Skip to Main Content
Power Electronics and Motor Drives
book

Power Electronics and Motor Drives

by Bogdan M. Wilamowski, J. David Irwin
October 2018
Intermediate to advanced content levelIntermediate to advanced
1015 pages
40h 24m
English
CRC Press
Content preview from Power Electronics and Motor Drives
29-6 Power Electronics and Motor Drives
A simplied steady-state thermal equivalent circuit of an LED system is shown in Figure 29.4 [27,28],
assuming that (1) the N LEDs are placed on the same heatsink with a thermal resistance of R
hs
, (2) the
LEDs have their junction-to-case thermal resistance R
jc
, and (3) the thermal resistance of the insulating
material (such as heatsink compound) used to isolate the LEDs from the heatsink is negligible.
Based on the model in Figure 29.4, the luminous ecacy of the LED system can be expressed as
E E k T T k k R NR P= +
( )
+ +
( )
o e a o e h jc hs d
1 (29.5)
So, the total luminous ux
v
is
φ
v o e a
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Electric Motors and Drives

Electric Motors and Drives

Austin Hughes

Publisher Resources

ISBN: 9781439802861