Globally Unified ZVS and Quasi-Optimal Minimum Conduction Loss Modulation of DAB Converters

Due to the quick development of wide bandgap power devices, density converters is expected be much higher. In order increase and efficiency dual-active-bridge (DAB) converter, especially under light load, a quasi-optimal current root-mean-square (rms) control strategy achieve All-zero-voltage switching (ZVS) proposed by taking inductor rms optimization algorithm into account in this article. First, constraint conditions for realizing ZVS all devices different operating modes are concluded analyzing mode working principle DAB converter triple-phase-shift (TPS) modulation. The domain All-ZVS operation each further obtained. Then, global optimal (GOC) combined with condition derive novel modulation modes. Based on scheme, switches can improved, system load optimized. With operation, frequency raised. Finally, GaN HEMT-based prototype was built, 200 kHz, effectiveness scheme verified experimental results.