Meanwell LDD driver: for those who want to dim to 0 using Arduino

Thanks O2,...if you have more than you want/need, yeah, I have 55 on order with DigiKey Send me your paypal, and I'll send some $. You have my email. The DK's appear to be about 3 weeks out, and I can wait, do big deal.

Just got a pair of Engineer PA-20 crimping tool, and a PS-03 needle nose that came in the mail today,...straight from the country of the rising sun, to add with new little Plato 170's and my GB 16 to 30 wire strippers. Kind of reminds me of my first erector set. :lmao:
 
Hey everyone-

I know that I posted about this a few pages back, but I recently got around to ordering a batch of these little SCW/LDD-H adapter PcB's and they arrived in yesterday's mail. I spent a few minutes last night to solder one up and try it out. It works! This little adapter allows the installation of an SCW convertor into a position normally occupied by an LDD-H. This converts the Led outputs for that channel into a switched 12V source for cooling fans or whatever. The little PcB carries it's own power indicator led, a flyback diode, a couple of resistors, and a 600ma NPN transistor that is controlled by the main PcB's PWM input pin.
I tested the circuit with a normal run-of-the-mill 2 wire PC cooling fan. I could turn the fan "on" and "off" or control the speed of the fan using a PWM signal from my led controller. I was able to slow the fan to around 20% duty cycle with no problem. This little adapter could prove handy for people using some of the older PcB designs found earlier in this thread.

Here's a photo of the circuit, the SCW pins are offset from the LDD-H pins by about 2mm, so the adapter should fit most of the older boards.

SCW_to_LDD-H_2wire_Fan_Control_Adapter_zpscf60ff5f.png


I'll take some pictures of the adapter PcB with the SCW installed on an actual LDD-H PCB later, and post them tonight.
 
O2Surplus said:
Hey everyone-

I know that I posted about this a few pages back, but I recently got around to ordering a batch of these little SCW/LDD-H adapter PcB's and they arrived in yesterday's mail. I spent a few minutes last night to solder one up and try it out. It works! This little adapter allows the installation of an SCW convertor into a position normally occupied by an LDD-H. This converts the Led outputs for that channel into a switched 12V source for cooling fans or whatever. The little PcB carries it's own power indicator led, a flyback diode, a couple of resistors, and a 600ma NPN transistor that is controlled by the main PcB's PWM input pin.
I tested the circuit with a normal run-of-the-mill 2 wire PC cooling fan. I could turn the fan "on" and "off" or control the speed of the fan using a PWM signal from my led controller. I was able to slow the fan to around 20% duty cycle with no problem. This little adapter could prove handy for people using some of the older PcB designs found earlier in this thread.

Here's a photo of the circuit, the SCW pins are offset from the LDD-H pins by about 2mm, so the adapter should fit most of the older boards.

SCW_to_LDD-H_2wire_Fan_Control_Adapter_zpscf60ff5f.png


I'll take some pictures of the adapter PcB with the SCW installed on an actual LDD-H PCB later, and post them tonight.
Click to expand...

Is this the same circuit that is on the 4upLDD/SCW boards that you had made a while back (I got four of them from you)?
 
jedimasterben said:
Ok, so the ones I got will only do PWM fans. Poop.
Click to expand...

Oh No- you can PWM any fan that you want with that 8up board. All you have to do is- Connect your PWM signal to the middle pin on the 3 pin fan control header. The middle pin is normally used as an "on/off" signal for 4 wire fans, but it can also be used as a PWM input for 2 & 3 wire fans.:beer:


I posted a picture of the board connections and a wiring diagram for the fan circuit a page or two back LOL
 
That's brilliant! So using those interface boards and an appropriate SCW for your input voltage, you can have PWM over any 12V fan, including normal 2 pins ones? Fantastic:)

I'm looking at getting some of joshlawless's 6up boards ordered. Ideally I want 7 LED channels, but might get away with 6. But I also want fan control (and, I think I need 50mm fans due to space in the hood, which you can't get PWM over here in the UK). One of the 8up boards would be good, except I only have a space of 90mm x 200mm :(

I could use 2 of the 6up boards and that way have the 7 channels I want, use a SCW and even have some spare slots :)

Tim
 
perkint said:
That's brilliant! So using those interface boards and an appropriate SCW for your input voltage, you can have PWM over any 12V fan, including normal 2 pins ones? Fantastic:)

I'm looking at getting some of joshlawless's 6up boards ordered. Ideally I want 7 LED channels, but might get away with 6. But I also want fan control (and, I think I need 50mm fans due to space in the hood, which you can't get PWM over here in the UK). One of the 8up boards would be good, except I only have a space of 90mm x 200mm :(

I could use 2 of the 6up boards and that way have the 7 channels I want, use a SCW and even have some spare slots :)

Tim
Click to expand...


Tim-

Yes...even the two wire fans LOL. But more importantly ANY fan. All fans use at minimum, 2 wires (power & ground)so any additional wires are just "fluff" as far as this control scheme is concerned.
:beer:
 
So the SWC is just a voltage regulator and your circuit uses the PWM signal to control the input to the SWC (ie when run at 50% PWM your circuit handles the PWM control and only gives the SWC power for the 50% duty cycle)?

Sorry if this has aleady been explained. I have read the posts, but if clarification was there, it obviously wasn't quite simple enough for me :o

Tim
 
perkint said:
So the SWC is just a voltage regulator and your circuit uses the PWM signal to control the input to the SWC (ie when run at 50% PWM your circuit handles the PWM control and only gives the SWC power for the 50% duty cycle)?

Sorry if this has aleady been explained. I have read the posts, but if clarification was there, it obviously wasn't quite simple enough for me :o

Tim
Click to expand...

Tim-

The PWM signal only affects the transistor tied to the output minus leg of the SCW. The positive side ( Led + out) remains hot at all times. Only the ground side of the circuit is switched "on/off". A straight 5V turns it "on", a low or absent voltage turns it off. Remember- a PWM signal is nothing more than series of "on/off pulses" with a varying ratio of "on" vs. "off" time. The transistor reacts to the PWM signal by varying "on" time that the fan circuit can reach ground. Thus the fan turns at full speed with a high PWM duty cycle or slower with a lower PWM duty cycle. Think of it this way- instead of using PWM to dim an led, were using it to "dim" the fan. LOL
 
O2Surplus said:
Tim-

The PWM signal only affects the transistor tied to the output minus leg of the SCW. The positive side ( Led + out) remains hot at all times. Only the ground side of the circuit is switched "on/off". A straight 5V turns it "on", a low or absent voltage turns it off. Remember- a PWM signal is nothing more than series of "on/off pulses" with a varying ratio of "on" vs. "off" time. The transistor reacts to the PWM signal by varying "on" time that the fan circuit can reach ground. Thus the fan turns at full speed with a high PWM duty cycle or slower with a lower PWM duty cycle. Think of it this way- instead of using PWM to dim an led, were using it to "dim" the fan. LOL
Click to expand...

This way to act could be used with other régulator than SCW (some LM2576 for exemple)?

Marc
 
Idefixes said:
This way to act could be used with other régulator than SCW (some LM2576 for exemple)?

Marc
Click to expand...

Sure- another regulator could be used to do the same thing, just use the same basic circuit. I wanted this to be an "Off the shelf" "PlugNPlay" solution. The Meanwell SCW05C-12 can handle up to 72V on it's input side. That exceeds the 56V maximum voltage of the LDD-H. It's almost like-"they were made for each other":love2: LOL
 
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