*BLF Ultimate Lantern Project*~updates:Lexel building driver prototype)

3189 posts / 0 new
Last post
dmsoule
Offline
Last seen: 1 hour 17 min ago
Joined: 08/27/2016 - 20:14
Posts: 111
Location: MN USA

Please add me as well, thanks!

bobofire
bobofire's picture
Offline
Last seen: 2 months 3 weeks ago
Joined: 02/25/2015 - 09:38
Posts: 114
Location: USA

Looks like this would be useful…please add me to the list for one.

DBSAR
DBSAR's picture
Offline
Last seen: 11 hours 17 min ago
Joined: 02/11/2013 - 23:28
Posts: 5140
Location: Ontario, Canada
Lexel wrote:
I wish the lantern project would be a sort of addon to the Q8, I am sure with a proper reflective cone shaped on the top with a milky cylinrdical diffusor the light pattern would be great, without moving the LED on the top

Have tested more of the diffuser designs that I wished to count, (and abandoned all of them) some are ok, but not nearly as beneficial as a down-firing design for lantern use to minimizes eye-glare from the angles that most lanterns will be used. As Miller mentioned it’s a question that been answered many times. One example is i have a head i built to fit on top of a BLF SD-10 ( and other lights with the same sized head) that is very close to your drawing, but like most all types of flashlight diffuser heads of that style, sens eye-stinging glare to the eyes when carried like a lantern by a lanyard, or on a table that is lower than your horizontal plane of view. ( example, when resting on a low table beside chairs at a campsite, or a coffee table, when you look down at it you get the direct view of the LED and its piercing glare. ( which is even worse with the colder tints higher than 3700K.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DBSAR
DBSAR's picture
Offline
Last seen: 11 hours 17 min ago
Joined: 02/11/2013 - 23:28
Posts: 5140
Location: Ontario, Canada
angerdan wrote:
DBSAR wrote:
Indeed, there is tons of space above the driver in the mid-section to add the charger & USB bank electronics.
What about the option to add an optional wireless remote control&status modul (bluetooth) there?

Bluetooth remotes would just drive the price way to high, and to complex and a feature that many would never use. I have a couple remote control lanterns and the Manker Godmes Bluetooth flashlight. A feature rarely used.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

contigo
Offline
Last seen: 3 days 16 hours ago
Joined: 06/15/2016 - 17:17
Posts: 197

All im looking for in a lantern is:

- 4×18650 or 4×26650 (in parallel). Would be sweet if the battery compartment would be big enough to fit 26650s.

- UBS charging port to charge cell phone etc.

- Modes ranging from 5 lumens to around 500 lumens.

…………Just personal preferences

joeangi
Offline
Last seen: 10 months 3 weeks ago
Joined: 02/19/2016 - 20:02
Posts: 12

Please put me down as interested!

Angel Martínez
Offline
Last seen: 5 hours 33 min ago
Joined: 11/19/2010 - 14:43
Posts: 137

Please add me to the list

WaylonJennings
Offline
Last seen: 7 months 5 days ago
Joined: 05/16/2017 - 21:08
Posts: 210
Location: Elk Mound, Wisconsin
JasonWW wrote:
WaylonJennings wrote:
bbbbbbb
What!?

How did I do that?

ChibiM
ChibiM's picture
Offline
Last seen: 3 hours 9 min ago
Joined: 05/09/2011 - 10:25
Posts: 5832
Location: Holland/Japan

WaylonJennings wrote:
JasonWW wrote:
WaylonJennings wrote:
bbbbbbb
What!?
How did I do that?

I guess by pressing the letter b ?

ChibiM
ChibiM's picture
Offline
Last seen: 3 hours 9 min ago
Joined: 05/09/2011 - 10:25
Posts: 5832
Location: Holland/Japan

Im interested in seeing this going to become the first BLF-special lantern. Curious how this is going to look like.

WaylonJennings
Offline
Last seen: 7 months 5 days ago
Joined: 05/16/2017 - 21:08
Posts: 210
Location: Elk Mound, Wisconsin
ChibiM wrote:

WaylonJennings wrote:
JasonWW wrote:
WaylonJennings wrote:
bbbbbbb
What!?
How did I do that?

I guess by pressing the letter b ?

But usually I know that I did what I did. It’s the not knowing that makes me wonder.

ChibiM
ChibiM's picture
Offline
Last seen: 3 hours 9 min ago
Joined: 05/09/2011 - 10:25
Posts: 5832
Location: Holland/Japan

tongue-out 

DavidEF
DavidEF's picture
Offline
Last seen: 8 hours 37 min ago
Joined: 06/05/2014 - 06:00
Posts: 6330
Location: Salisbury, North Carolina, USA

JasonWW wrote:
I’m deleting my unnecessary posts.

What? Why? This is BLF! Let the unnecessary posts stay I say!

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

phosphor
Offline
Last seen: 1 month 1 week ago
Joined: 09/14/2012 - 23:37
Posts: 89
Location: PAC NW

I’m interested as well.

DEL
DEL's picture
Offline
Last seen: 8 months 3 weeks ago
Joined: 06/28/2015 - 08:35
Posts: 559
Location: Canada

Driver progress! We are still in design stage, so a few things will probably change before it is all said and done. But I am close to ordering boards and parts for a prototype.

Basic specifications for the stock setup:

  • Constant current drive to LED (no PWM), 0 to 1 A (can be bumped up to about 2 A with a resistor change)
  • Output can be adjusted in firmware with 4 mA resolution (255 steps over the 1 A range)
  • Firmware is TK’s domain and will probably be a flavor of Anduril
  • 2 A charging via a micro USB port. Cells over-voltage protection. Proper charging profile with 128 mA pre-charge, 256 mA charge termination. 4.208 V termination voltage with 0.5% accuracy.
  • Power-bank functionality: 2.1 A output for a phone or tablet via a standard USB port
  • 90%+ efficiency for charging and power-bank output buck/boost circuits.

Bottom half is the LED driver, top half the buck charger and 5 V booster.

The board is 46 mm diameter ‘SRK’ format. It needs a brass contact ring for the cells+ contact, isolated from the board in the top quadrant. This is an unfortunate necessity due to the power-bank chip’s thermal requirements.

USB ports should be through-hole type for the sake of durability. Not so easy if we want to keep the 46 mm SRK format board. So at the moment they will be on a separate board, together with the diagnostic LED for power bank functionality. The bunch of small wire pads for USB interfacing may eventually get reworked to a small connector.

U3 is a precision DC opamp and does the closed-loop current control for the LED driver (driving a meaty FET in linear mode). A sense resistor creates the feedback signal. The MCU (a venerable tiny85) generates the reference signal. Driver dropout should be < 150 mV, giving regulated control down to about 3.2 V.

U4 is an all-in-one power-bank chip from TI’s BQ24 or BQ25 series (currently looking at the BQ25895, it is also used in the higher end Xiaomi power banks).

MtnDon
MtnDon's picture
Online
Last seen: 5 min 49 sec ago
Joined: 08/27/2015 - 18:25
Posts: 2083
Location: Expatriate Canadian in New Mexico, USA

Add a second for me, thanks

The Miller
The Miller's picture
Offline
Last seen: 7 months 1 week ago
Joined: 12/14/2015 - 12:08
Posts: 9631
Location: Charente France

Nice DEL!
Makes me dizzy to just see the board, and you designed it and actually know why it all is as it is…

The Miller
The Miller's picture
Offline
Last seen: 7 months 1 week ago
Joined: 12/14/2015 - 12:08
Posts: 9631
Location: Charente France

Ah and with this design, of a brass ring is soldered on it will be isolated from north?

djozz
djozz's picture
Online
Last seen: 6 min 22 sec ago
Joined: 09/07/2012 - 17:04
Posts: 13574
Location: Amsterdam

That sounds and looks like an über- Cool driver DEL, so PWM-less smooth dimming plus charger plus powerbank! Love

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

DBSAR
DBSAR's picture
Offline
Last seen: 11 hours 17 min ago
Joined: 02/11/2013 - 23:28
Posts: 5140
Location: Ontario, Canada

DEL wrote:
Driver progress! We are still in design stage, so a few things will probably change before it is all said and done. But I am close to ordering boards and parts for a prototype.

Basic specifications for the stock setup:

  • Constant current drive to LED (no PWM), 0 to 1 A (can be bumped up to about 2 A with a resistor change)
  • Output can be adjusted in firmware with 4 mA resolution (255 steps over the 1 A range)
  • Firmware is TK’s domain and will probably be a flavor of Anduril
  • 2 A charging via a micro USB port. Cells over-voltage protection. Proper charging profile with 128 mA pre-charge, 256 mA charge termination. 4.208 V termination voltage with 0.5% accuracy.
  • Power-bank functionality: 2.1 A output for a phone or tablet via a standard USB port
  • 90%+ efficiency for charging and power-bank output buck/boost circuits.

The board is 46 mm diameter ‘SRK’ format. It needs a brass contact ring for the cells+ contact, isolated from the board in the top quadrant. This is an unfortunate necessity due to the power-bank chip’s thermal requirements.

USB ports should be through-hole type for the sake of durability. Not so easy if we want to keep the 46 mm SRK format board. So at the moment they will be on a separate board, together with the diagnostic LED for power bank functionality. The bunch of small wire pads for USB interfacing may eventually get reworked to a small connector.

U3 is a precision DC opamp and does the closed-loop current control for the LED driver (driving a meaty FET in linear mode). A sense resistor creates the feedback signal. The MCU (a venerable tiny85) generates the reference signal. Driver dropout should be < 150 mV, giving regulated control down to about 3.2 V.

U4 is an all-in-one power-bank chip from TI’s BQ24 or BQ25 series (currently looking at the BQ25895, it is also used in the higher end Xiaomi power banks).

Beautiful work DEL! I will update the OP with your work on the driver for the lantern. Smile

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DavidEF
DavidEF's picture
Offline
Last seen: 8 hours 37 min ago
Joined: 06/05/2014 - 06:00
Posts: 6330
Location: Salisbury, North Carolina, USA

The Miller wrote:
Ah and with this design, of a brass ring is soldered on it will be isolated from north?

If so, those vias from the gnd plane of U4 should be masked, right?

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

DavidEF
DavidEF's picture
Offline
Last seen: 8 hours 37 min ago
Joined: 06/05/2014 - 06:00
Posts: 6330
Location: Salisbury, North Carolina, USA

I know it would be bunches more expensive to do, but if a 4-layer board were possible, all the ground planes and thermals could be re-routed away from the ‘center’ ring in the middle layers, leaving us with a ‘standard’ back layer with ‘standard’ v+ and v- rings.

Edit: OSH Park doesn’t support ‘blind’ vias, so that would make re-routing tricky, even with 4-layer boards. But, if we could get it done, I think it would be worth it, even if the cost goes up a bit.

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

DEL
DEL's picture
Offline
Last seen: 8 months 3 weeks ago
Joined: 06/28/2015 - 08:35
Posts: 559
Location: Canada
DavidEF wrote:
The Miller wrote:
Ah and with this design, of a brass ring is soldered on it will be isolated from north?
If so, those vias from the gnd plane of U4 should be masked, right?

Those are thermal vias, not supposed to be masked. Not sure I would trust just masking either. A short there would be spectacular. The ring would need to be relieved on the back so that it ‘hovers’ in that area. The area should also be sealed up so that a metal shaving or similar cannot get in. Would have been much simpler without the power-bank stuff Smile .

We will have to see what the manufacturer can work with, ditto for the off-board USB ports.

DavidEF
DavidEF's picture
Offline
Last seen: 8 hours 37 min ago
Joined: 06/05/2014 - 06:00
Posts: 6330
Location: Salisbury, North Carolina, USA
DEL wrote:
DavidEF wrote:
The Miller wrote:
Ah and with this design, of a brass ring is soldered on it will be isolated from north?
If so, those vias from the gnd plane of U4 should be masked, right?

Those are thermal vias, not supposed to be masked. Not sure I would trust just masking either. A short there would be spectacular. The ring would need to be relieved on the back so that it ‘hovers’ in that area. The area should also be sealed up so that a metal shaving or similar cannot get in. Would have been much simpler without the power-bank stuff Smile .

We will have to see what the manufacturer can work with, ditto for the off-board USB ports.


Well, I’m not sure I would trust ‘just’ masking either, but I’d trust it a lot more than ‘not’ masking! If we could get a 4-layer board with blind vias through three layers, but not through the back layer, to spread the heat side-ways to a less dangerous place, that would make me feel better. Big Smile

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

DavidEF
DavidEF's picture
Offline
Last seen: 8 hours 37 min ago
Joined: 06/05/2014 - 06:00
Posts: 6330
Location: Salisbury, North Carolina, USA

What about moving the U4 to be within the inner circle? You’d still have to make a gap in the v+ ring to let the thermal plane thru, but it could be masked and safely bridged across with the brass ring. Is that possible or am I dreaming?

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

sgt253
Offline
Last seen: 6 days 13 hours ago
Joined: 11/27/2015 - 21:21
Posts: 41
Location: USA

Please add me to the list for one. Looks really good to me!

Wieselflinkpro
Offline
Last seen: 5 hours 44 min ago
Joined: 05/21/2015 - 04:34
Posts: 732
Location: Germany - TLF

Will the main LED-Driver be a buck-driver for maximum efficiency?

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 25 min ago
Joined: 01/12/2013 - 14:40
Posts: 8105
Location: (469219) 2016 HO3

I noticed I’m not on the interest list… but I’m doing the firmware so I should probably be on the list. Miller? Wink

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 25 min ago
Joined: 01/12/2013 - 14:40
Posts: 8105
Location: (469219) 2016 HO3
Wieselflinkpro wrote:
Will the main LED-Driver be a buck-driver for maximum efficiency?

It’s a linear FET, not a buck driver. Runtimes should still be very long though.

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 25 min ago
Joined: 01/12/2013 - 14:40
Posts: 8105
Location: (469219) 2016 HO3

DavidEF wrote:
If possible, it would be great to have a modern firmware, like Narsil, or Anduril, if it’s ready in time. I know most people will probably want the UI to be simple. So the default should be set to a simple mode group. But, for the rest of us, it will be nice knowing we can change to something more interesting. Especially for those of us who are still not flashing our own yet. Blushing

I for one, am REALLY wanting the lightening mode with this lantern!

It’ll mostly depend on what DBSAR wants, but for now I’m planning on porting Anduril to it and adjusting the default settings. So you’ll most likely get lightning storm mode, and candle flicker mode, and maybe other stuff. If it has a switch LED it’ll be possible to set the switch LED to high/low/off when the main emitter is off.

This also means you can have a mode group or ramping, and the mode group can be whatever you want… as long as you want 2 or more evenly-spaced levels in sorted order. Want 3 steps? Use 3 steps. Want 18 steps? Use 18 steps. Don’t like moon? Raise the floor. Etc.

Thermal regulation likely won’t even be relevant, so it’s not waiting on me to tweak that for better behavior. Mostly, I’m just waiting for hardware so I can add support for it. It’ll have to use a pin for voltage measurement like on older BLF drivers, and the power control is a little different, and it’ll need ramp adjustments and stuff. But that shouldn’t be hard.

Pages