Study on a double auxiliary resonant commutated pole three-phase soft-switching inverter

For the problem that the auxiliary switches of auxiliary resonant commutated pole (ARCP) inverters achieve zero-voltage-switching (ZVS) turn-off difficultly in practical application, this paper presents a double ARCP inverter topology and modulation strategy based on an improved ARCP inverter. The proposed inverter not only inherits all advantages of ARCP inverters discussed previously, but also avoids that the ZVS turn-off of auxiliary switch is affected by the parasitic inductance and capacitance in circuit coming from wiring process effectively. So, it is assured that the auxiliary switches achieve ZVS turn-off reliably. According to the equivalent circuit in different operation modes under the proposed modulation strategy, this paper analyzed the operation principle, soft-switching condition and parameter design procedure of the proposed double ARCP inverter. Finally, a 10 kW-16 kHz double ARCP inverter prototype with insulated gate bipolar transistor (IGBT)-based switches was built. Experimental results are given to demonstrate the validity and features of the proposed inverter. © 2015 Chin. Soc. for Elec. Eng.