Wanting to design a cree led powered dock rechargeable torch running on 18650 cells Answered
Hi all, I had an idea the other day that it would be very useful to have a powerful torch in my van that is kept charging in a dock all the time (as required at least) when the engine is running.
I know I can get similar torches that charge via a USB cable, and that I could plug the cable into a cigarette lighter socket etc, but what I would like to do is as follows:
- Power from a 12v (ignition switched) source in vehicle, to a charging dock.
- Torch must be powered by 18650 lithium-ion cells (2 ideally).
- Torch would run a cree (or cree style) powerful LED chip/diode (maybe up to 10w arbitrary power).
- Torch does not need to have a wire plugged into it, but can be simply placed into the dock after use in order to resume charging. The connector for charging is not important but likely a jackplug type arrangement, or else spring terminals.
- Housing will be 3D printed, and using a lens from an existing torch (probably).
So mostly I'm happy about making and designing this, except that I'm not certain about what setup (either the circuit design if bespoke or what off the shelf module etc) I should use for taking 12v to charge 2x 18650 cells in situ.
I have got small USB charging modules already, and I have things like voltage boosters/reducers, and tons of electronic components, but the USB charge module is no use for using with a 12v supply etc, so I'm not sure how to best address this part of the project.
If anyone has suggestions on good ways to accomplish this I'd be really grateful, thanks!