Overview
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High current reactors with a high-frequency have a superimposed current
composed of a high-frequency ripple and direct current.
The performance of a reactor is evaluated by a stable inductance in a wide
direct current region.
The gap that is designed to prevent magnetic saturation from the core largely
affects the inductance. The gap is a vital parameter of the reactor's design.
This example analyzes the superimposed direct current characteristics of
a high current reactor with a high frequency. |
Superimposed Direct Current Characteristics
The relationship between the length of the flux path, the width of the
gap, and the inductance when the direct current is 25 A is indicated in
Table 1, the superimposed direct current characteristics in Fig. 1, and
the magnetic flux density distribution is indicated in Fig. 2.
The wider the width of the gap is, the smaller the inductance becomes,
as indicated in Fig. 1. The magnetic resistance of the entire magnetic
circuit is a series connection of the magnetic resistance for both the
core and the gap and the magnetic resistance of the gap increases based
on the width of the gap. As indicated in Fig. 1, the narrower the gap width
is the lower the direct current is when the inductance starts decreasing.
As indicated in Fig. 2, there is more magnetic saturation in the core as
the width of the gap decreases. |
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