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Old 01-31-2013, 08:55 PM #1
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Default Will adding a capacitor help my problem?

I am trying to drive a 1w diode with a 14500 battery, but the voltage cannot keep up and when it drops below 3v the driver shuts off.

Here is an image of the voltage over time on an ocillascope. If I add a cap to this will the laser stay on for longer, or is it just a matter of the battery not being able to supply the current needed?

I would like to use the smallest cap possible so it fits in my build, but it seems that they come in sizes up to 5F (holy shit!) for the voltage range that I am using.

Here's the graph (sorry I forgot to post it at first)



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Old 01-31-2013, 09:30 PM #2
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Default Re: Will adding a capacitor help my problem?

What is the driver ? You can actually direct drive the M140 diode with a 3.7Volt cell. A member did that without problem. I forgot his name. The laser won't be regulating of course.
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Old 02-01-2013, 03:54 AM #3
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Default Re: Will adding a capacitor help my problem?

Weegidy;

I am that LPF member that drove the 445nm laser diode directly with a #18650 cell @ 600ma:

Direct-Drive 445 Host

I also think you need a #18650 cell to supply the power for your current driver.

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Old 02-01-2013, 04:29 AM #4
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Default Re: Will adding a capacitor help my problem?

That's a neat build for sure, but I am trying to make something really little. I tried adding a 100μF cap to my 14500 - but the result was identical. I have a 1Farad cap at school I can try out tomorrow and see if there is any improvment with that. It looks like an IMR 14500 just cant keep 3volts when under that load.
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Old 02-01-2013, 04:53 AM #5
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Default Re: Will adding a capacitor help my problem?

Adding a capacitor won't solve the problem.

Seems like the cell isn't supplying enough current. Either the driver's undervoltage protection is kicking in or it's the cell's PCB.

Having a charged 5F cap as an additional power supply may keep the voltage up for a few seconds, but it still will drop rapidly.

Is this a boost driver?
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Old 02-01-2013, 05:33 AM #6
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Default Re: Will adding a capacitor help my problem?

Quote:
Originally Posted by ryansoh3 View Post
Adding a capacitor won't solve the problem.

Seems like the cell isn't supplying enough current. Either the driver's undervoltage protection is kicking in or it's the cell's PCB.

Having a charged 5F cap as an additional power supply may keep the voltage up for a few seconds, but it still will drop rapidly.

Is this a boost driver?
It is not a boost driver. It is a very minimalist driver (I did not make it myself) - it has a 3 to 5 volt range, so I can't use 2 lithium cells

It's not the cell that is stopping the laser because I am using an IMR cell that can really supply like crazy for how small it is (not to mention that they are not protected). Even when the laser starts to flicker the cells are not yet warm to the touch. I run 10Watt XMLs off of these same cells with no problem (and they do get warm), so I am pretty baffled that they can't support my 1W laser. I guess the LED drivers I use have boost regulators...

What if I were to use an LED driver with my laser before my laser's driver? It wouldn't be so efficient, but the LED driver could keep the voltage up for the Laser's driver... It sounds crazy, but could it work?
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Old 02-01-2013, 05:58 AM #7
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Default Re: Will adding a capacitor help my problem?

If you're not using a boost driver, the only thing the driver's going to do is drop the voltage even further. So, it's better not to use one at all IMHO.
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Old 02-02-2013, 05:03 PM #8
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Default Re: Will adding a capacitor help my problem?

A cap will not help. Use a larger cell.
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