Pub Date : 1978-06-13DOI: 10.1109/PESC.1978.7072331
Yoshiajki Tanaka, T. Mochizuki
An accurate impulse model using the modified z-transform method is presented, for the analysis of the dynamic behaviour of single-phase fullcontrolled thyristor-bridge with a uniform and a natural sampling. The effect of the commutating impedance is considered exactly. For the large signal perturbation, the graphical method based on the transition mapping is presented.
{"title":"Analysis of thyristor-bridge control system with commutating impedance","authors":"Yoshiajki Tanaka, T. Mochizuki","doi":"10.1109/PESC.1978.7072331","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072331","url":null,"abstract":"An accurate impulse model using the modified z-transform method is presented, for the analysis of the dynamic behaviour of single-phase fullcontrolled thyristor-bridge with a uniform and a natural sampling. The effect of the commutating impedance is considered exactly. For the large signal perturbation, the graphical method based on the transition mapping is presented.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121108957","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072334
F. H. Branin, Peter M. Vellotti
Pulse width modulated (PWM) DC/DC converters, as typified by the transistor switching regulated (TSR) power supply treated in this paper, can be simulated by modeling each diode and/or switching transistor as a two-valued resistance. In this way, the power supply is represented as a sequence of strictly linear circuits, each having the same topology but with its two-valued resistances determined by the corresponding on-off states of its diodes and transistors. We can compute the startup behavior and periodic response of such power supplies in terms of the eigenvalues and eigenvectors of each of these linear circuits in sequence. What is more, we can also obtain directly the overall state transition matrix from which, in turn, we can predict the open loop characteristics of the entire power supply. This information is vital to the design of feedback networks that provide stable regulation.
{"title":"Open loop characterization of pulse width modulated DC/DC converters by sequential linear analysis","authors":"F. H. Branin, Peter M. Vellotti","doi":"10.1109/PESC.1978.7072334","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072334","url":null,"abstract":"Pulse width modulated (PWM) DC/DC converters, as typified by the transistor switching regulated (TSR) power supply treated in this paper, can be simulated by modeling each diode and/or switching transistor as a two-valued resistance. In this way, the power supply is represented as a sequence of strictly linear circuits, each having the same topology but with its two-valued resistances determined by the corresponding on-off states of its diodes and transistors. We can compute the startup behavior and periodic response of such power supplies in terms of the eigenvalues and eigenvectors of each of these linear circuits in sequence. What is more, we can also obtain directly the overall state transition matrix from which, in turn, we can predict the open loop characteristics of the entire power supply. This information is vital to the design of feedback networks that provide stable regulation.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123687154","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072341
T. Lipo
Three types of feedback compensation schemes are described which can be used to reduce the torque pulsations which normally occur when induction machines are supplied from a current source inverter. The approach is verified both by a detailed computer simulation and also by test results from an actual system. Limitations of the method near zero slip frequency (no load) is discussed and a means suggested for elimination of the problem.
{"title":"Analysis and control of torque pulsations in current fed induction motor drives","authors":"T. Lipo","doi":"10.1109/PESC.1978.7072341","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072341","url":null,"abstract":"Three types of feedback compensation schemes are described which can be used to reduce the torque pulsations which normally occur when induction machines are supplied from a current source inverter. The approach is verified both by a detailed computer simulation and also by test results from an actual system. Limitations of the method near zero slip frequency (no load) is discussed and a means suggested for elimination of the problem.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130586042","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072339
R. Kapustka, J. R. Lanier
This paper presents a discussion of the power processor for an electrical power system for a 25 kW Power Module that could support the Space Shuttle program during the 1980's and 1990's, and which could be a stepping stone to future large space power systems. Trades that led to selection of a microprocessor controlled power processor are briefly discussed. Emphasis is given to the power processing equipment that uses a microprocessor to provide versatility that allows multiple use and to provide for future growth by reprogramming output voltage to a higher level ( to 120 V from 30 V). Component selection and design considerations are also discussed.
{"title":"A programmable power processor for a 25 kW power module","authors":"R. Kapustka, J. R. Lanier","doi":"10.1109/PESC.1978.7072339","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072339","url":null,"abstract":"This paper presents a discussion of the power processor for an electrical power system for a 25 kW Power Module that could support the Space Shuttle program during the 1980's and 1990's, and which could be a stepping stone to future large space power systems. Trades that led to selection of a microprocessor controlled power processor are briefly discussed. Emphasis is given to the power processing equipment that uses a microprocessor to provide versatility that allows multiple use and to provide for future growth by reprogramming output voltage to a higher level ( to 120 V from 30 V). Component selection and design considerations are also discussed.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114552584","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072368
C. Deisch
A switching converter with an LC output filter behaves as a loose-tolerance voltage-controlled current source if each switch closure is ended when switch current reaches an adjustable threshold. This converter is then combined with an external feedback to produce a precise output voltage. By generating a fixed voltage with a current source in this manner, the converter has many advantages including continuous protection of the switches, stable and equal load sharing when several converters are operated in parallel, inherent overload protection, automatic switch symmetry correction, and fast system response.
{"title":"Simple switching control method changes power converter into a current source","authors":"C. Deisch","doi":"10.1109/PESC.1978.7072368","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072368","url":null,"abstract":"A switching converter with an LC output filter behaves as a loose-tolerance voltage-controlled current source if each switch closure is ended when switch current reaches an adjustable threshold. This converter is then combined with an external feedback to produce a precise output voltage. By generating a fixed voltage with a current source in this manner, the converter has many advantages including continuous protection of the switches, stable and equal load sharing when several converters are operated in parallel, inherent overload protection, automatic switch symmetry correction, and fast system response.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126249115","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072332
S. Garrett, J. Bowers, J. E. Oreilly
A computer program is described that automatically produces non-linear, state equations directly from a simple topological description of an electrical and/or mechanical network. Also, by automatically eliminating unnecessary states, the program generates a simplified macro-model, very useful for further design and analysis.
{"title":"A computer program to automatically generate state equations & macro-models","authors":"S. Garrett, J. Bowers, J. E. Oreilly","doi":"10.1109/PESC.1978.7072332","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072332","url":null,"abstract":"A computer program is described that automatically produces non-linear, state equations directly from a simple topological description of an electrical and/or mechanical network. Also, by automatically eliminating unnecessary states, the program generates a simplified macro-model, very useful for further design and analysis.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125155499","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072342
W. Praeg
An efficient thyristor switching circuit generates 1.1 kJ magnet pulses. A 1 - cos ωt current rise of typically 2 ms is adjustable in magnitude and duration. It is followed by a 100 ms flattop and a 1 + cos ωt current decrease.
一个有效的晶闸管开关电路产生1.1 kJ的磁脉冲。1 - cos ω - t的电流上升通常为2毫秒，其幅度和持续时间可调。接着是100 ms的平顶和1 + cos ωt的电流下降。
{"title":"A pulsed power supply for Tokamak equilibrium field coils","authors":"W. Praeg","doi":"10.1109/PESC.1978.7072342","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072342","url":null,"abstract":"An efficient thyristor switching circuit generates 1.1 kJ magnet pulses. A 1 - cos ωt current rise of typically 2 ms is adjustable in magnitude and duration. It is followed by a 100 ms flattop and a 1 + cos ωt current decrease.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125246047","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072344
Slobodan Cuk
It is demonstrated, first, how the complex modular converter structures (such as cascade of the boost and buck converters) can be easily modelled in the discontinuous current mode by use of the state-space averaging method and equivalent circuit approach and by taking advantage of the known properties and circuit models of the individual converter modules (boost and buck converters). Then, the recently introduced new optimum topology switching dc-to-dc converter is analyzed in the discontinuous inductor current mode. Unlike other converters with two inductors (such as cascaded boost-buck), the new converter has a unique feature that both inductor currents become discontinuous at the same instant, and remain so with the same second (decay) interval. Moreover, for the first time, the discontinuity of the inductor current takes place at a nonzero inductor current level, with dc current, passing through both inductors in the remaining third part of the switching period. It is shown how this peculiar behaviour can be successfully modelled and a simple analytic criterion for determination of the boundary between the continuous and discontinuous inductor current mode is obtained.
{"title":"Discontinuous inductor current in the optimum topology switching converter","authors":"Slobodan Cuk","doi":"10.1109/PESC.1978.7072344","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072344","url":null,"abstract":"It is demonstrated, first, how the complex modular converter structures (such as cascade of the boost and buck converters) can be easily modelled in the discontinuous current mode by use of the state-space averaging method and equivalent circuit approach and by taking advantage of the known properties and circuit models of the individual converter modules (boost and buck converters). Then, the recently introduced new optimum topology switching dc-to-dc converter is analyzed in the discontinuous inductor current mode. Unlike other converters with two inductors (such as cascaded boost-buck), the new converter has a unique feature that both inductor currents become discontinuous at the same instant, and remain so with the same second (decay) interval. Moreover, for the first time, the discontinuity of the inductor current takes place at a nonzero inductor current level, with dc current, passing through both inductors in the remaining third part of the switching period. It is shown how this peculiar behaviour can be successfully modelled and a simple analytic criterion for determination of the boundary between the continuous and discontinuous inductor current mode is obtained.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134275697","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072371
J. Graves, H. Lenox, J. R. Lanier, R. Kapustka
This paper presents a discussion of a modular, multiple output power converter developed for a wide range of space applications and selected as NASA standard hardware. The unique packaging concept, advanced heat removal techniques, and electrical design and characteristics are presented in detail.
{"title":"A standard load center converter power supply","authors":"J. Graves, H. Lenox, J. R. Lanier, R. Kapustka","doi":"10.1109/PESC.1978.7072371","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072371","url":null,"abstract":"This paper presents a discussion of a modular, multiple output power converter developed for a wide range of space applications and selected as NASA standard hardware. The unique packaging concept, advanced heat removal techniques, and electrical design and characteristics are presented in detail.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117179540","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 : 1978-06-13DOI: 10.1109/PESC.1978.7072372
F. Schwarz, J. Klaassens, W. Smit
A 95 percent efficient parallel inverter-dcconverter of 500 Watt was devised with the use of transistor switches in the form of a full bridge configuration. This converter is capable of performing, concurrently, the functions^of scaling and stabilization of dc voltage in one single operation at an internal frequency of 20 kHz. The performance of this converter is ascribed to (1) the avoidance of significant parasitic effects in the power transformer which contains a saturable magnetic core and (2) a method of unequivocal sequential operation of the power transistors. The philosophy of the applied approach is derived from the problem areas of the state of the art. Test results of a laboratory breadboard are presented and evaluated.
{"title":"A 95 efficient voltage regulating 500 watt full bridge parallel inverter-converter module with an internal frequency of 20 kHZ","authors":"F. Schwarz, J. Klaassens, W. Smit","doi":"10.1109/PESC.1978.7072372","DOIUrl":"https://doi.org/10.1109/PESC.1978.7072372","url":null,"abstract":"A 95 percent efficient parallel inverter-dcconverter of 500 Watt was devised with the use of transistor switches in the form of a full bridge configuration. This converter is capable of performing, concurrently, the functions^of scaling and stabilization of dc voltage in one single operation at an internal frequency of 20 kHz. The performance of this converter is ascribed to (1) the avoidance of significant parasitic effects in the power transformer which contains a saturable magnetic core and (2) a method of unequivocal sequential operation of the power transistors. The philosophy of the applied approach is derived from the problem areas of the state of the art. Test results of a laboratory breadboard are presented and evaluated.","PeriodicalId":363671,"journal":{"name":"1978 IEEE Power Electronics Specialists Conference","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123492049","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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