Pub Date : 2004-12-27DOI: 10.1109/LPEL.2004.840256
M.M. Islam;D.R. Allee;S. Konasani;A.A. Rodriguez
A new control algorithm with improved regulation is presented for a switching dc buck converter. The controller is realized with hardware description language (HDL) and can be implemented in any process. The controller uses four decision levels, combines pulse frequency modulation (PFM), pulse width modulation (PWM), and uses dithering for improved regulation. The controller is prototyped on a field programmable gate array (FPGA) and experimental results show good performance over input and load disturbances. Importantly, the controller does not require high resolution analog-to-digital conversion for signal processing, and also does not require fast digital clocking. This controller has significant potential to be widely used in industrial applications where cost and design time are of great concern.
{"title":"A low-cost digital controller for a switching DC converter with improved voltage regulation","authors":"M.M. Islam;D.R. Allee;S. Konasani;A.A. Rodriguez","doi":"10.1109/LPEL.2004.840256","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840256","url":null,"abstract":"A new control algorithm with improved regulation is presented for a switching dc buck converter. The controller is realized with hardware description language (HDL) and can be implemented in any process. The controller uses four decision levels, combines pulse frequency modulation (PFM), pulse width modulation (PWM), and uses dithering for improved regulation. The controller is prototyped on a field programmable gate array (FPGA) and experimental results show good performance over input and load disturbances. Importantly, the controller does not require high resolution analog-to-digital conversion for signal processing, and also does not require fast digital clocking. This controller has significant potential to be widely used in industrial applications where cost and design time are of great concern.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"121-124"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840256","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350897","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 : 2004-12-27DOI: 10.1109/LPEL.2004.841494
B.A. Welchko;T.M. Jahns;T.A. Lipo
This work investigates methods to interrupt the phase currents induced when interior permanent magnet (IPM) machine drives suffer short-circuit or uncontrolled generator mode faults. A fault-tolerant silicon switch is proposed in which the antiparallel diode in a reverse-blocking inverter switch is replaced by a thyristor. A reduced-parts-count fault-interrupting topology is also proposed which consists of delta-connected thyristors inserted at the center star point of wye-connected IPM machine stator windings. Control of the proposed reduced-parts-count fault-tolerant drive is discussed and simulation results are presented to verify operation of the proposed topology.
{"title":"Fault interrupting methods and topologies for interior PM machine drives","authors":"B.A. Welchko;T.M. Jahns;T.A. Lipo","doi":"10.1109/LPEL.2004.841494","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841494","url":null,"abstract":"This work investigates methods to interrupt the phase currents induced when interior permanent magnet (IPM) machine drives suffer short-circuit or uncontrolled generator mode faults. A fault-tolerant silicon switch is proposed in which the antiparallel diode in a reverse-blocking inverter switch is replaced by a thyristor. A reduced-parts-count fault-interrupting topology is also proposed which consists of delta-connected thyristors inserted at the center star point of wye-connected IPM machine stator windings. Control of the proposed reduced-parts-count fault-tolerant drive is discussed and simulation results are presented to verify operation of the proposed topology.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"139-143"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841494","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350892","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 : 2004-12-27DOI: 10.1109/LPEL.2004.840739
P. Midya;K. Haddad;M. Miller
A cascade of buck and boost converter is presented here. The control operates in a manner that the converter is either in buck or boost (BOB) mode on a cycle by cycle basis. It transitions between the modes seamlessly to provide a tracking power conversion function for modulating the power supply of a variable envelope radio frequency (RF) power amplifier. The control algorithm and its implementation using switched capacitor circuits is described. Simulation and measured experimental results including converter efficiency, tracking accuracy, and spectrum at the output of the RF power amplifier are provided. This control technique allows seamless transition between the buck and boost modes while tracking RF envelopes with bandwidth greater than 100 kHz, and maintaining extreme accuracy and extremely low ripple. The efficiency of this converter operating at 1.68 MHz is close to 90% over a wide range of conversion ratios. The area of the power converter is extremely small allowing this to be integrated into a cellular telephone. The controller was integrated as part of a larger power management IC as well as a discrete IC.
{"title":"Buck or boost tracking power converter","authors":"P. Midya;K. Haddad;M. Miller","doi":"10.1109/LPEL.2004.840739","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840739","url":null,"abstract":"A cascade of buck and boost converter is presented here. The control operates in a manner that the converter is either in buck or boost (BOB) mode on a cycle by cycle basis. It transitions between the modes seamlessly to provide a tracking power conversion function for modulating the power supply of a variable envelope radio frequency (RF) power amplifier. The control algorithm and its implementation using switched capacitor circuits is described. Simulation and measured experimental results including converter efficiency, tracking accuracy, and spectrum at the output of the RF power amplifier are provided. This control technique allows seamless transition between the buck and boost modes while tracking RF envelopes with bandwidth greater than 100 kHz, and maintaining extreme accuracy and extremely low ripple. The efficiency of this converter operating at 1.68 MHz is close to 90% over a wide range of conversion ratios. The area of the power converter is extremely small allowing this to be integrated into a cellular telephone. The controller was integrated as part of a larger power management IC as well as a discrete IC.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"131-134"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840739","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350895","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 : 2004-12-27DOI: 10.1109/LPEL.2004.841941
Provides a listing of current society officers.
提供当前协会官员的列表。
{"title":"IEEE Power Electronics Society Information","authors":"","doi":"10.1109/LPEL.2004.841941","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841941","url":null,"abstract":"Provides a listing of current society officers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"c3-c3"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841941","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350945","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 : 2004-12-27DOI: 10.1109/LPEL.2004.841940
Provides a listing of current society officers.
提供当前协会官员的列表。
{"title":"IEEE Power Electronics Letters publication information","authors":"","doi":"10.1109/LPEL.2004.841940","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841940","url":null,"abstract":"Provides a listing of current society officers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"c2-c2"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841940","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350949","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 : 2004-12-27DOI: 10.1109/LPEL.2004.840135
Jung-Wook Park;R.G. Harley
This work describes a secondary control scheme of a series reactive compensator for a power system based on a single voltage-source pulse-width-modulated (PWM) inverter. The controllable capacitive reactance can be used as a supplementary control variable for the secondary (external) controller (SC) of a series capacitive reactance compensator to improve the dynamic transient and damping performances of the power system. From the viewpoint of agent-based global dynamic optimization of a system, the selection and use of suitable input signals for the SC are investigated. Detailed simulation results show that the SC with local feedback loop (LFL) has a powerful control performance; however, it requires the controllable compensation for a reference change due to different operating conditions. On the other hand, the SC with global feedback loop (GFL) avoids the need of reference compensation; moreover, its dynamic control performance is improved when the dual inputs (frequency and active power signal) are used, compared to when only the frequency is used as an input signal.
{"title":"Secondary control for a series reactive compensator based on a voltage-source PWM inverter","authors":"Jung-Wook Park;R.G. Harley","doi":"10.1109/LPEL.2004.840135","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840135","url":null,"abstract":"This work describes a secondary control scheme of a series reactive compensator for a power system based on a single voltage-source pulse-width-modulated (PWM) inverter. The controllable capacitive reactance can be used as a supplementary control variable for the secondary (external) controller (SC) of a series capacitive reactance compensator to improve the dynamic transient and damping performances of the power system. From the viewpoint of agent-based global dynamic optimization of a system, the selection and use of suitable input signals for the SC are investigated. Detailed simulation results show that the SC with local feedback loop (LFL) has a powerful control performance; however, it requires the controllable compensation for a reference change due to different operating conditions. On the other hand, the SC with global feedback loop (GFL) avoids the need of reference compensation; moreover, its dynamic control performance is improved when the dual inputs (frequency and active power signal) are used, compared to when only the frequency is used as an input signal.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"117-120"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350951","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 : 2004-12-27DOI: 10.1109/LPEL.2004.841944
This index covers all technical items - papers, correspondence, reviews, etc. - that appeared in this periodical during the year, and items from previous years that were commented upon or corrected in this year. Departments and other items may also be covered if they have been judged to have archival value. The Author Index contains the primary entry for each item, listed under the first author's name. The primary entry includes the coauthors' names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, month, and inclusive pagination. The Subject Index contains entries describing the item under all appropriate subject headings, plus the first author's name, the publication abbreviation, month, and year, and inclusive pages. Note that the item title is found only under the primary entry in the Author Index.
{"title":"2004 Index","authors":"","doi":"10.1109/LPEL.2004.841944","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841944","url":null,"abstract":"This index covers all technical items - papers, correspondence, reviews, etc. - that appeared in this periodical during the year, and items from previous years that were commented upon or corrected in this year. Departments and other items may also be covered if they have been judged to have archival value. The Author Index contains the primary entry for each item, listed under the first author's name. The primary entry includes the coauthors' names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, month, and inclusive pagination. The Subject Index contains entries describing the item under all appropriate subject headings, plus the first author's name, the publication abbreviation, month, and year, and inclusive pages. Note that the item title is found only under the primary entry in the Author Index.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"148-152"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841944","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350944","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 : 2004-12-27DOI: 10.1109/LPEL.2004.841493
P. Athalye;D. Maksimovic;R. Erickson
A variable-frequency predictive digital control method for the inductor current in switched-mode converters is introduced in this letter. This method is predictive in nature because the transistor off-time required for achieving the target current is calculated ahead of time. The transistor on-time is kept constant, which results in variable switching frequency. The control laws for continuous and discontinuous modes of operation of the three basic converters are derived. Stability and robustness criteria are presented. The variable-frequency predictive control obviates the need for current-loop compensation and has the advantages of single-cycle response and relatively simple implementation. The control method is demonstrated in a digital signal processor (DSP) for a boost power factor corrector (PFC), which shows excellent current tracking and a very low harmonic distortion of the line current.
{"title":"Variable-frequency predictive digital current mode control","authors":"P. Athalye;D. Maksimovic;R. Erickson","doi":"10.1109/LPEL.2004.841493","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841493","url":null,"abstract":"A variable-frequency predictive digital control method for the inductor current in switched-mode converters is introduced in this letter. This method is predictive in nature because the transistor off-time required for achieving the target current is calculated ahead of time. The transistor on-time is kept constant, which results in variable switching frequency. The control laws for continuous and discontinuous modes of operation of the three basic converters are derived. Stability and robustness criteria are presented. The variable-frequency predictive control obviates the need for current-loop compensation and has the advantages of single-cycle response and relatively simple implementation. The control method is demonstrated in a digital signal processor (DSP) for a boost power factor corrector (PFC), which shows excellent current tracking and a very low harmonic distortion of the line current.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"113-116"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841493","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350950","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 : 2004-11-21DOI: 10.1109/ICPST.2004.1460272
Poh Chiang Loh, D. Vilathgamuwa, Seng Khai Tang, H.L. Long
This letter presents the implementation and control of a high voltage dynamic voltage restorer (HVDVR) for use in power distribution network to compensate for sags in utility voltages. The proposed HVDVR is implemented using a multilevel inverter topology with isolated DC energy storage, allowing the direct connection of the HVDVR to the distribution network without using a bulky and costly series injection transformer. A control algorithm, incorporating P+resonant and Posicast compensators, is also presented for controlling the HVDVR with perfect reference voltage tracking and effective damping of transient voltage oscillations at the instant of sag compensation. Finally, simulation results are presented to verify the performance of the proposed multilevel HVDVR.
{"title":"Multilevel dynamic voltage restorer","authors":"Poh Chiang Loh, D. Vilathgamuwa, Seng Khai Tang, H.L. Long","doi":"10.1109/ICPST.2004.1460272","DOIUrl":"https://doi.org/10.1109/ICPST.2004.1460272","url":null,"abstract":"This letter presents the implementation and control of a high voltage dynamic voltage restorer (HVDVR) for use in power distribution network to compensate for sags in utility voltages. The proposed HVDVR is implemented using a multilevel inverter topology with isolated DC energy storage, allowing the direct connection of the HVDVR to the distribution network without using a bulky and costly series injection transformer. A control algorithm, incorporating P+resonant and Posicast compensators, is also presented for controlling the HVDVR with perfect reference voltage tracking and effective damping of transient voltage oscillations at the instant of sag compensation. Finally, simulation results are presented to verify the performance of the proposed multilevel HVDVR.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"19 1","pages":"125-130"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85943620","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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