Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-11-15
1996-07-23
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363132, H02M 3335, H02M 324, H02M 75387
Patent
active
055396305
ABSTRACT:
A soft-switching dc-to-dc converter for providing regulated voltage to a load combines the functions of loss-less soft switching at zero voltage and at a constant switching frequency on the primary side and soft switching at zero current on the secondary side of an isolation transformer for all load currents from full load to no-load and PWM output voltage regulation on the secondary side. This is made possible by using voltage bidirectional switching element in series with a low-pass filter on the secondary side and current bidirectional switching element on the primary side driven at close to 50% duty ratio with adjustable dead time between switching. The adjustable dead-time is realized by sensing voltages across paired primary side current bidirectional switching element in order to enable alternate turn ON of said pair only at zero voltage, thereby eliminating or greatly reducing switching losses under all load current conditions. The output voltage is regulated by PWM control of the voltage bidirectional switching element comprising one of the following: a bipolar transistor, or a MOSFET in series with a diode, or preferably a saturable reactor in series with a diode to form a magnetic amplifier on the secondary side.
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O. Arakawa et al., "Magnetic Snubber using Amorphous Saturable Reactor-Amorphous Beads," IEEE Applied Power Electronics Conference, (IEEE Publication 88CH2504-9) pp. 334-340,1988 Record.
C. P. Henze et al., "Zero-Voltage Switching in High-Frequency Power Converters Using Pulse-Width Modulation," IEEE Applied Power Electronics Conference, (IEEE Publication 88CH2504-9) pp. 33-40, 1988 Record.
R. A. Fisher et al., "A 500kHz, 250W DC-DC Converter with Multiple Outputs Controlled by Phase-Shifted PWM and Magnetic Amplifiers," High Frequency Power Conversion Conference, pp. 100-110, 1988 Record.
Brkovic Milivoje S.
Cuk Slobodan
Pietkiewicz Andrzej
California Institute of Technology
Fernandez A. M.
Nguyen Matthew V.
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