DKIL-0246-2001

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Common Mode Chokes (CMCs) are electrical components used to provide noise rejection in electrical circuits. DKIL-0246-2001 is an international standard specification for CMCs, describing the application field and working principle of the components.

CMCs function both as an inductor and a transformer, working by rejecting common mode currents but passing differential signals. This is achieved by having a single winding wrapped around the magnetic core of the CMC, allowing the components to provide a low impedance path for the differential signals while blocking the common mode signals. This makes CMCs ideal in power supplies where the prevention of common mode noise is required.

DKIL-0246-2001 defines the application field of CMCs which are mainly used for switching power supplies, LED drivers and soft start power supplies. This international standard also specifies the material and dimensions for CMCs along with the working principle. A common mode current will be blocked by a CMC when two windings with different winding numbers correspond with each other, preventing the noise current from entering the equipment.

The correct CMC should be chosen for each application, taking into account the material, size and inductance for maximum noise reduction. DKIL-0246-2001 provides the parameters and methods used to select the CMCs required in a given application. It is also important to consider the environment the CMC will be used in as different materials have different temperature ranges and levels of corrosion resistance, which will also influence the selection of the component.

CMCs provide effective impedance isolation against signal lines, providing both surge suppression and noise protection. When selecting CMCs for an application, DKIL-0246-2001 should be consulted to ensure that the product will meet the design requirements. With the right selection of CMCs, it is possible to achieve an efficient, durable and cost-effective design for the application.

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