Self-Gapping, Aligning Inductor Core
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Output filter inductors for high current power supplies can be formed by surrounding the output bus with a core of magnetic material. In order to accommodate the DC flux associated with the DC current in the bus, the magnetic flux path must gapped. The conventional approach to providing this gap is to use matching core halves with flat mating surfaces. The core halves are assembled around the core with spacers of non-magnetic material separating them to provide the gap. This approach requires extra pieces (the spacers) and brackets or strapping which must hold the core halves together against the spacers and aligned with each other in the direction along the bus bar. In the structure described here, the core halves are provided with steps or posts on the mating surfaces.