treez
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Today, 11:10treez replied to a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignThankyou very much for your advice, i have just re-done it for one comparator...and no negative supply needed, as attached LTspice sim and pdf...9 replies | 191 view(s) -
Today, 10:47treez replied to a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignThankyou for the advice. We have now done it with comparators with some hysteresis as attached.(LTspice sim and pdf schem) Though i fear we...9 replies | 191 view(s)
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Today, 07:35treez replied to a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignThanks, I think we will do it with comparators....we will need hysteresis to stop chattering , which will mean an offset in the pulse from which we...9 replies | 191 view(s)
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Yesterday, 20:35Please try my course in SMPS, it helps with such details https://drive.google.com/open?id=0B7aRNbu3Fes4TU92Mkw3YlA3ams31 replies | 2007 view(s)
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Yesterday, 18:55treez started a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignHi, We need an accurate mains zero crossing detector, but cannot use "wear-out" components such as opto-couplers. Do you agree that the attached...9 replies | 191 view(s)
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Yesterday, 12:05treez started a thread Where are resistors on 8 x resistor array? in PCB Routing Schematic Layout software and SimulationFor the “CAY-16 J8” resistor (8 resistors on a chip), do you know if the resistors are where the “concave” bits are, or where the “straight” bits...2 replies | 139 view(s)
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Yesterday, 10:15treez replied to a thread Ramping a reference voltage up from, or down to zero volts, over ~200us in Analog Circuit DesignThanks, Klaus your solution looks great, i will try it now. I had come up with the attached (LTspice sim and pdf schem) but it is not as good as...6 replies | 255 view(s)
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Yesterday, 07:22treez replied to a thread Ramping a reference voltage up from, or down to zero volts, over ~200us in Analog Circuit DesignThanks, i think we will need a negatiove supply to get a good ramp down from 0.5V..6 replies | 255 view(s)
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26th January 2020, 21:14treez started a thread Ramping a reference voltage up from, or down to zero volts, over ~200us in Analog Circuit DesignHi, Please assist us in ramping a reference voltage down to zero volts, or back up to the reference voltage. This being done at random times, on...6 replies | 255 view(s)
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26th January 2020, 19:39treez replied to a thread Circuitry to make Paralleled Buck converters share current. in Power ElectronicsThanks, this sounds excellent....i like LLC for high voltage outputs like 150V+...because the LLC suffers no overvoltage ringing to its secondary...11 replies | 326 view(s)
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26th January 2020, 19:19treez replied to a thread Circuitry to make Paralleled Buck converters share current. in Power ElectronicsThanks, so you are saying that the feedback loop bandwith of the "master" and the "slaves" of the attached could all actually be the same, and this...11 replies | 326 view(s)
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26th January 2020, 18:00treez replied to a thread Circuitry to make Paralleled Buck converters share current. in Power ElectronicsThanks, yes I agree with you in the specific example which you give here..ie the “inner current loop of a current mode controller”…..but isn’t the...11 replies | 326 view(s)
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26th January 2020, 16:05treez replied to a thread Circuitry to make Paralleled Buck converters share current. in Power ElectronicsThanks Klaus, Yes the “master-slave” method, with master regulating voltage , and slaves regulating to the master’s current , is like in the...11 replies | 326 view(s)
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26th January 2020, 13:26treez started a thread Circuitry to make Paralleled Buck converters share current. in Power ElectronicsHi The attached (LTspice sim and pdf schem) is two paralleled Buck converters. Please assist us in making out the circuitry required to make...11 replies | 326 view(s)
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25th January 2020, 21:21treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic Questionsgood questions, we dont know though, since this has just been leaked.....weve only heard this little bit for now. I like the idea of the "spilt up...18 replies | 1042 view(s)
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25th January 2020, 00:42if you want a general idea, (theres no real formulae for it), then think of your power level, ...says its a 60w flyback...then check out app notes...9 replies | 475 view(s)
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24th January 2020, 23:44treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsFor a 56kg tethered drone consuming 12.5kW and using an 800vdc feed from the ground based power supply…what voltage would you say was chosen for ...18 replies | 1042 view(s)
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24th January 2020, 22:42treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsThanks, this is a good point, because I can imagine that if there are say eight or so open-loop synchronous Buck converters supplying the same load...18 replies | 637 view(s)
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22nd January 2020, 16:20treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsThanks, no testing as yet...though i believe that we will be clewar of current hogging problems with this parallel open loop Buck. I stepped the...18 replies | 637 view(s)
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22nd January 2020, 12:07treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsThe following looks good for high input voltage…..its two LLC converters in series, but they share the one transformer and the one resonant...18 replies | 637 view(s)
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22nd January 2020, 09:56treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power Electronicsyes the sim works, but there are some ~3ns spikes in the sync fet up to 20A, i presume this could be a simulator thing though...maybe the internal...18 replies | 637 view(s)
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22nd January 2020, 00:04treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsHi Thanks, the attached (schem and ltspirce sim) is a Dual Buck with the last stage with a sync fet and at 50kHz. I added a comparator to the...18 replies | 637 view(s)
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21st January 2020, 07:13treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, i appreciate they wont ever generate back, and will always be running significant power, but wondered what generally the total power range...18 replies | 1042 view(s)
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20th January 2020, 21:54treez replied to a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsThanks yes, the Dual cascaded Buck…all from one controller…..this looks a good shot. No problems with control loops fighting. I could only do it...18 replies | 637 view(s)
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20th January 2020, 21:28treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, If a drone is up in the sky, and is then brought down to land.......then whilst it is coming down, what power are the motors running...18 replies | 1042 view(s)
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19th January 2020, 21:24treez started a thread LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation needed in Power ElectronicsHi, Do you agree that the LLC converter would be more efficient for the above case? Consider synchronous rectifiers in each case. The Buck would...18 replies | 637 view(s)
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19th January 2020, 17:22On page 9 of the book “Power supply design, Volume 1 Control” by Dr Ridley, he states that a Full Bridge converter is good for power levels from 200w...3 replies | 275 view(s)
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19th January 2020, 15:37treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, we are looking for a offtheshelf 200w-500w BLDC motor which takes Vin of 400V or more but cannot find one, do you know why this is? There...18 replies | 1042 view(s)
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19th January 2020, 11:34treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, i am wondering if it can be done the other way concerning the motors.......ie, high voltage and lower current? - - - Updated - - - Hi...18 replies | 1042 view(s)
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18th January 2020, 22:20We have discussed here how Current mode control can’t be used in a half bridge SMPS. However, the following document states that a “Current Doubler...9 replies | 996 view(s)
About treez
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- April 5, 1982 (37)
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