Application of advanced control theory to power …...The work we do at our laboratory to explore...
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89 OPAL-RING Summary of Research High-Speed High-Functionality Digital Switching Technologies Attract Industry Attention The work we do at our laboratory to explore the application of advanced control theory to power electronics has applications to advanced digital control, including the digital control of switches, motors, actuators, and filters. We have drawn especially keen industry interest for our research on highly robust advanced digital control tech- nologies using a digital signal processor (DSP). At this time, virtually all commercially available switching power supplies have analog controls. But DSPs that had been extremely costly until recently are now becoming available at affordable prices. In response to this trend, we have developed a technology that will allow the implemen- tation of advanced digital control algorithms to DSP. In addition to giving switching devices excellent start-up response, this technology will allow switching devices to perform various tasks, such as current estimation, load variation estimates, bumpless voltage and current mode switching, and protection for whole systems. Joint Research Currently Underway with Three Manufacturers In partnership with a power supply manufacturer (Company A) and switching regula- tor manufacturer (Company B), we have undertaken a joint study to realize a highly robust broadband DC-AC power supply based on the implementation of advanced digital control in DSP. We are also in the process of proposing the application of ad- vanced digital control to 1-bit digital filters using ΔΣ convolution to an audio equip- ment manufacturer (Company C). We previously held a consignment contract with Company B for consulting in the area of switching power supply and digital control technologies through Campus Create Co., Ltd., the technology licensing organization (TLO) of the University of Electro-Communications. Established under the Act on the Promotion of Technology Transfer from Universities to Private Business Operators, the TLO is an intermediary organization whose purpose is to transfer the results of research at universities and research institutes to industry. In addition to our R&D on leading-edge technologies, the work pursued by our laboratory make us leaders at UEC for industry/academia partnerships. Advantages Validating Our Original Digital Feedback Theory Through Tests on Actual Systems Our most significant research advantage is the adoption of an original method called the approximate 2-degree-of-freedom integral-type digital controller for digital control design. This method treats load and source voltage changes as changes in the pa- rameters of a control object in a discrete time system and calculates the correspond- ing equivalent input disturbance for changes in the parameters. In addition, we also adopt a unique idea conceived at our laboratory: the bumpless switching method, whereby multiple controllers are utilized in a bumpless condi- tion for cases where the range of loads is extremely wide. What makes our labora- tory unique is our constant creation and validation of actual systems based on new ideas, followed by efforts to fine tune these systems through partnerships with com- mercial entities, ultimately producing technologies with high promise for real-world applications. Application of advanced control theory to power electronics Kohji HIGUCHI Laboratory Kohji HIGUCHI http://www.powercon.ee.uec.ac.jp/ Robust control, digital control, switching regulator, DSP, digital signal processor, power electronics Affiliations Society of Instrument and Control Engineers; Institute of Electrical Engineers of Japan; Institute of Electronics, Information and Communication Engineers; Institute of Electrical and Electronics Engineers (IEEE) Member Kohji Higuchi, Associate professor Tatsuyoshi Kajikawa, Academic engineering services Keywords
Transcript of Application of advanced control theory to power …...The work we do at our laboratory to explore...
89OPAL-RING
Summary of Research
High-Speed High-Functionality Digital Switching Technologies Attract Industry Attention
The work we do at our laboratory to explore the application of advanced control theory to power electronics has applications to advanced digital control, including the digital control of switches, motors, actuators, and filters. We have drawn especially keen industry interest for our research on highly robust advanced digital control tech-nologies using a digital signal processor (DSP). At this time, virtually all commercially available switching power supplies have analog controls. But DSPs that had been extremely costly until recently are now becoming available at affordable prices. In response to this trend, we have developed a technology that will allow the implemen-tation of advanced digital control algorithms to DSP. In addition to giving switching devices excellent start-up response, this technology will allow switching devices to perform various tasks, such as current estimation, load variation estimates, bumpless voltage and current mode switching, and protection for whole systems.Joint Research Currently Underway with Three ManufacturersIn partnership with a power supply manufacturer (Company A) and switching regula-tor manufacturer (Company B), we have undertaken a joint study to realize a highly robust broadband DC-AC power supply based on the implementation of advanced digital control in DSP. We are also in the process of proposing the application of ad-vanced digital control to 1-bit digital filters using ΔΣ convolution to an audio equip-ment manufacturer (Company C).We previously held a consignment contract with Company B for consulting in the area of switching power supply and digital control technologies through Campus Create Co., Ltd., the technology licensing organization (TLO) of the University of Electro-Communications. Established under the Act on the Promotion of Technology Transfer from Universities to Private Business Operators, the TLO is an intermediary organization whose purpose is to transfer the results of research at universities and research institutes to industry. In addition to our R&D on leading-edge technologies, the work pursued by our laboratory make us leaders at UEC for industry/academia partnerships.
Advantages
Validating Our Original Digital Feedback Theory Through Tests on Actual Systems
Our most significant research advantage is the adoption of an original method called the approximate 2-degree-of-freedom integral-type digital controller for digital control design. This method treats load and source voltage changes as changes in the pa-rameters of a control object in a discrete time system and calculates the correspond-ing equivalent input disturbance for changes in the parameters.In addition, we also adopt a unique idea conceived at our laboratory: the bumpless switching method, whereby multiple controllers are utilized in a bumpless condi-tion for cases where the range of loads is extremely wide. What makes our labora-tory unique is our constant creation and validation of actual systems based on new ideas, followed by efforts to fine tune these systems through partnerships with com-mercial entities, ultimately producing technologies with high promise for real-world applications.
Application of advanced control theory to power electronics
Kohji HIGUCHI Laboratory
Kohji HIGUCHI
http://www.powercon.ee.uec.ac.jp/
Robust control, digital control, switching regulator, DSP, digital signal processor, power electronics
Affiliations
Society of Instrument and Control Engineers; Institute of Electrical Engineers of Japan; Institute of Electronics, Information and Communication Engineers; Institute of Electrical and Electronics Engineers (IEEE)
MemberKohji Higuchi, Associate professorTatsuyoshi Kajikawa, Academic engineering services
Keywords
90 OPAL-RING
Future Prospects
Dramatic Growth in Demand for Digitally-Controlled Switching Power Supply
In the near future, we expect rapid growth in demand for high-functionality power supplies, including those represented by power supplies for communication devices, and for high power supplies exceeding 1 kilowatt. Additionally, the cost of DSPs is likely to continue falling, undoubtedly leading to greater de-mand for high-functionality digital switching power supplies based on DSP.Monitoring these trends, our laboratory began research on digital switching control based on DSP quite early. The theories and technologies generated by our research efforts are certain to be the center of attention from various industry sectors.
Manufacturing Technology
DC-AC-implemented digital control system
DSP-implemented digital controller (no. 3)
DSP-implemented digital controller (no. 1) DSP
DSP-implemented digital controller (no. 2)
