Lighting HLG B series PWM dimming question.

[growbot]

Does anyone use PWM on Meanwells here ? I have a PWM module but am having issues and info online is almost non existent. I bought this and a 10 v ac to dc adapter:

Amazon product ASIN B07W229NVP
The unit seems to work and power on but I can't get dimming to work. What is the frequency you set and do I need to shunt a resistor or something ?

If anyone knows and can share, thank you !

 

[wwwillie]

Does anyone use PWM on Meanwells here ? I have a PWM module but am having issues and info online is almost non existent. I bought this and a 10 v ac to dc adapter:

Amazon product ASIN B07W229NVP
The unit seems to work and power on but I can't get dimming to work. What is the frequency you set and do I need to shunt a resistor or something ?

If anyone knows and can share, thank you !

What model of Meanwell HLG-xxx-xx-B?
Have you checked the data sheet? I’ll go dig one up and see what it says. Not that I know mind you. I’m in the middle of working an arduino for this with ldd series and HLG b series as well.

 

[wwwillie]

Okay. I’ll use this to drop info for us.
Here’s a good discussion of frequency for PWM dimming. That should help choosing that parameter.

Don’t Want to Hear It? Avoid the Audio Band with PWM LED Dimming at Frequencies Above 20kHz | Analog Devices

IntroductionThe requirements of LED drivers become more demanding as application designers exploit the unique characteristics of LEDs. Linear Technology offers a complete portfolio of LED drivers with the performance levels required to meet even the most challenging design requirements. One area...

www.analog.com

 

[growbot]

What model of Meanwell HLG-xxx-xx-B?
Have you checked the data sheet? I’ll go dig one up and see what it says. Not that I know mind you. I’m in the middle of working an arduino for this with ldd series and HLG b series as well.

HLG 320H C1400B

‘What I can find indicates ad additive PWM signal with a freq. of 100hz to 3 kHz. The rest is the usual standard duty cycle stuff. My signal generator’s instructions make it seem like a simple plug in job, the only mention of a resistor is to run a load directly from the signal generator as far as I can see. Could be it just doesn’t work. No oscilloscope unfortunately.

 

[wwwillie]

HLG 320H C1400B

‘What I can find indicates ad additive PWM signal with a freq. of 100hz to 3 kHz. The rest is the usual standard duty cycle stuff. My signal generator’s instructions make it seem like a simple plug in job, the only mention of a resistor is to run a load directly from the signal generator as far as I can see. Could be it just doesn’t work. No oscilloscope unfortunately.

I hear you. It’s new to me too. I’ll look into it more.

 

[wwwillie]

Hey,
So I finally had time to look this over. I looked at the widget on Amazon and read the manual if you could call it that. Which leads me to the question, just what are you trying to do with this thing? I cannot figure out how you would put it to use. It says it will drive an LED but Meanwell states it doesn’t want an additional driver added to it. If you just want to dim, a cheap 100k ohm pot will do the trick. Just leave the dimming wires un connected for full power. The widget doesn’t add anything, there’s no interface. . .
Let me know. I’m curious.

 

[growbot]

Well if you don’t want to use a trim pot you’re supposed to be able to use a signal between 100 Hz and three kill hurt and very the duty cycle in order to dim the meanwhile driver digitally. I already have a nice pot on there but I wanted something more exact, I wanted to be able to measure the settings in a certain percentage and figure out the rough PPFD. From then I just be able to set the approximate power level and verify it. Plus I just thought it would look cool if the light was dimmed that way.

The other wat to dim besides a trim potentiometer and PWM is to put between zero and 10 and 1 to 10 V on those wires.

 

[wwwillie]

Ah. . . Got it. I think. Want to find a setting or settings that you could repeatedly use. OK there has to be a way then. Maybe not with that widget but it should work.