Abstract
In this work, a unidirectional series-resonant dc/dc converter with a semi-dual-bridge structure is evaluated comprehensively. This converter can realize buck–boost conversion by means of the simple secondary phase-shifted control. With the variations of load level and converter gain, the converter may enter into different operation modes. Features of all possible operation modes and the boundary conditions among them are identified explicitly. Despite the differences between the modes, the steady-state solution for all modes with continuous resonant current could be obtained uniformly by using the fundamental harmonics approximation approach. Verifications of each operation modes are exemplified through experimental tests on a 300-W prototype converter. The measured efficiency can be maintained over 90% at low-load level when the input voltage is varied. Through comparison with reported topologies having similar structures, it is shown that this converter has lower circulation energy than a dual-bridge series-resonant converter. And the secondary arrangement of this converter is advantageous in terms of simpler driver circuit, no-risk of shoot-through fault, and low conduction loss.
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