Active Peltier Effect Heat Sink for Power Semiconductor Device Thermal Stability Enhancement

The failure caused by cumulative fatigue damage due to cyclical thermal stress is the dominant failure mode of power semiconductor devices, and it poses reliability concerns. In this regard, this research introduces a novel method for suppressing IGBT/
mosfet
chip thermal fluctuation. A Peltier effect heat sink (PEHS), which is a PN particle module embedded between the power devices base plate and the heatsink, and its two control strategies are proposed. Via adjusting the excitation current and power of the PEHS, the equivalent thermal resistance from the IGBT/
mosfet
chip to the ambient can be adjusted dynamically. It can adaptively suppress the junction temperature fluctuations without changing the converter control strategy as well as the output waveform. A theoretic model is built to quantify the power devices’ lifetime cycle against the excitation current and power of PEHS, and the three operating modes of the PEHS are analyzed with the model. The experimental study is conducted to validate that after using the PEHS proposed in this article, Δ
T_j
can be reduced by a maximum of 31.27%, and
T_m
can be reduced by a maximum of 36.67%. According to the Coffin–Manson model, the proposed method can effectively enhance the long-term reliability of the system.