Abstract
In this paper, a dual-bridge DC/DC resonant converter with a generalized series and parallel resonant tank is analyzed. A general approach based on Fundamental Harmonic Approximation is used to find the universal steady-state solutions. The analysis results for particular resonant tank configurations are exemplified with several typical resonant tank configurations respectively. The corresponded soft-switching conditions are discussed too. To illustrate the usefulness of the generalized approach, a dual-bridge (LC)(L)-type resonant converter working in below resonance mode is designed based on the analysis results. Finally, simulation and experimental plots of the design example are included to evaluate the validity and the accuracy of the proposed analysis approach.
Highlights
Since its introduction several decades ago, resonant DC/DC converters have drawn much attention from both industrial engineers [1] and academic researchers [2,3,4,5,6,7,8,9] and have been used in real applications such as consumer electronics products and distribution generation
The analysis results for several particular configurations of resonant tank that were studied frequently in the literature are discussed individually
Soft-switching condition can be checked by means of the switch currents in each of the two bridges
Summary
Since its introduction several decades ago, resonant DC/DC converters have drawn much attention from both industrial engineers [1] and academic researchers [2,3,4,5,6,7,8,9] and have been used in real applications such as consumer electronics products and distribution generation. Different arrangements of resonant tank have been examined to create nearly sinusoidal waveforms and soft switching operation, which in Energies 2014, 7 turn enable higher switching frequency and small converter size. Two main control methods, varying frequency and fixed frequency phase-shift control, could be used to control power flow [1,2,3,4,5,6,7]. Zero-Voltage Switching (ZVS) in varying frequency control, above resonance or lagging mode operation is preferred with the switching frequency higher than the resonance frequency. Fixed frequency control of resonant converters, i.e., the so-called phase-shift control, which is limited to full-bridge type resonant converter, suffers from asymmetric switching behavior in two switch legs. Half of the main switches may lose ZVS at light load
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