Overview
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A high-frequency reactor, used in equipment such as DC-DC converters, has
a high-frequency current accompanying the switching 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 frequency reactor. |
Superimposed Direct Current Characteristics
| The superimposed direct current characteristics when the width of the gap
is changed are indicated in Fig. 1. The magnetic flux density distribution
of the core is indicated in Fig. 2. The inductance decreases more rapidly
as the direct current increases as indicated in Fig. 1. This is caused
by magnetic saturation as indicated in Fig. 2. The sensitivity of the inductance
for the current variation decreases because the magnetic resistance of
the magnetic circuit is transferred by the gap as it gets wider. |
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