Pub Date : 2000-10-10DOI: 10.1109/NAECON.2000.894946
K. Shenai
Mixed-signal electronics form the core of spacecraft avionics systems. Low-power operation is a key design objective to reduce dependence on stored energy or energy extraction systems. To facilitate low-power operation. The supply voltage of mixed-signal systems has progressively diminished to typical present values of 3.5 V to 3.6 V. Low voltage design, however, increases susceptibility to noise interference and reduces the range of analog linear gain. Moreover, as transistor density and circuit complexity increase, traditional power minimization methods are inadequate. In this paper we present results of several approaches to enable low-power mixed-signal electronics for spacecraft avionics and commercial telecommunications. First, at the architectural level we analyze a dynamic voltage scaling approach that delivers local isolation of bus noise and a power reduction of 50% to 95%. Next, to enable in-situ, real-time power sensing we introduce two sensors that monitor di/dt and dv/dt events. Their design, scaling, and sensitivity are discussed in detail. Finally, as an example of a low-voltage compatible analog circuit we present results of a low-noise differential analog-to-digital comparator. It operates at speeds to over 50 MHz, has per-comparator power dissipation under 1 mW, and can operate at supply voltages down to 1.9 V. All circuits have been designed and analyzed for a 0.5-/spl mu/m CMOS, and analytical and experimental results are given.
混合信号电子学是航天器航空电子系统的核心。低功耗运行是一个关键的设计目标，以减少对存储能量或能量提取系统的依赖。便于低功耗运行。混合信号系统的供电电压逐渐降低到3.5 V至3.6 V的典型现值。然而，低电压设计增加了对噪声干扰的敏感性，并减小了模拟线性增益的范围。此外，随着晶体管密度和电路复杂性的增加，传统的功耗最小化方法已经不够用了。在本文中，我们介绍了几种使低功耗混合信号电子器件用于航天器航空电子设备和商业电信的方法的结果。首先，在架构层面，我们分析了一种动态电压缩放方法，该方法可提供总线噪声的局部隔离，并将功耗降低50%至95%。接下来，为了实现原位实时功率传感，我们引入了两个传感器来监测di/dt和dv/dt事件。详细讨论了它们的设计、缩放和灵敏度。最后，作为一个低压兼容模拟电路的例子，我们给出了一个低噪声差分模数比较器的结果。它的工作速度超过50 MHz，每比较器功耗低于1 mW，并且可以在低至1.9 V的电源电压下工作。在0.5-/spl μ m CMOS上设计并分析了所有电路，并给出了分析和实验结果。
{"title":"New millennium ultralow power microsystems","authors":"K. Shenai","doi":"10.1109/NAECON.2000.894946","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894946","url":null,"abstract":"Mixed-signal electronics form the core of spacecraft avionics systems. Low-power operation is a key design objective to reduce dependence on stored energy or energy extraction systems. To facilitate low-power operation. The supply voltage of mixed-signal systems has progressively diminished to typical present values of 3.5 V to 3.6 V. Low voltage design, however, increases susceptibility to noise interference and reduces the range of analog linear gain. Moreover, as transistor density and circuit complexity increase, traditional power minimization methods are inadequate. In this paper we present results of several approaches to enable low-power mixed-signal electronics for spacecraft avionics and commercial telecommunications. First, at the architectural level we analyze a dynamic voltage scaling approach that delivers local isolation of bus noise and a power reduction of 50% to 95%. Next, to enable in-situ, real-time power sensing we introduce two sensors that monitor di/dt and dv/dt events. Their design, scaling, and sensitivity are discussed in detail. Finally, as an example of a low-voltage compatible analog circuit we present results of a low-noise differential analog-to-digital comparator. It operates at speeds to over 50 MHz, has per-comparator power dissipation under 1 mW, and can operate at supply voltages down to 1.9 V. All circuits have been designed and analyzed for a 0.5-/spl mu/m CMOS, and analytical and experimental results are given.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121242168","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894980
M.S. Hodgart, P. Tortora, N. Morrison
Some theory is presented, with results from simulation, that identify a filter/estimator in the style of the Kalman filter. It promises some significant advantages relative to the usual filter in typical satellite (and other) applications. We call it a fading Gaussian deterministic filter and outline its main features.
{"title":"A Gaussian deterministic approach to smoothing and prediction for application to spacecraft attitude and orbit determination","authors":"M.S. Hodgart, P. Tortora, N. Morrison","doi":"10.1109/NAECON.2000.894980","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894980","url":null,"abstract":"Some theory is presented, with results from simulation, that identify a filter/estimator in the style of the Kalman filter. It promises some significant advantages relative to the usual filter in typical satellite (and other) applications. We call it a fading Gaussian deterministic filter and outline its main features.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124325142","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894985
Munhyoung Cho, J. Chun
In this paper, a new method is proposed for tracking the direction-of-arrival (DOA) of the wideband moving source incident on uniform linear array sensors. DOA is estimated by focusing transformation matrices. To update focusing matrices along with new data snap shots, we use the FAST (fast approximate subspace tracking) method. Present focusing matrices are constructed by previous signal and its orthogonal basis vectors as well as present signal and its orthogonal basis vectors, which are the left and right singular vectors of the inner product of two approximated matrices. Simulation results are shown to illustrate the performance of the proposed method.
{"title":"Updating the focusing matrix for the DOA estimation of moving sources","authors":"Munhyoung Cho, J. Chun","doi":"10.1109/NAECON.2000.894985","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894985","url":null,"abstract":"In this paper, a new method is proposed for tracking the direction-of-arrival (DOA) of the wideband moving source incident on uniform linear array sensors. DOA is estimated by focusing transformation matrices. To update focusing matrices along with new data snap shots, we use the FAST (fast approximate subspace tracking) method. Present focusing matrices are constructed by previous signal and its orthogonal basis vectors as well as present signal and its orthogonal basis vectors, which are the left and right singular vectors of the inner product of two approximated matrices. Simulation results are shown to illustrate the performance of the proposed method.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124671231","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894972
Wei Yan, Zhaoda Zhu
The problem of obtaining accurate direction of arrival (DOA) estimation of narrow-band sources lying in the far field of the array is one of the central problems in radar, sonar and seismology. In this paper a real-valued genetic algorithm is used to obtain the global optimal solution of the maximum likelihood (ML) DOA estimation. It overcomes the local optima problem existing in some ML DOA estimation algorithms, and improves the estimation accuracy. The proposed real-valued genetic algorithm is composed of real-valued crossover and mutation operators constructed with the information of real number field and objective function. It is an ideal method for searching for the global solution of non-linear real variable functions. Simulation results of noncoherent and coherent sources DOA estimation show that the proposed algorithm is better in accuracy over some conventional DOA estimation algorithms.
{"title":"Maximum likelihood DOA estimation by real-valued genetic algorithm","authors":"Wei Yan, Zhaoda Zhu","doi":"10.1109/NAECON.2000.894972","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894972","url":null,"abstract":"The problem of obtaining accurate direction of arrival (DOA) estimation of narrow-band sources lying in the far field of the array is one of the central problems in radar, sonar and seismology. In this paper a real-valued genetic algorithm is used to obtain the global optimal solution of the maximum likelihood (ML) DOA estimation. It overcomes the local optima problem existing in some ML DOA estimation algorithms, and improves the estimation accuracy. The proposed real-valued genetic algorithm is composed of real-valued crossover and mutation operators constructed with the information of real number field and objective function. It is an ideal method for searching for the global solution of non-linear real variable functions. Simulation results of noncoherent and coherent sources DOA estimation show that the proposed algorithm is better in accuracy over some conventional DOA estimation algorithms.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"317 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121597073","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894913
Yang Xiao, Clark Chen, Y. Wang
Multimedia services with Quality of Service (QoS) have become very demanded in wireless/mobile networks. Call admission control (CAC) is vital for these services partially due to the network's limited capacity. In this paper, we propose a call admission control framework for adaptive multimedia services in a wireless/mobile network, where the bandwidth of an ongoing call is time-varying during its lifetime. A call is degraded if the assigned bandwidth is below its request bandwidth. We introduce a new QoS parameter: degraded area size (DAS). It stands for the normalized mean product of the proportion of a calls degraded time and the degree of degradation. Based on DAS, we present a CAC model to show how to guarantee DAS. We also introduce a bandwidth reallocation algorithm to adjust calls bandwidth in a cell. Simulation results are compared with those from non adaptive multimedia services and show that the performance of our method is better.
{"title":"Quality of service and call admission control for adaptive multimedia services in wireless/mobile networks","authors":"Yang Xiao, Clark Chen, Y. Wang","doi":"10.1109/NAECON.2000.894913","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894913","url":null,"abstract":"Multimedia services with Quality of Service (QoS) have become very demanded in wireless/mobile networks. Call admission control (CAC) is vital for these services partially due to the network's limited capacity. In this paper, we propose a call admission control framework for adaptive multimedia services in a wireless/mobile network, where the bandwidth of an ongoing call is time-varying during its lifetime. A call is degraded if the assigned bandwidth is below its request bandwidth. We introduce a new QoS parameter: degraded area size (DAS). It stands for the normalized mean product of the proportion of a calls degraded time and the degree of degradation. Based on DAS, we present a CAC model to show how to guarantee DAS. We also introduce a bandwidth reallocation algorithm to adjust calls bandwidth in a cell. Simulation results are compared with those from non adaptive multimedia services and show that the performance of our method is better.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123320550","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894973
T. Lin
In this paper, a novel beamforming scheme is proposed for reception of coherent signals and suppression of strong interference. An interference-blocking (IB) transformation is first developed for removing the strong interference, while the desired signals and noise are retained. Optimum beamforming is then performed based on the IB transformation data consisting of only the desired signals and noise to produce maximum output signal-to-interference-plus-noise ratio (SINR). Numerical results demonstrate that the proposed interference-blocking maximum signal-to-noise ratio (IB-MSNR) beamformer significantly outperforms the conventional beamformers and can approximately achieve the performance of the optimum beamformer.
{"title":"A novel beamformer with multipath signal reception","authors":"T. Lin","doi":"10.1109/NAECON.2000.894973","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894973","url":null,"abstract":"In this paper, a novel beamforming scheme is proposed for reception of coherent signals and suppression of strong interference. An interference-blocking (IB) transformation is first developed for removing the strong interference, while the desired signals and noise are retained. Optimum beamforming is then performed based on the IB transformation data consisting of only the desired signals and noise to produce maximum output signal-to-interference-plus-noise ratio (SINR). Numerical results demonstrate that the proposed interference-blocking maximum signal-to-noise ratio (IB-MSNR) beamformer significantly outperforms the conventional beamformers and can approximately achieve the performance of the optimum beamformer.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129010878","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894937
S. Ahmad, A. Chipperfield, O. Tokhi
A dynamic model for the characterising of a one-degree-of-freedom (DOF) twin rotor MIMO system (TRMS) in hover is extracted using a black-box system identification technique. The behaviour of the TRMS in certain aspects resembles that of a helicopter. Hence, it is an interesting identification and control problem. Identification for a 1-DOF rigid-body, discrete-time linear model is presented. The extracted model is employed in the design of a feedback LQG compensator. This has a good tracking capability, but requires high control effort and has inadequate authority over residual vibration of the system. These problems are resolved by further augmenting the system with a command path prefilter. The combined feedforward and feedback compensator satisfies the performance objectives and obeys the actuator constraint.
{"title":"Dynamic modeling and optimal control of a twin rotor MIMO system","authors":"S. Ahmad, A. Chipperfield, O. Tokhi","doi":"10.1109/NAECON.2000.894937","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894937","url":null,"abstract":"A dynamic model for the characterising of a one-degree-of-freedom (DOF) twin rotor MIMO system (TRMS) in hover is extracted using a black-box system identification technique. The behaviour of the TRMS in certain aspects resembles that of a helicopter. Hence, it is an interesting identification and control problem. Identification for a 1-DOF rigid-body, discrete-time linear model is presented. The extracted model is employed in the design of a feedback LQG compensator. This has a good tracking capability, but requires high control effort and has inadequate authority over residual vibration of the system. These problems are resolved by further augmenting the system with a command path prefilter. The combined feedforward and feedback compensator satisfies the performance objectives and obeys the actuator constraint.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128335628","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894891
Madhavi Yeleswarapu, J. Seitzer
Inductive logic programming (ILP) is a form of machine learning that induces rules from data using the language and syntax of logic programming. A rule construction algorithm forms rules that summarize data sets. These rules can be used in a large spectrum of data mining activities. In ILP, the rules are constructed with a target predicate as the consequent, or head, of the rule, and with high-ranking literals forming the antecedent, or body, of the rule. The predicate rankings are obtained by applying predicate ranking algorithms to a domain (background) knowledge base. We present three new predicate ranking algorithms for the inductive logic programming system, INDED (pronounced "indeed"). The algorithms use a grouping technique employing basic set theoretic operations to generate the rankings. We also present results of applying the ranking algorithms to several problem domains, some of which are universal like the classical genealogy problem and others, not so common. In particular, diagnosis is the main thread of many of our experiments. Here, although our experimentation relates to medical diagnosis in diabetes and Lyme disease, many of the same techniques and methodologies can be applied to other forms of diagnosis including system failure, sensor detection, and trouble-shooting.
{"title":"Predicate ranking algorithms and their application in an inductive logic programming system","authors":"Madhavi Yeleswarapu, J. Seitzer","doi":"10.1109/NAECON.2000.894891","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894891","url":null,"abstract":"Inductive logic programming (ILP) is a form of machine learning that induces rules from data using the language and syntax of logic programming. A rule construction algorithm forms rules that summarize data sets. These rules can be used in a large spectrum of data mining activities. In ILP, the rules are constructed with a target predicate as the consequent, or head, of the rule, and with high-ranking literals forming the antecedent, or body, of the rule. The predicate rankings are obtained by applying predicate ranking algorithms to a domain (background) knowledge base. We present three new predicate ranking algorithms for the inductive logic programming system, INDED (pronounced \"indeed\"). The algorithms use a grouping technique employing basic set theoretic operations to generate the rankings. We also present results of applying the ranking algorithms to several problem domains, some of which are universal like the classical genealogy problem and others, not so common. In particular, diagnosis is the main thread of many of our experiments. Here, although our experimentation relates to medical diagnosis in diabetes and Lyme disease, many of the same techniques and methodologies can be applied to other forms of diagnosis including system failure, sensor detection, and trouble-shooting.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130775804","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894925
D. van Cleave, K. Rattan
The transformation of expert's knowledge to control rules in a fuzzy logic controller has not been formalized and arbitrary choices concerning, for example, the shape of membership functions have to be made. The quality of a fuzzy controller can be drastically affected by the choice of membership functions. Thus, methods for tuning fuzzy logic controllers are needed. In this paper, neural networks and fuzzy logic are combined to solve the problem of tuning fuzzy logic controllers. The neuro-fuzzy controller uses the neural network learning techniques to tune the membership functions while keeping the semantics of the fuzzy logic controller intact. Both the architecture and the tuning algorithm are presented for a general neuro-fuzzy controller. From this, a procedure to tune a proportional fuzzy controller is obtained. The algorithm for off-line tuning of the fuzzy controller is demonstrated with a numerical example.
{"title":"Tuning of fuzzy logic controller using neural network","authors":"D. van Cleave, K. Rattan","doi":"10.1109/NAECON.2000.894925","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894925","url":null,"abstract":"The transformation of expert's knowledge to control rules in a fuzzy logic controller has not been formalized and arbitrary choices concerning, for example, the shape of membership functions have to be made. The quality of a fuzzy controller can be drastically affected by the choice of membership functions. Thus, methods for tuning fuzzy logic controllers are needed. In this paper, neural networks and fuzzy logic are combined to solve the problem of tuning fuzzy logic controllers. The neuro-fuzzy controller uses the neural network learning techniques to tune the membership functions while keeping the semantics of the fuzzy logic controller intact. Both the architecture and the tuning algorithm are presented for a general neuro-fuzzy controller. From this, a procedure to tune a proportional fuzzy controller is obtained. The algorithm for off-line tuning of the fuzzy controller is demonstrated with a numerical example.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125071303","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 : 2000-10-10DOI: 10.1109/NAECON.2000.894956
K. Shenai, P. Singh, S. Rao, D. Sorenson, K. Chu, G. Gaylon
This paper presents the results obtained from a study conducted to evaluate the long-term operational reliability of dc-dc power converters used in computer and telecom applications. A full-bridge, phase-shifted zero voltage switching (ZVS) PWM converter was investigated experimentally and theoretically it is shown that under low-load conditions, the intrinsic body diode of the MOSFET undergoes dynamic avalanching during its reverse recovery with an associated high dv/dt. This phenomenon results in an excessive power loss in the circuit and increased switching stress for the MOSFET. The converter failure under low-load conditions can be associated with this mechanism as one of the potential causes. The paper also presents experimental results obtained on dc-dc power converter prototypes smeared with zinc whiskers. It is shown that power supply arcing under these conditions is a potential cause of failure.
{"title":"Power supply design for performance and reliability","authors":"K. Shenai, P. Singh, S. Rao, D. Sorenson, K. Chu, G. Gaylon","doi":"10.1109/NAECON.2000.894956","DOIUrl":"https://doi.org/10.1109/NAECON.2000.894956","url":null,"abstract":"This paper presents the results obtained from a study conducted to evaluate the long-term operational reliability of dc-dc power converters used in computer and telecom applications. A full-bridge, phase-shifted zero voltage switching (ZVS) PWM converter was investigated experimentally and theoretically it is shown that under low-load conditions, the intrinsic body diode of the MOSFET undergoes dynamic avalanching during its reverse recovery with an associated high dv/dt. This phenomenon results in an excessive power loss in the circuit and increased switching stress for the MOSFET. The converter failure under low-load conditions can be associated with this mechanism as one of the potential causes. The paper also presents experimental results obtained on dc-dc power converter prototypes smeared with zinc whiskers. It is shown that power supply arcing under these conditions is a potential cause of failure.","PeriodicalId":171131,"journal":{"name":"Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127914306","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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