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  1. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    beware static damage too ...
  2. Closed: Re: SPWM Inverter Calculate DC bus current

    220Vac rms is 311 Vpk, a 320V bus is a little light for this, the DC bus current will be the average current flowing to the load:

    for 2.5A rms, assuming all real power, the Po = 220x2.5...
  3. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    Well spotted Danie.

    We all look forward to hearing what clears up the issues ...
  4. Closed: Re: Loop Compensation Characteristics with Degraded parts in Boost PFC.

    if the diode degrades => Bang..! Ditto for the mosfet ...
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    Closed: Re: Best topology DCDC adjustable output

    only one choke is needed at the top - you can put a choke in the neg for balance and more CM filtering if you wish - but not needed

    there is not a TVS across each bridge - only the lower one...
  6. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    you have a loop issue at 2kHz, you need more phase lead at 1kHz ...
  7. Closed: Re: Loop Compensation Characteristics with Degraded parts in Boost PFC.

    over time the E cap will lose capacitance and the ESR will go up - depending on how hard it is used ( rms current ) losing capacitance means the 100/120 Hz ripple will go up - but the o/p will...
  8. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    according to the graph in the data sheet you can have up to 0.5V and 100% I, ( 10A ) this is 5W in the P-fet, even 2W in the P-fet may cook it ...

    - - - Updated - - -

    also - just looking...
  9. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    Keep checking between old and new boards - read the data sheet and the app notes carefully ...!

    - - - Updated - - -

    Two things from the data sheet: 1) if a PowerPath FET is not being used,...
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    Closed: Re: Current Transducer Test Rig - Doubts

    Easy enough to have made a 230V single phase Tx with an open sec that you can put a single turn thru to get 3kA, then control from the Variac - 3kA DC is a different matter - ideally you...
  11. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    you've got more damping at the higher loads - looking at the pictures
  12. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    you can put a zener on the P Fet and a current limiting resistor in series to the gate - ( 28-15 )/10mA = 1k3, say 1k5 - it doesn't need to turn on/off fast ?
  13. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    bad parts? could put a 2k2 from g-source on the P-fets - just to help out ...

    slowing the soft start should help to find the p fet problem ... keep comparing to original lash up - ...
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    Closed: Re: Best topology DCDC adjustable output

    also you don't need the lower o/p choke

    TVS should go directly across each bridge rect o/p - but if triggered they will likely go bang

    snubbers across all diodes, not the Tx

    film/foil...
  15. Closed: Re: can secondary inductance be determined from provided data

    Really you should describe the turns ratio as 1:85 i.e. pri to sec ... the sec L is the turns ratio squared times the pri L
  16. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    yes - they look good - at light load ...(!)
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    Closed: Re: EMI/EMC Compliance scheme

    see post #10
  18. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    you cannot probe the error amp output without introducing noise - or using a 10k resistor on the probe tip - there is a filtering effect - but you can see some thing...

    - - - Updated - - -...
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    Closed: Re: Sizing current sense resistor for CMC

    best to decide this under test ...
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    Closed: Re: Best topology DCDC adjustable output

    3856: pin 6 does not go to gnd, link 6 & 7 for a voltage follower
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    Closed: Re: Tip41c/42c arrangement problem

    you need to find xtors with much higher gain ...
  22. Closed: Re: Half-Bridge 0-30V, 0-20A Feedback loop problem

    looks like your power supply source is running out of steam and supplying ripple to the input ...
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    Closed: Re: Sizing current sense resistor for CMC

    you can easily work out the min slope comp you need above 50% duty cycle ( of maximum ) it has to be greater than half the inductor down slope ( referred to pri ) in the shunt ( giving V/ uS...
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    Closed: Re: Tip41c/42c arrangement problem

    TIP41A 42A has fairly low current gain - so you are asking a lot to drive it direct from a 555 ( esp a CMOS one ) - this is one of those ckt's that is not that flash ...
  25. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    Slow the soft start down so it takes ~2 sec to start, use the values in the app note for the control loop - i.e. the slower ones
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