Abstract
The frequency-dividing-type three-phase inverter, Which consists of a single-phase square wave inverter and a three-phase ferro-resonant circuit, has excellent efficiency, constant-voltage characteristics, and three-phase balance. These advantages make it suitable for use as a DC-AC converter and a UPS. However, When this three-phase inverter is used as a UPS, a start-up circuit with a complicated sequence is needed to reduce the capacity of the single-phase inverter. If the sequence is simplified, the phase sequence of the voltage cannot be determined, Which creates another problem. In this paper, the relationship between circuit imbalance and the phase sequence of three-phase voltage is reviewed through experiment and analysis. In consequence, the relationship between circuit imbalance and phase sequence is clarified. The results given in this paper provide useful information on circuit constants that can reduce costs by simplifying the start-up circuit of a frequency-dividing-type.
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