Pub Date : 2005-03-01DOI: 10.1109/LPEL.2005.845163
A. Garrigos;J.A. Carrasco;J.M. Blanes;E. Sanchis
This letter characterizes, in terms of the bandwidth and limit cycle frequency of its constituent subsystems, the sequential switching shunt series regulator -S/sup 4/R, a high-efficiency, low-mass and volume power cell devised to power the next generation of regulated power buses in telecommunication spacecrafts. Transconductance power source modeling is used to obtain linear and nonlinear models. These are used to establish a design control strategy which involves the dynamic response in large load requirements or at the end of the satellite life. Simulations and experimental results are also given to demonstrate the validity of the model.
{"title":"Modeling the sequential switching shunt series regulator","authors":"A. Garrigos;J.A. Carrasco;J.M. Blanes;E. Sanchis","doi":"10.1109/LPEL.2005.845163","DOIUrl":"https://doi.org/10.1109/LPEL.2005.845163","url":null,"abstract":"This letter characterizes, in terms of the bandwidth and limit cycle frequency of its constituent subsystems, the sequential switching shunt series regulator -S/sup 4/R, a high-efficiency, low-mass and volume power cell devised to power the next generation of regulated power buses in telecommunication spacecrafts. Transconductance power source modeling is used to obtain linear and nonlinear models. These are used to establish a design control strategy which involves the dynamic response in large load requirements or at the end of the satellite life. Simulations and experimental results are also given to demonstrate the validity of the model.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"3 1","pages":"7-13"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2005.845163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49974357","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 : 2005-03-01DOI: 10.1109/LPEL.2005.845177
M.D. Mulligan;B. Broach;T.H. Lee
The low-voltage synchronous rectifier buck topology suffers from low efficiency at light loads due to dissipation that does not scale with load current. In this paper we present a method for improving light-load efficiency in synchronous buck converters by reducing gate drive losses. We propose a new gate drive technique whereby the gate voltage swing dynamically scales with load current such that gate drive loss is traded for conduction loss. Since conduction losses scale with the square of load current, an optimal gate swing exists that, at light loads, is shown to be less than the supply voltage. Using this method we obtain a 6.25% increase in converter efficiency at a load current of 10 mA and operating at a constant switching frequency of 2 MHz.
{"title":"A constant-frequency method for improving light-load efficiency in synchronous buck converters","authors":"M.D. Mulligan;B. Broach;T.H. Lee","doi":"10.1109/LPEL.2005.845177","DOIUrl":"https://doi.org/10.1109/LPEL.2005.845177","url":null,"abstract":"The low-voltage synchronous rectifier buck topology suffers from low efficiency at light loads due to dissipation that does not scale with load current. In this paper we present a method for improving light-load efficiency in synchronous buck converters by reducing gate drive losses. We propose a new gate drive technique whereby the gate voltage swing dynamically scales with load current such that gate drive loss is traded for conduction loss. Since conduction losses scale with the square of load current, an optimal gate swing exists that, at light loads, is shown to be less than the supply voltage. Using this method we obtain a 6.25% increase in converter efficiency at a load current of 10 mA and operating at a constant switching frequency of 2 MHz.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"3 1","pages":"24-29"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2005.845177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49974367","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 : 2005-03-01DOI: 10.1109/LPEL.2005.846679
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.2005.846679","DOIUrl":"https://doi.org/10.1109/LPEL.2005.846679","url":null,"abstract":"Provides a listing of current society officers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"3 1","pages":"c3-c3"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2005.846679","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49974369","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 : 2005-03-01DOI: 10.1109/LPEL.2005.845174
S. Iqbal
A three-phase symmetrical Cockcroft-Walton (CW) multistage voltage multiplier (VM) is proposed. It consists of one smoothing column and six oscillating columns. The oscillating columns are connected to three-phase power through center-tap transformers. The capacitors of the smoothing column are charged six times per cycle by six oscillating columns and are discharged six times through the load, unlike the conventional symmetrical VM in which they are charged and discharged twice per cycle. The three-phase symmetrical structure completely eliminates the first five harmonic components of load-generated voltage ripple. Theoretical analysis indicates that the proposed three-phase symmetrical CW-VM has one-third the voltage ripple and voltage drop of the conventional single-phase symmetrical CW-VM. Experimental and simulation results of the proposed three-phase symmetrical CW-VM as well as of the conventional single-phase symmetrical CW-VM are presented. A comparison shows that the three-phase symmetrical CW-VM has significantly less voltage ripple, half the voltage drop, and a fourfold increase in output power over the conventional single-phase symmetrical CW-VM.
{"title":"A three-phase symmetrical multistage Voltage multiplier","authors":"S. Iqbal","doi":"10.1109/LPEL.2005.845174","DOIUrl":"https://doi.org/10.1109/LPEL.2005.845174","url":null,"abstract":"A three-phase symmetrical Cockcroft-Walton (CW) multistage voltage multiplier (VM) is proposed. It consists of one smoothing column and six oscillating columns. The oscillating columns are connected to three-phase power through center-tap transformers. The capacitors of the smoothing column are charged six times per cycle by six oscillating columns and are discharged six times through the load, unlike the conventional symmetrical VM in which they are charged and discharged twice per cycle. The three-phase symmetrical structure completely eliminates the first five harmonic components of load-generated voltage ripple. Theoretical analysis indicates that the proposed three-phase symmetrical CW-VM has one-third the voltage ripple and voltage drop of the conventional single-phase symmetrical CW-VM. Experimental and simulation results of the proposed three-phase symmetrical CW-VM as well as of the conventional single-phase symmetrical CW-VM are presented. A comparison shows that the three-phase symmetrical CW-VM has significantly less voltage ripple, half the voltage drop, and a fourfold increase in output power over the conventional single-phase symmetrical CW-VM.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"3 1","pages":"30-33"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2005.845174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49974368","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.2004.841943
Provides instructions and guidelines to prospective authors who wish to submit manuscripts.
为希望提交手稿的潜在作者提供说明和指导。
{"title":"IEEE Power Electronics Letters Information for authors","authors":"","doi":"10.1109/LPEL.2004.841943","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841943","url":null,"abstract":"Provides instructions and guidelines to prospective authors who wish to submit manuscripts.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"144-145"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841943","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350893","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.2004.841971
Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.
潜在作者被要求提交新的、未发表的手稿，以纳入本论文征集中描述的即将到来的活动。
{"title":"Special issue on automotive power electronics & motor drives","authors":"","doi":"10.1109/LPEL.2004.841971","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841971","url":null,"abstract":"Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"146-146"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841971","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350947","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.2004.841942
This page or pages intentionally left blank.
本页故意留白。
{"title":"IEEE Power Electronics Letters blank page","authors":"","doi":"10.1109/LPEL.2004.841942","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841942","url":null,"abstract":"This page or pages intentionally left blank.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"c4-c4"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841942","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50424305","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.2004.841972
Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.
潜在作者被要求提交新的、未发表的手稿，以纳入本论文征集中描述的即将到来的活动。
{"title":"Celebrating the vitality of technology the Proceedings of the IEEE","authors":"","doi":"10.1109/LPEL.2004.841972","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841972","url":null,"abstract":"Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"147-147"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841972","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350946","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.2004.840441
Poh Chiang Loh;D.M. 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.M. Vilathgamuwa;Seng Khai Tang;H.L. Long","doi":"10.1109/LPEL.2004.840441","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840441","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":"2 4","pages":"125-130"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840441","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350896","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.2004.841311
A.P. Hu;S. Hussmann
An improved power flow control method for contactless moving sensor applications is proposed. The method allows the design of a system where sensors with different power ratings or a wide range of load variations can be implemented. A phase-controlled variable inductor is used to tune the resonant circuit of the power pickups of an inductively coupled power transfer (ICPT) system according to the actual power requirements of the sensors, thereby, helping to reduce the power losses without affecting the maximum power transfer capacity. Soft switching is achieved in the variable inductor control, and the effect of the equivalent tuning parameters on the power flow is analyzed theoretically. Simulation results show that a significant improvement of the existing controllers is achieved at no load or very lightly loaded conditions.
{"title":"Improved power flow control for contactless moving sensor applications","authors":"A.P. Hu;S. Hussmann","doi":"10.1109/LPEL.2004.841311","DOIUrl":"https://doi.org/10.1109/LPEL.2004.841311","url":null,"abstract":"An improved power flow control method for contactless moving sensor applications is proposed. The method allows the design of a system where sensors with different power ratings or a wide range of load variations can be implemented. A phase-controlled variable inductor is used to tune the resonant circuit of the power pickups of an inductively coupled power transfer (ICPT) system according to the actual power requirements of the sensors, thereby, helping to reduce the power losses without affecting the maximum power transfer capacity. Soft switching is achieved in the variable inductor control, and the effect of the equivalent tuning parameters on the power flow is analyzed theoretically. Simulation results show that a significant improvement of the existing controllers is achieved at no load or very lightly loaded conditions.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 4","pages":"135-138"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.841311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50350894","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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