{"title":"Modeling and simulation of traveling waves in induction motor drives","authors":"A. Hussein, G. Joos","doi":"10.1109/APEC.1997.581443","DOIUrl":"https://doi.org/10.1109/APEC.1997.581443","url":null,"abstract":"Adjustable speed induction motor drives are used more and more often in industry, particularly as an energy saving measure. In the standard configuration, the motor is fed from a voltage source inverter. A number of motor winding failures have been recorded and attributed to overvoltage resulting from the high dv/dt inverter outputs waveforms. This paper is a contribution to the modelling and simulation of the traveling wave phenomenon in induction motor drives. Modelling options for the feed cables are discussed and the use of distributed parameter modelling is proposed. The influence of line length and power semiconductor switching times on the magnitude of overvoltages are investigated. Simulation studies are carried out using the EMTP software package. Solutions are proposed and a filter design procedure is given. Selected results are verified experimentally.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124161874","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}
{"title":"Analysis and design of N paralleled DC-DC converters with master-slave current-sharing control","authors":"Y. Panov, J. Rajagopalan, F. Lee","doi":"10.1109/APEC.1997.581489","DOIUrl":"https://doi.org/10.1109/APEC.1997.581489","url":null,"abstract":"Dynamic analysis and design of paralleled DC-DC power converters with master-slave current sharing control is challenged by the abundance of feedback loops and loop gains. A systematic approach for assessing the small-signal stability and dynamic performance of paralleled modules is presented. The approach is based on the interface stability concept and allows a straightforward design of a current-sharing loop compensator. The suggested approach is general and can be applied to any number of paralleled modules.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"35 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125722340","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}
{"title":"Design and analysis of thermal management for high-power-density converters in sealed enclosures","authors":"M.T. Zhang, M. Jovanovic, F. Lee","doi":"10.1109/APEC.1997.581482","DOIUrl":"https://doi.org/10.1109/APEC.1997.581482","url":null,"abstract":"The size of external AC/DC adapters and battery chargers used in today's portable electronic equipment, such as notebook computers and portable printers, continues to decrease, while their rated output power slowly but steadily increases. As a result of the increased power density of the state-of-the-art adapter/chargers, the thermal management of the generated heat has become one the of most challenging design tasks. In fact, to optimize thermal performance, improve product reliability and shorten design time, sophisticated thermal modeling is becoming an integral part of the design cycle. This paper discusses thermal-design considerations for high-power-density converters in sealed enclosures using a computational fluid dynamics (CFD) simulation approach. The thermal-design optimization guidelines obtained by simulations were verified on an experimental, high-power-density, 36 W, offline AC/DC notebook adapter.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133313289","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}
{"title":"New universal control methods for power factor correction and DC to DC converter applications","authors":"J. Hwang, A. Chee, W. Ki","doi":"10.1109/APEC.1997.581434","DOIUrl":"https://doi.org/10.1109/APEC.1997.581434","url":null,"abstract":"Two new methods are described in implementing power factor correction. They are simple, easy to implement, cost effective and provide comparable or better performance over the existing schemes. The first method is a generalization of the nonlinear carrier control method which could be applied to all second order power converters: the buck, boost and flyback power converters with either leading-edge or trailing-edge modulation. Equations are derived for each of these six topologies, and simulation results are presented for the boost power converter with leading-edge modulation. The advantage of using leading-edge modulation is that the RHP zero is eliminated, thus broadening the power converter's bandwidth. The authors suggest that this generalized technique be called \"input current modulation\". The second method is similar to the average current control method employing leading-edge modulation, but sensing of the input voltage information is not required. Slope compensation is achieved by integrating the output of the error amplifier where the slope is controlled by the output level of the error amplifier. This method can be applied to all six topologies mentioned and is called the \"input current shaping\" technique. The authors implemented a boost power converter with leading-edge modulation on a 2 /spl mu/m BiCMOS process. Experimental results are provided to demonstrate the robustness of the latter method.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133682015","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}
Hengehun Maol, Jindong Zhang, F. Lee, D. Boroyevich
{"title":"Zero-voltage-transition DC-link techniques for three-phase AC-DC-AC PWM converters","authors":"Hengehun Maol, Jindong Zhang, F. Lee, D. Boroyevich","doi":"10.1109/APEC.1997.575660","DOIUrl":"https://doi.org/10.1109/APEC.1997.575660","url":null,"abstract":"New soft-switching topologies are proposed for AC-DC-AC power converters by applying a soft-switching mechanism to the common DC link, and using a single auxiliary circuit, which provides the soft-switching function to all of the twelve main switches. The switches in the AC-DC power converter and the DC link switch are turned on with zero voltage, while the switches in the DC-AC power converter are turned off with zero-voltage, resulting in much reduced switching losses. With coordinated control of the AC-DC and the DC-AC power converters, the soft-switching circuit is actuated only once in every switching cycle, and has much less power loss than in existing schemes.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114365588","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}
{"title":"Smart power transistors for electronic ballasts","authors":"N. Aiello, A. L. La Barbera, S. Sueri, V. Sukumar","doi":"10.1109/APEC.1997.581451","DOIUrl":"https://doi.org/10.1109/APEC.1997.581451","url":null,"abstract":"A new vertical power IC process was used to design a cost-competitive, three terminal TO-220 power switching device, the VB348, which is optimized for fluorescent ballast applications. This IC comprises a high voltage power bipolar transistor, MOS emitter switch, drive circuitry and protection features (including overtemperature shutdown). The application in a commercial ballast and the problems related to the various parasitic effects are discussed. Overtemperature protection and reduced variation in switching parameters are key advantages.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124740845","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}
{"title":"A high efficient single stage single switch high power factor AC/DC converter with universal input","authors":"J. Qian, F. C. Lee","doi":"10.1109/APEC.1997.581465","DOIUrl":"https://doi.org/10.1109/APEC.1997.581465","url":null,"abstract":"A single stage single switch high power factor correction AC/DC converter with universal input is presented in this paper. The high power factor can be achieved based upon the charge pump concept and power factor correction stage operating in the continuous current mode. The switch has no current and voltage stresses over a wide range of load variation so that a low voltage rating device can be used. The presented converter has features of high power factor, high efficiency, and low cost. An 80-watt prototype was implemented to show that it has 85% higher efficiency with no voltage stress from 0.5% to 100% load variation over universal line input.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127529805","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}
{"title":"Electrical modeling of HF coupled inductors supplying a double frequency inductive plasma reactor","authors":"P. Colpo, R. Ernst, J. Keradec","doi":"10.1109/APEC.1997.575759","DOIUrl":"https://doi.org/10.1109/APEC.1997.575759","url":null,"abstract":"A new inductive plasma reactor has been developed for metal coating. It combines magnetic plasma generation at 13.56 MHz and induction heating at 100 kHz. The unavoidable coupling of the two coaxial coils allows one electrical generator to force power in the other, compromising the reliability of the system, except if rejecting filters are inserted. Therefore, an equivalent circuit of the double coil set is needed to specify and design the necessary filters. The aim of this paper is to present and justify the electrical representation of this very special high frequency transformer which have been used successfully.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127151296","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}
{"title":"PWM inverters and their influence on motor overvoltage","authors":"R. Kerkman, D. Leggate, D. Schlegel, G. Skibinski","doi":"10.1109/APEC.1997.581440","DOIUrl":"https://doi.org/10.1109/APEC.1997.581440","url":null,"abstract":"Modern voltage source pulse width modulation (PWM) inverters have elevated adjustable speed AC drives to a performance level comparable to DC drives. To accomplish this, voltage source inverters (VSI) now employ third generation insulated gate bipolar transistors (IGBT); however, the fast rise times associated with these devices produce unintended consequences. This paper examines motor overvoltages resulting from IGBT PWM VSI. Previous investigations have shown a critical power cable distance exists beyond which twice bus voltage (2 pu) terminal voltages are possible. This is determined primarily by the rise time of the devices and cable characteristics. This paper investigates motor voltages >2 pu, their cause and solution. In contrast to motor voltages /spl ges/2 pu, the paper shows motor voltages >2 pu primarily are determined by the PWM carrier frequency and modulation strategy. Furthermore, the paper demonstrates motor voltages up to 3-4 pu are possible. Software modifications to the PWM modulator and modulating signal are presented to reduce >2 pu motor overvoltage. Additionally, a hardware correction, easily implemented within a field programmable gate array (FPGA), is disclosed and experimentally demonstrated.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128900564","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}
{"title":"Corona in switching power supplies","authors":"A. Brockschmidt","doi":"10.1109/APEC.1997.581430","DOIUrl":"https://doi.org/10.1109/APEC.1997.581430","url":null,"abstract":"Design literature for dealing with corona in switching power supplies for aircraft or in lamp ballasts does not contain the effects of the switching frequency on corona inception or extinguish voltages. Test data is presented showing these effects. Design techniques for corona are also discussed.","PeriodicalId":423659,"journal":{"name":"Proceedings of APEC 97 - Applied Power Electronics Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130797677","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}