Soft-switched boost converter with isolated active snubber

Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source

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363 21, 363 25, G05F 156

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active

059594381

ABSTRACT:
A boost converter employs an isolated active snubber to reduce the losses caused by the reverse-recovery characteristic of a boost rectifier and the turn-on discharge loss of the output capacitance of the boost switch. The losses are reduced by inserting the primary winding of a coupled-inductor in the series path of the boost switch and the rectifier, to control the rate of current change (i.e., the di/dt rate) of the rectifier during its turn-off, and to create the conditions for zero-voltage turn-on for the boost switch. The energy from the inductor, after the boost-switch is turned off, is delivered to the output via the secondary winding of the coupled-inductor which is connected in series with a clamping capacitor and an auxiliary switch to form an isolated active snubber. The same technique can be extended to any member of the PWM-converter family.

REFERENCES:
patent: 5287261 (1994-02-01), Ehsani
patent: 5293111 (1994-03-01), Weinberg
patent: 5418704 (1995-05-01), Hua et al.
patent: 5486752 (1996-01-01), Hua et al.
patent: 5726869 (1998-03-01), Yamashita et al.
patent: 5736842 (1998-04-01), Jovanovic
Robert Streit and Daniel Tollik, "High Efficiency Telecom Rectifier Using A Novel Soft-Switched Boost-Based Input Current Shaper" INTELEC '91, Nov. 1991, pp. 720-726.
Guichao Hua, Ching-Shan Leu, and Fred C. Lee, "Novel Zero-Voltag-Transition PWM Converters" IEEE, Mar. 1992, pp. 55-61.
John A. Bassett, "New, Zero Voltage Switching, High Frequency Boost Converter Topology for Power Factor Correction" IEEE, 1995, pp. 813-820.
Claudio M. Duarte and Ivo Barbi, "A New Family Of ZVS-PWM Active-Clamping DC-To-DC Boost Converters: Analysis, Design, And Experimentation" IEEE, 1996, pp. 305-312.
Milan M. Jovanovic, "A Technique For Reducing Rectifier Reverse-Recovery-Related Losses In High-Voltage, High-Power Boost Converters" IEEE, 1997, pp. 1000-1007.
Koosuke Harada and Hiroshi Sakamoto, "Switched Snubber for High Frequency Switching" IEEE, 1990, pp. 181-188.

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