treez
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Today, 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...16 replies | 367 view(s) -
Today, 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...16 replies | 367 view(s)
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Today, 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...16 replies | 367 view(s)
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Today, 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...16 replies | 367 view(s)
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Yesterday, 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...11 replies | 534 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...16 replies | 367 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...11 replies | 534 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...16 replies | 367 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 | 210 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...11 replies | 534 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...11 replies | 534 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 | 930 view(s)
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18th January 2020, 21:55treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, no we didnt, but we will parallel them.37 replies | 1979 view(s)
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18th January 2020, 13:59treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, we will end up using back-to-back power FETs with isolated drive due to the total 32A of current. We will parallel them. What worries us...37 replies | 1979 view(s)
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18th January 2020, 12:02treez replied to a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsThanks, Ill try the "common mode" test5 replies | 324 view(s)
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18th January 2020, 11:27treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, i suppose there is no power supply on the "tethered drone"?...just the BLDC inverters...which must us high voltage IGBTs?.... Maybe somne...11 replies | 534 view(s)
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17th January 2020, 20:29treez started a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsHi, Regarding tethered drones such as the LIGH-T 4, which is rated at 1.2kW…. https://elistair.com/ligh-t-tethered-station-for-drone/ Do you...11 replies | 534 view(s)
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15th January 2020, 22:15treez replied to a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsThanks, it seems a little odd that in the datasheet "ABS MAX's" it says the SW pin should be no higher than "vin+0.3v".......whereas the vin pin can...5 replies | 324 view(s)
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15th January 2020, 21:44treez started a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsHi, We are using the LM5019 for a Buck converter Vin = 60V Vout = 12V Iout = 7mA We notice a spike on the LM5019 drain voltage of 20V in...5 replies | 324 view(s)
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12th January 2020, 18:34treez replied to a thread ZMR330: 3V3 Linear regulator needs diode connected cathode to input voltage? in Elementary Electronic QuestionsThanks, i mean a diode connected anode to output, cathode to input... in the old days, such a diode was always needed to protect the regulator in...6 replies | 476 view(s)
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12th January 2020, 14:50treez started a thread ZMR330: 3V3 Linear regulator needs diode connected cathode to input voltage? in Elementary Electronic QuestionsHi, Question as per title. ZMR330 datasheet https://www.diodes.com/assets/Datasheets/ZMRSERIES.pdf ..the datasheet doesnt say such a diode is...6 replies | 476 view(s)
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12th January 2020, 11:54treez replied to a thread Resistor at input to high side current monitor IC in Elementary Electronic QuestionsThanks yes, We have Rsense = 0R75, RA=1k and RB=3k3. I made RP=43k and readings (voltage on RB) were badly inaccurate. Now that we have RP=RA,...3 replies | 358 view(s)
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12th January 2020, 00:30treez started a thread Resistor at input to high side current monitor IC in Elementary Electronic QuestionsHi, Should resistor RP on page 1 of the HV7802 datasheet ideally be equal to the value of RA? HV7802 datasheet...3 replies | 358 view(s)
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11th January 2020, 00:55Hi, In the attached schematic, I had been soldering components on and off the board many times, in the vicinity of this circuit. On some...3 replies | 362 view(s)
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5th January 2020, 19:54treez replied to a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic Questionsi agree its low energy, though cant it spark off oxidation in the contacts? Also, the damage is cumulative, and the contact chrome coating is...7 replies | 580 view(s)
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5th January 2020, 18:00treez replied to a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic QuestionsThanks, by "contact opening time" you are speaking of "contact bouncing time"? I believe we would agree that an ideal world resistive circuit,...7 replies | 580 view(s)
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5th January 2020, 14:59treez started a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic QuestionsHi, The below switch says its rated for 10000 operations. But does that mean 10000 operations with the switching happening at the zero crossings, or...7 replies | 580 view(s)
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4th January 2020, 21:50treez replied to a thread Is this the reason there's so few 2 Transistor Fwd Sync Rect controllers? in Power ElectronicsActrually, adding RCD clamps across the sync FETs does solve the problem with the LT1681/LTC1698 combo. (As attached LTspice sim and pdf.) In...3 replies | 417 view(s)
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4th January 2020, 18:05treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, what we actually have on the pcb is the schem in #18 ...we are currently wangling it to be as the schem in #17 (by not fitting the bjt...22 replies | 1790 view(s)
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4th January 2020, 16:47treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, yes, Thanks for them, but we dont have money for a pcb respin...and so are trying to wangle what we have.22 replies | 1790 view(s)
About treez
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- April 5, 1982 (37)
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- football, cycling
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