高周波電力制御磁気増幅器用磁心の動特性

抄録

In order to make more compact power supplies for electronic equipments, switching procedure is introduced and the conversion frequencies are increasing exceeding 100kHz. Magnetic amplifiers regulating these power supplies are spreading for the robustness, the noise suppressing capability and the simplicity of control. The properties of magnetic amplifier cores in the frequency range exceeding 100kHz are, however, not always clear.
The authors measure the dynamic characteristics of square-loop tape wound cores and discuss how to estimate the core properties appropriate to the high frequency magnetic amplifiers on the basis of magnetic domain theory. And formulae describing control magnetization characteristic are derived taking into account the variation of magnetic domain configurations.
We conclude that the cores should have good squareness, high resistivity and the tape thickness should be 15μm or less, and the lower saturation flux density is better.