LED dimmer

[FAQ-Forum-Bot]

Hello,I have got a custom setup made of "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" plugged to a LPC-35-700 plugged itself to the sector.I want to modulate the LED light intensity. Does the following product "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" can be driven by a LED dimmer ?If I buy a 220V LED dimmer, can I connect it between the sector and the LPC-35-70 ?If I buy a 48V LED dimmer, Can I connect it between the LPC-35-700 and the PowerBar LED Strip ?What do you advise to me ? Do the two constructs are equivalent?Thanks a lotBest

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Diese Frage von LE D. bezieht sich auf PowerBar LED Strip, 12 Nichia LEDs, CRI 90+ und wurde durch den FAQ-Bot automatisch eingestellt.

[Borax]

The LPC-35-700 is not dimmable. You will need another driver. Which one is suitable depends on how you want to dim: By an 230V AC dimmer, PWM dimmer, 1-10V control voltage...

[Juan]

Thank you Borax.
So , if the LPC-35-700 is not dimmable I suppose it is possible to connect a dimmer between the LPC-35-700 and the "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" ?
To precise, I would like to build a circuit of 10 units of "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" in parallel that will be supplied by a single LPC-35-700.
My requests are : to dimm the LED from 0 to 48V (change light intensity) and to modulate the light frequency.
So, what kind of LED dimmer (0-48V PWM dimmer if it exists?) do you advise to me ?
Thanks a lot
Best

[Borax]

Hi Juan, welcome on board!

I suppose it is possible to connect a dimmer between the LPC-35-700 and the "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" ?

No. This will not work. As mentioned the LPC-35-700 in not dimmabe.

To precise, I would like to build a circuit of 10 units of "PowerBar LED Strip, 12 Nichia LEDs, CRI 90+" in parallel that will be supplied by a single LPC-35-700.

Then each units of "PowerBar LED Strip" will only get about 70mA... That doesn't make sense... If only this small amount of brightness is necessary, you can use a cheaper LED Stripe. If you need the brightness of the Powerbars, you will need a driver for each Powerbar (or use other drivers which can at least supply two of the Powerbars in series).

[Juan]

I understand that the LPC-35-700 is not dimmable but, it is only avalaible when you connect the dimmer before the LPC ? When you connect the dimmer after the LPC it will work theorically, wrong ?
You're right, I will obtain only 70 mA in each units that is too small.
Indeed, as i want 10 of these powerbar LED strip in parallel that require 700 mA each, I need a generator (or AC/DC converter) that generates 48V and 7A. Does it exist ?

[Borax]

When you connect the dimmer after the LPC it will work theorically, wrong ?

Theoretically yes, practically no. If the LEDs are disconnected from the KSQ (which is exactly what a PWM Dimmer does for a short time), the KSQ will rise the voltage to their max. possible output voltage. When the PWM Dimmer reconnects the LEDs to the KSQ the LEDs get this high voltage and may well be damaged. Even if the LEDs survive, the stress for the KSQ is very high and I think it would fail pretty soon.

I need a generator (or AC/DC converter) that generates 48V and 7A. Does it exist ?

Yes (example: http://www.reichelt.de/SNT-HRP-300-48/3 ... CLE=108273 ) But you will need 10 low voltage KSQs as well. For example these: http://www.pollin.de/shop/dt/OTM3ODQ2OT ... 50_mA.html You can use one PWM dimmer for these 10 KSQs (all 10 dimm inputs can be used in parallel. See the datasheet: http://www.pollin.de/shop/downloads/D351260D.PDF )
BTW: 700mA is the absolut maximum which the Powerbars can stand with optimal cooling. Using 10 of them would mean to cool about 280W...
I would use a lower current.