synchronousrectified

Synchronous rectification is a technique used in power electronics to improve the efficiency of switching power supplies. It replaces the traditional rectifier diodes with active switching elements, such as MOSFETs. Diodes, while simple, have a forward voltage drop that dissipates power as heat. In synchronous rectification, the MOSFETs are controlled to turn on and off at precise moments, effectively acting as a diode with a much lower on-state resistance. This significantly reduces conduction losses, especially at low output voltages and high output currents, where the diode's voltage drop becomes a larger proportion of the total voltage.

The primary advantage of synchronous rectification is its increased efficiency, leading to less heat generation and smaller heatsinks. This is particularly important in applications like battery-powered devices and high-density power supplies where power conversion efficiency is critical. The control circuitry for synchronous rectification is more complex than for simple diode rectification, requiring careful timing to ensure the MOSFETs switch at the correct phase of the switching cycle. If the MOSFETs are turned on too early or too late, it can lead to shoot-through (where both the main switch and the synchronous rectifier are on simultaneously, creating a short circuit) or increased losses. Despite the added complexity, the benefits in efficiency often outweigh the drawbacks, making synchronous rectification a common feature in modern power converters.