Operating Characteristics of Magnetic Frequency Multiplier with Core-Type Zero-Phase-Sequence Circuit

A new type of magnetic frequency multiplier is proposed for improved performance. This device has core-type output windings installed collectively by combining the cores into a T. The length of output winding of this type of device can be reduced to about 56 percent of the conventional type. The core advantages of this type of magnetic frequency multiplier are as follows: (1) high efficiency equivalent to a large-scale device can be obtained easily; (2) fluctuations in the output voltage can be reduced. In this paper, operation of a core-type frequency multiplier is analyzed by the harmonic balance method considering the unbalance of the circuit. The mechanism of the two-step jumps which occur in the nonlinear zero-phase-sequence circuit is clarified by results of the analysis.