I don't undestand how this circuit works
I don't undestand how this circuit works
(OP)
Hi, I have got a solar lamp in my hands. Basically it's a photo-voltaic cell, with 1xNiCd 1.2V battery and a 3.3 white LED.
The circuit is some sort of controller that will on/off with light exposition to the CDS. It will also boost the 1.2V input Voltage to around 3.1 V. It seem to use some kind of switching into the Inductor, and the inductor maintains a steady current.
See illustration @
http://pages.infinit.net/f199/Circuit.JPG
But what I don't understand is that the manufacturer changed the inductor two 2x1 ohm in parrallel...and it still ligds a 3.3V LED How the Charge/Pump be possible without any inductor?
Here is the chip datasheet for who is interested.
http://pages.infinit.net/f199/6601D_english.pdf
Best regards
BeerBaron
The circuit is some sort of controller that will on/off with light exposition to the CDS. It will also boost the 1.2V input Voltage to around 3.1 V. It seem to use some kind of switching into the Inductor, and the inductor maintains a steady current.
See illustration @
http://pages.infinit.net/f199/Circuit.JPG
But what I don't understand is that the manufacturer changed the inductor two 2x1 ohm in parrallel...and it still ligds a 3.3V LED How the Charge/Pump be possible without any inductor?
Here is the chip datasheet for who is interested.
http://pages.infinit.net/f199/6601D_english.pdf
Best regards
BeerBaron





RE: I don't undestand how this circuit works
I don't understand ???
You can increase voltage without inductors by charging capacitors in parallel and then hooking them up in series but usually this is constrained to less than 50mA.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: I don't undestand how this circuit works
BeerBaron
RE: I don't undestand how this circuit works
WHAT IS A 2x1 ohm!?????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
?????????????????????????????????????????????
???!
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: I don't undestand how this circuit works
Are the resistors perhaps wire-wound, and have the right inductance to make the circuit work (but maybe are cheaper than purpose-built inductors).
RE: I don't undestand how this circuit works
RE: I don't undestand how this circuit works
Are you sure that they are resistors? Maybe they really are inductors that just happen to look like resistors to your eyes.
Do they have colour codes? If so, then maybe the colour code isn't a resistance value but is an inductance value or part number.
You could try measuring the resistance (carefully) and seeing if it matches the colour code - exactly. I'd keep the assumption that they're resistors only if the values matched within tolerance.
PS: It's a wee bit tricky to measure 1 ohms accurately; need a good meter and some understanding.
RE: I don't undestand how this circuit works
TTFN
Eng-Tips Policies FAQ731-376
RE: I don't undestand how this circuit works
http
http
http
Are they in parallel?
Perhaps 2 x 100uH?
RE: I don't undestand how this circuit works
Frederic Boucher
RE: I don't undestand how this circuit works