Max power through a hipFlex- Mtbr.com
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  1. #1
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    Max power through a hipFlex

    Hello

    I cant seem to get onto the Taskled website and need a little info. Basically, can I draw 56W through the hipFlex?? ie 2.8A and 19.8v output? I realise this will need uber heatsinking! Will this be reliable?
    If not, can you recommend another driver to use?!

    I want to make a one off silly bright light to satisfy my craving then I will calm down!!

    Thanks for any help
    Andrew

  2. #2
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    Andrew
    Drop me an email and I will send you the hipflex manual if you want it.

  3. #3
    aka Chris
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    TaskLED.com is backup for me and I can get the manual here:

    http://www.taskled.com/leds/hipflexuni.pdf
    The Novice's LED Light Building Blog

  4. #4
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    Thanks Chris and Chris!

    I have the hipFlex.pdf and it says...
    1 to 5 P7 (in series) 24 V
    1 to 5 MC-E (4P) 24 V
    1 to 3 MC-E (2P2S) 24 V

    However, can I run 6 MC-E in 4P6S?? 4 Strings of 6 dies? If the Vf of the die is ~3.3v my total Vf will be ~19.8V. At 2.8A so each die sees 700mA. I'll be using a 22.2v Li-ion to power it.
    Therefore my total power is ~55.8W.

    Is this feasible or is this simply too much for the hipFlex? Or would 2 drivers be a better option? If so, any ideas?!

    Thanks again

  5. #5
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    However, can I run 6 MC-E in 4P6S?? 4 Strings of 6 dies? If the Vf of the die is ~3.3v my total Vf will be ~19.8V. At 2.8A so each die sees 700mA
    each string will see 700ma ......... not each die
    ...Scun.thorpe, UK

  6. #6
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    Hendo - I get 700mA per die given an ideal current source... can you please explain your logic? The breakout is symmetric and parallel, so how do you find each die in a string does not carry the string current?

  7. #7
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    4 Strings of 6 dies?
    Is this feasible or is this simply too much for the hipFlex?
    hipFlex max current = 2.8A / 4 strings (of 6 dies) =700ma per string (of 6 dies)
    Last edited by HEY HEY ITS HENDO; 06-06-2009 at 03:28 PM.
    ...Scun.thorpe, UK

  8. #8
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    Quote Originally Posted by HEY HEY ITS HENDO
    hipFlex max current = 2.8A / 4 strings (of 6 dies) =700ma per string (of 6 dies)
    Cool. So how much current do you calculate per die if not 700ma? I thought current would be conserved along a string of dies when wired in series?

    Thanks,
    -b

  9. #9
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    Quote Originally Posted by ca_rider
    Cool. So how much current do you calculate per die if not 700ma? I thought current would be conserved along a string of dies when wired in series?

    Thanks,
    -b
    Yeah, I worked it out at 700mA per die too.

    So do you reckon I hipFlex can handle 56W?? I may have to wait for George to get back!

  10. #10
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    I may have to wait for George to get back!
    lol, you don`t believe me eh!
    we can work this out easily
    hipFlex spec ........ max volt in =24v, max current out = 2.8A
    if you want to drive 6 x MC-E then ahhaah ....
    ......[edit]4p6s THIS IS NOT 4 STRINGS (this statement threw me)
    each MC-E 4 die parallel------ 6 MC-E
    =one string of 6 leds, does this make sense?
    ...Scun.thorpe, UK

  11. #11
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    Ive got a headache after thinking about this one, but I think this is what Piesoup had in mind.....
    nightmare2wire.jpg

    Each die (and string) would indeed see 700ma

    Rather you than me! Very fiddly to solder all that up......GREEDY BOY

  12. #12
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    the (4) MC-E dies will be joined in parallel
    you can buy these parallel ready
    the 6 will be joined in series

    22.2v Li-ion to power it.
    ....... fully charged voltage is?? .........
    ...Scun.thorpe, UK

  13. #13
    Homer
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    6 series li-ion should be 25,2V off the charger.

    Quote Originally Posted by HEY HEY ITS HENDO
    the (4) MC-E dies will be joined in parallel
    you can buy these parallel ready
    the 6 will be joined in series


    ....... fully charged voltage is?? .........
    Need optics for DIY bike lights?

  14. #14
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    yep, thats what i was thinking too brum ...
    The IN+ hole (bottom right corner) and IN- (middle right) are the input power connections to hipFlex. 24V MAXIMUM input voltage.
    piesoup .....looks like your gonna need 2 drivers and a 5s2p battery ( 5cell x 2)
    ...Scun.thorpe, UK

  15. #15
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    Hendo, I still don't understand your response to my question. Can you please elaborate?

    Given the proposed hardware, I would arrange it as 6p4s. This gives 2.8A/6_leds=467mA each. Referencing the MC-E pdf, this gives a 3.35V drop across the leds. With 4 sets of 6 leds in parallel, this yields a total voltage drop across the array of 4*3.35V=13.4V. The total electrical power drawn is 0.467A*6_leds*4_sets*3.35V_per_set=37.5W. Note the power and voltage requirements are satisfied by a single hipflex and the specified battery pack. Referencing the hipflex pdf, 467mA yields 125% luminous flux which is 370lm for group K using all 4 elements. So in this case total luminous flux would be 125%*6_MC-Es*370lm_per_MC-E=2775lm.

    Cheers,
    -b

  16. #16
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    Quote Originally Posted by bumphumper
    Ive got a headache after thinking about this one, but I think this is what Piesoup had in mind.....
    nightmare2wire.jpg

    Each die (and string) would indeed see 700ma

    Rather you than me! Very fiddly to solder all that up......GREEDY BOY

    Spot on, thats how I drew it too. It will be some fiddly soldering but I think I can manage that! With individual die access I will be able to achieve that circuit.
    So, I would still have a P out of ~56W and 4410lm. 78.75lm per Watt.

    However, I have got M bin which will be 125% * 6 * 420lm = 3150lm. 84lm per Watt. I think I may be satisfied with that!! Thanks ca_rider, I may go with your proposed set up!

    Yes a fully charged battery pack will be 25.2v so I may use a 5 cell li-ion, with a max of 21v. I'll most probably end up using the light at a lower current most of the time so the driver wont be working flat out all the time.

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