Magnetic integrated inductor

Abstract

The invention relates to a magnetic integrated inductor. The magnetic integrated inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, at least two middle column magnetic cores with windings and at least one high-magnetoconductivity magnetic core, wherein the upper yoke magnetic core and the lower yoke magnetic core are arranged oppositely; the at least two middle column magnetic cores are arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least one high-magnetoconductivity magnetic core is arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least two middle column magnetic cores, the upper yoke magnetic core and the lower yoke magnetic core form a plurality of first magnetic circuits; the at least one high-magnetoconductivity magnetic core, the upper yoke magnetic core and the lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of each high-magnetoconductivity magnetic core is greater than or equal to 1000; given that the saturation flux density of each of the upper yoke magnetic core and the lower yoke magnetic core is Bs(B), the net sectional area of each magnetic circuit is Ae(B), the saturation flux density of each high-magnetoconductivity magnetic core is Bs(A), and the net sectional area of each magnetic circuit is Ae(A), Ae(A)* Bs(A)<= Ae(B)* Bs(B)*50%.

Description

technical field [0001] The invention relates to an inductor, in particular to a magnetically integrated inductor capable of suppressing common-mode current. Background technique [0002] Components such as photovoltaic inverters, high-power UPS (uninterruptible power supply), and motor-driven frequency converters that realize three-phase AC inverter output need to use AC inverter output passive LC filter networks such as LC or LCL in the output power circuit , to achieve the suppression of the high-frequency pulsation component of the output current, so as to meet the requirements of its output high-order harmonics and grid-connected EMC (Electro Magnetic Compatibility, Electromagnetic Compatibility). In order to further reduce the size and reduce the cost of the product, the inverter AC inductors of each phase use three-phase coupled inductors to replace the independent single inductors for each phase, which has become an important choice for inverter designers. [0003] S...

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Problems solved by technology

[0004] The existence of this zero-sequence current increases the leakage current of the inverter system to the ground, and in severe cases, it creates a safety risk; in addition, the current starts from the midpoint of the capacitor of the inverter, passes through the high-frequency inverter circuit, the AC inverter Variable inductor 121, filter capacitor 122, and finally returning to the midpoint of capacitor 101 on the DC side form a current path

This zero-sequence current, because it is not output but only circulates inside the inverter 100, will increase the loss of the semiconductor inverter bridge arm and the AC inverter inductor 121, so that the working efficiency of the inverter 100 will be greatly reduced. Some components such as the AC inverter inductor 121 will also have serious abnormal heating

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