Designing for Efficiency
7 www.cadence.com
5. Simulation Results
5.1 Efficiency Improvement
Replacing silicon devices with SiC improves overall converter efficiency by more than 7.6%, primarily due to reduced switching
and diode losses.
5.2 Loss Distribution
Waveforms show:
f
Shorter switching intervals
f
Reduced overshoot energy
f
Lower diode commutation stress
The visual reduction in loss waveforms confirms that efficiency improvement originates from physical device behavior.
5.3 Real-World Energy Impact
A switching loss reduction of approximately 10.6 W produces:
For one million systems:
6. Thermal and Reliability Implications
Reduced loss lowers junction temperature:
Lower temperature improves lifetime and allows smaller cooling solutions. Reduced thermal stress slows material degra-
dation, decreases thermomechanical fatigue, and improves long-term reliability of both semiconductors and passive compo-
nents.
As converter efficiency increases, system designers can often reduce heatsink size or airflow requirements. This improves
power density and reduces mechanical complexity while maintaining safe operating margins.
