The Experts below are selected from a list of 3279 Experts worldwide ranked by ideXlab platform
Tsungyen Tsai - One of the best experts on this subject based on the ideXlab platform.
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high accuracy knee voltage detection for primary side control in flyback battery charger
IEEE Transactions on Circuits and Systems I-regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a $0.5\mu \text {m}$ BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
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High Accuracy Knee Voltage Detection for Primary-Side Control in Flyback Battery Charger
IEEE Transactions on Circuits and Systems I: Regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a 0.5μm BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
Shanghsien Yang - One of the best experts on this subject based on the ideXlab platform.
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high accuracy knee voltage detection for primary side control in flyback battery charger
IEEE Transactions on Circuits and Systems I-regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a $0.5\mu \text {m}$ BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
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High Accuracy Knee Voltage Detection for Primary-Side Control in Flyback Battery Charger
IEEE Transactions on Circuits and Systems I: Regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a 0.5μm BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
Peter E. Sutherland - One of the best experts on this subject based on the ideXlab platform.
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Snubber design for transformer protection
IEEE Transactions on Industry Applications, 2016Co-Authors: Peter E. Sutherland, Marcelo E. Valdes, Gary H. FoxAbstract:Abstract—Historically, failures of distribution transformers due to transient overvoltage phenomena have led to the development of resistor–capacitor Snubber Circuits for the protection of the transformer and winding insulation. These transients are most often observed when dry-type transformers are close coupled to vacuum switching devices. Typically, Snubber Circuit design has been specific for the particular application, and complex engineering studies were required. However, the design of a Snubber Circuit itself may be performed without these detailed studies. If Snubber studies are required, the procedures for system modeling and simulation are explained in a step-by-step manner.
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Snubber Circuit design for transformers in an urban high rise office building
IEEE Transactions on Industry Applications, 2015Co-Authors: Peter E. SutherlandAbstract:Transformer failures have in recent years led to the development of resistor-capacitor Snubber Circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the basic insulation level is exceeded, during turn-to-turn insulation, when there is excessive rate of change of voltage with time (dv/dt), and in switching devices by restrikes when the transient recovery voltage is exceeded. These transients are most often observed when dry-type transformers are closely coupled to vacuum switching devices. Some manufacturers are now including Snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building (where the space is limited and the available fault current is high), where the transformer enclosure includes built-in Snubber Circuits. The strengths and weaknesses of current methods are examined. Recommendations are made for improvements in Snubber Circuit design and analysis. © 1972-2012 IEEE.
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Analysis of integral Snubber Circuit design for transformers in urban high rise office building
Conference Record - Industrial and Commercial Power Systems Technical Conference, 2012Co-Authors: Peter E. SutherlandAbstract:Transformer failures have in recent years led to the development of Resistor-Capacitor Snubber Circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the Basic Insulation Level (BIL) is exceeded, turn-to-turn insulation when there is excessive rate of change of voltage with time (dv/dt), and to switching devices by restrikes when the Transient Recovery Voltage (TRV) is exceeded. These transients are most often observed when dry-type transformers are close coupled to vacuum switching devices. Some manufacturers are now including Snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building, where the space is limited and the available fault current is high, where the transformer enclosure includes built-in Snubber Circuits. The strengths and weaknesses of current methods are examined. Recommendations are made for improvements in Snubber Circuit design and analysis.
J.h.r. Enslin - One of the best experts on this subject based on the ideXlab platform.
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A regenerative snubbing technique using a self-oscillating DC to DC converter
Fifth Annual Proceedings on Applied Power Electronics Conference and Exposition, 1990Co-Authors: J.j. Smit, J.h.r. EnslinAbstract:The energy dissipated in a Snubber Circuit is proposed as a power supply for the control electronics and auxiliary equipment in a 5 kVA inverter. The power supply Circuit is initially supplied by the main DC supply but automatically changes to the Snubber Circuit as source when the Snubber capacitor voltage exceeds a threshold voltage. This increases the total efficiency and reliability of the power supply system, and its effect on the operation of the high-power converter is illustrated.
Tsunghsun Tsai - One of the best experts on this subject based on the ideXlab platform.
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high accuracy knee voltage detection for primary side control in flyback battery charger
IEEE Transactions on Circuits and Systems I-regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a $0.5\mu \text {m}$ BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
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High Accuracy Knee Voltage Detection for Primary-Side Control in Flyback Battery Charger
IEEE Transactions on Circuits and Systems I: Regular Papers, 2017Co-Authors: Shanghsien Yang, Tsunghsun Tsai, Hsin Chen, Chaochang Chiu, Kehorng Chen, Tsungyen TsaiAbstract:In a primary-side control flyback charger, the accuracy of a conventional knee voltage detection (KVD) approach to obtain the output voltage is influenced by the inclusion of a Snubber Circuit. Although the Snubber Circuit dampens the ringing voltages due to switching, it also affect the resonance frequency which would reduce the timing of the sampling Circuit, resulting in the inaccurate sampling of output voltage. By analyzing the Snubber Circuit and its resonance on the primary side, this paper implements a proposed accuracy knee voltage detection (AKVD) technique to compensate for the induced resonance frequency. Furthermore, the proposed constant current (CC) regulator ensures the accuracy of CC mode by compensating the sensing current error caused by the switching delay of the power transistor. A prototype consisting of a test chip fabricated with a 0.5μm BCD process demonstrates a voltage accuracy exceeding 99.63%. This is achieved by mitigating abnormal detections and thus ensuring correct control of charging current throughout the charging period.
