ESBT（R）: Cost effective technology for high efficiency single switch AC/DC converter topologies

摘要

Today’s consumer and computer market is characterized by strong cost pressure on the final products. This has a significant impact on AC/DC converter producers who are required to reduce the cost of power supplies at all power levels, while improving efficiency, power density and stand-by power features. Recently released in the market, ESBT? Meets such requirements with a dedicated implementation of this new four terminal technology. In fact, a new series of monolithic ESBTs, with a breakdown voltage ranging from 900 V to 1200 V, has been developed for single phase off -line power supplies. This paper will describe the technology of the new power switch and its main characteristics that make it suitable for high voltage, high switching speed applications. A new simple and cost effective base driving network particularly suitable for flyback converters is also described. The advantages of using ESBT are detailed through implementation in several topologies and at different power levels. The results of the analysis demonstrate how ESBT can improve the power supply efficiency while keeping the costs down. The article will focus on the implementation of ESBT in the two most common topologies used in low/medium power converters: QR (quasi resonant) and QR-ZVS (Zero Voltage Switching).