Pub Date : 2004-09-01DOI: 10.1109/LPEL.2004.839638
C. Buttay;T.B. Salah;D. Bergogne;B. Allard;H. Morel;J.-P. Chante
This letter addresses the behavior of low voltage power MOSFETs under avalanche, with a paralleling point of view. It is shown that during avalanche, up-to-date technology MOSFET transistors exhibit a resistance far in excess of their on-state resistance (R/sub DSon/). A novel test setup is proposed to measure "avalanche" resistance. A simple model of breakdown voltage is then proposed. It becomes possible to perform fast simulations using this model to study current balance between paralleled transistors under avalanche operation. It is shown that considering avalanche resistance reduces the influence of breakdown voltage mismatches and allows for better current sharing.
{"title":"Avalanche behavior of low-voltage power MOSFETs","authors":"C. Buttay;T.B. Salah;D. Bergogne;B. Allard;H. Morel;J.-P. Chante","doi":"10.1109/LPEL.2004.839638","DOIUrl":"https://doi.org/10.1109/LPEL.2004.839638","url":null,"abstract":"This letter addresses the behavior of low voltage power MOSFETs under avalanche, with a paralleling point of view. It is shown that during avalanche, up-to-date technology MOSFET transistors exhibit a resistance far in excess of their on-state resistance (R/sub DSon/). A novel test setup is proposed to measure \"avalanche\" resistance. A simple model of breakdown voltage is then proposed. It becomes possible to perform fast simulations using this model to study current balance between paralleled transistors under avalanche operation. It is shown that considering avalanche resistance reduces the influence of breakdown voltage mismatches and allows for better current sharing.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"104-107"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.839638","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225502","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 : 2004-09-01DOI: 10.1109/LPEL.2004.840320
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.2004.840320","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840320","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 3","pages":"109-110"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225504","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 : 2004-09-01DOI: 10.1109/LPEL.2004.838777
S.S.M. Chan;H.S.H. Chung;R.S.Y. Hui
This letter presents a low-cost solution for converting the popularly adopted nondimmable electronic ballast circuit for fluorescent lamps with self-oscillating series resonant inverter into a dimmable one. The dimming function is achieved by increasing the switching frequency of the inverter from the natural frequency of the resonant tank, so that less energy is coupled to the lamp. Control of the switching frequency is based on deriving an adjustable dc current source from the inductor in the resonant tank to control the operating point of the saturable chokes for driving the switches in the inverter. The overall circuit does not require any integrated circuit. A 17-W prototype has been built and tested. Theoretical predictions have been verified with experimental results. The lamp can be dimmed to 10% of the full brightness.
{"title":"Self-oscillating dimmable electronic ballast for fluorescent lamps","authors":"S.S.M. Chan;H.S.H. Chung;R.S.Y. Hui","doi":"10.1109/LPEL.2004.838777","DOIUrl":"https://doi.org/10.1109/LPEL.2004.838777","url":null,"abstract":"This letter presents a low-cost solution for converting the popularly adopted nondimmable electronic ballast circuit for fluorescent lamps with self-oscillating series resonant inverter into a dimmable one. The dimming function is achieved by increasing the switching frequency of the inverter from the natural frequency of the resonant tank, so that less energy is coupled to the lamp. Control of the switching frequency is based on deriving an adjustable dc current source from the inductor in the resonant tank to control the operating point of the saturable chokes for driving the switches in the inverter. The overall circuit does not require any integrated circuit. A 17-W prototype has been built and tested. Theoretical predictions have been verified with experimental results. The lamp can be dimmed to 10% of the full brightness.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"87-91"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.838777","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225496","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 : 2004-09-01DOI: 10.1109/LPEL.2004.840319
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.2004.840319","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840319","url":null,"abstract":"This page or pages intentionally left blank.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"c4-c4"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840319","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50425689","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 : 2004-09-01DOI: 10.1109/LPEL.2004.834837
{"title":"Correction to \"Output Voltage Distortion Characterization in Multilevel PWM Converters\"","authors":"","doi":"10.1109/LPEL.2004.834837","DOIUrl":"https://doi.org/10.1109/LPEL.2004.834837","url":null,"abstract":"","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"108-108"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.834837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225505","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 : 2004-09-01DOI: 10.1109/LPEL.2004.834921
A.V. Timbus;R. Teodorescu;F. Blaabjerg;U. Borup
Photovoltaic (PV) and other sources of renewable energy are being used increasingly in grid-connected systems, for which stronger power quality requirements are being issued. Continuous grid monitoring should be considered so as to provide safe connections and disconnections from the grid. This letter gives an overview of the methods used for online grid measurement with PV inverters. Emphasis is placed on a method based on the injection of a noncharacteristic harmonic in the grid. Since this injection is regarded as a disturbance for the grid, different issues, i.e., the influence on total harmonic distortion (THD), the accuracy of line impedance measurement and the ENS (German abbreviation of Main Monitoring units with allocated Switching Devices) detection are studied. Laboratory results conducted on an existing PV inverter are presented to demonstrate the behavior of the PV inverter under different grid conditions. Some of the injection parameters are tuned in order to get an accurate measurement of line impedance.
{"title":"Online grid measurement and ENS detection for PV inverter running on highly inductive grid","authors":"A.V. Timbus;R. Teodorescu;F. Blaabjerg;U. Borup","doi":"10.1109/LPEL.2004.834921","DOIUrl":"https://doi.org/10.1109/LPEL.2004.834921","url":null,"abstract":"Photovoltaic (PV) and other sources of renewable energy are being used increasingly in grid-connected systems, for which stronger power quality requirements are being issued. Continuous grid monitoring should be considered so as to provide safe connections and disconnections from the grid. This letter gives an overview of the methods used for online grid measurement with PV inverters. Emphasis is placed on a method based on the injection of a noncharacteristic harmonic in the grid. Since this injection is regarded as a disturbance for the grid, different issues, i.e., the influence on total harmonic distortion (THD), the accuracy of line impedance measurement and the ENS (German abbreviation of Main Monitoring units with allocated Switching Devices) detection are studied. Laboratory results conducted on an existing PV inverter are presented to demonstrate the behavior of the PV inverter under different grid conditions. Some of the injection parameters are tuned in order to get an accurate measurement of line impedance.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"77-82"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.834921","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225495","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 : 2004-09-01DOI: 10.1109/LPEL.2004.840318
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.2004.840318","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840318","url":null,"abstract":"Provides a listing of current society officers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"c3-c3"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225498","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 : 2004-09-01DOI: 10.1109/LPEL.2004.837748
J.C.A. Floriani
The aim of this letter is to describe a generalized analysis of the current ripple occurring in an H-bridge with pulsewidth modulation (PWM) technique. The general equation of the current ripple is obtained. By means of this equation, it is shown that the two strategies commonly used for the bridge control (unipolar and bipolar) are two limit cases of a general method. The control condition with minimum ripple is found. Finally, experimental results of a typical example are shown (applied to a DC drive) in different conditions, thus confirming the theoretical results.
{"title":"Generalized analysis of current ripple in a pulsewidth modulation H-bridge converter with unipolar-bipolar switching","authors":"J.C.A. Floriani","doi":"10.1109/LPEL.2004.837748","DOIUrl":"https://doi.org/10.1109/LPEL.2004.837748","url":null,"abstract":"The aim of this letter is to describe a generalized analysis of the current ripple occurring in an H-bridge with pulsewidth modulation (PWM) technique. The general equation of the current ripple is obtained. By means of this equation, it is shown that the two strategies commonly used for the bridge control (unipolar and bipolar) are two limit cases of a general method. The control condition with minimum ripple is found. Finally, experimental results of a typical example are shown (applied to a DC drive) in different conditions, thus confirming the theoretical results.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"83-86"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.837748","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50425690","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 : 2004-09-01DOI: 10.1109/LPEL.2004.839640
J.W. Kimball;T.L. Flowers;P.L. Chapman
Issues associated with boost converter design and performance are investigated when a low input voltage is used. Low-input-voltage sources include single fuel cells, single solar cells, and thermoelectric devices. The primary context is interfacing single micro fuel cells to portable electronic loads, such as mobile phones. Efficiency and circuit startup are the two most difficult issues for a low-cost design. It is shown in theory and experiment that the boost converter has a voltage collapse point. A simple startup technique is proposed that is appropriate for some applications.
{"title":"Low-input-voltage, low-power boost converter design issues","authors":"J.W. Kimball;T.L. Flowers;P.L. Chapman","doi":"10.1109/LPEL.2004.839640","DOIUrl":"https://doi.org/10.1109/LPEL.2004.839640","url":null,"abstract":"Issues associated with boost converter design and performance are investigated when a low input voltage is used. Low-input-voltage sources include single fuel cells, single solar cells, and thermoelectric devices. The primary context is interfacing single micro fuel cells to portable electronic loads, such as mobile phones. Efficiency and circuit startup are the two most difficult issues for a low-cost design. It is shown in theory and experiment that the boost converter has a voltage collapse point. A simple startup technique is proposed that is appropriate for some applications.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"96-99"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.839640","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225501","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 : 2004-09-01DOI: 10.1109/LPEL.2004.840316
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.2004.840316","DOIUrl":"https://doi.org/10.1109/LPEL.2004.840316","url":null,"abstract":"Provides a listing of current society officers.","PeriodicalId":100635,"journal":{"name":"IEEE Power Electronics Letters","volume":"2 3","pages":"c2-c2"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/LPEL.2004.840316","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50225494","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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