RC-Drives

Cost-Optimized IGBT for Consumer Drive Application

11

Already at switching frequency of 10 kHz a clear efficiency improvement is observed. At the

target f_sw of 18 kHz the RC-DF provides 2.8% improvement at 50W input power and 1.6% at

100W:

Figure 6: Inverter efficiency as a function of input power and switching frequency

3.2

Thermal behavior

The increased efficiency for the RC-DF translates in lower case temperature, as verified by

thermal images with Infrared camera:

Figure 7: Case temperature as a function of input power and switching frequency

The RC-DF shows outstanding thermal performance providing lower case temperature over the

entire frequency range: at the target switching frequency of 18 kHz, the case temperature is

lowered by 20°C.

-17°C

-20°C

+2.8%

+1.6%