Chokes for DC-DC converters

The primary function of chokes used in DC converters is to reduce the ripple at the converter output.

Chokes are typically used in non-isolated boost and buck converters, switched capacitor systems, and others of analogous design. Depending on the converter's design, chokes can be used as discrete components or as coupled systems for converters with many switching targets.

Chokes for DC-DC converters are characterized by a maximum constant operating current at a specific amplitude and ripple frequency. In some applications, overload capability and frequency characteristics are also required.

Typical applications are DC converters used in multi-channel renewable energy conversion systems, car chargers, electric car main power circuit, battery power systems, and railway converters.

Typical parameters:

  • Rated current: depending on the application, typically up to 1,000 A

  • Initial inductance

  • Current characteristics

  • Operating frequency

  • Rated voltage: ≤ 5,000 V

  • Insulation class: B, F, or H

  • Protection rating: IP00-IP67

Design based on any core shape that ensures optimum performance. Typically, block cores are used, including those with elliptical cross-section, laminated, toroidal, in various shapes, e.g. EE, ETD, PQ, etc. Special designs are also available that integrate the choke design into a uniform block using magnetic coupling.

Depending on the solution, the components intended for installation in the system can be of an open design or can be sealed by encasing in resin or by pressure-vacuum impregnation.

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