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Decoupled PWM Plus Phase-Shift Control for a Dual-Half-Bridge Bidirectional DC–DC Converter.
- Source :
-
IEEE Transactions on Power Electronics . Aug2018, Vol. 33 Issue 8, p7203-7213. 11p. - Publication Year :
- 2018
-
Abstract
- This paper presents the analysis of low leakage inductance current regions, small-signal model, and decoupled control for a dual-half-bridge isolated bidirectional dc–dc converter with pulse width modulation plus phase-shift strategy. Traditionally, the duty cycle of the transistors is fixed at 0.5 and only the phase-shift is varied to regulate the output voltage. With PPS control, two control freedoms—the duty cycle is used to regulate the voltage gain and phase-shift is used to control the power flow—can be obtained to expand input-voltage variation range. In addition, since the amplitude of leakage inductance current is limited, the current stresses of transistors can be reduced. According to the analysis, there exists a region in which higher leakage inductance current leads to lower output power and thus, causes more conduction loss. Attention should be paid to avoid this operation region. Then, a small-signal model is derived in the low conduction loss region with the state space averaging method to facilitate the closed-loop design. In addition, a decoupled control strategy is proposed to eliminate the interactions between phase-shift ratio and duty cycle, so as to simplify the proportional-integral controller design significantly. A prototype was built to verify the theoretical analysis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 33
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 129455444
- Full Text :
- https://doi.org/10.1109/TPEL.2017.2758398