6 Thermal Interface
6.1 Thermal interface model
Figure 6-1 illustrates the model for the thermal interface. The Socketable LLE is locked into position in the Holder and makes thermal contact with the heat sink of the Luminaire. The Socketable LLE generates an amount of heat, which is represented by the total thermal power Pth=Pth,rear+Pth,front. The Pth,front part of the heat is transferred to the environment of the Luminaire through the front side of the Socketable LLE by means of radiation and/or convection. The Pth,rear part of the heat is transferred to the environment of the Luminaire through the Thermal 最新宿舍管理制度Interface Surface.
Ta
Luminaire Heat Sink
Mains Power
Rth,rear
Thermal Interface Plane
Protective Earth
Tr Pth,rear
Holder
Pth,front
Socketable LLE
Rth,front
Figure 6-1: Thermal model
Light Emitting Surface
After switching on the Socketable LLE, the temperature of the Thermal Interface Surface
starts to ri. In the steady state—with the Socketable LLE switched on—the Thermal Interface Surface reaches a temperature Tr (see Section 6.2.1 for the location of the measurement point). This temperature Tr depends on the temperature Ta of the environment of the Luminaire, the thermal resistance of the Luminaire, and the amount of heat generated in the Socketable LLE. Using a simple 1-dimensional model, the following relation is obtained:
Tr=Ta+Rth,rear*Pth,rear
Here, Rth,rear is the thermal resistance, which the Luminaire presents to the Socketable LLE. Note that in general the temperature distribution across the Thermal Interface Surface is not uniform. See also Section
6.2.
This version 1.0- of Book 2 of the System Description Zhaga does neither define a maximum for the thermal resistance of the Luminaire, nor a maximum for the amount of h
eat generated in the Socketable LLE. Instead, this version 1.0- of Book 2 of the System Description Zhaga requires a Socketable LLE
manufacturer characterize the thermal performance—in terms of Pth and Pth,rear—of the Socketable LLE under the condition that the Socketable LLE is operated in Test Fixture TUTF-PHJ65d-x10,11, and provide the results on the data sheet of the Socketable LLE. See Annex B.1. Similarly,留给我教案 this version 1.0- of Book 2 of the System Description Zhaga requires a Luminaire manufacturer characterize the thermal performance—in terms of Rth,rear—of the Luminaire under the condition that the Luminaire is operated with Thermal Test Engine TTE-PHJ65-d locked into position,12 and provide the results on the data sheet of the Luminaire. See Annex B.
I珠心算怎么学n order to determine if—from a thermal point of view—a particular Socketable LLE can be used reliably in a particular Luminaire, it shall be verified that the applicable thermal resistance specified in the data sheet of the Luminaire is less than or equal to the maximum thermal resistance specified in the data sheet of the Socketable LLE. Here, the
applicable thermal resistance is the thermal resistance in the case of a power that is greater than or equal to the maximum thermal power applied at the Thermal Interface Surface listed in the data sheet of the Socketable LLE. (Informative) In case of a closed Luminaire design, the maximum total thermal power should be used instead of the maximum thermal power applied at the Thermal Interface Surface.
1. (Informative) As an example of an open Luminaire, consider the information listed in the data sheets of particular Socketable LLEs and Luminaires (note that the numbers in this example云南姜 are not necessarily realistic):
Socketable LLE data sheets: | data sheet#1 | data sheet #2 |
| Maximum total thermal power [W] | 23 | 38 |
| Maximum thermal power applied at the Thermal Interface [W] | 18 | 35 |
| Maximum allowable thermal resistance of the Luminaire [W/K] | 2 | 1 |
Luminaire data sheets | data sheet #1 | data sheet #2 |
| Thermal Resistance at 10 W [K/W] | 2.2 | 1.5 |
| Thermal Resistance at 20 W [K/W] | 1.9 | 1.4 |
| Thermal Resistance at 30 W [K/W] | 1.7 | 1.2 |
| Thermal Resistan项目实施流程ce at 40 W [K/W] | 1.6 | 0.9 |
| | | |
From these numbers is can be seen that Socketable LLE #1 can be used reliably in both Luminaire #1 and #2
(becau 1.9<2, and 1.4<2), whereas Socketable LLE #2 can be used reliably in Luminaire #2 only (becau 1.6>1 and 0.9<1).
6.2 Temperature uniformity
6.2.1 Thermal interface temperature uniformity requirement
The non-uniformity of the temperature distribution across the Thermal Interface Surface depends on the details of the construction of both the Socketable LLE and the Luminaire. This version 1.0- of Book 2 of the System Description Zhaga does not restrict this non-uniformity in the case of a arbitrary Socketable LLE being operated in an arbitrary Luminaire. Instead, this version 1.0- of Book 2 of the System Description Zhaga restric海葵ts the non-uniformity in the case of an arbitrary Socketable LLE being operated in Test Fixture TUTF-PHJ65d-x:
The non-uniformity of the temperature dist小米食物ribution across the Thermal Interface Surface shall be阅读记录卡10篇 such that the thermal spreading resistance Ri,j between any pair of the measurement points shown in Figure
