TY - JOUR
T1 - Novel soft switching DC-DC converter with full ZVS-range and reduced filter requirement - Part I
T2 - Regulated-output applications
AU - Ayyanar, Rajapandian
AU - Mohan, Ned
PY - 2001/3
Y1 - 2001/3
N2 - A novel soft-switching topology for dc-dc converters is proposed. It is well suited for applications in the range of a few hundred watts to a few kilowatts. It is essentially a hybrid combination of an uncontrolled half-bridge section and a phase-shift controlled full-bridge section, realized with just four switches. The main features of the proposed topology are zero-voltage-switching down to no-load without serious conduction loss penalty, constant frequency operation and near-ideal filter waveforms. The improved filter waveforms result in significant savings in the input and output filter requirement, resulting in high power-density. The new topology requires two transformers and two dc-bypass capacitors. The combined VA rating of the two transformers is more than that of the single transformer of conventional full-bridge converters, for variable-input applications. In Part I of the paper, the converter operation is analyzed for typical switch-mode power supply applications, where the input voltage varies widely but the output voltage is fixed and is well regulated. Experimental results obtained from a 100-W/200-kHz proof-of-concept prototype confirm the superior features of the proposed hybrid configuration.
AB - A novel soft-switching topology for dc-dc converters is proposed. It is well suited for applications in the range of a few hundred watts to a few kilowatts. It is essentially a hybrid combination of an uncontrolled half-bridge section and a phase-shift controlled full-bridge section, realized with just four switches. The main features of the proposed topology are zero-voltage-switching down to no-load without serious conduction loss penalty, constant frequency operation and near-ideal filter waveforms. The improved filter waveforms result in significant savings in the input and output filter requirement, resulting in high power-density. The new topology requires two transformers and two dc-bypass capacitors. The combined VA rating of the two transformers is more than that of the single transformer of conventional full-bridge converters, for variable-input applications. In Part I of the paper, the converter operation is analyzed for typical switch-mode power supply applications, where the input voltage varies widely but the output voltage is fixed and is well regulated. Experimental results obtained from a 100-W/200-kHz proof-of-concept prototype confirm the superior features of the proposed hybrid configuration.
KW - DC-DC converters
KW - Hybrid converters
KW - Phase-shifted full-bridge
KW - Zero-voltage-switching
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U2 - 10.1109/63.911142
DO - 10.1109/63.911142
M3 - Article
AN - SCOPUS:0035278767
SN - 0885-8993
VL - 16
SP - 184
EP - 192
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 2
ER -