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premkumar9 · Dec 18, 2008

Ubergeek63 said:
You want a maximum power point charger. We had discussed this before, but I do not remember if you wanted them on all the time or how much power you needed.

The Charge Controller I use work in that principle.

premkumar9 · Dec 18, 2008

blueroomelectronics said:
Oh yea, the traffic light. LEDs don't need regulated power just current limiting.

My intention of using a regulated power is to limit the current. How is it possible to limit current with out regulating the supply voltage?

blueroomelectronics · Dec 18, 2008

For LEDs... Just a resistor to limit the current.

premkumar9 · Dec 18, 2008

blueroomelectronics said:
For LEDs... Just a resistor to limit the current.

Do you mean that after connecting a series resistor, we can apply any voltage?

blueroomelectronics · Dec 18, 2008

Yes. You need to read up on LED basics. Have you never worked with LEDs before?

premkumar9 · Dec 18, 2008

blueroomelectronics said:
Yes. You need to read up on LED basics. Have you never worked with LEDs before?

In that calculator
1. first you put 5V , Vf 2V and If 20 mA find R
2. Then give 200V,Vf 2V and use the same resistance value (because in my circuit resistance is fixed)
Tell what will happen to the LED.

blueroomelectronics · Dec 18, 2008

??? Do your LED traffic lights require 220V or 12V?

premkumar9 · Dec 18, 2008

blueroomelectronics said:
??? Do your LED traffic lights require 220V or 12V?

So you understood that the statement "after connecting a resistor we can apply any voltage " is wrong. So variation of the supply voltage from 11 to 15V will cause a current variation. That is not acceptable to me due to some reasons. I wanted to know a method to regulate my voltage. Of course a DC-DC converter may solve. But expected to hear an expert opinion in the forum. I know there are people in this forum who give good suggestions.

blueroomelectronics · Dec 18, 2008

It was a good suggestion. You could also wire up an LM317 as a current regulator instead of the resistor in series with the LED. For what reason is it not acceptable to you? Does your traffic light only have LEDs in it? are there other circuits? Relays? ICs?

premkumar9 · Dec 18, 2008

blueroomelectronics said:
It was a good suggestion. You could also wire up an LM317 as a current regulator instead of the resistor in series with the LED. For what reason is it not acceptable to you? Does your traffic light only have LEDs in it? are there other circuits? Relays? ICs?

It is by dropping the excess voltage and thus dissipating power. Is it not?

blueroomelectronics · Dec 18, 2008

OK are your traffic lights 220V or 12V?

audioguru · Dec 18, 2008

premkumar9 said:
How is it possible to limit current with out regulating the supply voltage?

A current regulator changes the voltage to maintain a certain current.

If the load is a high resistance then the output voltage of a current regulator goes high.
If the load resistance is low then the output voltage of a current regulator goes low.
If the output is shorted then the output voltage of a current regulator is zero but the regulated amount of current stays the same.

premkumar9 · Dec 18, 2008

blueroomelectronics said:
OK are your traffic lights 220V or 12V?

For this particular project it is 12V DC.

premkumar9 · Dec 18, 2008

I want the DC supply to be 11 to 12V DC. variation up to 15V is not acceptable. At the same time I want to avoid series dropping and power waste. Was trying to get a cheaper solution than a DC-DC converter.(the word "cheap" may give audioguru an opportunity for some more postings.)

Ubergeek63 · Dec 18, 2008

premkumar9 said:
So you understood that the statement "after connecting a resistor we can apply any voltage " is wrong. So variation of the supply voltage from 11 to 15V will cause a current variation. That is not acceptable to me due to some reasons. I wanted to know a method to regulate my voltage. Of course a DC-DC converter may solve. But expected to hear an expert opinion in the forum. I know there are people in this forum who give good suggestions.

HV9910 will run on 8-500V, though the inductor selection is not so forgiving.

Dan

premkumar9 · Dec 18, 2008

Curiosity

audioguru said:
A current regulator changes the voltage to maintain a certain current.

If the load is a high resistance then the output voltage of a current regulator goes high.
If the load resistance is low then the output voltage of a current regulator goes low.
If the output is shorted then the output voltage of a current regulator is zero but the regulated amount of current stays the same.

How did you choose the name "audioguru"? Guru is an Indian word. just because of my curiosity?

premkumar9 · Dec 18, 2008

Ubergeek63 said:
HV9910 will run on 8-500V, though the inductor selection is not so forgiving.

Dan

Thank you That gave me an idea. The same principle may be possible for my circuit were the FET is switched by Microcontroller.

audioguru · Dec 18, 2008

A salesman at work called me an Audioguru. I didn't know that a Guru was from India and I didn't know anybody from India.

Cheap? You mean cheep like the sound from a baby bird?
All electronic parts are inexpensive in Canada. Cheap parts come from China and India.

premkumar9 · Dec 18, 2008

audioguru said:
A salesman at work called me an Audioguru. I didn't know that a Guru was from India and I didn't know anybody from India.

I am sure that he is not an Indian. A person who knew the meaning would not have called you by that name. Probably he might have considerd it as an abusive word.

Cheap? You mean cheep like the sound from a baby bird?
All electronic parts are inexpensive in Canada. Cheap parts come from China and India.

What is the difference between 'inexpensive' and 'cheap'?

audioguru · Dec 18, 2008

Inexpensive is good quality and a low price.
Cheap is low quality and a low price.

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