User guide
32 of 45
V 1.0.1
2021-01-27
REF-AIRCON-C302A-IM564 user guide
Air conditioner application reference design kits
System performance
4
System performance
4.1
Thermal characterization
The thermal characterization test was performed under the following conditions: T
a
= 25°C, V
AC
= 220 V, 6 kHz
motor PWM and 40 KHz PFC PWM frequency, and under different phase-current values until the surface
temperature of the main components reached 105°C .
Figure 26 shows the thermal characterization of REF-AIRCON-C302A-IM564, which depict the maximum motor
power at different cooling modes:
-
1400 W at natural cooling mode, IPM T
C
reaches 105°C
-
2500 W at 1 m/s air cooling mode, input
common-mode choke
reaches 105°C
Figure 26
REF-AIRCON-C302A-IM564 thermal characterization ( Input power vs IPM temperature
rise )
4.2
NTC thermistor characteristics and overheat protection
IMC302A’s MCE firmware has overheat protection; pin 13 (NTC/AIN4) is the dedicated input of NTC temperature
sensing. IM564 IPM has an internal NTC resistor, which connects to VFO multifunction pin, as shown in Figure
27.
Figure 27
Temperature sensing for IMC302A and IM564
0
10
20
30
40
50
60
70
80
90
0
500
1000
1500
2000
2500
3000
De
lta
T
(
℃
)
Input Power (W)
Input Power Vs Delta T
Natural cooling
1m/s Air cooling
