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This article discusses how coil imperfections lead to magnetic flux leakage, enabling the creation of common-mode inductors that combat interference. It also highlights using leakage inductance in filter design to enhance performance.
In a theoretical model of ideal inductance, the entirety of flux remains concentrated at the core of the coil post-winding. However, in practical scenarios, coils are often wound with gaps or lack tightness, leading to magnetic flux leakage. Common-mode inductors feature two windings separated by a significant gap, resulting in the generation of flux leakage and the formation of a differential-mode inductor. Consequently, common-mode inductors typically possess a certain degree of attenuation against differential-mode interference.
In the realm of filter design, leveraging leakage inductance is commonplace. For instance, in a typical filter setup, solely a common-mode inductor is integrated, utilizing its leakage inductance to produce an appropriate level of differential-mode inductance to suppress differential-mode currents. At times, the leakage inductance of the common-mode choke is intentionally increased to enhance the differential-mode inductance, thereby achieving superior filtering efficacy.
In a theoretical model of ideal inductance, the entirety of flux remains concentrated at the core of the coil post-winding. However, in practical scenarios, coils are often wound with gaps or lack tightness, leading to magnetic flux leakage. Common-mode inductors feature two windings separated by a significant gap, resulting in the generation of flux leakage and the formation of a differential-mode inductor. Consequently, common-mode inductors typically possess a certain degree of attenuation against differential-mode interference.
In the realm of filter design, leveraging leakage inductance is commonplace. For instance, in a typical filter setup, solely a common-mode inductor is integrated, utilizing its leakage inductance to produce an appropriate level of differential-mode inductance to suppress differential-mode currents. At times, the leakage inductance of the common-mode choke is intentionally increased to enhance the differential-mode inductance, thereby achieving superior filtering efficacy.
