Inductance element provided with permanent magnet bias magnet and bypass magnetic core

Abstract

An inductance element having a permanent magnet bias magnet and a bypass magnetic core comprises a coil, a magnetic core provided with at least one air gap inside the coil, partial bypass soft magnets which are form into the air gap together and a permanent magnet which is in series connection on lateral side of the air gap. According to the inductance element, the coil wraps the magnetic core; at least one air gap is formed in the magnetic core; magnetic core portions, which are close to the air gap, are in series connection with partial bypass soft magnet portions which are provided with the air gap; the permanent magnet is in series connection with an air gap opening, so that the coil magnetic branched circuit, the air gap magnetic branched circuit and the permanent magnet magnetic branched circuit are formed; the permanent magnet for the inductance element performs reverse pre-magnetic-biasing on the coil magnetic branch circuit and the output magnetic energy product of the permanent magnet is adjusted according to the size of the air gap; the direct current component of the coil current and magnetic flux density superposed through synclastic pre-magnetic-biasing of the permanent magnet are reduced, the disadvantages that in a traditional permanent magnet bias magnetic inductance element, magnetic flux density of a synthetic pre-magnetic-biasing branch is increased and inductance value is decreased, the inductance value and power density of the inductance element under certain direct current bias current are improved due to the fact that the length of partial bypass soft magnets is one fifth of the length of a main magnetic circuit.

Description

technical field [0001] The invention relates to an inductance element with a permanent magnetic bias and a bypass magnetic core, which is suitable for the situation that the working current of the coil of the inductance element has a relatively large DC component. Background technique [0002] Power inductance components are widely used in power electronic circuits, but the DC component often contained in the working coil current will saturate the magnetic core, greatly reducing the inductance, thereby increasing electromagnetic interference, reducing the performance of the whole machine, and even causing equipment failure. [0003] The traditional main measures and disadvantages of preventing the inductance drop of the power inductive component due to the DC bias of the magnetic core are as follows: [0004] Measure 1: Reserve an air gap on the soft magnetic core forming the main magnetic circuit [0005] Disadvantages: If the reserved air gap is too small, the effect of p...

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Problems solved by technology

[0005] Disadvantages: If the reserved air gap is too small, the effect of preventing DC bias is limited, and if the air gap is too large, the inductance of the inductance element will be greatly reduced

[0007] Disadvantage: Permanent magnet and electromagnetic are connected in series, the overcurrent of the main circuit will cause the permanent magnet to demagnetize

[0009] Disadvantages: The magnetic flux generated by the permanent magnet is closed in one direction. Presetting it on the closed main magnetic circuit of the inductance element will generate the same direction pre-bias and reverse pre-bias at the same time, although the reverse pre-bias branch can Reduce the cross-sectional area of ​​the magnetic core, but the overall effect is offset by the harm caused by the increase of the magnetic flux density of the same pre-biased magnetic branch

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