Research On Two Transistor Forward Converter With Synchronous Rectification

The operation of two-Transistor forward converter toponology and current control mode are discussed in this paper.The advantage and the drawback of the toponology are introduced. Using state-space averaging method this paper deduces the TTFC's small signal mode.Based on it the voltage control mode and current control mode are analyzed and compared.With the development of power electronical converters's application in telecom system ,converters with low output voltage and large output current become more and more important. Rectifying stage with diode or sckotty diode can't meet the needs of higher efficiency and lower size because forward drop of rectifier is great and rectifying dissipation is great in power converter.New generation of Power MOSFET has became the rectifying component due to the advantage of its low conduction resistance.The operation of synchronous rectification,the methods of driving the rectifying MOSFET and the application of synchronous rectification in kinds of toponologies are also introduced.The experiment to demonstrate the bi-directional conductibility of power MOSFET is also presented in this paper.A power supply of TTCF with synchronous rectification is designed.The waveform,experiment data and analysis of it are presented in this paper,which shows that the design is avaible in practice.