Asymmetrical duty cycle power converter

Details Asymmetrical duty cycle power converter Asymmetrical duty cycle power converter

1991-10-10

1993-09-14

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363 56, 363 98, 363132, H02M 3335

Patent

active

052455203

ABSTRACT:
Operating a bridge type PWM switch mode power converter with asymmetrical duty ratios can eliminate switching losses with no increase in conduction loss. Included are three circuits, a full bridge buck converter, a half bridge buck converter, and a full bridge boost converter. These converters are an improvement over existing zero switching loss converter circuits in that they eliminate the large peak switch currents and voltages typical of existing circuits. The peak switch voltages found in these circuits are as low as those seen in standard PWM switch mode converters, and allow the use of efficient low voltage switches. The low peak and rms current delivered by the switches further improves efficiency, and the elimination of switching losses increases efficiency and allows operation at higher frequencies with the resultant benefit of smaller component size.

REFERENCES:
patent: 4276588 (1981-06-01), McLyman et al.
patent: 4855888 (1989-08-01), Henze et al.
patent: 4864479 (1989-09-01), Steigerwald et al.
patent: 5132889 (1992-07-01), Hitchcock et al.
patent: 5159541 (1992-10-01), Jain

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