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Design and Integration of Interphase Inductors for Interleaved Three-Phase Voltage-Source-Inverters in DC-fed Motor Drive Systems
Fig. 1. Interleaved 2L dc-fed motor drive system.
However, interleaving also creates a voltage difference between the two converters, and requires interphase inductors to limit the circulating current. The additional weight of interphase inductors make the passive component heavier in the interleaving topology in motor drive applications. In order to reduce the total weight of passive components, an interphase inductor can be integrated with the load indcutor or DM inductors in the EMI filter with negligible increase in the weight, as shown in Fig. 3. The maximum integrated inductance is related to the interleaving angle and system operation conditions, which can be designed analytically.
Fig. 2. (a) Impact of Interleaving with different Interleaving angles: On-voltage harmonics.
Fig. 2. (b) Passive component weight reduction.
Fig. 3. (a) Integration and design results of interphase inductors: Integration of interphase inductors.
Fig. 3. (b) Integrated inductor design results.
