Pub Date : 1996-06-23DOI: 10.1109/PESC.1996.548769
V. Lovati, M. Marchesoni, M. Oberti, P. Segarich
A sensorless, stator flux oriented asynchronous motor drive has been realized, by using a low-cost, single chip microcontroller. A motor state observer has been implemented, which showed excellent performances, particularly at low speed operation. Two different experimental realizations have been developed, with rated powers equal to about 1.5 kW and 30 kW respectively, and good results have been obtained in both cases. The theoretical approach, the main design choices and the most significant experimental results are presented.
{"title":"Implementation of a sensorless stator flux oriented asynchronous motor drive with high performances at low-speed operation","authors":"V. Lovati, M. Marchesoni, M. Oberti, P. Segarich","doi":"10.1109/PESC.1996.548769","DOIUrl":"https://doi.org/10.1109/PESC.1996.548769","url":null,"abstract":"A sensorless, stator flux oriented asynchronous motor drive has been realized, by using a low-cost, single chip microcontroller. A motor state observer has been implemented, which showed excellent performances, particularly at low speed operation. Two different experimental realizations have been developed, with rated powers equal to about 1.5 kW and 30 kW respectively, and good results have been obtained in both cases. The theoretical approach, the main design choices and the most significant experimental results are presented.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"15 1","pages":"1427-1433 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89977653","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 : 1996-06-23DOI: 10.1109/PESC.1996.548570
Po-Wa Lee, C. Pollock
A converter topology for two phase, bipolar drive hybrid stepping motors using only six power switches is proposed. The two motor phase windings are connected in series to form three nodes so that only six switches are required for controlling the bi-directional current flow in the windings. The control of current in each winding is coupled by the common node. Detailed design of the control strategy which allows PWM current regulation in each phase is developed. The power converter performance is assessed analytically and the proposed system is demonstrated by both simulation and experimental results.
{"title":"Shared switch converter topology for a two phase bipolar drive hybrid stepping motor","authors":"Po-Wa Lee, C. Pollock","doi":"10.1109/PESC.1996.548570","DOIUrl":"https://doi.org/10.1109/PESC.1996.548570","url":null,"abstract":"A converter topology for two phase, bipolar drive hybrid stepping motors using only six power switches is proposed. The two motor phase windings are connected in series to form three nodes so that only six switches are required for controlling the bi-directional current flow in the windings. The control of current in each winding is coupled by the common node. Detailed design of the control strategy which allows PWM current regulation in each phase is developed. The power converter performance is assessed analytically and the proposed system is demonstrated by both simulation and experimental results.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"103 1","pages":"127-133 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87908950","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 : 1996-06-23DOI: 10.1109/PESC.1996.548777
J. Calvente, R. Giral, J. Hernanz, R. Leyva
In this paper, a sliding-mode control technique is used to implement the control loop in a switching amplifier stage based on two step-down buck power converters operating in push-pull mode. By means of a discontinuity surface that uses the four state variables of the power converter, the authors obtain a large bandwidth suitable for audio applications. The presence of a first order compensating network assures a perfect tracking of the input signal.
{"title":"Push-pull switching power amplifier with sliding-mode control","authors":"J. Calvente, R. Giral, J. Hernanz, R. Leyva","doi":"10.1109/PESC.1996.548777","DOIUrl":"https://doi.org/10.1109/PESC.1996.548777","url":null,"abstract":"In this paper, a sliding-mode control technique is used to implement the control loop in a switching amplifier stage based on two step-down buck power converters operating in push-pull mode. By means of a discontinuity surface that uses the four state variables of the power converter, the authors obtain a large bandwidth suitable for audio applications. The presence of a first order compensating network assures a perfect tracking of the input signal.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"5 1","pages":"1484-1487 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87401110","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 : 1996-06-23DOI: 10.1109/PESC.1996.548641
G. Busatto, O. Fioretto, A. Patti
The failure of power MOSFET during reverse recovery of its intrinsic drain-source diode is experimentally studied by means of a nondestructive tester. The analysis is based on the observation of the waveforms during the failure which shows the evidence of the activation of parasitic bipolar transistor. This paper advances the hypothesis that the failure mechanism is strictly related to how this transistor is being activated during reverse recovery. In particular, for higher values of dI/sub D//dt, the bipolar parasitic transistor on small area of the chip is activated at the early beginning voltage rise. Device failure is then caused by the second breakdown of this transistor which takes place during its turn-off.
{"title":"Nondestructive testing of power MOSFET's failures during reverse recovery of drain-source diode","authors":"G. Busatto, O. Fioretto, A. Patti","doi":"10.1109/PESC.1996.548641","DOIUrl":"https://doi.org/10.1109/PESC.1996.548641","url":null,"abstract":"The failure of power MOSFET during reverse recovery of its intrinsic drain-source diode is experimentally studied by means of a nondestructive tester. The analysis is based on the observation of the waveforms during the failure which shows the evidence of the activation of parasitic bipolar transistor. This paper advances the hypothesis that the failure mechanism is strictly related to how this transistor is being activated during reverse recovery. In particular, for higher values of dI/sub D//dt, the bipolar parasitic transistor on small area of the chip is activated at the early beginning voltage rise. Device failure is then caused by the second breakdown of this transistor which takes place during its turn-off.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"9 1","pages":"593-599 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87495018","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 : 1996-06-23DOI: 10.1109/PESC.1996.548736
R. N. D. Prado, S. A. Bonaldo, Mauro Ceretta Moreira, Dalton L. R. Vidor
This paper describes a high power factor electronic ballast for fluorescent lamps. The converter offers a high power factor and high-frequency supply to the lamp using a single switch. In spite of its simplicity, an excellent performance concerning load and supply is achieved, ensuring a sinusoidal and in-phase supply current. High power factor is achieved by using a flyback converter operating in discontinuous-conduction mode. Operating principle, design equations, control characteristics, component stress, and efficiency are presented. Experimental results have been obtained for one 40 W fluorescent lamp operating at 50 kHz switching frequency and 127 V line voltage.
{"title":"Electronic ballast with a high power factor for fluorescent lamps","authors":"R. N. D. Prado, S. A. Bonaldo, Mauro Ceretta Moreira, Dalton L. R. Vidor","doi":"10.1109/PESC.1996.548736","DOIUrl":"https://doi.org/10.1109/PESC.1996.548736","url":null,"abstract":"This paper describes a high power factor electronic ballast for fluorescent lamps. The converter offers a high power factor and high-frequency supply to the lamp using a single switch. In spite of its simplicity, an excellent performance concerning load and supply is achieved, ensuring a sinusoidal and in-phase supply current. High power factor is achieved by using a flyback converter operating in discontinuous-conduction mode. Operating principle, design equations, control characteristics, component stress, and efficiency are presented. Experimental results have been obtained for one 40 W fluorescent lamp operating at 50 kHz switching frequency and 127 V line voltage.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"7 1","pages":"1215-1220 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79222225","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 : 1996-06-23DOI: 10.1109/PESC.1996.548728
J. Asumadu, V. Johnson, N. Dogan
This paper describes a new method for the elimination of harmonics and analysis of PWM waveforms using multivariable fuzzy logic algorithms. A multivariable fuzzy system has been developed to model the nonlinear equations in the analyses of PWM waveforms, and to eliminate certain harmonics. The results show that the proposed fuzzy method introduced outperforms many numerical techniques applied to solve the nonlinear equations required in Fourier series harmonic elimination.
{"title":"Application of fuzzy logic algorithms for harmonic elimination and voltage control in a PWM waveform","authors":"J. Asumadu, V. Johnson, N. Dogan","doi":"10.1109/PESC.1996.548728","DOIUrl":"https://doi.org/10.1109/PESC.1996.548728","url":null,"abstract":"This paper describes a new method for the elimination of harmonics and analysis of PWM waveforms using multivariable fuzzy logic algorithms. A multivariable fuzzy system has been developed to model the nonlinear equations in the analyses of PWM waveforms, and to eliminate certain harmonics. The results show that the proposed fuzzy method introduced outperforms many numerical techniques applied to solve the nonlinear equations required in Fourier series harmonic elimination.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"56 1","pages":"1163-1168 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76911766","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 : 1996-06-23DOI: 10.1109/PESC.1996.548684
J. Sebastian, P. Villegas, F. Nuño, M. Hernando
A study of the two-input post-regulators is carried out in this paper. In these post-regulators, only a part of the total power undergoes a switching conversion process, whereas the remainder of the power comes up to the load directly, with no power conversion process. Due to this fact, very high efficiency is achieved. Moreover, the stress in the semiconductors and the filter size are both much lower than in standard post-regulators. Two-input post-regulators require two-output main converters. However, many converter topologies can be easily adapted to supply two output voltages with no efficiency penalty. Two-input post-regulators can be used in many power converters. Multiple-output DC-to-DC converters and AC-to-DC power factor correctors are two good examples.
{"title":"Very efficient two-input DC-to-DC switching post-regulators","authors":"J. Sebastian, P. Villegas, F. Nuño, M. Hernando","doi":"10.1109/PESC.1996.548684","DOIUrl":"https://doi.org/10.1109/PESC.1996.548684","url":null,"abstract":"A study of the two-input post-regulators is carried out in this paper. In these post-regulators, only a part of the total power undergoes a switching conversion process, whereas the remainder of the power comes up to the load directly, with no power conversion process. Due to this fact, very high efficiency is achieved. Moreover, the stress in the semiconductors and the filter size are both much lower than in standard post-regulators. Two-input post-regulators require two-output main converters. However, many converter topologies can be easily adapted to supply two output voltages with no efficiency penalty. Two-input post-regulators can be used in many power converters. Multiple-output DC-to-DC converters and AC-to-DC power factor correctors are two good examples.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"39 1","pages":"874-880 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79882973","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 : 1996-06-23DOI: 10.1109/PESC.1996.548695
A. Bunte, H. Grotstollen, P. Krafka
In this paper, a new approach to induction machine control is presented that ensures the production of maximum torque over the permitted speed range. In the first part of the paper the steady state torque capability of an induction motor with saturation air gap inductance is analysed, when voltage as well as current are limited. This maximum torque can be achieved with different control schemes. Nevertheless, the schemes differ in view of robustness and the requirements to reach the optimum. In this paper, a scheme is presented that achieves the optimum operating point in the whole field weakening region only by means of the measured values of voltage and current. This method guarantees a robust adjustment with regard to the parameter uncertainties and the variable DC link voltage.
{"title":"Field weakening of induction motors in a very wide region with regard to parameter uncertainties","authors":"A. Bunte, H. Grotstollen, P. Krafka","doi":"10.1109/PESC.1996.548695","DOIUrl":"https://doi.org/10.1109/PESC.1996.548695","url":null,"abstract":"In this paper, a new approach to induction machine control is presented that ensures the production of maximum torque over the permitted speed range. In the first part of the paper the steady state torque capability of an induction motor with saturation air gap inductance is analysed, when voltage as well as current are limited. This maximum torque can be achieved with different control schemes. Nevertheless, the schemes differ in view of robustness and the requirements to reach the optimum. In this paper, a scheme is presented that achieves the optimum operating point in the whole field weakening region only by means of the measured values of voltage and current. This method guarantees a robust adjustment with regard to the parameter uncertainties and the variable DC link voltage.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"69 1","pages":"944-950 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86108736","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 : 1996-06-23DOI: 10.1109/PESC.1996.548752
L. Cheng, R. Cheung, R. Sotudeh
This paper presents a new transformation scheme for the control of an active power-line conditioner, a power electronic device which is designed to suppress the power-line distortions caused by the nonlinear loads. Currently, the method of instantaneous power transformation is the most popular one for the active power-line conditioning control. This method uses the measurements of the power-line voltage and current to estimate the required harmonic compensation. The method requires much hardware for the measurements and many computations. The high accuracy hardware for measurements are costly and many computations can introduce truncation errors. Also, this method is sensitive to the power-line voltage measurements and may introduce control errors. A new simple transformation method is developed to overcome these difficulties. This control computes the correct harmonic compensation using the power-line current measurement only. This requires less hardware for the power-line voltages measurements and simplifies the computational processes. Unlike the traditional method, the accuracy of the new control method is not affected by the line voltage measurements, therefore, it is reliable under any power-line condition. An active power-line conditioner has been successfully developed to validate the accuracy and efficiency of the new control method. Typical test results are given in the paper.
{"title":"New transformation for efficient DSP control of active power-line conditioners","authors":"L. Cheng, R. Cheung, R. Sotudeh","doi":"10.1109/PESC.1996.548752","DOIUrl":"https://doi.org/10.1109/PESC.1996.548752","url":null,"abstract":"This paper presents a new transformation scheme for the control of an active power-line conditioner, a power electronic device which is designed to suppress the power-line distortions caused by the nonlinear loads. Currently, the method of instantaneous power transformation is the most popular one for the active power-line conditioning control. This method uses the measurements of the power-line voltage and current to estimate the required harmonic compensation. The method requires much hardware for the measurements and many computations. The high accuracy hardware for measurements are costly and many computations can introduce truncation errors. Also, this method is sensitive to the power-line voltage measurements and may introduce control errors. A new simple transformation method is developed to overcome these difficulties. This control computes the correct harmonic compensation using the power-line current measurement only. This requires less hardware for the power-line voltages measurements and simplifies the computational processes. Unlike the traditional method, the accuracy of the new control method is not affected by the line voltage measurements, therefore, it is reliable under any power-line condition. An active power-line conditioner has been successfully developed to validate the accuracy and efficiency of the new control method. Typical test results are given in the paper.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"57 1","pages":"1317-1322 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88254924","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 : 1996-06-23DOI: 10.1109/PESC.1996.548800
J. Sun, H. Grotstollen
Fast time-domain simulation of power electronic systems by using waveform-relaxation methods to reduce the simulation time is presented Algorithms for circuit partitioning, time windowing, and simulation scheduling are developed. Feasibility and advantages of applications are demonstrated by simulation results of a series resonant converter and a zero-voltage-transition PWM boost converter. The integration of waveform-relaxation techniques with averaging methods to further speed up transient simulations is also discussed.
{"title":"Fast time-domain simulation by waveform relaxation methods","authors":"J. Sun, H. Grotstollen","doi":"10.1109/PESC.1996.548800","DOIUrl":"https://doi.org/10.1109/PESC.1996.548800","url":null,"abstract":"Fast time-domain simulation of power electronic systems by using waveform-relaxation methods to reduce the simulation time is presented Algorithms for circuit partitioning, time windowing, and simulation scheduling are developed. Feasibility and advantages of applications are demonstrated by simulation results of a series resonant converter and a zero-voltage-transition PWM boost converter. The integration of waveform-relaxation techniques with averaging methods to further speed up transient simulations is also discussed.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"3 1","pages":"1634-1640 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88262272","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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