Synchronous rectifier circuit and power supply

Details Synchronous rectifier circuit and power supply Synchronous rectifier circuit and power supply

2006-02-28

2006-02-28

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S282000, C323S274000

Reexamination Certificate

active

07005834

ABSTRACT:
In a power supply of a synchronous rectification type, the self-turn on phenomenon of MOSFET is suppressed without increase of the drive loss to thereby improve the power efficiency. In a synchronous rectifier circuit, a threshold value of a commutation MOSFET is made higher than that of a rectification MOSFET and particularly a threshold value of a commutation MOSFET3is made 0.5V or more higher than that of a rectification MOSFET2. The threshold value of the rectification MOSFET2is lower than 1.5V and the threshold of the commutation MOSFET3is higher than 2.0V.

REFERENCES:
patent: 5920475 (1999-07-01), Boylan et al.
patent: 6087813 (2000-07-01), Tobita
patent: 6356064 (2002-03-01), Tonda
patent: 6894468 (2005-05-01), Bretz et al.

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