Synchronous rectifier power supply

2021.12.13

The core of the synchronous rectification circuit is MosFET. If the core of the Schottky rectification is the Schottky diode, then the core component of the synchronous rectification is the MosFET transistor. In fact, from the schematic diagram of the two, Schottky rectification and The structure of synchronous rectification is very close, basically replacing the Schottky diode on the lower side with a MosFET transistor. However, since the transistor allows the current to conduct reversely, it is not unidirectional like a diode, so if the transistors Q1 and Q2 are simultaneously Into the conduction state, then the current will directly enter the ground wire through Q1 and Q2, making the whole circuit unable to work, so the two MosFET transistors must work together, for this synchronous rectification requires an independent drive circuit to control the conduction of the two MosFETs. On and off, this is the biggest difference between synchronous rectification and Schottky rectification in circuit composition.

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