Resonant Inductor for VHF Power Supply
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
This article describes a design of a power inductor to operate at hundreds of kilohertz without overheating. A basic resonant converter off-line switching power supply topology is shown in Fig. 1. Present literature describes advancements in the frequency of operation into the hundreds of kilohertz (Very High Frequency (VHF), affording advantages in size and weight reduction of such power supplies. Special problems arise at VHF in the design of the primary inductor for output powers of 50W or more. The problems can be identified by reviewing a typical inductor designed for lower frequencies, or DC filter choke applications. Fig. 2 shows a typical low frequency inductor construction. The center portion of the core, bobbin, and winding is shown in cross-section.