Pub Date : 1990-10-21DOI: 10.1109/INTLEC.1990.171233
T. Vescovi, N. Vun
A 200 A rectifier has been specifically designed to power telephone switching equipment. It is a constant-voltage, current-limited PWM SMPS (switched-mode power supply) with instrumentation and other features suitable for this type of application. A controlled rectifier utilizing MOSFET switches converts the 3-phase-input AC power to a regulated 400 V DC supply. The switching scheme ensures that the input current waveforms are sinusoidal. A forward converter then transforms the 400 volt supply to the regulated 48 volt nominal output required for this application.<>
{"title":"A switched-mode 200 A 48 V rectifier/battery charger for telecommunications applications","authors":"T. Vescovi, N. Vun","doi":"10.1109/INTLEC.1990.171233","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171233","url":null,"abstract":"A 200 A rectifier has been specifically designed to power telephone switching equipment. It is a constant-voltage, current-limited PWM SMPS (switched-mode power supply) with instrumentation and other features suitable for this type of application. A controlled rectifier utilizing MOSFET switches converts the 3-phase-input AC power to a regulated 400 V DC supply. The switching scheme ensures that the input current waveforms are sinusoidal. A forward converter then transforms the 400 volt supply to the regulated 48 volt nominal output required for this application.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167935","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 : 1990-10-21DOI: 10.1109/INTLEC.1990.171217
J. Coppinger
Two hurricane-force storms in the past three years have severely tested the British Telecom UK network. The task of restoring telecommunications service presented huge challenges in the deployment of staff equipment and materials. Experience was gained about both systems and procedures and, in particular, the importance of remote alarm, interrogation, and control facilities. The author describes the extent of the disruption and deals mainly with the performance of telecommunications power systems, the lessons learned and plans for closer integration of network power and building services within the network operations unit.<>
{"title":"Wind storms in Britain (BT power systems)","authors":"J. Coppinger","doi":"10.1109/INTLEC.1990.171217","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171217","url":null,"abstract":"Two hurricane-force storms in the past three years have severely tested the British Telecom UK network. The task of restoring telecommunications service presented huge challenges in the deployment of staff equipment and materials. Experience was gained about both systems and procedures and, in particular, the importance of remote alarm, interrogation, and control facilities. The author describes the extent of the disruption and deals mainly with the performance of telecommunications power systems, the lessons learned and plans for closer integration of network power and building services within the network operations unit.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":"250 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117346642","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 : 1990-10-21DOI: 10.1109/INTLEC.1990.171235
R. Kakalec
The design of a telephone central office telecommunication battery plant is discussed with an emphasis on the critical processes required to insure a quality performing battery plant-thorough and complete requirements, design considerations, and system integration testing. Two perspectives of a quality battery plant are presented-the vendor's and the user's.<>
{"title":"A system approach assures quality battery plant performance","authors":"R. Kakalec","doi":"10.1109/INTLEC.1990.171235","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171235","url":null,"abstract":"The design of a telephone central office telecommunication battery plant is discussed with an emphasis on the critical processes required to insure a quality performing battery plant-thorough and complete requirements, design considerations, and system integration testing. Two perspectives of a quality battery plant are presented-the vendor's and the user's.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116943942","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 : 1990-10-21DOI: 10.1109/INTLEC.1990.171281
T. Aoki, K. Yotsumoto, S. Muroyama, Y. Kenmochi
A new configuration and control mechanism for an uninterruptible power supply (UPS) with a bidirectional cycloconverter are described. When commercial AC power is operating normally, the load is supplied by commercial AC power and the bidirectional cycloconverter operates as a battery charger. During interruptions of commercial AC power, the bidirectional cycloconverter operates as an inverter and supplies AC power to the load. Unlike conventional UPS, this new configuration does not require a battery charger, so it can be small, light-weight, cost-effective, and highly efficient. The output characteristics during the commercial AC power interruptions are also discussed.<>
{"title":"A new uninterruptible power supply with a bidirectional cycloconverter","authors":"T. Aoki, K. Yotsumoto, S. Muroyama, Y. Kenmochi","doi":"10.1109/INTLEC.1990.171281","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171281","url":null,"abstract":"A new configuration and control mechanism for an uninterruptible power supply (UPS) with a bidirectional cycloconverter are described. When commercial AC power is operating normally, the load is supplied by commercial AC power and the bidirectional cycloconverter operates as a battery charger. During interruptions of commercial AC power, the bidirectional cycloconverter operates as an inverter and supplies AC power to the load. Unlike conventional UPS, this new configuration does not require a battery charger, so it can be small, light-weight, cost-effective, and highly efficient. The output characteristics during the commercial AC power interruptions are also discussed.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126937236","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 : 1990-10-01DOI: 10.1109/INTLEC.1990.171245
P. Imbertson, N. Mohan
A new PWM (pulse width modulation) technique is presented and applied to two DC-DC power converters. The new converter topologies completely eliminate switching losses while retaining the low conduction losses typical of PWM circuits. The switches are operated for differing lengths of time, i.e., with unbalanced or asymmetrical duty cycles (for example, one switch at 40% and the other at 60%). The deadtime between switch conduction intervals is made long enough to insure that the switch voltages have commutated naturally from rail to rail, but not so long that the switch voltages have begun their return trip along their oscillatory path between the input rails. Thus, the best features of resonant (zero switching loss) and PWM (low conduction loss) circuits are combined. Design equations and notes are included for a buck type (step-down) and a boost type (step-up) converter.<>
{"title":"New PWM converter circuits combining zero switching loss with low conduction loss","authors":"P. Imbertson, N. Mohan","doi":"10.1109/INTLEC.1990.171245","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171245","url":null,"abstract":"A new PWM (pulse width modulation) technique is presented and applied to two DC-DC power converters. The new converter topologies completely eliminate switching losses while retaining the low conduction losses typical of PWM circuits. The switches are operated for differing lengths of time, i.e., with unbalanced or asymmetrical duty cycles (for example, one switch at 40% and the other at 60%). The deadtime between switch conduction intervals is made long enough to insure that the switch voltages have commutated naturally from rail to rail, but not so long that the switch voltages have begun their return trip along their oscillatory path between the input rails. Thus, the best features of resonant (zero switching loss) and PWM (low conduction loss) circuits are combined. Design equations and notes are included for a buck type (step-down) and a boost type (step-up) converter.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123436764","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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