Bridge-buck converter with self-driven synchronous rectifiers

Details Bridge-buck converter with self-driven synchronous rectifiers Bridge-buck converter with self-driven synchronous rectifiers

2005-02-22

2005-02-22

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S127000, C363S132000

Reexamination Certificate

active

06859372

ABSTRACT:
A non-isolated bridge-buck DC—DC converter has self-driven synchronous rectifiers Q5Q6in the buck circuits28 30. Gate electrodes of the synchronous rectifiers Q5Q6are connected to midpoints24A24B of the bridge circuit. The voltage at the midpoints provides the necessary voltage waveform for switching the synchronous rectifiers Q5Q6. In another aspect of the invention, voltage shift circuits34are provided between the midpoints and the gates of the synchronous rectifiers. The voltage shift circuits are necessary in some embodiments to make sure that the synchronous rectifiers are turned completely OFF when necessary. The present invention provides a more power efficient and less expensive technique for controlling the synchronous rectifiers compared to conventional external driver circuitry.

REFERENCES:
patent: 4873618 (1989-10-01), Fredrick et al.
patent: 5768112 (1998-06-01), Barrett
patent: 6504739 (2003-01-01), Phadke
patent: 6757184 (2004-06-01), Wei et al.

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