Badboy makes 9.

[dat2zip]

Well, the Badboy is not 9 years old. In another thread here I posted the following pictures.

The second picture has 6 used 1W LDs wired in series as the test load for the Badboy 400. Modifications to the Badboy were only to change the 10V rated output cap and substitute in a 25V rating capacitor.

You can see the voltage and current the Badboy is drawing from the power supply. That's 9W!!! At 85% efficiency there is 7.6W spread across the 6 Luxeons. The probe connected to the output wires allows me to measure accurately the current flowing to the Luxeons and it was 400mA.

Just some food for thought. Mega lights... One Badboy like this and array of 4-6 1W on a nice heat sink in a 3C cell light would make a nice flood light with reasonable run time.

Wayne

 

[tvodrd]

Cool Wayne! (I'm eventually gonna run out of ways to go smaller. /ubbthreads/images/graemlins/grin.gif )

Larry

 

[kakster]

Will it be able to deliver that much juice into a single Luxeon?

 

[dat2zip]

It's only driving 400mA to the string of LEDs on the output.

 

[kj]

Maybe we can rewire ElektroLumens Tri-Star and use it?

 

[Otokoyama]

Could a similarly modified "BB1000" (blank with two 0.1 ohm resistors + 25V capacitor) drive 3 Lux IIIs wired in series off 2.4V (either 2 x NiMH D cells or 2 x 4 x NiMH AA cells in parallel) and deliver 1A to each emitter? Would the batteries provide sufficient current to do the job?

 

[dat2zip]

The resistor calculator that I have created also has a runtime estimate for Badboy. It's the last set of fields at:

http://www.anlighten.shop/test.php

The input screen for this one looks like:

The computed screen showed this:

You can enter the Vf, Vin, Iout, and Amp/HR battery capacity.

The resultant screen will tell you the estimated drop out voltage and if the configuration is a valid one.

 

[AilSnail]

Otok, the input voltage is too low. The badboy can't suck more than 1.5 A from the batteries. Supposing that you are set on the form factor, I suggest you do like you proposed in the other thread, use 8 nimh in series for 9.6 volts. It would be pretty close to the output voltage of the converter, which is good for efficiency. I think rechargeables have no problem supplying 1-1.5A. You might want to change the cap though, to be certain.

 

[Otokoyama]

dat2zip: Thanks for pointing out the validity checking part of the resistor calculator. If I enter 1 Amp, 11.4 Vf (3 Lux IIIs in series x 3.8), 9.6 V (8 x 1.2 NiMH), and 2.3 Amp/Hr, I get:[ QUOTE ]
The computed run time is 1.6140350877193 Hours

This configuration is rather iffy with a Badboy since 9.6 is just above the drop out point of 9.12 Volts


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[/ QUOTE ]The NiMH should hold their voltage at 9.6 until near exhaustion. It sounds like the BB1000 should work perfectly. Right?

AilSnail: Thanks for your response here and in the other thread.

 

[dat2zip]

Yes, with the one exception. The output cap would need to be changed to a 16V or 25V version. Both the input and output caps are rated for 10V. I would think the input cap is fine at 9.6V and the output might work. But, I wouldn't push the component specifications and changing the capacitor only makes sense.

Wayne

 

[Otokoyama]

1.6 hours runtime driving 3 Lux IIIs is exactly what I'm looking for!

Could you make a special BB1000 with an upgraded output capacitor? Please PM or email price if possible.

Last question: For 12 x AA NiMH, could I use a stock DB1000 (blank with appropriate resistors)? The problem might be that the maximum voltage after charging is 16.8V, greater than the rated DB maximum of 16V.

 

[Doug S]

[ QUOTE ]
dat2zip said:
Yes, with the one exception. The output cap would need to be changed to a 16V or 25V version. Both the input and output caps are rated for 10V. I would think the input cap is fine at 9.6V and the output might work. But, I wouldn't push the component specifications and changing the capacitor only makes sense.

Wayne

[/ QUOTE ]
Hi Wayne, this may give you a little comfort concerning overvolting ceramic caps. I am assuming that you are using XR5 dielectric caps on your boards. I was recently reviewing the test specs on the Panasonic MLCC series XR5 dielectric caps. Their specs include a 2.5X 1 minute applied overvoltage and a 2X 1000 hours applied overvoltage. These seem to be pretty robust! I don't know to what extent one can extrapolate these specs to other ceramic dielectrics or other manufacturers.