Backflow Power Optimization of DAB Based on Asymmetric Duty Cycle and Internal Phase Shift Control

Abstract

Dual active bridge (DAB) converter with single-phase-shifting (SPS) control would produce large backflow power when voltage regulation ratio deviates from 1 or under light load, an asymmetric duty cycle and internal phase shift (ADIPS) control was proposed which controls the transmission power by duty cycle and internal phase-shift ratio and the backflow power can be eliminated under light load therefore improves the efficiency of DAB converter. By establishing mathematical models of inductor current and transmission power, the working principle of the proposed control method was given as well as the cause of backflow power was analyzed. The constraints of zero backflow power and an optimization control method of zero backflow power under ADIPS control was presented. At last, an experimental prototype is used to obtain the validation results, simulation and experimental results verify the excellent performance of the proposed control strategy in eliminating the backflow power of DAB converter under light load.

Efficiency and dynamic characteristics of improved dual‐stage power converter setup with advanced model predictive controller for electric vehicle battery charging

“…Thereafter, a resonant is established among the L m and C P of the lagging-legs switches, S P3 and S P4 . Lastly, I PR t ð Þ and the drain-to-source volt of lagging-legs switches, V ds,SP3 t ð Þ, and V ds,SP4 t ð Þ are observed in Equations (29), (30), and (31). Once the filtering elements L Rf and C Rf have been put in place, the current will flow steadily through the given load of R load and C load .…”

A Collaborative Modulation Method of Dual-Side Backflow Power Optimization and Zero-Voltage Switching for Dual Active Bridge

“…In addition, asymmetric phase-shift modulation with a non-50% duty cycle of the drive signals has been used to increase the degree of freedom of DAB control [25]. In [26], an asymmetric duty cycle and internal phase-shift modulation method is proposed to eliminate the backflow power at a light load. However, it does not optimize the dualside backflow power over the full operation range and does not consider the ZVS.…”