Low noise multi-output and multi-resonant flyback converter for

Details Low noise multi-output and multi-resonant flyback converter for Low noise multi-output and multi-resonant flyback converter for

1995-06-07

1996-06-18

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, 363131, H02M 3335

Patent

active

055284817

ABSTRACT:
A converter for supplying various output voltages for a television receiver includes a multi-resonant circuit, including a resonant inductor, the leakage inductance of a flyback transformer, and a charging capacitor (including the parasitic capacitance of a switching transistor). This arrangement relaxes the slope of the voltages in the converter resulting in reduced radiated EMI. In addition, the values of the inductor and the capacitor are adjusted so that the switching transistor turns on at zero voltage and zero current so that the switching transistor is less stressed and the converter is capable of high frequency operation. Finally, the switching signals applied to the switching transistor are subjected to a filter-delay to lessen the slope of the signals thereby also resulting in a reduction in the EMI radiated from the driving circuit.

REFERENCES:
patent: 4788591 (1988-11-01), Decraemer
patent: 4868729 (1989-09-01), Suzuki
patent: 5204504 (1993-04-01), Tanaka
"Measuring, Suppressing, and Filtering Common Mode Emissions in Switching-Mode Power Supplies", Nave J. Mark, In proceedings of HFPC '90, pp. 285-293.
"Design of High-Density On-Board Single- and Multi-output Multi-Resonant Converters", W. A. Tabisz and F. C. Lee, In proceeding of HFPC '90, pp. 45-57.
"Recent Developments in High-Frequency Quasi-resonant and Multi-resonant Converter Topologies", F. C. Lee, W. A. Tabisz and M. M. Jovanovic In proceedings of EPE '89, pp. 401-410.
"Non-Resonant and Resonant Coupled Zero-Voltage-Switching Converters", C. Q. Lee, R. Liu and S. Sooksatra, IEEE Trans. on Power Electronics, vol. 5, No. 4, 1990, pp. 404-412.
"Characterization and Comparison of Noise Generation for Quasi-Resonant and PWM Converters", L. Hsiu, M. Goldman, A. Witulsdi, W. Kerwin, and R. Carlstem, In proceedings of PESC '91, p. 504-509.

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