User guide
37 of 41
v1.0
2021-03-05
5 kW two-channel interleaved CCM PFC EVAL board
IKW40N65WR5, IDW60C65D1 and 1ED44175 in high frequency PFC application
System performance
Figure 38
Thermal capture at room temperature at nominal input (180 V) and full load condition for
PFC operation
Due to two powerful fans in an enclosed environment, the PFC chokes are not the hotspot of the board, as can
be seen in Figure 38. One of WR5 IGBT (Q3) is the hottest power device on this board, which is far away from the
cooling fans. Accoding to temperature data collected by Keysight 34970A with thermal couples, as shown in
Table 5, the highest temperature of the IGBT is 84.2
℃
at full load while input voltage is 180 V
AC
. Fortunately, in
floor-standing air-conditioner applications, its output power will be derated at low-input voltage, so, further
temperature data at half load is also shown in Table 5, while input voltage is 180 V
AC
, the highest temperature of
IGBT is only 45.9
℃
.
Table 5
Temperature of power semiconductors
Devices
V
IN
=230 V
AC,
full load
V
IN
=180 V
AC,
full load
V
IN
=180 V
AC,
half load
Q2 (IKW40N65WR5)
51.7
℃
67.8
℃
39.8
℃
D19 (IDW60C65D1)
61.6
℃
74.2
℃
40.3
℃
Q3 (IKW40N65WR5)
62.1
℃
84.2
℃
45.9
℃