Current Stress Minimization of Dual-Active-Bridge DC–DC Converter Within the Whole Operating Range

Overview and Comparison of Modulation and Control Strategies for a Nonresonant Single-Phase Dual-Active-Bridge DC–DC Converter

“…Therefore, to boost the efficiency of an NSDAB dcdc converter, current-stress-optimized (CSO) strategies with the EPS and DPS modulation schemes are proposed in [31] and [73]. Furthermore, based on the TPS modulation method, minimum CSO (MCSO) strategies are proposed to boost the efficiency of an NSDAB dc-dc converter with simple operations [33], [58], [74], and the adopted phase-shift modes can be shown in Fig. 24, where both ZCS and ZVS performance can be guaranteed [58].…”

“…When both side voltages are matched, the SPS modulation method will be the best choice for the NSDAB dc-dc converter [31], [33], [48], [58], [73], [74]. However, when the input side and output side voltages are mismatched, there are four approaches to boost the efficiency of an NSDAB dc-dc converter, including the power-loss-model-based optimization schemes [17], [35], [59], nonactive power optimization methods [30], [64], [67], ZVS range optimization strategies [36], [75], and inductance current optimization techniques [33], [34], [48], [58], [74]. The advantages and disadvantages of each efficiencyimproving scheme are summarized in Table II.…”

“…Therefore, the inductance current optimization technique is recommended to reduce the power loss and to improve the efficiency for an NSDAB dc-dc converter, and this is also the most popular method for boosting the efficiency of an NSDAB dc-dc converter [31], [33], [34], [40], [48], [58], [73], [74]. Generally, the inductance current optimization technique is divided into the rms current optimization scheme [34], [48] and the CSO strategy [31], [33], [73], [74]. As analyzed in Section II-F, the SPS, DPS, and EPS modulation methods can be regarded as a special case of the TPS modulation method, so the TPS modulation method can always provide the best efficiency for an NSDAB dc-dc converter [33], [56], [58].…”

“…As analyzed in Section II-F, the SPS, DPS, and EPS modulation methods can be regarded as a special case of the TPS modulation method, so the TPS modulation method can always provide the best efficiency for an NSDAB dc-dc converter [33], [56], [58]. Therefore, based on the TPS modulation method, the MRMSC [34], [48] strategy and the MCSO [33], [58], [74] scheme will be compared in detail.…”

“…In addition, the optimized solutions, which are based on the phase-shift-ratio positions in Fig. 10, of the MRMSC [34], [48] strategy and the MCSO [33], [58], [74] can be given in Tables III and IV, respectively. However, under the MRMSC scheme, D 1 , D 2 , and D 3 cannot be calculated by p directly for medium-load condition since the relationship among the phase-shift ratios D 1 , D 2 , and D 3 is nonlinear [34], [48].…”