| Abstract |
Conventional SRM inverters are hard-switched resulting in significant power device stresses during switching events, high levels of electromagnetic interference, and efficiency reduction due to power device switching losses. This paper introduces a quasi-resonant dc link power electronic circuit topology and gating control strategy which insures soft switching of an SRM inverter. Soft switching enables substantially higher (ultrasonic) switching frequencies with reduced device stresses. The proposed circuit utilizes an auxiliary resonant commutated pole (ARCP) to create the quasi-resonant dc link. The LC resonant circuit can be triggered, on demand, by auxiliary power electronic switches to create a zero-voltage soft-switching opportunity for the inverter switches, thereby ensuring near lossless switching. |
