{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/125184"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/125184","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Investigation of Modular CLLC DC/DC Converter using Bypass Control for Wide Output Voltage Regulation","abstract":"With the recent emerging demands in power electronics and electric grid of the future, resonant converters like CLLC converter are gaining popularity in applications like dc microgrids because of their advantages like high efficiency and bidirectional operation capability. However, one limitation of such converters is their limited voltage range which makes it hard to interface wide output voltage range loads like electric vehicle charging. Using additional power conversion stages solves this issue but it comes with added cost and reduced efficiency. This paper proposes a novel converter topology referred to as modular partial power architecture that has reduced power conversion stages and a novel bypass control strategy which allows it to have wide voltage range. Using the bypass control method, full voltage range of 0-100% is possible with bidirectional power flow by bypassing or turning on the modules based on voltage requirement. The detailed design considerations for this converter have been analyzed for a specific design case, and it is shown that the device losses can be reduced by up to 60% at full load. The working of the converter and the control strategy have been verified both in simulation and hardware.","abstract_html":"With the recent emerging demands in power electronics and electric grid of the future, resonant converters like CLLC converter are gaining popularity in applications like dc microgrids because of their advantages like high efficiency and bidirectional operation capability. However, one limitation of such converters is their limited voltage range which makes it hard to interface wide output voltage range loads like electric vehicle charging. Using additional power conversion stages solves this issue but it comes with added cost and reduced efficiency. This paper proposes a novel converter topology referred to as modular partial power architecture that has reduced power conversion stages and a novel bypass control strategy which allows it to have wide voltage range. Using the bypass control method, full voltage range of 0-100% is possible with bidirectional power flow by bypassing or turning on the modules based on voltage requirement. The detailed design considerations for this converter have been analyzed for a specific design case, and it is shown that the device losses can be reduced by up to 60% at full load. The working of the converter and the control strategy have been verified both in simulation and hardware.","abstract_has_math":false,"creators":["Sathri, Jaswanth Daniel"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Electrical Engineering","degree_department":"Electrical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Dong, Dong"],"committee_members":["Lu, Guo Quan","Burgos, Rolando"],"year":2025,"date_issued":"2025-04-14","date_published":"2025-04-14","updated_at":"2026-07-22T22:18:44Z","subjects":["CLLC Converter","Modular Converter","Zero Voltage Switching (ZVS)"],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["vt_gsexam:42767"],"render_values":[{"text":"vt_gsexam:42767","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/10919/125184","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Dong, Dong"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Lu, Guo Quan","Burgos, Rolando"]},{"key":"dc:contributor.department","label":"Department","values":["Electrical Engineering"]},{"key":"dc:creator","label":"Author","values":["Sathri, Jaswanth Daniel"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-04-15T08:00:18Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-04-15T08:00:18Z"]},{"key":"dc:date.issued","label":"Date","values":["2025-04-14"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["CLLC Converter","Modular Converter","Zero Voltage Switching (ZVS)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["vt_gsexam:42767"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10919/125184"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["With the recent emerging demands in power electronics and electric grid of the future, resonant converters like CLLC converter are gaining popularity in applications like dc microgrids because of their advantages like high efficiency and bidirectional operation capability. However, one limitation of such converters is their limited voltage range which makes it hard to interface wide output voltage range loads like electric vehicle charging. Using additional power conversion stages solves this issue but it comes with added cost and reduced efficiency. This paper proposes a novel converter topology referred to as modular partial power architecture that has reduced power conversion stages and a novel bypass control strategy which allows it to have wide voltage range. Using the bypass control method, full voltage range of 0-100% is possible with bidirectional power flow by bypassing or turning on the modules based on voltage requirement. The detailed design considerations for this converter have been analyzed for a specific design case, and it is shown that the device losses can be reduced by up to 60% at full load. The working of the converter and the control strategy have been verified both in simulation and hardware."]},{"key":"dc:description.abstractgeneral","label":"General Abstract","values":["DC microgrids integrate various distributed energy resources, energy storage systems, and loads, each with unique voltage characteristics. Wide voltage range DC/DC converters are essential for interfacing these diverse components, ensuring optimal power flow and system stability. These converters must efficiently handle voltage variations from low-voltage sources like solar panels to higher DC bus voltages while maintaining high efficiency and power quality. In EV charging applications, wide voltage range converters are crucial for accommodating different battery voltages and charging protocols. As EV battery voltages continue to increase, with some systems now operating at 800 V or higher, charging infrastructure must adapt to support a broad spectrum of vehicle models. Fast-charging systems require high-power converters capable of efficiently managing large voltage and current variations. Wide voltage range DC/DC converters offer several advantages in these applications, including improved system flexibility, reduced conversion stages, and enhanced overall efficiency. This work underscores the importance of continued research and development in wide voltage range DC/DC power electronic converters to support the growing demands of DC microgrids and EV charging infrastructure and provides a unique solution for such applications based on partial power processing."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["ETD"]},{"key":"dc:title","label":"Title","values":["Investigation of Modular CLLC DC/DC Converter using Bypass Control for Wide Output Voltage Regulation"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Dong, Dong"],"dc:contributor.committeemember":["Lu, Guo Quan","Burgos, Rolando"],"dc:contributor.department":["Electrical Engineering"],"dc:creator":["Sathri, Jaswanth Daniel"],"dc:date.accessioned":["2025-04-15T08:00:18Z"],"dc:date.available":["2025-04-15T08:00:18Z"],"dc:date.issued":["2025-04-14"],"dc:description.abstract":["With the recent emerging demands in power electronics and electric grid of the future, resonant converters like CLLC converter are gaining popularity in applications like dc microgrids because of their advantages like high efficiency and bidirectional operation capability. However, one limitation of such converters is their limited voltage range which makes it hard to interface wide output voltage range loads like electric vehicle charging. Using additional power conversion stages solves this issue but it comes with added cost and reduced efficiency. This paper proposes a novel converter topology referred to as modular partial power architecture that has reduced power conversion stages and a novel bypass control strategy which allows it to have wide voltage range. Using the bypass control method, full voltage range of 0-100% is possible with bidirectional power flow by bypassing or turning on the modules based on voltage requirement. The detailed design considerations for this converter have been analyzed for a specific design case, and it is shown that the device losses can be reduced by up to 60% at full load. The working of the converter and the control strategy have been verified both in simulation and hardware."],"dc:description.abstractgeneral":["DC microgrids integrate various distributed energy resources, energy storage systems, and loads, each with unique voltage characteristics. Wide voltage range DC/DC converters are essential for interfacing these diverse components, ensuring optimal power flow and system stability. These converters must efficiently handle voltage variations from low-voltage sources like solar panels to higher DC bus voltages while maintaining high efficiency and power quality. In EV charging applications, wide voltage range converters are crucial for accommodating different battery voltages and charging protocols. As EV battery voltages continue to increase, with some systems now operating at 800 V or higher, charging infrastructure must adapt to support a broad spectrum of vehicle models. Fast-charging systems require high-power converters capable of efficiently managing large voltage and current variations. Wide voltage range DC/DC converters offer several advantages in these applications, including improved system flexibility, reduced conversion stages, and enhanced overall efficiency. This work underscores the importance of continued research and development in wide voltage range DC/DC power electronic converters to support the growing demands of DC microgrids and EV charging infrastructure and provides a unique solution for such applications based on partial power processing."],"dc:description.degree":["Master of Science"],"dc:format.medium":["ETD"],"dc:identifier.other":["vt_gsexam:42767"],"dc:identifier.uri":["https://hdl.handle.net/10919/125184"],"dc:language.iso":["en"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["CLLC Converter","Modular Converter","Zero Voltage Switching (ZVS)"],"dc:title":["Investigation of Modular CLLC DC/DC Converter using Bypass Control for Wide Output Voltage Regulation"],"dc:type":["Thesis"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:18:44Z"}