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Discussion in 'Electronic Design' started by Raveninghorde, Nov 27, 2008.

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  1. Anyone know a good supplier of off the shelf inductors?

    I'm doing a battery charger design using a sepic converter. Got a daft
    spec to meet of -55C storage with 0C to 45C operation.

    All the specs I've checked give -40C for storage though one from
    Coilcraft also gave -55C for operation??

    I've tried Coiltronics, Coilcraft and Weurth.
  2. Phil Allison

    Phil Allison Guest


    ** Seems to me that even a well performing PSU might be damaged by
    attempting to use it when its temp is -55C.

    Better fit something that DISABLES the unit whenever the internal temp is
    to low for safe operation - like a normally open bi-metal switch that
    closes at 0C.

    ..... Phil
  3. Could be limited by the battery rating.

    Best regards,
    Spehro Pefhany
  4. Many military batteries charge below 0C. For example Saft do some NiCd
    cells which can be charged at -40C and are used in some UK batteries.

    I found API Delevan do some standard inductors that will work.
    Unfortunately I haven't found a coupled sepic inductor yet.
  5. Phil Allison

    Phil Allison Guest


    ** Kindly provide a link for that assertion - pal .

    Since AFAIK it is IMPOSSIBLE to recharge a NiCd cell at a temp below
    zero C.

    Cos the little fuckers have got a crucial, tiny bit of water inside them
    which MUST be in the liquid state.

    Over to YOU ...

    ..... Phil
  6. Having checked my facts, the battery I was thinking about is specified
    to charge at -31C not -40C.

    I'll add no more due to commercial sensitivity.
  7. Phil Allison

    Phil Allison Guest

    "Martin Brown Just Shat Himself "

    ** Who give a flying **** ?????????????

    you ridiculous MASTURBATING BLOODY IDIOT !!

    ALL NiCd makers warn NOT to attempt charging cells below 0C



    So go DROP DEAD

    - you pathetic, ASD fucked moron !!!!!!!!!!

    ..... Phil
  8. Phil Allison

    Phil Allison Guest


    ** Why don't lying, know nothing, fucking trolling CUNTS like YOU

    just go and get totally fucked ??

    Eh ??

    ... Phil
  9. MooseFET

    MooseFET Guest

    Try I used some from them many years back
    that were inductors with two windings. You may have to work a little
    at getting a full spec sheet from them.
  10. Public info here:

    Section 25. 50 charge/discharge cycles. Test at -31C.

    Section 17.4 states charger at 20C, battery at test temperature, max
    charge time 5 hours.

    That's a battery for a 1980's radio.

    The batteries are available on Ebay if you want to see how they are
  11. PeterD

    PeterD Guest

    Or build in a small heater to keep the internal temperature above the
    'magic' number! Lucky for you, in Oz, it never gets that cold! <g>
  12. Phil Allison

    Phil Allison Guest

  13. Phil Allison

    Phil Allison Guest

    "Tim Wescott Moronic Wanker "
    ** That page, plus what is on page 9, backs up * 100% * what I posted here

    NiCd cells must not be charged below 0C.


    YOU are so mind numbingly fucking stupid

    - YOU cannot even read simple data sheet.

    Piss off and DROP DEAD.

    ...... Phil
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