Current-Fed Phase-Shifted Full-Bridge Converter with Secondary Harmonic Current Reduction for Two-Stage Inverter in Energy Storage System
For the low voltage, high current, isolated DC-DC converter applications, current-fed type converter has the chance to achieve higher efficiency due to the lower transformer root mean square current compared with other well-known converters such as dual active bridge or LLC. A current-fed phase-shif...
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| Published in | IEEE transactions on power electronics Vol. 38; no. 9; pp. 1 - 12 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
New York
IEEE
01.09.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0885-8993 1941-0107 |
| DOI | 10.1109/TPEL.2023.3282911 |
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| Abstract | For the low voltage, high current, isolated DC-DC converter applications, current-fed type converter has the chance to achieve higher efficiency due to the lower transformer root mean square current compared with other well-known converters such as dual active bridge or LLC. A current-fed phase-shifted full-bridge, CFPSFB converter has the advantages of nearly full range zero-voltage-switching and soft-commutating without large size of passive or active snubber circuit because the phase-shift of secondary full-bridge is controlled to be proportional to the input current. However, as a front-end stage of a single phase inverter, the input secondary harmonic current (SHC) propagating from the output AC load may cause large voltage spike to damage the primary MOSFETs due to losing the soft-commutating property. SHC may also reduce the conversion efficiency and the lifespan of battery intensely. This paper proposes a simple control scheme based on virtual series impedance method with a notch filter in control loop to reduce the SHC and maintain good dynamic performance. A small-signal model of CFPSFB for a reliable controller design is derived and verified by simulation. A 48 V/3 kW maximum output power inverter prototype is built to verify the theoretical analysis. The maximum efficiency of the DC-DC stage is 97.4% and the peak to peak SHC is less than 10% of the average input current. |
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| AbstractList | For the low voltage, high current, isolated dc–dc converter applications, current-fed type converter has the chance to achieve higher efficiency due to the lower transformer root mean square current compared with other well-known converters such as dual active bridge or LLC. A current-fed phase-shifted full-bridge (CFPSFB) converter has the advantages of nearly full range zero-voltage-switching and soft-commutating without large size of passive or active snubber circuit because the phase-shift of secondary full-bridge is controlled to be proportional to the input current. However, as a front-end stage of a single phase inverter, the input secondary harmonic current (SHC) propagating from the output ac load may cause large voltage spike to damage the primary mosfet s due to losing the soft-commutating property. SHC may also reduce the conversion efficiency and the lifespan of battery intensely. This article proposes a simple control scheme based on virtual series impedance method with a notch filter in control loop to reduce the SHC and maintain good dynamic performance. A small-signal model of CFPSFB for a reliable controller design is derived and verified by simulation. A 48 V/3 kW maximum output power inverter prototype is built to verify the theoretical analysis. The maximum efficiency of the dc–dc stage is 97.4% and the peak to peak SHC is less than 10% of the average input current. For the low voltage, high current, isolated DC-DC converter applications, current-fed type converter has the chance to achieve higher efficiency due to the lower transformer root mean square current compared with other well-known converters such as dual active bridge or LLC. A current-fed phase-shifted full-bridge, CFPSFB converter has the advantages of nearly full range zero-voltage-switching and soft-commutating without large size of passive or active snubber circuit because the phase-shift of secondary full-bridge is controlled to be proportional to the input current. However, as a front-end stage of a single phase inverter, the input secondary harmonic current (SHC) propagating from the output AC load may cause large voltage spike to damage the primary MOSFETs due to losing the soft-commutating property. SHC may also reduce the conversion efficiency and the lifespan of battery intensely. This paper proposes a simple control scheme based on virtual series impedance method with a notch filter in control loop to reduce the SHC and maintain good dynamic performance. A small-signal model of CFPSFB for a reliable controller design is derived and verified by simulation. A 48 V/3 kW maximum output power inverter prototype is built to verify the theoretical analysis. The maximum efficiency of the DC-DC stage is 97.4% and the peak to peak SHC is less than 10% of the average input current. |
| Author | Wang, Guan-Chi Chiu, Huang-Jen Huang, Ta-Wei Chang, Yu-Chen |
| Author_xml | – sequence: 1 givenname: Ta-Wei surname: Huang fullname: Huang, Ta-Wei organization: Dept. of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan – sequence: 2 givenname: Huang-Jen orcidid: 0000-0002-7638-0025 surname: Chiu fullname: Chiu, Huang-Jen organization: Dept. of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan – sequence: 3 givenname: Guan-Chi surname: Wang fullname: Wang, Guan-Chi organization: Dept. of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan – sequence: 4 givenname: Yu-Chen surname: Chang fullname: Chang, Yu-Chen organization: Dept. of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan |
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| Snippet | For the low voltage, high current, isolated DC-DC converter applications, current-fed type converter has the chance to achieve higher efficiency due to the... For the low voltage, high current, isolated dc–dc converter applications, current-fed type converter has the chance to achieve higher efficiency due to the... |
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| SubjectTerms | Batteries Circuits Control systems design Current-fed full bridge Efficiency Electric bridges Electric converters Energy storage Impedance method Inductors Inverters Low voltage MOSFET Notch filters phase-shift control Power generation second harmonic current small signal model soft switching soft-commutating Switches virtual impedance Voltage control |
| Title | Current-Fed Phase-Shifted Full-Bridge Converter with Secondary Harmonic Current Reduction for Two-Stage Inverter in Energy Storage System |
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