Pub Date : 1995-03-05DOI: 10.1109/APEC.1995.469061
V. John, N. Mohan
Standby power supplies (SPS) are widely used as power backup systems for critical electrical loads. A single phase SPS utilizing a high frequency AC link is studied. Use of a high frequency transformer results in a compact and light weight system. Energy loss introduced in the system due to the high frequency AC link is analyzed. Design of the control circuit, to obtain a sinusoidal output voltage with linear and nonlinear loads, is explained. The SPS is used as an active filter to obtain sinusoidal line current under normal conditions of the utility.<>
{"title":"Standby power supply with high frequency isolation","authors":"V. John, N. Mohan","doi":"10.1109/APEC.1995.469061","DOIUrl":"https://doi.org/10.1109/APEC.1995.469061","url":null,"abstract":"Standby power supplies (SPS) are widely used as power backup systems for critical electrical loads. A single phase SPS utilizing a high frequency AC link is studied. Use of a high frequency transformer results in a compact and light weight system. Energy loss introduced in the system due to the high frequency AC link is analyzed. Design of the control circuit, to obtain a sinusoidal output voltage with linear and nonlinear loads, is explained. The SPS is used as an active filter to obtain sinusoidal line current under normal conditions of the utility.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123166064","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 : 1995-03-05DOI: 10.1109/APEC.1995.469019
E. Unkauf, D. Torrey
High performance induction motor drive systems typically rely on field oriented control methods. However, achieving field oriented control requires machine specific knowledge, and tracking of drifting motor parameters in order to maintain control. This paper presents an alternative method of control based on a direct model reference adaptive control algorithm which does not require exact knowledge of motor parameters. The algorithm does not rely on maintaining a field oriented state, and is demonstrated to be robust with respect to parameter variations. The paper presents the control theory with experimental results. It is shown through experiment that the control approach is insensitive to motor saturation and parameter variations encountered in motors of similar rating and different manufacturer.<>
{"title":"Direct model reference control of an induction motor","authors":"E. Unkauf, D. Torrey","doi":"10.1109/APEC.1995.469019","DOIUrl":"https://doi.org/10.1109/APEC.1995.469019","url":null,"abstract":"High performance induction motor drive systems typically rely on field oriented control methods. However, achieving field oriented control requires machine specific knowledge, and tracking of drifting motor parameters in order to maintain control. This paper presents an alternative method of control based on a direct model reference adaptive control algorithm which does not require exact knowledge of motor parameters. The algorithm does not rely on maintaining a field oriented state, and is demonstrated to be robust with respect to parameter variations. The paper presents the control theory with experimental results. It is shown through experiment that the control approach is insensitive to motor saturation and parameter variations encountered in motors of similar rating and different manufacturer.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125829017","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 : 1995-03-05DOI: 10.1109/APEC.1995.469046
W. Chen, F. Lee, M. Jovanovic, J. Sabate
Four implementations of a full-bridge zero-voltage-switched PWM power converter are discussed. The merits and limitations of each implementation are reviewed and their key features and characteristics are compared. In addition, experimental performance comparisons of the four power converters were performed on 1 kW/400 V laboratory prototypes.<>
{"title":"A comparative study of a class of full bridge zero-voltage-switched PWM converters","authors":"W. Chen, F. Lee, M. Jovanovic, J. Sabate","doi":"10.1109/APEC.1995.469046","DOIUrl":"https://doi.org/10.1109/APEC.1995.469046","url":null,"abstract":"Four implementations of a full-bridge zero-voltage-switched PWM power converter are discussed. The merits and limitations of each implementation are reviewed and their key features and characteristics are compared. In addition, experimental performance comparisons of the four power converters were performed on 1 kW/400 V laboratory prototypes.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126926798","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 : 1995-03-05DOI: 10.1109/APEC.1995.469049
H. Takano, J. Takahashi, T. Hatakeyama, M. Nakaoka
The main purpose of this study is to describe the particular characteristic features and inherent benefits of series, parallel and series-parallel resonant tank inverter-fed DC-DC power converters with a high-voltage high-frequency transformer link for medical-use X-ray high-voltage power generators from a practical application viewpoint, along with a specially-designed high-voltage transformer and its dynamic circuit modeling considering iron and copper loss resistances. An effective method to take advantage of the harmful parasitic resonant circuit parameters of the high-voltage high-frequency transformers which are used in three typical resonant tank circuit topologies and their output voltage performances in both the steady and dynamic-states are comparatively discussed. The dynamic and steady-state characteristics of these resonant power converters are evaluated on the basis of computer simulation results under the conditions of wide allowable load ranges used in actual X-ray high-voltage DC power generators.<>
{"title":"Feasible characteristic evaluations of resonant tank PWM inverter-linked DC-DC high-power converters for medical-use high-voltage application","authors":"H. Takano, J. Takahashi, T. Hatakeyama, M. Nakaoka","doi":"10.1109/APEC.1995.469049","DOIUrl":"https://doi.org/10.1109/APEC.1995.469049","url":null,"abstract":"The main purpose of this study is to describe the particular characteristic features and inherent benefits of series, parallel and series-parallel resonant tank inverter-fed DC-DC power converters with a high-voltage high-frequency transformer link for medical-use X-ray high-voltage power generators from a practical application viewpoint, along with a specially-designed high-voltage transformer and its dynamic circuit modeling considering iron and copper loss resistances. An effective method to take advantage of the harmful parasitic resonant circuit parameters of the high-voltage high-frequency transformers which are used in three typical resonant tank circuit topologies and their output voltage performances in both the steady and dynamic-states are comparatively discussed. The dynamic and steady-state characteristics of these resonant power converters are evaluated on the basis of computer simulation results under the conditions of wide allowable load ranges used in actual X-ray high-voltage DC power generators.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122793979","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 : 1995-03-05DOI: 10.1109/APEC.1995.468979
J. Bell, R. Nelms, M. Shepherd
Electromechanical actuators are being examined as a replacement for the hydraulic systems used in thrust vector control and propellant control valves on space vehicles. The flow of energy from the source to the load in these high power electromechanical systems is controlled via a three-phase inverter. This paper presents an investigation into and design of a zero-voltage switched three-phase inverter for utilization in an electromechanical actuator system. The operation of this inverter is described and design equations are developed. Experimental results from a 5 HP prototype are presented.<>
{"title":"Design of a ZVS PWM inverter for a brushless DC motor in an EMA application","authors":"J. Bell, R. Nelms, M. Shepherd","doi":"10.1109/APEC.1995.468979","DOIUrl":"https://doi.org/10.1109/APEC.1995.468979","url":null,"abstract":"Electromechanical actuators are being examined as a replacement for the hydraulic systems used in thrust vector control and propellant control valves on space vehicles. The flow of energy from the source to the load in these high power electromechanical systems is controlled via a three-phase inverter. This paper presents an investigation into and design of a zero-voltage switched three-phase inverter for utilization in an electromechanical actuator system. The operation of this inverter is described and design equations are developed. Experimental results from a 5 HP prototype are presented.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122239099","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 : 1995-03-05DOI: 10.1109/APEC.1995.468958
A. Rozman, K.J. Fellhoelter
Integrated circuits for next generation computer systems subject the power subsystem to extremely large and fast load step transients, with allowable peak voltage deviations of typically less than two percent. These requirements pose a difficult problem for board level designers and are one of the major drivers for distributed power architectures. In this paper, the problem of maintaining tight regulation throughout the transient is examined, and circuit techniques are presented for its solution.<>
{"title":"Circuit considerations for fast, sensitive, low-voltage loads in a distributed power system","authors":"A. Rozman, K.J. Fellhoelter","doi":"10.1109/APEC.1995.468958","DOIUrl":"https://doi.org/10.1109/APEC.1995.468958","url":null,"abstract":"Integrated circuits for next generation computer systems subject the power subsystem to extremely large and fast load step transients, with allowable peak voltage deviations of typically less than two percent. These requirements pose a difficult problem for board level designers and are one of the major drivers for distributed power architectures. In this paper, the problem of maintaining tight regulation throughout the transient is examined, and circuit techniques are presented for its solution.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129809564","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 : 1995-03-05DOI: 10.1109/APEC.1995.469027
C. Donohue, F. M. Miles
This paper explores the inherently difficult task of implementing total quality management in a marketing and sales organization and more importantly, getting the marketing organization to take a leadership role in the TQM effort.<>
{"title":"Total quality management in the marketing organization","authors":"C. Donohue, F. M. Miles","doi":"10.1109/APEC.1995.469027","DOIUrl":"https://doi.org/10.1109/APEC.1995.469027","url":null,"abstract":"This paper explores the inherently difficult task of implementing total quality management in a marketing and sales organization and more importantly, getting the marketing organization to take a leadership role in the TQM effort.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132708581","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 : 1995-03-05DOI: 10.1109/APEC.1995.469107
A. Sabol, M. Heisig
With the advent of the "Green" initiative combined with existing and pending government legislation, manufacturers in consumer, industrial, and appliance industries are now becoming more aware and concerned about the need to make their end products more environmentally safe and more energy efficient. This paper describes an effort by AT&T to develop a single chip power integrated circuit which allows a conventional single phase brushless DC motor to be driven directly off the 110 volt AC main. With this chip, the advantages of low voltage brushless DC motors can now be realized, advantages like improved efficiency, ease of speed control, and long life, while direct two wire interface to the AC main can be maintained to make the conversion from AC motors to brushless DC motors virtually invisible to the user.<>
{"title":"New single chip high voltage power IC allows low voltage brushless DC motors to interface directly to AC mains","authors":"A. Sabol, M. Heisig","doi":"10.1109/APEC.1995.469107","DOIUrl":"https://doi.org/10.1109/APEC.1995.469107","url":null,"abstract":"With the advent of the \"Green\" initiative combined with existing and pending government legislation, manufacturers in consumer, industrial, and appliance industries are now becoming more aware and concerned about the need to make their end products more environmentally safe and more energy efficient. This paper describes an effort by AT&T to develop a single chip power integrated circuit which allows a conventional single phase brushless DC motor to be driven directly off the 110 volt AC main. With this chip, the advantages of low voltage brushless DC motors can now be realized, advantages like improved efficiency, ease of speed control, and long life, while direct two wire interface to the AC main can be maintained to make the conversion from AC motors to brushless DC motors virtually invisible to the user.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133074826","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 : 1995-03-05DOI: 10.1109/APEC.1995.469102
G. Levin
There are a number of post regulator methods for power control in a multiple output power regulator. The most popular in the mid to high power range are magnetic amplifiers. The semiconductor equivalent of the magnetic amplifier is the secondary side post regulator (SSPR). SSPR has many advantages over the magnetic amplifier, especially in mid power, high frequency converters. This paper introduces a new SSPR controller, and demonstrates its performance with a forward converter design example.<>
{"title":"A new secondary side post regulator (SSPR) PWM controller for multiple output power supplies","authors":"G. Levin","doi":"10.1109/APEC.1995.469102","DOIUrl":"https://doi.org/10.1109/APEC.1995.469102","url":null,"abstract":"There are a number of post regulator methods for power control in a multiple output power regulator. The most popular in the mid to high power range are magnetic amplifiers. The semiconductor equivalent of the magnetic amplifier is the secondary side post regulator (SSPR). SSPR has many advantages over the magnetic amplifier, especially in mid power, high frequency converters. This paper introduces a new SSPR controller, and demonstrates its performance with a forward converter design example.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114065651","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 : 1995-03-05DOI: 10.1109/APEC.1995.469075
Ju Zhang, G. Skutt, F. Lee
An automated high-frequency core loss measurement method based on the use of an impedance analyzer was discussed by P.M. Gradzki and F.C. Lee (see HFPC proc., p.108-15, 1991). This measurement setup is convenient to use in high-frequency core characterization, but has certain limitations for some types of core loss measurement. Specifically, additional attention must be paid in order to obtain reliable results for core loss characteristics under DC bias, low frequency core loss measurement, and core loss measurement of low permeability materials. This paper addresses these issues and presents an error analysis of the use of a parallel capacitor for power factor compensation.<>
{"title":"Some practical issues related to core loss measurement using impedance analyzer approach","authors":"Ju Zhang, G. Skutt, F. Lee","doi":"10.1109/APEC.1995.469075","DOIUrl":"https://doi.org/10.1109/APEC.1995.469075","url":null,"abstract":"An automated high-frequency core loss measurement method based on the use of an impedance analyzer was discussed by P.M. Gradzki and F.C. Lee (see HFPC proc., p.108-15, 1991). This measurement setup is convenient to use in high-frequency core characterization, but has certain limitations for some types of core loss measurement. Specifically, additional attention must be paid in order to obtain reliable results for core loss characteristics under DC bias, low frequency core loss measurement, and core loss measurement of low permeability materials. This paper addresses these issues and presents an error analysis of the use of a parallel capacitor for power factor compensation.<<ETX>>","PeriodicalId":335367,"journal":{"name":"Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115249851","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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