Inside a Nokero solar light (with schematic) скачать в хорошем качестве

Inside a Nokero solar light (with schematic)

This isn't a standard solar light. It's got very unique solar panels, and even more unique circuitry that makes it very different from ordinary solar lanterns. This light was sent by Steve at Nokero (No Kerosene) a few years ago, so hopefully the circuitry is still applicable. The Nokero website appears to be down now, so I'm not sure if they're still making these. The reason this light was designed is to provide safe illumination to parts of the world with no reliable electrical infrastructure. It uses good quality solar cells and a LiFePO4 battery that potentially offers around 2000 charge cycles with low loss of capacity over time. The most interesting parts of the circuitry are the current regulator, which took a lot of deducing to identify. The use of a Texas Instruments microcontroller that can monitor voltage accurately for circuit control, the unusual charge control technique of using the LED as a shunt load, and the very efficient use of a MOSFET as a very low drop alternative to the more common solar panel diode. The solar panel's transistor is only turned on when the panel's voltage exceeds the lithium cell voltage. It's effectively being used as a software controlled zero-loss diode (Active rectifier). That suggests that charge limiting is mainly based on the LED being used as a shunt load. The use of a LiFePO4 cell is notable, as it is safer and more rugged than the typical rechargeable lithium cells used in most phones and appliances. Although the technology has lower energy density than the classic 3.6/4.2V lithium cells, it offers greater capacity retention over its lifetime, and a much less volatile electrolyte. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.