DC converters with constant and variable duty ratio switching

Details DC converters with constant and variable duty ratio switching DC converters with constant and variable duty ratio switching

2011-05-31

2011-05-31

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S124000, C323S267000

Reexamination Certificate

active

07952892

ABSTRACT:
A DC converter comprises a half bridge supply circuit and one or more flyback or forward converter output circuits, and optionally also an LLC converter whose control can determine a common variable switching frequency. The half bridge supply circuit produces a 50% duty output alternating between two input voltages, such as zero and a voltage Vin. In each flyback or forward converter output circuit, a switch connects a transformer primary to the half bridge supply circuit output in a PWM controlled manner to regulate a respective flyback or forward converter DC output which is produced by the converter output circuit, with a duty ratio less than 50% whereby switching losses are reduced. Soft switching is further facilitated by the half bridge supply circuit having two transistors controlled in a complementary manner.

REFERENCES:
patent: 4975821 (1990-12-01), Lethellier
patent: 5838558 (1998-11-01), Tan et al.
patent: 6181585 (2001-01-01), Cardwell et al.
patent: 6344979 (2002-02-01), Huang et al.
Bo Yang, “Topology Investigation for Front End DC/DC Power Conversion for Distributed Power System”; Sep. 12, 2003, Blacksburg, VA, U.S.A.

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