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Recent content by 24vtingle

  1. 2

    The GaN revolution must now happen?

    The LLC and PSFB modes are well known....in cases of load transient, output short circuit, startup, etc etc...the LLC and PSFB have weaknesses in terms of their failure modes. These failure modes are not seen in Hard switched full bridge and half bridge etc. The LLC and PSFB failure modes are...
  2. 2

    Request for Flyback Controller Recommendations (24V Input / 18V Output, 20W)

    Probably not, too much rds(on)
  3. 2

    Looking for feedback on my bike-powered circuit using supercapacitors – electronics student in an internship without technical supervision

    You will need balancing cctry for the supercaps, and overvoltage protection for them. You need to do a test first to see what max voltage you will get out of the generator.
  4. 2

    Request for Flyback Controller Recommendations (24V Input / 18V Output, 20W)

    Yes, and LM5021 is a nice price with overload protection. LTC1871 is more pricey but nice 0.1v sense threshold. UCC38C43 UCC38C4X UCC38C5X HV9910B NCP1217 NCP1230 In some cases, if the CS pin threshold is too high, eg 1V, then you can bias it up to reduce the sense resistor dissipation
  5. 2

    High voltage DC distribution not allowed?

    I presume this woudl be ok for 100V and jet water spray environment? https://www.alibaba.com/product-detail/L16-IP68-Waterproof-Connector-2-3_1601379400263.html?s=p ..it says ip68 so presume ip68 even tho' 100v?
  6. 2

    High voltage DC distribution not allowed?

    Thanks, that might be how they're getting round it...because presumably the cables plastic sheath is "suitable insulation"? And also, the connector into each LED driver is the other place where you could get contact, but presumably you can get standards_compliant connectors which give you an...
  7. 2

    push pull converter

    OK, so when you turn ON a FET, the current gradually transfers out of the one fet to the other...and due to the added inductor (L1 or L2), the current builds up from zero, so you get ZCS.... ...But of course then you are suffering because when you turn the FET off.....then you are breaking the...
  8. 2

    push pull converter

    Or indeed, put it in the free LTspice simulator and send if you can?
  9. 2

    High voltage DC distribution not allowed?

    Hi, Our competitors in Vertical farming are cheating. (or so we believe?) They are using an isolated 100VDC bus to distribute the power bus to the LED drivers. So they take in the mains...then they have a 1kW Boost PFC stage near the mains incoming panel. They then use LLC to get 100V at...
  10. 2

    push pull converter

    So the above is the current in a FET and the Vds voltage of that FET is in Blue? (what's the time base?) Is the blue scale going from 0 to 200V ? Why is there no ramp on the current?.....an inductive current in an SMPS would be ramping up and down. Why do you have to get that voltage to zero as...
  11. 2

    Phase Shift Full Bridge suffers spurious FET turn_ON

    Well yes, we have to follow the datasheet of NV6127 https://navitassemi.com/wp-content/uploads/2022/04/NV6127-Datasheet-FINAL-04-11-22.pdf ...So we must use the slow dVds/dt setting (10 ohms) and ensure that the DZ pin is within 5.8-6.2v...and that Vdd pin is at 5V before any switching...
  12. 2

    Phase Shift Full Bridge suffers spurious FET turn_ON

    Thanks, but even if the software is written well, who wants a general offline PSU that needs control software? Cheaper to just use the GaN/SiC idea that i present. -And forget the software, and its maintenance cost etc etc.
  13. 2

    Phase Shift Full Bridge suffers spurious FET turn_ON

    Thanks, the "engineering" required , in the case of the LLC, in order to avoid the failure modes, is as on page 56, 57 of the following...
  14. 2

    push pull converter

    For the transformer leakage energy, you could use a diode and capacitor to catch it, and then a little flyback smps to feed off that and keep draining it down so you dont get overvolts.....ie, a kind of active snubber. Otherwise, if those leakage inductances are small, you could just use an RCD...
  15. 2

    The GaN revolution must now happen?

    Yes but i do not believe that that's relevant in this discussion.... After all, in say a Full Bridge SMPS, the current in each FET is limited by fast current limit...so there would never be a 5us short circuit current in any FET. But yes, if you are talking "ruggedness"...then we would all...
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