English
Dimmable power sources, such as the LPF series produced by Mean Well, can also be used for dimming and powering LED strips (12 V or 24 V rated voltage) and dimming LEDs powered by nominal current (LED current strips, LED chips).
These resources are controlled by analogue signal 0 ÷ 10 V, and either any analogue Foxtrot system output can be used, or a specialized module C-DM-0002L-10V, which is equipped with programmable control in time (ramp), similarly to other C-DM series modules.
Fig. 1. An example of using the C-DM-0002L-10V module to control the LPF sources
Notes:
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The text below gives you basic information concerning dimming of the LPF series sources and the LED strips used.
LPF-40D-24
Dimmable switched power supply designated primarily for powering LED sources both with nominal voltage (standard LED strips) and with rated current (power LED chips and modules),
controllable constant current within the output voltage range from 14.4 ÷ 24 VDC
Inrush current after switching (cold start) is max. 50 A for max. 210 μs.
If the setting of characteristics in the C-DM module is linear, then from 10% up the value of the required brightness corresponds to the value of the output current:
|
The required value |
10 % |
20 % |
30 % |
40 % |
50 % |
60 % |
70 % |
80 % |
90 % |
100 % |
|
Output current |
10 % |
20 % |
30 % |
40 % |
50 % |
60 % |
70 % |
80 % |
90 % |
100 % |
Below the 10% value the output level is zero, i.e. the light source is switched off.
LPF-60D-12
Dimmable switched power supply designated primarily for powering LED sources both with nominal voltage (standard LED strips) and with rated current (power LED chips and modules),
controllable constant current within the output voltage range from 7.2 ÷ 12 VDC
Inrush current after switching (cold start) is max. 55 A for max. 270 μs.
If the setting of characteristics in the C-DM module is linear, then from 10% up the value of the required brightness corresponds to the value of the output current:
|
The required value |
10 % |
20 % |
30 % |
40 % |
50 % |
60 % |
70 % |
80 % |
90 % |
100 % |
|
Output current |
10 % |
20 % |
30 % |
40 % |
50 % |
60 % |
70 % |
80 % |
90 % |
100 % |
Below the 10 % value the output level is zero, i.e. the light source is switched off.
Led strip 98/W CURRENT CREE, an example of use:
CRI > 80
the length of the strip 1,143mm (it must correspond to the maximum supply current)
luminous flux 3,900 lm
power input of the LED strip 33 W
maximum current in the given connection 1.67 A (using the LPF-40D-24 source)
This strip is one of the types that are designed to be supplied from a power source.They do not have resistors in series at LEDs, so they reach the highest efficiency from these sources. They cannot be connected in parallel in various lengths like standard voltage tapes; their length is limited by the maximum current - the design of a particular strip, and it must be addressed in the design stage (the strip cannot be shortened as needed).
These strips are supplied from sources of constant current, or from a source of voltage that can be operated in the "constant current" mode - e.g. the sources used in this example.
Led strip 90/W 6300 CREE
CRI > 80
luminous flux 6300 lm
power input of the LED strip 79 W
length of the strip 1,056 mm
maximum current in the given connection x A (using the LPF-60D-12 source)
The strip used in the example is one of very powerful voltage LED strips. It is controlled by the voltage source as a standard.