220v DC Led indicator circuit diagram

Hi,

I am looking for a 220v DC Led indicator circuit diagram which can be connected to a 220v DC battery supply used in a power generationg station. When I searched in google I could only found 220v AC circuits...so please help...


Regards
Sajeev

Hi,
The simplest configuration should work:


Calculate R1 as:
(Vin - Vled)/Iled
=(220-Vled)/Iled
Vled is the LED forward voltage dependent on the colour of the LED: ~1.4v for red, ~2.3v for green, etc.
Iled is the LED current, dependent on the LED. For a standard LED, you can select 10-15mA.

So, if it's a red LED with Iled = 10mA
R=(220-1.4)/0.01
=21.8k
Select 22k

Hope this helps.
Tahmid.

---------- Post added at 23:00 ---------- Previous post was at 22:59 ----------

Be careful about the resistor rating. In the above example, power dissipated within resistor = (220-1.4)*0.1 = more than 2W. So select something appropriate. You could reduce Iled to reduce power dissipation.

Hope this helps.
Tahmid.

---------- Post added at 23:04 ---------- Previous post was at 23:00 ----------

At such high voltage, however, I use low Iled and use a 100k resistor. However, this works because the LED's current demand is low. Check if your LED can work with a few mA's current. If so, it helps reduce the power rating of the resistor.

Hope this helps.
Tahmid.

If you don't want to build your own, you can get off-the-shelf product from LEDtronics | LED, LED Lights, LED Light Bulbs, LED Lamps, LED Indicators, Super Bright LEDs.

hi i think this calculation is best for you

sajeev said:

Hi, I am looking for a 220v DC Led indicator circuit diagram which can be connected to a 220v DC battery supply used in a power generationg station. When I searched in google I could only found 220v AC circuits...so please help...Regards Sajeev

Click to expand...

Could you please clarify which power stations generate DC of 220 volts and why? If you get Dc, it should have been converted from a AC source. Any ways, if you have got Indicator circuits which work on AC, those should work well on DC too.
Cheers

Beware of reverse voltage that supports the LED, it is advisable to place a diode in parallel with the LED

If it is AC and not DC as stated, put the diode in SERIES with the LED. Putting it in parallel does the same job but doubles the power dissipation in the series resistor!

Brian.

resister will pose problem of heatng .will some body suggest solution for this

I have always seen One 1N4007 and 15K 2watt x 4 No's in series to connect a 5mm red LED directly to a 220volts source. It works fine since years as it is connected as an indicator to a Reputed brand of Voltage stabilizer output. This was the case for AC volatge. I guess the same should work and DC too.
Cheers