Abstract
This paper proposes optimized control methods for global minimum backflow power based on a triple-phase-shift (TPS) control strategy. Three global optimized methods are derived to minimize the backflow power on the primary side, on the secondary side and on both sides, respectively. Backflow power transmission is just a portion of non-active power transmission in a dual active bridge (DAB) converter. Non-active power transmission time is proposed in this paper, which unifies zero power transmission and backflow power transmission. Based on the proposed index, an optimized control method is derived to achieve both the maximum effective power transmission time and minimum current stress of DAB at the same time. A comparative analysis is performed to show the limitations of the minimum backflow power optimization method. Finally, a prototype is built to verify the effectiveness of our theoretical analysis and the proposed control methods by experimental results.
Highlights
In recent years, dual active bridge (DAB) dc-dc converter is an attractive application with the advantages of bidirectional power flow, electrical isolation, high power density, and high transfer efficiency
GMBPC is still is still effective to improve the performance when d is far effective to improve the performance of DAB of when d is far from
1/d, the expressions of of GMBPC is introduced
Summary
Dual active bridge (DAB) dc-dc converter is an attractive application with the advantages of bidirectional power flow, electrical isolation, high power density, and high transfer efficiency. The traditional single-phase-shift (SPS) control method [2] only uses one degree of freedom of DAB. SPS control is easy to implement on-chip. SPS control only provides high operation efficiency when the voltage conversion ratio d is close to 1. The current stress and current rms for SPS control will increase a lot and the range of soft-switching will decrease when the voltage conversion ratio d is far from 1. SPS control is not highly efficient under wide voltage variation conditions
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