eepty
Full Member level 2
I am designing a circuit to drive a high power LED system. The system has to drive max. 7 LED strips, each strip has 20 LEDs, each LED is about 3W (forward voltage 3V, 1A). As such, I have drafted two solutions.
For the first solution, please see the attached picture (solution-1.png). I have designed to include a simple constant current source circuit on each LED strip, such as a LM317, to provide the 1A current for each strip. For the power supply, I want to use a AC/DC switching power supply to provide at least 450W, 75V output.
I would like to ask is this system feasible? One of my concern is that can I find an off-the-shelf AC/DC switching power supply to output ~75V, 450W? If not, what is your suggestion?
Another question is if this is feasible, is the LM317 good to be a constant current source in this circuit?
For the second solution, please see attached picture (solution-2.png). In this solution, each LED strip is connected with a off-the-shelf AC/DC constant current source. Therefore 7 strip will need 7 source. This will be rather bulky.
Also, is this system feasible? To switch on/off the LEDs by a micro-controller, I will need to use a solid-state-relay to switch the AC power of the strip, I am not sure if this will has any problem because the load (the constant-current-supply and the LED strips) is not a linear load. (I am not switching a PWM signal, I only need to switch a very low speed on and off sequence).
In your opinion, which solution is better? What is their pros and cons?
Thank you very much for your help!
For the first solution, please see the attached picture (solution-1.png). I have designed to include a simple constant current source circuit on each LED strip, such as a LM317, to provide the 1A current for each strip. For the power supply, I want to use a AC/DC switching power supply to provide at least 450W, 75V output.
I would like to ask is this system feasible? One of my concern is that can I find an off-the-shelf AC/DC switching power supply to output ~75V, 450W? If not, what is your suggestion?
Another question is if this is feasible, is the LM317 good to be a constant current source in this circuit?
For the second solution, please see attached picture (solution-2.png). In this solution, each LED strip is connected with a off-the-shelf AC/DC constant current source. Therefore 7 strip will need 7 source. This will be rather bulky.
Also, is this system feasible? To switch on/off the LEDs by a micro-controller, I will need to use a solid-state-relay to switch the AC power of the strip, I am not sure if this will has any problem because the load (the constant-current-supply and the LED strips) is not a linear load. (I am not switching a PWM signal, I only need to switch a very low speed on and off sequence).
In your opinion, which solution is better? What is their pros and cons?
Thank you very much for your help!