A 250 kHz/560 W phase modulated converter

Abstract

Private ore 560012 INDIA Bangalo~ 560012 INDLA Bangalore 560012 c h a~c t e r i~c s of this new topology are discussed in 1 and design procedures for each of these c o~~n e n t s am developed. The concept of ZVS LIlMllT is introdaced The various trade-offs involved in the 2% Hiz off-iine SMPS, using the phase mod~ation concept is designed and developed. The

Analysis, Design, and Experimental Results of the Semidual-Active-Bridge Converter

“…DISCUSSION AND POSSIBLE IMPROVEMENT TO S-DAB Among the popular isolated converters for unidirectional power flow applications, the phase-shift controlled full-bridge [18], [19] offers ZVS but with a restricted load range and requires large filter inductors. The series resonant converters [20], [21] require variable frequency operation with corresponding disadvantages such as larger filters designed for the lowest frequency of operation.…”

“…There are numerous unidirectional power flow applications including various types of dc power supplies, dc-dc stage of different types of photovoltaic (PV) inverters, battery chargers in electric vehicles, and other applications where the discharging is not through the same converter, and power converters for fuel-cell applications. Some of the popular topologies for the high-power, isolated dc-dc converters include the phase-shift controlled full-bridge converter [18], [19] series resonant converters [20], [21] and isolated boost especially for PV converters [22] (which are compared with the proposed topology in Section IV).…”

Novel soft-switching DC-DC converter with full ZVS-range and reduced filter requirement. I. Regulated-output applications

“…The left-leg transition begins when is turned off. In conventional PMC, as soon as is turned off, the transformer voltage becomes negative and the reflected load current begins to fall resonantly [4]. In the new configuration, the transformer voltage of the half-bridge section still remains positive, and the sum of the two secondary voltages becomes negative only when the voltage across , ( ) reaches given by…”

“…Its main attractive features are zero-voltage turn-on switching (ZVS), constant switching frequency and simple control similar to that of the hard-switched full-bridge PWM converter. The main disadvantage of the phase-modulated converter is that achieving ZVS below, for example, one-half load is at the expense of significant increase in the conduction losses [4].…”

“…Therefore, the energy available for charging/discharging the switch capacitance is less, and hence, achieving ZVS for the left-leg switches is more difficult. The energy available is a function of the load current, and at light-loads ZVS is lost [1]- [4].…”