Optimization of Extended Phase-Shift Control for Full-Bridge CLLC Resonant Converter With Improved Light-Load Efficiency
The capacitor-inductor-inductor-capacitor (CLLC) resonant converters are drawing more and more attention for their superiority in soft switching, wide output range, and symmetrically bidirectional operation. However, CLLC converter still suffers the problems of unsatisfactory voltage regulation and...
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| Veröffentlicht in: | IEEE transactions on power electronics 2020-10, Vol.35 (10), p.11129-11142 |
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| creator | Zhu, Tianhua Zhuo, Fang Zhao, Fangzhou Wang, Feng Yi, Hao Zhao, Tong |
| description | The capacitor-inductor-inductor-capacitor (CLLC) resonant converters are drawing more and more attention for their superiority in soft switching, wide output range, and symmetrically bidirectional operation. However, CLLC converter still suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions. Therefore, this article proposes an optimization for extended phase-shift (EPS) control in full-bridge CLLC resonant converter to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is first established to solve the voltage gain, time-domain expressions of main circuit variables, and root mean square (rms) values of resonant currents. Then, a comprehensive loss evaluation is conducted by calculating and analyzing the main power losses, including conduction loss, switching loss, and core losses of magnetic components. Besides, zero voltage switching conditions of primary and rectifier switches are derived to define the range of soft switching. Finally, based on these analyses, the optimal combination of phase-shifts for EPS control is determined to achieve the maximum conversion efficiency of full-bridge CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 18∼25 V/400 V, 200 W GaN-based CLLC resonant converter prototype. |
| doi_str_mv | 10.1109/TPEL.2020.2978419 |
| format | Article |
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However, CLLC converter still suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions. Therefore, this article proposes an optimization for extended phase-shift (EPS) control in full-bridge CLLC resonant converter to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is first established to solve the voltage gain, time-domain expressions of main circuit variables, and root mean square (rms) values of resonant currents. Then, a comprehensive loss evaluation is conducted by calculating and analyzing the main power losses, including conduction loss, switching loss, and core losses of magnetic components. Besides, zero voltage switching conditions of primary and rectifier switches are derived to define the range of soft switching. Finally, based on these analyses, the optimal combination of phase-shifts for EPS control is determined to achieve the maximum conversion efficiency of full-bridge CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 18∼25 V/400 V, 200 W GaN-based CLLC resonant converter prototype.</description><identifier>ISSN: 0885-8993</identifier><identifier>EISSN: 1941-0107</identifier><identifier>DOI: 10.1109/TPEL.2020.2978419</identifier><identifier>CODEN: ITPEE8</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Bridge circuits ; Capacitors ; Capacitor–inductor–inductor–capacitor (CLLC) resonant converter ; Circuits ; Conduction losses ; Control systems ; Converters ; Core loss ; Efficiency ; extended phase-shift (EPS) control ; light-load efficiency ; Magnetic resonance ; Optimization ; Phase shift ; Power loss ; power loss evaluation ; Rectifiers ; Resonant converters ; Switches ; Switching ; Voltage control ; Voltage gain ; Zero voltage switching</subject><ispartof>IEEE transactions on power electronics, 2020-10, Vol.35 (10), p.11129-11142</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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However, CLLC converter still suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions. Therefore, this article proposes an optimization for extended phase-shift (EPS) control in full-bridge CLLC resonant converter to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is first established to solve the voltage gain, time-domain expressions of main circuit variables, and root mean square (rms) values of resonant currents. Then, a comprehensive loss evaluation is conducted by calculating and analyzing the main power losses, including conduction loss, switching loss, and core losses of magnetic components. Besides, zero voltage switching conditions of primary and rectifier switches are derived to define the range of soft switching. Finally, based on these analyses, the optimal combination of phase-shifts for EPS control is determined to achieve the maximum conversion efficiency of full-bridge CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 18∼25 V/400 V, 200 W GaN-based CLLC resonant converter prototype.</description><subject>Bridge circuits</subject><subject>Capacitors</subject><subject>Capacitor–inductor–inductor–capacitor (CLLC) resonant converter</subject><subject>Circuits</subject><subject>Conduction losses</subject><subject>Control systems</subject><subject>Converters</subject><subject>Core loss</subject><subject>Efficiency</subject><subject>extended phase-shift (EPS) control</subject><subject>light-load efficiency</subject><subject>Magnetic resonance</subject><subject>Optimization</subject><subject>Phase shift</subject><subject>Power loss</subject><subject>power loss evaluation</subject><subject>Rectifiers</subject><subject>Resonant converters</subject><subject>Switches</subject><subject>Switching</subject><subject>Voltage control</subject><subject>Voltage gain</subject><subject>Zero voltage switching</subject><issn>0885-8993</issn><issn>1941-0107</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kMFOAjEQhhujiYg-gPHSxPNiZ7td2qNuQEk2gSjG46bsTqEEttgtBHx6FyGe5vL9_8x8hNwD6wEw9TSdDPJezGLWi1VfJqAuSAdUAhED1r8kHSaliKRS_JrcNM2SMUgEgw7ZjzfBru2PDtbV1Bk62AesK6zoZKEbjD4W1gSauTp4t6LGeTrcrlbRi7fVHGmW5xl9x8bVuv6jdugDevplw4KO1hvvdm1TbueLEOVOV3RgjC0t1uXhllwZvWrw7jy75HM4mGZvUT5-HWXPeVRynoYoTpiQRgshZzJBiayalUIYoau-AZkawbSKK84hTuOEwwxRYPs_FypBlTLBu-Tx1Nse873FJhRLt_V1u7KIW02JEpJDS8GJKr1rGo-m2Hi71v5QACuOgouj4OIouDgLbjMPp4xFxH9esbYWgP8Cn3Z2rQ</recordid><startdate>20201001</startdate><enddate>20201001</enddate><creator>Zhu, Tianhua</creator><creator>Zhuo, Fang</creator><creator>Zhao, Fangzhou</creator><creator>Wang, Feng</creator><creator>Yi, Hao</creator><creator>Zhao, Tong</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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However, CLLC converter still suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions. Therefore, this article proposes an optimization for extended phase-shift (EPS) control in full-bridge CLLC resonant converter to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is first established to solve the voltage gain, time-domain expressions of main circuit variables, and root mean square (rms) values of resonant currents. Then, a comprehensive loss evaluation is conducted by calculating and analyzing the main power losses, including conduction loss, switching loss, and core losses of magnetic components. Besides, zero voltage switching conditions of primary and rectifier switches are derived to define the range of soft switching. Finally, based on these analyses, the optimal combination of phase-shifts for EPS control is determined to achieve the maximum conversion efficiency of full-bridge CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 18∼25 V/400 V, 200 W GaN-based CLLC resonant converter prototype.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TPEL.2020.2978419</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-5070-8942</orcidid><orcidid>https://orcid.org/0000-0002-0194-9950</orcidid><orcidid>https://orcid.org/0000-0002-3682-5683</orcidid><orcidid>https://orcid.org/0000-0002-0602-7269</orcidid><orcidid>https://orcid.org/0000-0001-9006-7740</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Bridge circuits Capacitors Capacitor–inductor–inductor–capacitor (CLLC) resonant converter Circuits Conduction losses Control systems Converters Core loss Efficiency extended phase-shift (EPS) control light-load efficiency Magnetic resonance Optimization Phase shift Power loss power loss evaluation Rectifiers Resonant converters Switches Switching Voltage control Voltage gain Zero voltage switching |
| title | Optimization of Extended Phase-Shift Control for Full-Bridge CLLC Resonant Converter With Improved Light-Load Efficiency |
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