Hello everybody!!!
I installed a pcb of leds on the dome like that:
http://img26.imageshack.us/my.php?image=4241836067osvetlenieintc.jpgbut i have a problem with this.
when i have the button (which opens the dome lights with the opening of door) pushed, and all of the doors are closed, the pcb of leds continue lighting but a little... but normally should be tottaly closed... The leds consume less current... can i do something to fix the problem?
Sorry for my english
Hi!
Usual lamp has approximately linear voltage-current characteristic.
And diode (led) has characteristic like this:
http://en.wikipedia.org/wiki/File:Diode-IV-Curve.svgIf you doesn't need led "soft start/stop" you may add serially connected resistor. (calculation: Resistor[Ohm]=(12/LedOpeningCurrent)-LedResistance) This will reduce current in the circuit.
If you need led soft start/stop: it is not so simple to make led behave like usual lamp. But there are some solutions:
You should use for example microcontroller which will generate impuses like that:
My solution: you have lo learn some special materials about leds.
One of them:
http://datasheets.maxim-ic.com/en/ds/MAX16832A-MAX16832C.pdfSorry for my english too
Regards, Anton.
