K. Matsui, I. Yamamoto, K. Tsuboi, K. Iwata, S. Muto, M. Watanabe, F. Ueda
A forward power converter with reduced harmonics for the input supply current is proposed. In this converter, the input capacitance is reduced, so that lower-order harmonics such as the fifth and the seventh can be largely reduced by about 20% to 40%. However, the DC link voltage ripple is increased in the proposed circuit. Such characteristics have been improved by a ripple compensation circuit consisting of the feedforward circuit. One can also obtain a noticeable harmonic elimination effect for the use of parallel connection between the proposed circuits and the conventional ones.<>
{"title":"A reduction method of harmonic currents in power systems generated by switching regulators","authors":"K. Matsui, I. Yamamoto, K. Tsuboi, K. Iwata, S. Muto, M. Watanabe, F. Ueda","doi":"10.1109/IAS.1993.299238","DOIUrl":"https://doi.org/10.1109/IAS.1993.299238","url":null,"abstract":"A forward power converter with reduced harmonics for the input supply current is proposed. In this converter, the input capacitance is reduced, so that lower-order harmonics such as the fifth and the seventh can be largely reduced by about 20% to 40%. However, the DC link voltage ripple is increased in the proposed circuit. Such characteristics have been improved by a ripple compensation circuit consisting of the feedforward circuit. One can also obtain a noticeable harmonic elimination effect for the use of parallel connection between the proposed circuits and the conventional ones.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126974109","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}
Recognizing the limitations of existing test equipment the Canadian Standards Association developed a computer-aided lamp temperature measuring apparatus. This equipment incorporates a simple approach to detecting thermal characteristics of tungsten filament lamps. The key element of this equipment is a data acquisition system that compiles measured test data and selects the maximum temperatures. The test data can be used to develop an empirical equation for determining the maximum temperatures of new tungsten filament lamps. This equation will compute maximum permissible profile temperature limits for new lamps with different bulb size or different lamp wattages.<>
{"title":"Computer-aided lamp temperature measuring apparatus and maximum lamp profile temperature","authors":"D. Li","doi":"10.1109/IAS.1993.299208","DOIUrl":"https://doi.org/10.1109/IAS.1993.299208","url":null,"abstract":"Recognizing the limitations of existing test equipment the Canadian Standards Association developed a computer-aided lamp temperature measuring apparatus. This equipment incorporates a simple approach to detecting thermal characteristics of tungsten filament lamps. The key element of this equipment is a data acquisition system that compiles measured test data and selects the maximum temperatures. The test data can be used to develop an empirical equation for determining the maximum temperatures of new tungsten filament lamps. This equation will compute maximum permissible profile temperature limits for new lamps with different bulb size or different lamp wattages.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114438200","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}
The authors describe a control scheme incorporated in the voltage-fed full-bridge series resonant high-frequency inverter using static induction high power transistors (SITs), which is based on a load-adaptive variable frequency modulated phase-shift PWM (pulse-width modulation) control strategy. The operating principle of the load-adaptive variable frequency PWM series resonant inverter system with a new control scheme is described along with its operating characteristics in steady state. The 20 kW-200 kHz prototype inverter system suitable for induction heating in industry is demonstrated, including a specially designed power transformer. SIT stacks with a water cooling system, and a building-block assembly for high-power use. Experimental results and simulation results are presented. Finally, an improved variable frequency PWM series resonant inverter topology incorporating partially inserted capacitive lossless snubbers is proposed for soft switching and compared with the inverter mentioned above.<>
{"title":"High-frequency inverter with phase-shifted PWM and load-adaptive PFM control strategy for industrial induction-heating","authors":"S. Nagai, H. Nagura, M. Nakaoka, A. Okuno","doi":"10.1109/IAS.1993.299167","DOIUrl":"https://doi.org/10.1109/IAS.1993.299167","url":null,"abstract":"The authors describe a control scheme incorporated in the voltage-fed full-bridge series resonant high-frequency inverter using static induction high power transistors (SITs), which is based on a load-adaptive variable frequency modulated phase-shift PWM (pulse-width modulation) control strategy. The operating principle of the load-adaptive variable frequency PWM series resonant inverter system with a new control scheme is described along with its operating characteristics in steady state. The 20 kW-200 kHz prototype inverter system suitable for induction heating in industry is demonstrated, including a specially designed power transformer. SIT stacks with a water cooling system, and a building-block assembly for high-power use. Experimental results and simulation results are presented. Finally, an improved variable frequency PWM series resonant inverter topology incorporating partially inserted capacitive lossless snubbers is proposed for soft switching and compared with the inverter mentioned above.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121919701","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}
The performance and cost-effectiveness of compact fluorescent lighting systems were assessed for five building types. While several commonly used performance criteria were identified in advance, other performance attributes only became apparent during the study. Fixture and lamp costs are substantially higher than for incandescent systems, but are offset by much longer lamp life and greater efficacy. Comparative life-cycle cost estimates were developed. The balance between increased capital and decreased operating costs varies with electricity tariffs, labor costs for replacing burned-out lamps, and other factors. Compact fluorescents may be a desirable choice for other reasons such as reduced vulnerability to electricity price increases, reduced loads on emergency power systems, reduced temperatures in areas inadequately cooled by air conditioning systems, simplification of lamp inventories, reduced heat damage to exit sign enclosures, and prevention of inadvertent gross overlamping.<>
{"title":"Field performance of compact fluorescent systems","authors":"J. Love","doi":"10.1109/IAS.1993.299185","DOIUrl":"https://doi.org/10.1109/IAS.1993.299185","url":null,"abstract":"The performance and cost-effectiveness of compact fluorescent lighting systems were assessed for five building types. While several commonly used performance criteria were identified in advance, other performance attributes only became apparent during the study. Fixture and lamp costs are substantially higher than for incandescent systems, but are offset by much longer lamp life and greater efficacy. Comparative life-cycle cost estimates were developed. The balance between increased capital and decreased operating costs varies with electricity tariffs, labor costs for replacing burned-out lamps, and other factors. Compact fluorescents may be a desirable choice for other reasons such as reduced vulnerability to electricity price increases, reduced loads on emergency power systems, reduced temperatures in areas inadequately cooled by air conditioning systems, simplification of lamp inventories, reduced heat damage to exit sign enclosures, and prevention of inadvertent gross overlamping.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"48 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122589813","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}
Current and emerging technologies for lamps based on solid-state semiconductor materials are reviewed. Recent advances include high-performance light-emitting diodes (LEDs) (efficiencies of 15% and luminous intensities of 15 cd), practical blue, multicolor, and white light sources, superluminescent diodes with characteristics intermediate between LEDs and diode lasers, and novel light-emitted materials such as silicon and conductive polymers. The potential of this class of light source for specific niche applications is also reviewed.<>
{"title":"Advanced solid-state semiconductor light sources","authors":"S. B. Peralta, H. Ruda","doi":"10.1109/IAS.1993.299201","DOIUrl":"https://doi.org/10.1109/IAS.1993.299201","url":null,"abstract":"Current and emerging technologies for lamps based on solid-state semiconductor materials are reviewed. Recent advances include high-performance light-emitting diodes (LEDs) (efficiencies of 15% and luminous intensities of 15 cd), practical blue, multicolor, and white light sources, superluminescent diodes with characteristics intermediate between LEDs and diode lasers, and novel light-emitted materials such as silicon and conductive polymers. The potential of this class of light source for specific niche applications is also reviewed.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122871947","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}
The author describes the main features of a distributed control system for industrial continuous processes and, in particular, for applications involving hot rolling mills for wire rods, round bars, and profiles. In rolling mills, a very good tension and loop control increases the plant efficiency, avoids cobbling, and allows a better material quality. Not only a good measurement of process quantities but also appropriate signal processing and good synchronized control algorithms are necessary. Results showing the control performance of the system and tension control in less than a 300 ms stand-distance are reported. R&D results using cycloconverter fed induction motors with field-oriented control are discussed. The first such system was installed for the revamping of a 15 stands mill and has been successfully operating since Sept. 1990; an increase of productivity of over 18% has been achieved.<>
{"title":"Control strategies for rolling mills","authors":"A. Pollmann","doi":"10.1109/IAS.1993.299220","DOIUrl":"https://doi.org/10.1109/IAS.1993.299220","url":null,"abstract":"The author describes the main features of a distributed control system for industrial continuous processes and, in particular, for applications involving hot rolling mills for wire rods, round bars, and profiles. In rolling mills, a very good tension and loop control increases the plant efficiency, avoids cobbling, and allows a better material quality. Not only a good measurement of process quantities but also appropriate signal processing and good synchronized control algorithms are necessary. Results showing the control performance of the system and tension control in less than a 300 ms stand-distance are reported. R&D results using cycloconverter fed induction motors with field-oriented control are discussed. The first such system was installed for the revamping of a 15 stands mill and has been successfully operating since Sept. 1990; an increase of productivity of over 18% has been achieved.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"29 3-4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127126042","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}
Formulation of the equations of motion for brushless motors in the compact form is considered. It is demonstrated that, by incorporating a combination of time scaling and linear state transformations, compact representations for the equations of motion can be obtained. It is shown that, by nondimensionalizing the equations of motion for brushless motors, one can significantly reduce the number of parameters in the model, and thus significantly reduce the complexity associated with the dynamic analysis procedure. Using the compact representations, it is demonstrated that the systems under investigation, subject to constant inputs and loads, possess multiple equilibrium states which characterize the global stability. As a by-product of the proposed scheme, an equivalence relationship between brushless motors and the Lorenz system is presented.<>
{"title":"Dynamic analysis of brushless motors based on compact representations of the equations of motion","authors":"N. Hemati","doi":"10.1109/IAS.1993.298903","DOIUrl":"https://doi.org/10.1109/IAS.1993.298903","url":null,"abstract":"Formulation of the equations of motion for brushless motors in the compact form is considered. It is demonstrated that, by incorporating a combination of time scaling and linear state transformations, compact representations for the equations of motion can be obtained. It is shown that, by nondimensionalizing the equations of motion for brushless motors, one can significantly reduce the number of parameters in the model, and thus significantly reduce the complexity associated with the dynamic analysis procedure. Using the compact representations, it is demonstrated that the systems under investigation, subject to constant inputs and loads, possess multiple equilibrium states which characterize the global stability. As a by-product of the proposed scheme, an equivalence relationship between brushless motors and the Lorenz system is presented.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"296 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131448558","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}
A simple model for calculating the stator surface vibration of a unipolar four-phase hybrid stepping motor is presented. The approximate radial magnetic force per pole is calculated using a permeance model and its equivalent magnetic circuit. Based on the calculated radial magnetic forces and the measured stator mobility values, the radial vibration spectrum on top of a stator pole is estimated. The results show a reasonable agreement between the calculated and measured radial vibration levels. This verifies the analytical approach which, due to the special structure and excitation of the motor, is significantly different from the technique commonly employed for vibration study of induction machines.<>
{"title":"A simple model to calculate the stator radial vibration of a hybrid stepping motor","authors":"E. So, R.G.D. Williams, S.J. Yang","doi":"10.1109/IAS.1993.298913","DOIUrl":"https://doi.org/10.1109/IAS.1993.298913","url":null,"abstract":"A simple model for calculating the stator surface vibration of a unipolar four-phase hybrid stepping motor is presented. The approximate radial magnetic force per pole is calculated using a permeance model and its equivalent magnetic circuit. Based on the calculated radial magnetic forces and the measured stator mobility values, the radial vibration spectrum on top of a stator pole is estimated. The results show a reasonable agreement between the calculated and measured radial vibration levels. This verifies the analytical approach which, due to the special structure and excitation of the motor, is significantly different from the technique commonly employed for vibration study of induction machines.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122925601","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}
The utility of resonant inverter topologies in electronic ballasts for high-pressure sodium (HPS) lamps is examined. The three basic types of resonant inverters, series-loaded, parallel-loaded, and series-parallel-loaded, are compared for their applicability in electronic ballasts. A parallel-loaded resonant (PLR) inverter operating at a constant switching frequency is selected because of the high voltage gains possible. As a result, it is not necessary to use a transformer to provide enough voltage to start the HPS lamp from a low-voltage DC source such as that obtained from rectification of 120 V AC source. A PLR inverter was designed based on this analysis. A computer simulation of this design verified inverter operation when driving an HPS lamp. A laboratory prototype was then constructed and found to operate satisfactorily.<>
{"title":"A comparison of resonant inverter topologies for HPS lamp ballasts","authors":"R. Nelms, Tim D. Jones, M. C. Cosby","doi":"10.1109/IAS.1993.299200","DOIUrl":"https://doi.org/10.1109/IAS.1993.299200","url":null,"abstract":"The utility of resonant inverter topologies in electronic ballasts for high-pressure sodium (HPS) lamps is examined. The three basic types of resonant inverters, series-loaded, parallel-loaded, and series-parallel-loaded, are compared for their applicability in electronic ballasts. A parallel-loaded resonant (PLR) inverter operating at a constant switching frequency is selected because of the high voltage gains possible. As a result, it is not necessary to use a transformer to provide enough voltage to start the HPS lamp from a low-voltage DC source such as that obtained from rectification of 120 V AC source. A PLR inverter was designed based on this analysis. A computer simulation of this design verified inverter operation when driving an HPS lamp. A laboratory prototype was then constructed and found to operate satisfactorily.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123987233","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}
Various aspects of corona discharge treatment are reviewed. Particular attention is given to the Lissajous power measurement procedure; the significance of quartz, ceramic, or rubber as the dielectric in corona treaters; watt density considerations; and stabilizers and fatty acids.<>
{"title":"Corona discharge treatment","authors":"P. Sherman","doi":"10.1109/IAS.1993.299063","DOIUrl":"https://doi.org/10.1109/IAS.1993.299063","url":null,"abstract":"Various aspects of corona discharge treatment are reviewed. Particular attention is given to the Lissajous power measurement procedure; the significance of quartz, ceramic, or rubber as the dielectric in corona treaters; watt density considerations; and stabilizers and fatty acids.<<ETX>>","PeriodicalId":345027,"journal":{"name":"Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124005955","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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