Abstract
In this paper, a semi-dual-active-bridge (S-DAB) DC/DC converter with primary pulse-width modulation plus secondary phase-shifted (PPWM + SPS) control for boost conversion is analyzed in detail. Under the new control scheme, all effective operation modes are identified at first. Then, the working principle, switching behaviour, and operation range in each mode are discussed. Compared with conventional secondary phase-shifted control, PPWM + SPS control with two controllable phase-shift angles can extend the zero-voltage switching (ZVS) range and enhance control flexibility. In addition, an effective control route is also given that can make the converter achieve at the global minimum root-mean-square (RMS) current across the whole power range and avoid the voltage ringing on the transformer secondary-side at a light load. Finally, a 200 W prototype circuit is built and tested to verify correctness and effectiveness of theoretical results.
Highlights
With the development of modern technology, there is a constant rise in energy use
A number of DC/DC converter topologies have been proposed according to the various application requirements
Considering that voltage ringing will potentially bring up system instability and damage the semiconductor devices, the control route for low power is put on the boundary line between Mode B and C
Summary
With the development of modern technology, there is a constant rise in energy use. the concerns regarding the availability of fossil energy and the associated pollution in the mining and consumption process is continuously growing too. A number of DC/DC converter topologies have been proposed according to the various application requirements In these converters, the phase-shift full-bridge converter is more attractive due to high power density, electrical isolation, easy to realize soft-switching commutation, high efficiency and low electromagnetic interference (EMI) [6–13]. In order to solve this problem, two active switches are introduced into the secondary-side rectifier of the converter, which is named the semi-dual-active-bridge (S-DAB) converter [20–22]. PPWM + SPS control is applied on an S-DAB converter for boost operation to further improve performance, which avoids the voltage ringing problem.
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