Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612339
N. Femia
In this paper a method for the formulation of switched RLC (SRLC) circuit equations is discussed. The method is aimed at providing a suitable data structure for time-domain simulations, supporting the automatic determination of the topology entered by SRLC nets after forced commutations of any switching device. The data structure consists in a Master-Slave Connection Matrix, defined using the compensation theorem, which permits a straight evaluation of the influence of the forced commutation of any switch upon the currents of all switching devices in the net. Problems connected to the presence of controlled sources are discussed. Some applications to the simulation of power electronic circuits are presented.
{"title":"Automatability of consistent switches state search in computer aided analysis of switched RLC networks","authors":"N. Femia","doi":"10.1109/CIPE.1996.612339","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612339","url":null,"abstract":"In this paper a method for the formulation of switched RLC (SRLC) circuit equations is discussed. The method is aimed at providing a suitable data structure for time-domain simulations, supporting the automatic determination of the topology entered by SRLC nets after forced commutations of any switching device. The data structure consists in a Master-Slave Connection Matrix, defined using the compensation theorem, which permits a straight evaluation of the influence of the forced commutation of any switch upon the currents of all switching devices in the net. Problems connected to the presence of controlled sources are discussed. Some applications to the simulation of power electronic circuits are presented.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127946718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612335
L. Kamas, S. Sanders
This paper presents and applies reliability analysis methods to power electronic circuit simulation. The focus is on the first-order reliability method (FORM). Two circuits are analyzed: an open-loop updown power converter; and a similar closed-loop circuit that is currently in mass production. The open-loop circuit provides an example from which rich quantitative data can be obtained for various methods. The closed-loop production design circuit provides a proof-of-concept for a FORM application on a complex design. The implementation includes parallel gradient computations across six networked workstations. The parallel environment is described in detail.
{"title":"Power electronic circuit reliability analysis incorporating parallel simulations","authors":"L. Kamas, S. Sanders","doi":"10.1109/CIPE.1996.612335","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612335","url":null,"abstract":"This paper presents and applies reliability analysis methods to power electronic circuit simulation. The focus is on the first-order reliability method (FORM). Two circuits are analyzed: an open-loop updown power converter; and a similar closed-loop circuit that is currently in mass production. The open-loop circuit provides an example from which rich quantitative data can be obtained for various methods. The closed-loop production design circuit provides a proof-of-concept for a FORM application on a complex design. The implementation includes parallel gradient computations across six networked workstations. The parallel environment is described in detail.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128495828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612337
D. K. Jackson, S. Leeb, A. Schultz, A. Mitwalli
In a regulation application, a power supply is typically tasked with maintaining a fixed voltage or current in the face of possible disturbances. In a tracking application, on the other hand, a controller works to cause an average output voltage or current to follow a desired reference waveform as a function of time or some other variable. This paper describes a large-signal linear, multirate digital controller for, among other possible applications, charging electric vehicle batteries. This controller permits the charger to track and deliver a desired current trajectory for a wide range of loads while providing a unity-power factor interface to the electric utility.
{"title":"A comparison of multirate digital compensators for a battery charger","authors":"D. K. Jackson, S. Leeb, A. Schultz, A. Mitwalli","doi":"10.1109/CIPE.1996.612337","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612337","url":null,"abstract":"In a regulation application, a power supply is typically tasked with maintaining a fixed voltage or current in the face of possible disturbances. In a tracking application, on the other hand, a controller works to cause an average output voltage or current to follow a desired reference waveform as a function of time or some other variable. This paper describes a large-signal linear, multirate digital controller for, among other possible applications, charging electric vehicle batteries. This controller permits the charger to track and deliver a desired current trajectory for a wide range of loads while providing a unity-power factor interface to the electric utility.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128587657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612340
T. Kato, W. Tachibana
This paper proposes a new periodic steady-state analysis method for an autonomous power electronic system by solving a periodic steady-state condition and a switch condition simultaneously for finding initial values. The method utilizes switching operations, which are a characteristic feature of a power electronic circuit, to express a variation of a period. There is no need to include a period T as an unknown variable. This modification eliminates two disadvantages of the conventional method; one is failure of finding solutions due to wrong initial values and the other is that an initial time does not coincide with a starting time of a circuit topological mode.
{"title":"Periodic steady-state analysis of an autonomous power electronic system by a modified shooting method","authors":"T. Kato, W. Tachibana","doi":"10.1109/CIPE.1996.612340","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612340","url":null,"abstract":"This paper proposes a new periodic steady-state analysis method for an autonomous power electronic system by solving a periodic steady-state condition and a switch condition simultaneously for finding initial values. The method utilizes switching operations, which are a characteristic feature of a power electronic circuit, to express a variation of a period. There is no need to include a period T as an unknown variable. This modification eliminates two disadvantages of the conventional method; one is failure of finding solutions due to wrong initial values and the other is that an initial time does not coincide with a starting time of a circuit topological mode.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131299778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612351
J. Xu, A. Lakhsasi, Z. Yao, V. Rajagopalan
In the case of three-phase diode bridge rectification, the harmonic content of the input currents can be reduced by injecting a calculated amount of third harmonic current on the AC side. The paper presents an analysis, by the finite element method, of a magnetic device (coupled three-phase inductor) used as current injection interface in a third harmonic modulation circuit. The magnetic device is designed to block fundamental currents and to offer least resistance to third harmonic currents. In order to reduce its zero sequence inductance, which may affect the operation of the diode bridge, a conductive shield is added to cover the coupled inductor. On the other hand, the conductive shield produces excessive power losses due to high eddy currents induced by the third harmonic field. The electrothermal aspect of the coupled inductor is therefore investigated. The analysis is performed using a realistic 3D model of the magnetic device.
{"title":"Analysis by finite element method of a coupled inductor circuit used as current injection interface","authors":"J. Xu, A. Lakhsasi, Z. Yao, V. Rajagopalan","doi":"10.1109/CIPE.1996.612351","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612351","url":null,"abstract":"In the case of three-phase diode bridge rectification, the harmonic content of the input currents can be reduced by injecting a calculated amount of third harmonic current on the AC side. The paper presents an analysis, by the finite element method, of a magnetic device (coupled three-phase inductor) used as current injection interface in a third harmonic modulation circuit. The magnetic device is designed to block fundamental currents and to offer least resistance to third harmonic currents. In order to reduce its zero sequence inductance, which may affect the operation of the diode bridge, a conductive shield is added to cover the coupled inductor. On the other hand, the conductive shield produces excessive power losses due to high eddy currents induced by the third harmonic field. The electrothermal aspect of the coupled inductor is therefore investigated. The analysis is performed using a realistic 3D model of the magnetic device.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114602108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612350
J. Espinoza, G. Joós, H. Jin
Active filters use power converters to inject equal but opposite harmonics into the system, thus neutralizing the effect of the load harmonics. In this paper, the space vector PWM technique is applied to active power filter systems. A systematic way of simulating the space vector technique in a general-purpose simulation program is described and simulation results are provided in the paper.
{"title":"Modelling and implementation of space vector PWM techniques in active filter applications","authors":"J. Espinoza, G. Joós, H. Jin","doi":"10.1109/CIPE.1996.612350","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612350","url":null,"abstract":"Active filters use power converters to inject equal but opposite harmonics into the system, thus neutralizing the effect of the load harmonics. In this paper, the space vector PWM technique is applied to active power filter systems. A systematic way of simulating the space vector technique in a general-purpose simulation program is described and simulation results are provided in the paper.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114804856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612346
B. Fatemizadeh, P. Lauritzen, D. Siber
The problems and future trends of the modeling of power devices are reviewed and the different modeling methods compared as to their compromise between convenience, accuracy, numerical efficiency and accuracy in implementing physical effects. Many of the existing power device models are listed, and their main features are identified and compared.
{"title":"Modeling of power semiconductor devices, problems, limitations and future trends","authors":"B. Fatemizadeh, P. Lauritzen, D. Siber","doi":"10.1109/CIPE.1996.612346","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612346","url":null,"abstract":"The problems and future trends of the modeling of power devices are reviewed and the different modeling methods compared as to their compromise between convenience, accuracy, numerical efficiency and accuracy in implementing physical effects. Many of the existing power device models are listed, and their main features are identified and compared.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127018517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612345
V. Caliskan, G. Verghese, A. Stanković
This paper presents some of the issues involved in applying frequency-selective averaging to modeling the dynamic behavior of PWM DC-DC converters. We use the boost converter as an example to show the details involved in deriving some novel averaged models and use simplifications to highlight the accuracy of the models even when traditional small-ripple conditions are not satisfied.
{"title":"Multi-frequency averaging of DC/DC converters","authors":"V. Caliskan, G. Verghese, A. Stanković","doi":"10.1109/CIPE.1996.612345","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612345","url":null,"abstract":"This paper presents some of the issues involved in applying frequency-selective averaging to modeling the dynamic behavior of PWM DC-DC converters. We use the boost converter as an example to show the details involved in deriving some novel averaged models and use simplifications to highlight the accuracy of the models even when traditional small-ripple conditions are not satisfied.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123891340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612336
L.E. Amaya, P. Krein, F. Najm
Currently there are no computer-aided-design (CAD) tools dedicated to the design and synthesis of power electronic circuits. The design process has not been formalized, and most of the efforts in computer tools have been oriented towards simulation, neglecting other stages of the design process that can also benefit from their use. This paper presents an outline of the structure of an automated power converter circuit design tool. The different parts of this tool are described along with the problems that make them difficult or interesting. Current progress in the development of some of these parts is also presented.
{"title":"A design methodology for power electronics","authors":"L.E. Amaya, P. Krein, F. Najm","doi":"10.1109/CIPE.1996.612336","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612336","url":null,"abstract":"Currently there are no computer-aided-design (CAD) tools dedicated to the design and synthesis of power electronic circuits. The design process has not been formalized, and most of the efforts in computer tools have been oriented towards simulation, neglecting other stages of the design process that can also benefit from their use. This paper presents an outline of the structure of an automated power converter circuit design tool. The different parts of this tool are described along with the problems that make them difficult or interesting. Current progress in the development of some of these parts is also presented.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127483527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-11DOI: 10.1109/CIPE.1996.612352
B. Masserant, T. Stuart
Since electric vehicle (EV) batteries need frequent recharging, it is usually desirable to do this as rapidly as possible. In general, the charging process can be divided into two periods referred to as the "bulk" charge and the "trickle" charge. Since the trickle charge is restricted to relatively low battery currents, the ability to reduce the charging time depends on delivering as much current as possible during the bulk charging period. This is especially true for those instances where the trickle charge occurs infrequently or not at all. It is expected that this will be the case where some mechanism other than a trickle charge is used to equalize the individual battery voltages. Here, the authors calculate the IGBT junction temperature of electric vehicle battery chargers in order to maximize charging current delivery.
{"title":"On-Line computation of T/sub J/ for EV battery chargers","authors":"B. Masserant, T. Stuart","doi":"10.1109/CIPE.1996.612352","DOIUrl":"https://doi.org/10.1109/CIPE.1996.612352","url":null,"abstract":"Since electric vehicle (EV) batteries need frequent recharging, it is usually desirable to do this as rapidly as possible. In general, the charging process can be divided into two periods referred to as the \"bulk\" charge and the \"trickle\" charge. Since the trickle charge is restricted to relatively low battery currents, the ability to reduce the charging time depends on delivering as much current as possible during the bulk charging period. This is especially true for those instances where the trickle charge occurs infrequently or not at all. It is expected that this will be the case where some mechanism other than a trickle charge is used to equalize the individual battery voltages. Here, the authors calculate the IGBT junction temperature of electric vehicle battery chargers in order to maximize charging current delivery.","PeriodicalId":126938,"journal":{"name":"5th IEEE Workshop on Computers in Power Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116128971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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