Low loss snubber for power converters

Details Low loss snubber for power converters Low loss snubber for power converters

1982-02-22

1984-03-20

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, 363134, H02H 712, H02M 7537

Patent

active

044384866

ABSTRACT:
A low loss snubber provides stress relief for a first controllable semiconductor switch. The low loss snubber comprises a capacitor in series with a diode. This series combination is connected across the first switch, with the diode poled to conduct current to charge the capacitor when the first switch turns off. The low loss snubber further comprises an energy retrieval converter for removing energy from the capacitor when the first switch turns on. The energy retrieval converter has a second controllable semiconductor switch which is repeatedly turned on and off responsive to the first switch remaining in the closed position. An inductor means is in series with the second switch and the capacitor is provided for transferring the energy stored in the inductor means to an external load when the second switch is open.

REFERENCES:
patent: 4276588 (1981-06-01), McLyman et al.
patent: 4286314 (1981-08-01), Molyneaux-Berry
patent: 4336587 (1982-06-01), Boettcher, Jr. et al.
patent: 4355353 (1982-10-01), Farrer
E. T. Calkin and B. H. Hamilton, "Circuit Techniques for Improving the Switching Loci of Transistor Switches in Switching Regulators," IEEE Transactions on Industry Applications, vol. 1A-12, No. 4, Jul./Aug. 1976.
R. Wurslin, "Transistor Converter Operating on 380V Three--Phase Mains", 2nd Annual European Power Conversion Conf., Sep. 3-5, 1980, Munich pp. 2.4--1 to 2.4--14.
R. Goldfarb, "A New Non--Dissipative Load--Line Shaping Technique Eliminates Switching Stress in Bridge Converters", Proceedings of Powercon 8, 1981, pp. 1-6.
"Analysis and Design of a Highly Efficient Power Stage for an 18 KHZ, 2.5KW DC--to--DC Converter", R. E. Schroeder, IEEE, 7-81, CH1652--7/18/0000/0273.

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