Fundamental topologies of three-phase LC resonators and their applications for oscillators Academic Article uri icon


  • There exists an increasing need in power electronics for efficient three-phase inverters. They can find application in power control of AC motors or as an intermediate stage in DC-DC converters. It seems that employing three-phase oscillators for such inverters can be an appropriate solution. However, for the sake of efficiency and also simplicity, it is desirable that the three-phase oscillators should consist of high-Q three-phase resonators. The authors describe several circuits that can be considered three-phase resonators. The discussion is mainly related to the topological structures of the systems. A numerical simulation of their dynamics is also given. The three-phase resonators consist of six reactors (three inductors and three capacitors), and not merely of three as might have been expected. Active elements are added mainly for sustaining the oscillations and to assist in balancing the three-phase system. Some of the models are advantageous since they have the inherent property of constraining the DC bias in the three-phase variables, both in the currents and in the voltages, to zero

publication date

  • July 1, 1993