@inproceedings{GraggerHimmelstossPirker, author = {Gragger, Johannes and Himmelstoß, Felix and Pirker, Franz}, title = {Analysis and Control of a Bidirectional Two-Stage Boost Converter}, series = {Proceedings of the International Symposium on Power Electronics, Electrical Drives, Automation and Motion SPEEDAM}, booktitle = {Proceedings of the International Symposium on Power Electronics, Electrical Drives, Automation and Motion SPEEDAM}, pages = {1664 -- 1666}, subject = {Power Conversion}, language = {en} } @inproceedings{GraggerSimicHimmelstoss, author = {Gragger, Johannes and Simic, Dragan and Himmelstoß, Felix}, title = {Simulation of a battery powered air conditioning system with Modelica}, series = {Proceedings of Power Conversion and Intelligent Motion PCIM 2008}, booktitle = {Proceedings of Power Conversion and Intelligent Motion PCIM 2008}, subject = {Air Conditioning}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Efficiency Optimized, EMI-Reduced Solar Inverter Power Stage}, series = {WSEAS International conference on Circuits 2008}, booktitle = {WSEAS International conference on Circuits 2008}, pages = {96 -- 101}, subject = {Solar Power}, language = {en} } @inproceedings{NaglRafetsederFohringeretal., author = {Nagl, Bernhard and Rafetseder, Albert and Fohringer, Josef and Himmelstoß, Felix}, title = {DC-to-DC Converter Simulation Applied to a Modified Boost Converter}, series = {IEEE EUROCON 2007 - The International Conference on Computer as a Tool}, booktitle = {IEEE EUROCON 2007 - The International Conference on Computer as a Tool}, subject = {Power Conversion}, language = {en} } @inproceedings{WoehrerHofmuellerHimmelstoss, author = {W{\"o}hrer, Franz and Hofm{\"u}ller, Wilfried and Himmelstoß, Felix}, title = {Wechselrichterkippen in netzgef{\"u}hrten Stromrichterschaltungen bei Netzspannungs-Ausfall oder Netzspannungs-Einbruch und Abhilfe durch eine L{\"o}schvorrichtung}, series = {VDI-Berichte 1963}, booktitle = {VDI-Berichte 1963}, pages = {407 -- 423}, subject = {Fire Extinguisher}, language = {de} } @inproceedings{HimmelstossFohringerNagletal., author = {Himmelstoß, Felix and Fohringer, Josef and Nagl, Bernhard and Rafetseder, Albert}, title = {A new Step-Up Converter with Reduced Voltage Stress Across the Buffer Capacitor}, series = {Proceedings of the 10th International Conference on Optimization of Electrical and Electronics Equipment}, booktitle = {Proceedings of the 10th International Conference on Optimization of Electrical and Electronics Equipment}, pages = {141 -- 146}, subject = {Power Conversion}, language = {en} } @inproceedings{AuerCechHimmelstoss, author = {Auer, Markus and Cech, Michael and Himmelstoß, Felix}, title = {Modeling a Synchronous Generator with Real-Time Hardware}, series = {Proceedings of the IEEE International Symposium on Industrial Electronice ISIE}, booktitle = {Proceedings of the IEEE International Symposium on Industrial Electronice ISIE}, pages = {467 -- 472}, subject = {Generator}, language = {en} } @article{WoehrerHofmuellerHimmelstoss, author = {W{\"o}hrer, Franz and Hofm{\"u}ller, Wilfried and Himmelstoß, Felix}, title = {Sicher gel{\"o}scht - L{\"o}schvorrichtung f{\"u}r Stromrichter}, series = {Antriebstechnik}, journal = {Antriebstechnik}, number = {11}, pages = {28 -- 33}, subject = {Fire Extinguisher}, language = {de} } @inproceedings{HimmelstossWimmer, author = {Himmelstoß, Felix and Wimmer, Eduard}, title = {Bidirectional DC-DC Half-Bridge Converter with the Possibility of Zero-Voltage Switching and Reduced Current Stress of the Inductors}, series = {Proceedings of the International Conference on Power Electronics and Intelligent Control for Energy Conservation (PELINCEC 2005)}, booktitle = {Proceedings of the International Conference on Power Electronics and Intelligent Control for Energy Conservation (PELINCEC 2005)}, subject = {Power Conversion}, language = {en} } @inproceedings{WoehrerHofmuellerHimmelstoss, author = {W{\"o}hrer, Franz and Hofm{\"u}ller, Wilfried and Himmelstoß, Felix}, title = {Device for Avoiding the Destructive Effects of Commutation Failures on Line Commutated Converters}, series = {Proceedings of the International Conference on Electrical Drives and Power Electronics (EDPE 2005)}, booktitle = {Proceedings of the International Conference on Electrical Drives and Power Electronics (EDPE 2005)}, subject = {Power Conversion}, language = {en} } @inproceedings{HimmelstossEcker, author = {Himmelstoß, Felix and Ecker, M.}, title = {Analyzes of a Bidirectional DC-DC Half-Bridge converter with Zero-Voltage Switching}, series = {International Symposium on Signals, Circuits and Systems (ISSCS 2005)}, booktitle = {International Symposium on Signals, Circuits and Systems (ISSCS 2005)}, pages = {449 -- 452}, subject = {Power Conversion}, language = {en} } @inproceedings{BraunerHimmelstossPascolietal., author = {Brauner, G{\"u}nther and Himmelstoß, Felix and Pascoli, G. and Pirker, Franz and Schwarz, A.}, title = {An Automotive Hybrid Switch}, series = {Proceedings of the 21st Worldwide Battery, Hybrid and Fuel Cell Electric Vehicle Symposium \& Exhibition (EVS 21)}, booktitle = {Proceedings of the 21st Worldwide Battery, Hybrid and Fuel Cell Electric Vehicle Symposium \& Exhibition (EVS 21)}, subject = {Automotive}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {High Efficiency DC-to-AC Power Inverter}, series = {Proceedings of the International Conference on Electrical Drives and Power Electronics (EDPE 2005)}, booktitle = {Proceedings of the International Conference on Electrical Drives and Power Electronics (EDPE 2005)}, subject = {Power Conversion}, language = {en} } @article{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {High Efficiency DC-to-AC Power Inverter with Special DC Interface}, series = {AUTOMATIKA}, journal = {AUTOMATIKA}, number = {46}, pages = {143 -- 148}, subject = {Power Inversion}, language = {en} } @inproceedings{HauserHimmelstossWurm, author = {Hauser, H. and Himmelstoß, Felix and Wurm, P.}, title = {Flux measurements and modeling of the magnetic hysteresis for a zero-voltage switching dc-to-dc converter}, series = {Proceedings of the 47th Annual conference on Magnetism \& Magnetic Materials}, booktitle = {Proceedings of the 47th Annual conference on Magnetism \& Magnetic Materials}, pages = {8790 -- 8792}, subject = {Hysteresis}, language = {en} } @inproceedings{FenzBraunerFaltinetal., author = {Fenz, C. and Brauner, G{\"u}nther and Faltin, C. and Krall, C. and Himmelstoß, Felix}, title = {A Hybrid Synchronous Switching Device}, series = {Proceedings of the Conference on Power Electronics and Motion Control (EPE-PEMC 2004)}, booktitle = {Proceedings of the Conference on Power Electronics and Motion Control (EPE-PEMC 2004)}, pages = {7 -- 12}, subject = {Switching Device}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Bi-directional DC-to-DC converter for solar battery backup applications}, series = {IEEE Power Electronics Specialists Conference (PESC 2004)}, booktitle = {IEEE Power Electronics Specialists Conference (PESC 2004)}, pages = {2070 -- 2074}, subject = {Power Conversion}, language = {en} } @inproceedings{HimmelstossWimmer, author = {Himmelstoß, Felix and Wimmer, Eduard}, title = {Simple DC-to-DC Converters with the Possibility of Bipolar Input Voltage}, series = {Proceedings of the European Power Electronics Conference (EPE 2003)}, booktitle = {Proceedings of the European Power Electronics Conference (EPE 2003)}, subject = {Power Conversion}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Optimized DC-to-AC Power Inverter for Power Grid Operation}, series = {Proceedings of the Conference on Power Electronics and Motion Control (EPE-PEMC 2004)}, booktitle = {Proceedings of the Conference on Power Electronics and Motion Control (EPE-PEMC 2004)}, pages = {229 -- 232}, subject = {Power Inversion}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {High Efficiency Multi Stage/Level Solar Converters}, series = {Proceedings of the 11th International Conference on Science, Education and Society}, booktitle = {Proceedings of the 11th International Conference on Science, Education and Society}, pages = {161 -- 165}, subject = {Solar Cell}, language = {en} } @inproceedings{HimmelstossBekhertiEderer, author = {Himmelstoß, Felix and Bekherti, H. and Ederer, C.}, title = {A Simple DC-to-DC Converter with the Possibility of Bipolar Output}, series = {Proceedings of the 28th Annual Conference of the IEEE Industrial Electronics Society (IECON 2002)}, booktitle = {Proceedings of the 28th Annual Conference of the IEEE Industrial Electronics Society (IECON 2002)}, pages = {1243 -- 1248}, subject = {Power Conversion}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Improved 1 kW solar inverter with wide input range}, series = {Proceedings of IEEE Signals, Circuits and Systems (SCS 2003)}, booktitle = {Proceedings of IEEE Signals, Circuits and Systems (SCS 2003)}, pages = {201 -- 204}, subject = {Power Inversion}, language = {en} } @article{HauserHimmelstossWurm, author = {Hauser, H. and Himmelstoß, Felix and Wurm, P.}, title = {Application of the Energetic Model of Ferromagnetic Loss Calculation During Start-Up of a DC/DC Converter}, series = {JSAEM Studies in Applied Electromagnetics and Mechanics}, journal = {JSAEM Studies in Applied Electromagnetics and Mechanics}, number = {9}, pages = {207 -- 208}, subject = {Power Conversion}, language = {de} } @inproceedings{HauserFulmekHimmelstossetal., author = {Hauser, H. and Fulmek, P. and Himmelstoß, Felix and Wohlbank, T. and W{\"o}hrnschimel, R. and Wurm, P.}, title = {Magnetic Hysterese Modelling of Electronic Components}, series = {Proceedings of the 1st International Workshop on Electronic Design, Test and Application (DELTA 2002)}, booktitle = {Proceedings of the 1st International Workshop on Electronic Design, Test and Application (DELTA 2002)}, pages = {272 -- 279}, subject = {Hysteresis}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Control Strategy of a Solar Inverter (Analysis of a Fifth Order System III)}, series = {Proceedings of the 10th International Power Electronics and Motion Control Conference (EPE-PEMC 2002)}, booktitle = {Proceedings of the 10th International Power Electronics and Motion Control Conference (EPE-PEMC 2002)}, subject = {Power Inversion}, language = {en} } @article{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Control Strategy of a Solar Inverter (Analysis of an Advances Third Order System)}, series = {CSCC-Journal for Recent Advances in Circuits, Systems and Signal Processing}, journal = {CSCC-Journal for Recent Advances in Circuits, Systems and Signal Processing}, pages = {132 -- 137}, subject = {Solar Power}, language = {en} } @article{HimmelstossBekhertiEderer, author = {Himmelstoß, Felix and Bekherti, H. and Ederer, C.}, title = {A New Two-Switch DC-to-AC Converter}, series = {Journal of Electrical Engineering}, journal = {Journal of Electrical Engineering}, number = {2}, subject = {Switch}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {Improved Wide Input Voltage Range 1kW Solar Inverter}, series = {Proceedings of the 7th International Conference on Electronics, Circuits and Systems (ICECS 2000)}, booktitle = {Proceedings of the 7th International Conference on Electronics, Circuits and Systems (ICECS 2000)}, pages = {742 -- 745}, subject = {Solar Power}, language = {en} } @inproceedings{EdelmoserHimmelstoss, author = {Edelmoser, Karl and Himmelstoß, Felix}, title = {High Efficiency Multiphase DC to AC Inverter}, series = {Proceedings of the 9th International Conference on Power Elctronics and Motion Control (EPE-PEMC 2000)}, booktitle = {Proceedings of the 9th International Conference on Power Elctronics and Motion Control (EPE-PEMC 2000)}, pages = {178 -- 181}, subject = {Power Inversion}, language = {en} } @article{HauserHimmelstossWurm, author = {Hauser, H. and Himmelstoß, Felix and Wurm, P.}, title = {Magnetic Loss Measurement and Calculation of a DC/DC Converter}, series = {International Journal of Applied Electromagnetics and Mechanics}, volume = {13}, journal = {International Journal of Applied Electromagnetics and Mechanics}, number = {1 - 4}, pages = {411 -- 419}, subject = {Magnetism}, language = {en} } @inproceedings{HimmelstossIzVotzi, author = {Himmelstoß, Felix and Iz, Ali and Votzi, Helmut}, title = {Quadratic bidirectional buck-boost converter}, series = {Proceedings of 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Sorrento, Italy, June 24-26, 2020}, booktitle = {Proceedings of 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Sorrento, Italy, June 24-26, 2020}, pages = {738 -- 743}, subject = {Buck-Boost converter}, language = {en} } @article{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {Feedforward Control of Quadratic Converters}, series = {WSEAS Transactions of Circuits and Systems}, volume = {20}, journal = {WSEAS Transactions of Circuits and Systems}, number = {2021}, pages = {147 -- 155}, subject = {DC/DC converters}, language = {en} } @inproceedings{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {Four quadratic DC/DC converters with one low-side switch and a tapped inductor at the input side}, series = {Proceedings of IECON 2019, 45th Annual Conference of the IEEE Industrial Electronics Society, Lisbon, Portugal, Sep. 14-17, Lisbon Portugal}, booktitle = {Proceedings of IECON 2019, 45th Annual Conference of the IEEE Industrial Electronics Society, Lisbon, Portugal, Sep. 14-17, Lisbon Portugal}, pages = {1774 -- 1779}, subject = {DC/DC Converter}, language = {en} } @inproceedings{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {Simple Inductive Charge Pump}, series = {Proceedings of 2020 IEEE 14th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), Setubal, Portugal, 1-3 April, 2020}, booktitle = {Proceedings of 2020 IEEE 14th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), Setubal, Portugal, 1-3 April, 2020}, pages = {291 -- 296}, subject = {DC/DC Converter}, language = {en} } @inproceedings{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {A Floating Double Buck-Boost Converter as Driver for a Permanent Exited DC Machine}, series = {Proceedings of the 2021 International Conference on Electrical Drives \& Power Electronics (EDPE 2021), 22.-24. September 2021, Dubrovnik, Croatia}, booktitle = {Proceedings of the 2021 International Conference on Electrical Drives \& Power Electronics (EDPE 2021), 22.-24. September 2021, Dubrovnik, Croatia}, pages = {72 -- 77}, subject = {DC/DC converter}, language = {en} } @article{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Flyback Converter with Quadratic Pre-Stage}, series = {WSEAS Transactions of Circuits and Systems, Vol. 19, 2020}, volume = {2020}, journal = {WSEAS Transactions of Circuits and Systems, Vol. 19, 2020}, number = {Vol. 19}, pages = {156 -- 163}, subject = {DC/DC Converter}, language = {en} } @inproceedings{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {Converters to drive two brushed DC machines}, series = {2021 IEEE 15th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), 14-16 July 2021, Florence, Italy}, booktitle = {2021 IEEE 15th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), 14-16 July 2021, Florence, Italy}, pages = {8}, subject = {DC converters}, language = {en} } @inproceedings{HimmelstossPoepperl, author = {Himmelstoß, Felix and Poepperl, Florian}, title = {Inverting Zero-Current-Switching Buck Converter}, series = {2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC), 26.-29. April 2021, Glivice, Poland}, booktitle = {2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC), 26.-29. April 2021, Glivice, Poland}, pages = {108 -- 113}, subject = {DC/DC converter}, language = {en} } @article{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Modified Fourth-Order Buck-Boost Converter}, series = {WSEAS Transactions of Circuits and Systems}, journal = {WSEAS Transactions of Circuits and Systems}, pages = {33 -- 40}, subject = {buck-boost converter}, language = {en} } @inproceedings{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Modified Basic Converters in the Discontinuous Mode}, series = {2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC), 26.-29. April 2021, Glivice, Poland}, booktitle = {2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC), 26.-29. April 2021, Glivice, Poland}, pages = {118 -- 123}, subject = {buck-boost converter}, language = {en} } @article{HimmelstossVotzi, author = {Himmelstoß, Felix and Votzi, Helmut}, title = {Converter for the Drive of two Brushed DC motors}, series = {WSEAS Transactions of Circuits and Systems}, volume = {15}, journal = {WSEAS Transactions of Circuits and Systems}, number = {2020}, pages = {249 -- 256}, subject = {brushed DC machine}, language = {en} } @inproceedings{HimmelstossVotziWindisch, author = {Himmelstoß, Felix and Votzi, Helmut and Windisch, Michael}, title = {Quadratic DC/DC converter with autotransformer at the output side}, series = {Proceedings of 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE), Delft, Netherlands, June 17-19, 2020}, booktitle = {Proceedings of 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE), Delft, Netherlands, June 17-19, 2020}, pages = {767 -- 772}, subject = {DC/DC Converter}, language = {en} } @article{YalcinHimmelstoss, author = {Yalcin, Faruk and Himmelstoß, Felix}, title = {Boost Converter based 3-phase AC-AC Active Tracking Voltage Regulator Controlled by a Robust Hybrid Control Method}, series = {Sakarya University Journal of Science}, volume = {2022}, journal = {Sakarya University Journal of Science}, number = {26(1)}, pages = {24 -- 37}, subject = {AC-AC regulator}, language = {en} } @inproceedings{HimmelstossJungmayer, author = {Himmelstoß, Felix and Jungmayer, Michael}, title = {Zero-Current-Switching Buck Converter}, series = {Proceedings of 2019 International Conference on Electrical Drives \& Power Electronics (EDPE), Novy Smokovec, Slovakia, 24-26 Sept. 2019}, booktitle = {Proceedings of 2019 International Conference on Electrical Drives \& Power Electronics (EDPE), Novy Smokovec, Slovakia, 24-26 Sept. 2019}, pages = {36 -- 41}, subject = {DC/DC Converter}, language = {en} } @article{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Modified Buck-Boost Converter as DC Motor Driver with Continuous Input Current}, series = {WSEAS Transactions of Circuits and Systems}, volume = {2020}, journal = {WSEAS Transactions of Circuits and Systems}, number = {19}, pages = {186 -- 194}, subject = {DC/DC converter}, language = {en} } @article{HimmelstossJungmayer, author = {Himmelstoß, Felix and Jungmayer, Michael}, title = {Resonante ZCS Konverter mit beschr{\"a}nktem Arbeitsbereich}, series = {e \& i Elektrotechnik und Informationstechnik}, journal = {e \& i Elektrotechnik und Informationstechnik}, number = {140}, doi = {10.1007/s00502-022-01113-1}, pages = {123 -- 131}, abstract = {DC/DC-Konverter wandeln eine Eingangsspannung in eine Ausgangsspannung. In diesem Beitrag werden drei solche Konverter behandelt, die aus den drei Grundschaltungen hergeleitet sind. Im Gegensatz zu den Originalstrukturen sind diese nur f{\"u}r einen geringeren Spannungs{\"u}bersetzungsbereich geeignet, haben aber den Vorteil, dass die elektronischen Schalter immer bei Strom null schalten und die Dioden nicht zwangsweise, sondern immer von selbst ausschalten. Die Gewinnung der Konverterschaltungen wird erl{\"a}utert, und die Funktionsweisen werden durch mathematische Beschreibung, durch Skizzen und mithilfe des uZ-i-Diagramms erkl{\"a}rt. Weiters werden einige m{\"o}gliche Erweiterungen der Schaltungen gezeigt.}, subject = {DC/DC-Konverter}, language = {de} } @inproceedings{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Quadratic Flyback Converter}, series = {Proceedings of PCIM Europe digital days 2020; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuernberg, Germany, 7-8 July, 2020}, booktitle = {Proceedings of PCIM Europe digital days 2020; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuernberg, Germany, 7-8 July, 2020}, pages = {6}, subject = {Quadratic Power Converter}, language = {en} } @article{Himmelstoss, author = {Himmelstoß, Felix}, title = {Improved positive output voltage super-lift Boost converter}, series = {WSEAS TRANSACTIONS on POWER SYSTEMS}, volume = {2022}, journal = {WSEAS TRANSACTIONS on POWER SYSTEMS}, number = {Vol. 17}, pages = {68 -- 75}, subject = {DC/DC converter}, language = {en} } @inproceedings{HimmelstossEdelmoser, author = {Himmelstoß, Felix and Edelmoser, Karl}, title = {Zero-Current-Switching Boost Converter, Power Conversion and Intelligent Motion}, series = {Proceedings of PCIM 2019, Nuernberg, Germany, May 7-9, 2019}, booktitle = {Proceedings of PCIM 2019, Nuernberg, Germany, May 7-9, 2019}, isbn = {978-3-8007-4938-6}, pages = {1686 -- 1691}, subject = {Discontinuous Conduction Mode}, language = {en} } @article{VotziHimmelstossErtl, author = {Votzi, Helmut and Himmelstoß, Felix and Ertl, Hans}, title = {Active Hybrid Filter Applied with a Multi-Cell Switch-Mode Power Amplifier}, series = {Power Electronics and Motion Control PEMC 2018, 27-29 August 2018, Budapest, Hungary}, journal = {Power Electronics and Motion Control PEMC 2018, 27-29 August 2018, Budapest, Hungary}, subject = {Amplifier}, language = {en} }