find igbts with and without diode, but the key point appears to be that igbts without diode are rather rarer and possibly not a good idea to put in the BOM, as there may well be supply issues? Its difficult to assess how rare the "no diode" ones are.
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    Please confirm IGBT only conducts in one direction

    Thanks, We have a reverse recovery problem in our igbt's on-body diode, so an igbt with no diode woudl be great for us. There seems no way in digikey to sort the ones with diode, from the ones without diode. We need to use one without diode, but with two paralleled sic diodes added by us. (sic...
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    Please confirm IGBT only conducts in one direction

    Thanks, Also, do you believe this "reverse conducting" IGBT is just reverse conducting through its body diode? https://media.digikey.com/pdf/Data%20Sheets/Infineon%20PDFs/IKW30N65WR5_DS.pdf
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    Procedure for prooving that hardware is to blame for comms channel problems?

    Thanks, i think your point about timing is a very good one....its a shame each bit isnt sampled three (maybe more) times at equal intervals...and only deemed high or low if each sample was high/low.
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    Measuring difference between current in live and neutral

    Thanks.. ..We are seeking a "square law" ferrite torroid to use as a fluxgate sensor for imbalance current detection. For 50Hz mains electricity. No manufacturer seems to make these. I tried Far-rite, Mag-inc, Ferroxcube and TDK, but no joy. Plenty of high permeability (eg 5000), but no "square...
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    Measuring difference between current in live and neutral

    Thanks, thats right, and the voltage that gets looked at, is simply the voltage across a low value resistor in series with the coil.....(its put in series with the coil "gnd" connection and ground)........and you then see either a symetircal waveform if no DC and no imbalance...or otherwise its...
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    Capacitor at output of opamp

    Thanks, page 12 of the article kindly given by Dana shows also a cap at opamp output, just with a diode inbetween https://www.site.uottawa.ca/~rhabash/ELG4135L8.pdf ...thanks, and we are wondering whether it will latch low and then oscillate?...as you know, an opamp isnt generally allowed to...

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