Lossless active snubber for half-bridge output rectifiers

Details Lossless active snubber for half-bridge output rectifiers Lossless active snubber for half-bridge output rectifiers

1993-03-05

1994-09-27

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 17, 363126, H02M 706

Patent

active

053511794

ABSTRACT:
A bridge-type primary switching circuit (12) is represented by a pulsed voltage source (VSW). The primary switched waveform is transformed to secondary circuit (14) using a transformer (T1) with the required turns ratio N and a center-tapped secondary winding (16). Half-bridge rectifier (18) formed by diodes (DR1) and (DR2) rectifies the secondary waveform and feeds the waveform through a low-pass filter (LF) and (CF) to obtain the desired DC output voltage. The snubber circuit (20) is represented by switch-diode-capacitor combinations (SA-DS1-CS1) and (SB-DS2-CS2) across each rectifier (DR1) and (DR2). Capacitances (CS1) and (CS2) are selected large enough such that their voltages remain essentially constant during a switching cycle. The controlled switches (SA) and (SB) are turned ON with a specific delay after the primary voltage reaches a magnitude close to the input voltage in order to allow the rectifier diodes (DR1) and (DR2) to be commutated. It is crucial that the switches (SA) and (SB) be turned OFF before the primary voltage collapses to zero to avoid current spikes through the switches.

REFERENCES:
patent: 4441146 (1984-04-01), Vinciarelli
patent: 5140509 (1992-08-01), Murugan
patent: 5255174 (1993-10-01), Murugan
Loweday H. Mweene et al., "A 1 kW, 500 kHz Front-End Converter for a Distributed Power Supply System," IEEE, Mass. Institute of Tech., CH2719, pp. 423-432, Mar. 1989.
J. A. Sabate et al., "High-Voltage, High-Power, ZVS, Full-Bridge PWM Converter Employing an Active Snubber," IEEE, VA Polyt. Inst., CH2992, pp. 158-163, Jun. 1991.
Koosuke Harada et al., "Switched Snubber for High Frequency Switching," IEEE, Kyushu University, CH2873, pp. 181-188, Aug. 1990.
Bruce Carsten, "Design Techniques for Transformer Active Reset Circuits at High Frequencies and Power Levels," Proceedings, HFPC, pp. 235-246, May 1990.

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