The Double Forward Converter with Synchronous Rectification

Abstract:

In many switching power supply converters, diode rectifiers are used to obtain the DC output voltage. The conduction loss of these diodes rectifier contributes significantly to the overall power loss, especially for low-voltage, high-current converter applications. The conduction loss of rectifying diode is given by the product of its forward-voltage drop and forward conduction current. By replacing the diode rectifiers with a MOSFET operating as a synchronous rectifier (SR), the equivalent forward-voltage drop can be lowered and, consequently, the conduction loss can be reduced because the switching power supply converter need high efficiency. The double forward converter with synchronous rectification is proposed in this paper. The circuit’s guidelines of the double forward controller in the double forward converter and the synchronous rectifier controller in the synchronous rectification are also presented. Validity of the proposed double forward converter with synchronous is confirmed by simulations.

• Periodical: Applied Mechanics and Materials (Volume 781)
• Pages: 431-434
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.781.431
• Online since: August 2015
• Authors: Kumkrong Krajam*, Sakorn Po-Ngam
• Keywords: Double Forward, Switched Mode Power Supplies (SMPS), Synchronous Rectification

References

[1] Steve Mappus, Synchronous Rectification for Forward Converter, Fairchild Semiconductor Power Seminar & Communication, February 2010-(2011).

[2] Suresh Kariyada, Reverse-Current Phenomenon in Synchronous Rectifiers, International Rectifier, Fairchild , June (2009).