|Key considerations include: Inductance, peak current, operating frequency, ripple current, physical size, temperature rise, audible noise and cost. The trade-off¡¯s in design are driven by the priorities of the application, this effects proper core selection, wire and winding configuration.
Part of Precision¡¯s design approach begins with listening to the customer and gaining a thorough understanding of their unique application needs. The approach continues with review of the design theory and device trade-offs, samples for design verification and a review of global manufacturing and delivery alternatives. The goal is to respond with solutions on a timely basis by clearly reviewing and understanding all key considerations.
A number of considerations are examined during Precisions¡¯ design approach for PFC inductors:
1) Balanced Performance/Cost - Toroid Design Alternative. A lower performance core will provide inductance stability over the current range and achieve required inductance in the same physical package. This will increase the core loss and introduce the possibility of audible noise under high ripple current conditions.
2) Efficient Cost - Toroid Design Alternative. This design will produce low core loss with low temperature rise and good magnetostriction characteristics. Alternative core materials can yield a lower cost. A larger size may be needed to achieve the required inductance.
3) E-core Alternative: The variety of sizes and materials offer a wide range of form factors. Bobbin construction simplifies manufacturing and mounting to the PCB.