Modulation Scheme for the Bidirectional Operation of the Phase-Shift Full-Bridge Power Converter

Abstract

This paper proposes a novel modulation technique for the bidirectional operation of the Phase Shift Full Bridge (PSFB) DC/DC power converter. The forward or buck operation of this topology is well known and widely used in medium to high power DC to DC converter applications. In contrast, backward or boost operation is less typical since it exhibits large drain voltage overshoot in devices located at the secondary or current-fed side; a known problem in isolated boost converters. For that reason other topologies of symmetric configuration are preferred in bidirectional applications, like CLLC resonant converter or Dual Active Bridge (DAB). In this work, we propose a modulation technique overcoming the drain voltage overshoot of the isolated boost converter at the secondary or current-fed side, without additional components other than the ones in a standard PSFB and still achieving full or nearly full ZVS in the primary or voltage-fed side along all the load range of the converter. The proposed modulation has been tested in a bidirectional 3.3 kW PSFB with 400 V input and 54.5 V output, achieving a 98 % of peak efficiency in buck mode and 97.5 % in boost mode operation. This demonstrates that the PSFB converter may become a relatively simple and efficient topology for bidirectional DC to DC converter applications.

Design and implementation of bi-directional converter with internet of things control based reading

“…This will help for the minimization of the turn-on switching losses of the primary switches. Unlike the traditional PWM that operates in hard switching mode and many injected harmonics leads to a significant reduction of power [18], [19]. Therefore, the phase-shifted full bridge is more suitable for high frequency and power applications [20].…”

Design of High-Frequency ZVS Full-Bridge Power Converter for Photovoltaic Applications

“…When the capacitance C 1 is completely released from V in to 0, its device diode D 1 will be in the mode of zero voltage due to the switch S 1 solving problems of loss in switch devices. In this part, the secondary voltage of the high-frequency transformer returns to zero, and in the rectifier circuit D 2 , and D 3 are in current condition [25].…”

Non-Linear Capacitance of Si SJ MOSFETs in Resonant Zero Voltage Switching Applications

“…Because the Q was stored in C oss at a higher voltage than V DC , the initial energy in C oss was always necessarily higher than the energy that has been transferred into V supply . The rest of the energy would have been stored in the resonant inductor (15)(16).…”

“…Examples of single switch resonant or quasi-resonant topologies are the fly-back and its variants [11], and the Critical Conduction Mode (CrCM) [12] boost converter. For high-power applications are common two switch topologies, like the Transition Conduction Mode (TCM) [13] boost converter and the half-bridge LLC [14], and four switch topologies, like the Phase Shift Full Bridge (PSFB) [15], [16], the Dual Active Bridge (DAB) [17] and the full-bridge LLC. The general analysis in this work will be applied to the two basic scenarios, a single device and a half-bridge (or stacked devices), which can be conveniently extended to any of the above-mentioned topology examples.…”