This Application note describes a new back current circuit (BC2) for PFC applications, based on the soft switching method. The patented circuit has better efficiency/cost/power and density/EMI trade-offs than high voltage SiC Schottky diodes, and is suitable for applications such as desktop server power supplies, solar inverters and µinverters.
The document addresses the challenges of minimizing power losses in high-efficiency switching power supplies, specifically focusing on reducing switch-on losses caused by diode reverse recovery. It analyzes existing solutions such as SiC/GaN diodes, active ZVT circuits, and passive recovery circuits, highlighting their limitations regarding cost, complexity, or practical design constraints.
The goal is to reduce both power conduction and power switching losses without significantly increasing the power supply cost.
The goal is to reduce both power conduction and power switching losses in high efficiency switching power supplies.