 | NOTICE |
| Damage to the LED module | |
The operation of high power LEDs requires a thermal management for the LED module. Less cooling might result in damage to the LED module.
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The heatsink option depends on the total power input of the Corona II module. The usage of heatsinks is mandatory.
The total power input is affected by the following parameters:
Current in the control unit
Duty cycle of LED operation in pulse mode
The cooling power of a heatsink is affected by the following parameters:
Ambient temperature
Orientation of the Corona II module
orientation Corona II | orientation heatsink | cooling efficiency [%] | |
|---|---|---|---|
| horizontal | horizontal | 85 |
| horizontal | vertical | 90 |
| vertical | vertical | 100 |
The following heatsink options are available:
Small passive heatsink
Medium passive heatsink
Big passive heatsink
Water cooling (up to 2018)
Water cooling (from 2019)
Fan cooling
Thermal pad
To see the mechanical dimensions refer to mechanical dimensions of your Corona II module.
Suitable heatsink for your application
Calculation of the maximum operating temperature of the Corona II module
To choose a suitable heatsink the maximum module temperature of the Corona II housing has to be calculated:
TCORONA = TA + PCORONA · RTH · F1 · F2 · F3
TCORONA | Temperature of the Corona II housing at the hottest point | |
TA | Ambient temperature | |
PCORONA | Power input of one Corona II channel. It is assumed that a Corona II module with several channels is operated with a unique operating current IWORK for all channels. | |
RTH | Thermal resistance of the heatsink. Refer to ID7 Heatsinks. | |
F1 | Correction factor for mounting orientation of the heatsink | |
horizontal mounting | F1 = 1.00 | |
vertical mounting | F1 = 0.85 | |
F2 | Correction factor for module length | |
for 170 mm | F2 = 0.88 | |
for 340 mm | F2 = 0.92 | |
for 510 mm | F2 = 0.97 | |
for 680 mm | F2 = 1.00 | |
F3 | Correction factor for thermal coupling | |
for free mounting without additional heat flow over solid metal connections | F3 = 1.0 | |
mounting with additional heat flow connections; depends on heat flow conditions | F3 = 1.0 – 0.8 | |
Example
A Corona II module with length 340 mm and heat sink option B is operated at an ambient temperature of 25 °C. The module is mounted horizontally and has a good thermal contact to a large solid machine frame. The module is operated with a channel current of 0.9 A. The temperature is calculated as follows:
TCORONA = 25 °C + 34 W · 1.52 K/W · 1.00 · 0.92 · 0.85 = 65 °C
If the channel current is increased to 1.8 A the temperature is calculated as follows:
TCORONA = 25 °C + 74 W · 1.52 K/W · 1.00 · 0.92 · 0.85 = 82 °C
The maximum operating temperature of the Corona II module is 75 °C. The temperature at 1.8 A is too high. Use an additional air flow or a heat sink with a lower thermal resistence RTH to decrease the temperature.
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