The synchronous rectification is a technique for improving efficiency of power converters in power electronics. It consists of connecting a diode and a transistor (usually a power MOSFET) in parallel. When the diode is forward-biased, the transistor is turned on, to reduce the voltage drop. When the diode is reverse-biased, the transistor is turned off, so no charge can flow through the circuit. This way, a rectifying characteristic is obtained, without the forward voltage drop associated with diodes in the on-state.
Synchronous rectification. (2007, December 24). In Wikipedia, The Free Encyclopedia. Retrieved 18:52, February 22, 2008, fromhttp://en.wikipedia.org/w/index.php?title=Synchronous_rectification&oldid=179939538
-
STSR3 Synchronous rectifiers smart driver for flyback
STSR3 Smart Driver IC provides a high current outputs to properly drive secondary Power MOSFETs used as Synchronous Rectifier in low output voltage, high efficiency Flyback Converters. From a synchronizing clock input, withdrawn on the secondary side of the isolation transformer, the IC generates a driving signal with set dead times with respect to the primary side PWM signal.
http://www.st.com/stonline/products/literature/ds/9090.pdf -
STSR30 Synchronous rectifier smart driver for flyback
The IC operation prevents secondary side shoot-through conditions at turn-on of the primary switch providing anticipation in turn-off the output. A special Inhibit function, detecting the voltage across the Synchronous FET, allows to shut-off the drive output during discontinuous mode condition.
http://www.st.com/stonline/products/literature/ds/9833.pdf -
Forward synchronous rectifiers smart driver
STSR2P Smart Driver IC provides two complementary high current outputs to drive Power Mosfets. The IC is dedicated to properly drive secondary Synchronous Rectifiers in low output voltage, medium power, high efficiency Forward Converters.
http://www.st.com/stonline/products/literature/ds/9751.pdf -
Synchronous Rectification in High-Performance Power Converter Design
Expert tips, tricks, and techniques for powerful designsPower converters are becoming increasingly commonplace in the electrical industry. Product manufacturers and suppliers of electrical equipment are demanding ever-increasing functionality (i.e., lower output and input voltages, faster transient response, higher currents) from their power supply systems.
To meet these demands, switching power supply designers in the late 1990s began adopting Synchronous Rectification (SR) — the use of MOSFETs to achieve the rectification function typically performed by diodes. SR improves efficiency, power density, manufacturability, thermal performance, and reliability, and decreases the overall system cost of power supply systems. This article will examine the advantages of SR and discuss the challenges encountered in its implementation.
http://www.national.com/appinfo/power/files/national_power_designer112.pdf -
Synchronous Dual Mode Phase Modulated Full Bridge Controllers
The LTC®3722-1/LTC3722-2 phase shift PWM controllers provide all of the control and protection functions necessary to implement a high efficiency, zero voltage switched (ZVS), full bridge power converter. Adaptive ZVS circuitry delays the turn-on signals for each MOSFET independent of internal and external component tolerances. Manual delay set mode enables secondary side control operation or direct control of switch turn-on delays.
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1113,P2305,D3759
