This E-scooter or E-bike was sent for our exploration by Jan in Germany.
It's very unusual due to its huge 5V to 58V operating range, and is also not polarity sensitive.
The light itself is really just a low power static red LED, but the two stage circuitry used to drive it efficiently from such a high voltage is quite interesting.
Here's a link to the manufacturers website. They seem to have a huge range of lights and reflectors.
https://www.satelitebikelight.com/products/
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.
It's very unusual due to its huge 5V to 58V operating range, and is also not polarity sensitive.
The light itself is really just a low power static red LED, but the two stage circuitry used to drive it efficiently from such a high voltage is quite interesting.
Here's a link to the manufacturers website. They seem to have a huge range of lights and reflectors.
https://www.satelitebikelight.com/products/
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.
I am swiping that current regulator circuit to use driving LEDs…
The Egret TenV4's rear light has a similar design and surprisingly, the component that breaks first is the inductor! Probably, due to shock an vibration the coil's ferrite core breaks off and the cooper wire then unwinds itself inside the light's enclosure. There have been some people who were facing this problem after only 1-2month driving the scooter.
Just noticed the obscene 15 second Ads at the beginning and end of the videos, and corresponding change in the wording of his donation plug at the bottom of every video. Shame, the videos are a lot less enjoyable…
thats kinda complex for a simple LED
I would think the 58v rating would be so that the light is fully compatible with all common e-bike/scooter batteries as most are between 24 and 52v nominal. Would be interesting to strap it to a 72v battery and see if it can handle it.
The upper limit voltage is 58v because that is the usual maximal scooter/high power ebike battery configuration, 14s li-ion/lipo and most are on the 13s battery configuration.
Call me lazy but for 50v, I would of used 2 generic bright Red 30ma LEDs and a 2W 2k resistor to drive them at 23ma each. They will last a hell of alot longer while being cheaper.
33nF in the schematic feeds ripple component back to the Vfb pin to limit spiking in the output. It causes the chip to go onto cutoff when there's a strong positive swinging change in the output. As a result it also causes it to act something like a soft start, limiting inrush.
Not to be too picky, but there's more power lost in the transistor and sense resistor, than the led. I wonder if instead of 4.4v, 3.3v would be a better choice, or what problems come up when that was tried. Maybe they used 4.43v to allow them to use different leds, that might drop more voltage?
its rate 58V because scooters usually get powered by lithium batteries, whose voltage is given as their nominal voltage not maximum. So for the average "scooter" driver connecting a 58v battery, it can have up to 75V fully charged.
I guess this one wasn't from AliExpress
I've been wondering for a while how do you print the photos out that you show?
he knows german, damn
quiet good for a country which left the eu
sorry, that is a bad joke, you can delete it
Did anyone else notice what appears to be the manufacturing date on the board? Am I reading it wrong? 2019-06-31? June 31โst?
That cap on the voltage sense line, I'd like to investigate that more. If it were between the sense line and ground, it would smooth the sensed value (relative to the 0V rail). But where it is, it seems it would pass through the 'pulses' each time the inductor is turned on??? Is this something to improve the switching on/off of the inductor? Might cause some hysteresis? As the voltage dips and the chip calls to turn on the output, it 'sees' the spike sooner? Wish I could see a scope trace on that voltage sense line while operating. ๐ Oh well, maybe next time.