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[分享] Coupled inductors broaden DCDC

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发表于 2010-9-16 10:37 | 显示全部楼层 |阅读模式
Introduction
Recently, inductor manufacturers have begun to release
off-the-shelf coupled inductors. Consisting of two separate
inductors wound on the same core, coupled inductors typically
come in a package with the same length and width
as that of a single inductor of the same inductance value,
only slightly taller. The price of a coupled inductor is also
typically much less than the price of two single inductors.
The windings of the coupled inductor can be connected in
series, in parallel, or as a transformer. This article highlights
four DC/DC converter topologies that meet common
application needs with coupled inductors.
Clearly understanding the specifications of coupled
inductors is essential to using them to their full advantage.
Most of these coupled inductors have the same number of
turns—i.e., a 1:1 turns ratio—but some newer ones have a
higher turns ratio. The coupling coefficient, K, of coupled
inductors is typically around 0.95, much lower than a
custom transformer’s coefficient of greater than 0.99. The
mutual inductance of coupled inductors makes them perform
somewhat inefficiently in flyback applications and
can cause non-ideal (e.g., rounded instead of triangular)
inductor waveforms. Also, the current specifications for a
coupled inductor are different depending on whether its
windings are physically connected in series or in parallel.
For example, when the windings are connected in series,
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