The study of a synchronous rectifier converter current detection method

摘要

For the traditional current detection method of a synchronous rectifier converter is easy to make the additional power loss and low detection accuracy such problems, it proposes a new current detection method, which detects the current using the conduction voltage drop of the synchronous rectifier, by introducing a negative feedback loop to force the voltage equal, which across the operational transconductance amplifier, adjusting the resistance value connected to both ends of the operational transconductance amplifier to increase the accuracy of current detection. This method is no additional power relative to the entire system, which overcomes the conventional problems in the current detection. Simulation result shows that the lossless current sensing method is feasible, and can be achieved.