DESIGN OF SYNCHRONOUS RECTIFIER USING FORWARD TOPOLOGY

    This project design based on a synchronous rectifier using forward topology. Using a diode rectifier on the secondary side of the converter, conduction loss of diodes contributes significantly to the overall power loss in a power supply, especially in low output-voltage applications. Replacing the diodes with very low RDS (on) power MOSFETs as the output rectifiers in the forward converter, so-called Synchronous Rectification, is a commonly used technique to improve the efficiency of DC/DC converters with low output voltage (≤5V) and high output current. Control of the synchronous rectifiers in forward converters has been accomplished in different ways, from self-driven to complexly controlled techniques. Most existing control techniques allow the synchronous rectifier’s body diode to conduct for small-time intervals, thus degrading efficiency. The topology to eliminate body diode conduction loss is discussed to improve the efficiency of the converter. A forward converter that can supply low-voltage and high current has to design and test. The two diodes in the secondary side of the converter can be normal rectifier diodes, rectifier Schottky diodes, or MOSFETs. The following two types of converters are designed using Matlab-2007b and the results are compared. The specifications of the converters are 12V input, 1V, 20A output at switching frequency of 100 kHz.
1. Forward converter using secondary side diode rectifier.
2. Synchronous rectifier using low on-state resistance MOSFETs.

Reference Paper: Design considerations for Forward Converter with Synchronous Rectifiers
Author’s Name: 
Milan M.Jovanovic, Jen-Ching Lin and Chen Zhou
Source:
Power Conversion-Delta Art
Year: 1993

Click here to DOWNLOAD the reference PDF.

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