DESIGNING OFFLINE AC/DC SWITCHING POWER SUPPLIES,

摘要

In an effort to meet worldwide efficiency requirements, engineers are designing offline power supplies integrating high-efficiency switching-regulator-control circuits. This approach uses less copper and is thus less expensive than that of conventional linear supplies with large transformers and no control IC. Designing these offline switching power supplies, however, brings a difficult set of problems, including EMI (electromagnetic interference), inrush current, input-capacitor discharge, and universal-input requirements. There are various approaches to dealing with these issues.