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Recent content by cupoftea

  1. C

    PSFB output ripple current issue

    When you put the battery load on...there will be loads of ripple going into it...because it is an enormous capacitor. So i wouldnt be worrying about ripple here.
  2. C

    PSFB output ripple current issue

    When you say "current ripple", presumably you mean the ripple in the load current, ie, that current that is going into your eLoad? This is to do with the way that eloads work.....they arent like load resistors...they actually have the appearance of a capacitance....and that is why you see the...
  3. C

    LLC charger for wide range of battery voltages

    We have a primary side current sense transformer...and the ICE2HS01G will pretty much shut it down if output diode goes short. AYK, the shorted output diode problem is just as bad whether doing an LLC with output voltage regulation, or output current regulation.....so we have at least some...
  4. C

    What type of voltage regulators to use to get +10V/0.7A, -10v/0.7A, +5v/1A and +3.3V/2A DC outputs from a 24v/5A DC source?

    Also, you could go to digikey.com, and type in "DCDC converters" in the search field...then find your wanted power supply.
  5. C

    What type of voltage regulators to use to get +10V/0.7A, -10v/0.7A, +5v/1A and +3.3V/2A DC outputs from a 24v/5A DC source?

    Use Buck for the positive ones. Use Cuk or Flyback for the negative ones. Unless you need isolation in all cases, whereby use flyback for all. Multi output can suffer regulation problems......say of the regulated winding goes on no load etc etc. Cross regulation can be poor with multi.
  6. C

    Three phase PFC.....DCM near zero cross

    Thanks, sounds easier than single phase PFC, which seems counter intuitive.
  7. C

    Three phase PFC.....DCM near zero cross

    Thanks, so when in light load, you just keep the sinusoidal PWM going, and the average inductor current just automatically goes to zero...ie, the inductor current just shuttles back and forth?, (just like in a sync Buck with continuous PWM) since there's no load.
  8. C

    LLC charger for wide range of battery voltages

    Thnaks, no only between 50-100khz. And we beleive that when we do a current regulated output...the frequency will automatically go to the requisiste frequency. (ICE2HS01G controller)
  9. C

    Three phase PFC.....DCM near zero cross

    Hi, Woudl you agree the drive of the upper fets will need care at the phase zero crossings, otherwise reverse current flow could flow in the PFC inductors, when the inductor current goes DCM? In this thread, #3...
  10. C

    LLC charger for wide range of battery voltages

    Hi, The attached shows the Vout vs Freq graph for a 2kW LLC. (Half Bridge) Vin is 390VDC. It shows that between 50khz and 100khz, you can charge a wide range of battery voltages. As such, i believe LLC is the best charging method for high voltage batterys, would you agree? The LLC, with Full...
  11. C

    Load sharing Boost SMPS's swap the load repeatedly

    Aaaah....the attached (LTspice and jpeg) appears to have cracked it.....the secret was just to limit the range of voltages to the error amp ref. So would you say the attached is the best way to do it? If not limited, then they both just drag the refs down to min. 1664127565 Also it is seen...
  12. C

    Ir2110 replacement with fan7380

    FAN7380 has very weak drive...said to be for CF lamps etc.
  13. C

    Ir2110 replacement with fan7380

    FAN7380 https://www.onsemi.com/pdf/datasheet/fan7380-d.pdf IR2110 https://www.infineon.com/dgdl/Infineon-IR2110-DataSheet-v01_00-EN.pdf?fileId=5546d462533600a4015355c80333167e Here is a similar thread on IR2*** drivers...
  14. C

    Load sharing Boost SMPS's swap the load repeatedly

    EDIT...the attached works quite well, settling out after a while quite equally...but i forgot to connect up the top current equalisation error amp properly...so it works, but is wrongly connected up ....END OF EDIT Yes, i think the integrator that deals with equalising the currents should be of...
  15. C

    Load sharing Boost SMPS's swap the load repeatedly

    ...In the UC3902 App Note examples, the UC3902 does indeed operate exactly as you say...however, AYK, it can also be set up to act on the reference voltage of each error amplifier of each power stage. I appreciate the example i give in top post is a little contrived, but i still wish to...
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