The Experts below are selected from a list of 1149 Experts worldwide ranked by ideXlab platform
Liangchen Shi - One of the best experts on this subject based on the ideXlab platform.
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a soft switching full bridge converter with reduced Parasitic Oscillation in a wide load range
IEEE Transactions on Power Electronics, 2014Co-Authors: Zhong Chen, Shasha Liu, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of an auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480-W/48-V, 100-kHz prototype are presented to confirm the superior features of the proposed converter.
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soft switching full bridge converter with a wide zvs range and reduced Parasitic Oscillation
Energy Conversion Congress and Exposition, 2013Co-Authors: Zhong Chen, Shasha Liu, Yang Wang, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation (PWM) full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480W/48V, 100 kHz prototype are presented to confirm the superior features of the proposed converter.
M. Q. Tran - One of the best experts on this subject based on the ideXlab platform.
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Parasitic Oscillations in Smooth-Wall Circular Symmetric Gyrotron Beam Ducts
Journal of Infrared Millimeter and Terahertz Waves, 2019Co-Authors: J. Genoud, G. Le Bars, Stefano Alberti, P. Kaminski, Trach-minh Tran, J.-ph. Hogge, K. A. Avramidis, M. Q. TranAbstract:In order to study Parasitic Oscillation that may occur in a realistic beam duct upstream to the gyrotron cavity, the self-consistent linear and spectral code TWANGlinspec has been modified. The large inhomogeneities in the smooth-wall beam duct geometry or in the magnetic field profile required the implementation of a numerical approach using a hybrid finite element method. The new model permits to characterize a large number of potentially spurious TE modes. Compared to previous studies on gyrotron beam duct instabilities, an extended interaction space including also the gyrotron cavity has been considered. The role of the connecting part between the beam duct and the cavity, called spacer, is highlighted and it is shown that the gyro backward-wave TE modes excited in this region generally have their minimum starting current. The sensitivity of the minimum starting current on electron beam velocity spread is also evaluated.
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Parasitic Oscillation in and suppression of a gyrotron backward wave mode in a low q 8 ghz gyrotron
IEEE Transactions on Plasma Science, 1992Co-Authors: P Muggli, M. Q. Tran, T M TranAbstract:The Parasitic Oscillation of the TE degrees /sub 21/ gyrotron backward-wave (gyro BW) mode is observed in a low-Q, 8 GHz TE degrees /sub 011/, gyrotron. At low power (P/sub BW/ >
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Parasitic Oscillation in and suppression of a gyro bw mode in a low q 8ghz gyrotron
1991Co-Authors: P Muggli, M. Q. Tran, T M TranAbstract:Keywords: LRP 447 Reference CRPP-REPORT-1991-018 Record created on 2008-04-18, modified on 2017-05-12
Zhong Chen - One of the best experts on this subject based on the ideXlab platform.
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a soft switching full bridge converter with reduced Parasitic Oscillation in a wide load range
IEEE Transactions on Power Electronics, 2014Co-Authors: Zhong Chen, Shasha Liu, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of an auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480-W/48-V, 100-kHz prototype are presented to confirm the superior features of the proposed converter.
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soft switching full bridge converter with a wide zvs range and reduced Parasitic Oscillation
Energy Conversion Congress and Exposition, 2013Co-Authors: Zhong Chen, Shasha Liu, Yang Wang, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation (PWM) full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480W/48V, 100 kHz prototype are presented to confirm the superior features of the proposed converter.
Ben Hongqi - One of the best experts on this subject based on the ideXlab platform.
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analysis and control of Parasitic Oscillation of the output rectifier bridge in dc dc converter
IEEE Transactions on Power Electronics, 2009Co-Authors: Ben HongqiAbstract:By considering the leakage inductance of the transformer and Parasitic parameters of the diode,an equivalent model of current commutation of rectifiers in transformer's second side of isolated DC/DC converter is built.Using this model,the cause of Parasitic Oscillation of the output rectifier bridge is analyzed.The effects of electrical parameters on the Parasitic Oscillation are discussed and several methods to suppress the Parasitic Oscillation are introduced,merits and faults of each method are given.RC snubber circuit is used in the design of 13 kW phase-shifted full-bridge converter.Experimental results show that RC snubber circuit can suppress the Parasitic Oscillation of the output rectifier bridge effectively.
Shasha Liu - One of the best experts on this subject based on the ideXlab platform.
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a soft switching full bridge converter with reduced Parasitic Oscillation in a wide load range
IEEE Transactions on Power Electronics, 2014Co-Authors: Zhong Chen, Shasha Liu, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of an auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480-W/48-V, 100-kHz prototype are presented to confirm the superior features of the proposed converter.
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soft switching full bridge converter with a wide zvs range and reduced Parasitic Oscillation
Energy Conversion Congress and Exposition, 2013Co-Authors: Zhong Chen, Shasha Liu, Yang Wang, Liangchen ShiAbstract:A phase-shift zero voltage switching (ZVS) pulse width modulation (PWM) full-bridge converter with reduced Parasitic Oscillation across the rectifier is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance. Parasitic voltage Oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range with the help of auxiliary coupled inductor, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and ripple current flowing through the output filter inductor decreases significantly. In this paper, operation principle of the circuit is analyzed in detail. Besides, discussion of key characteristics and design considerations are also included. Finally, experimental results from a 480W/48V, 100 kHz prototype are presented to confirm the superior features of the proposed converter.
