System with open-loop DC-DC converter stage

Details System with open-loop DC-DC converter stage System with open-loop DC-DC converter stage

1997-10-17

1999-04-13

Riley, Shawn

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363132, 307 82, H02M 7122

Patent

active

058944125

ABSTRACT:
Innovative systems and methods for advantageous use of a new isolated power converter topology, in which transformer isolation is provided by a very simple DC-DC converter operated in open-loop mode (with each switch running at a constant duty cycle of approximately 50%, to achieve an effective duty cycle of approximately 100%), and feedback or modulation is instead applied to a preconverter stage which also does power factor corrections. Since the isolation stage is operated at a constant duty cycle, distortion can be minimized and its efficiency can be fully optimized, with a simple circuit and small component count. Unlike a flyback converter, only a very small inductance is required. A simple control architecture is used with current control loop. The disclosed circuit tightly clamps the voltages on the switch and on the transformer, with no ringing nor overshoot.

REFERENCES:
patent: 3490027 (1970-01-01), Galetto et al.
patent: 4811185 (1989-03-01), Cook et al.
patent: 5109185 (1992-04-01), Ball

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