Results 221 to 230 of about 82,647 (261)

Patch Clamp Studies Of Lymphocyte Activation

Annual Review of Immunology, 1990
In both T- and B-lymphocyte activation, antigen receptor or mitogen stimulation results in phosphoinositide turnover, generation of InsP3 and diacylglycerol, and a sustained rise in intracellular Ca2+, from both intracellular Ca2+ stores release and enhanced transmembrane Ca2+ influx. There is also an associated K+ efflux and membrane hyperpolarization.
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Dual Series-Resonant Active-Clamp Converter

IEEE Transactions on Industrial Electronics, 2008
A dual series-resonant active-clamp dc-dc converter is proposed to obtain high efficiency. The proposed converter employs an active-clamp technique, while a series-resonant scheme controls the output voltage with the complementary pulsewidth modulation controller. The active-clamp circuit serves to recycle the energy stored in the leakage inductance or
Lee, JJ, Kwon, JM, Kim, EH, Kwon, BH
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The ZVS-PWM Active-Clamping CUK Converter

IEEE Transactions on Industrial Electronics, 2004
A CUK converter featuring clamping action, pulsewidth modulation, and soft-switching commutation is proposed to overcome the limitations of the conventional CUK converter. As the resonant circuits absorb almost all parasitic reactances of switches, including transistor output capacitances, this converter is suitable for high-frequency operation ...
Douglas Braz Costa, Cláudio Manoel C. Duarte   +1 more
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Effect of clamp capacitor on the stability of active-clamp DC-DC converters

PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196), 2002
This paper discusses the effect of an active-clamp circuit on the dynamic characteristics of a basic converter topology such as a buck-boost power converter. The buck-boost converter has instability problems such as a jumping phenomenon and an oscillation of the output voltage. Recently, the authors have found an unstable phenomenon due to inserting an
Y. Hakoda, T. Ninomiya, M. Shoyama, T. Hashimoto   +3 more
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A Multilevel Active-Clamped Converter Topology—Operating Principle

IEEE Transactions on Industrial Electronics, 2011
This paper presents a novel multilevel activeclamped converter topology, which is an extension to m levels of the three-level active neutral-point-clamped topology. The operating principle is established through the definition of a proper set of switching states and a transition strategy between adjacent switching states.
Busquets Monge, Sergio, Nicolás Apruzzese, Joan   +1 more
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Active-clamping dual resonant converter

2009 IEEE International Symposium on Industrial Electronics, 2009
A dual resonant converter using active clamp circuit is presented in this paper. The active clamp circuit is employed to limit the voltage stress and create zero-voltage-switching (ZVS) turn-on feature for power switches. Moreover, the dual resonant tanks are composed by the leakage inductors and resonant capacitors to achieve zero-current-switching ...
J.-J. Chen, B.-R. Lin, M.-H. Yu, H.-K. Chiang   +3 more
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Lossless active clamp for secondary circuits

INTELEC - Twentieth International Telecommunications Energy Conference (Cat. No.98CH36263), 2002
Lossless snubbers have been developed with the emphasis on snubbing the primary side switches. With the switching losses in the primary being minimised, the secondary diode losses become a major limiting factor of converter operating frequency and total efficiency. To address this problem, a new active lossless clamp for secondary diodes of switch mode
J. Dekter, N. Machin, R. Sheehy
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Active Clamp ZVS Converters with Multipliers

2005 International Conference on Power Electronics and Drives Systems, 2006
The technique of active clamp is widely applied in single end converters for the perfect performance. In this paper the author combined the active clamp technology with multipliers, and formed the topology of ZVS single end converters with multipliers.
null Jianbing Li, null Yujie Shi, null Zhongxia Niu, null Dongfang Zhou   +3 more
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Active Clamp ZVT Boost Converter

2006 1ST IEEE Conference on Industrial Electronics and Applications, 2006
In this paper, the technique of active clamp is applied in ZVT boost converter and forms active clamp ZVT boost converter. This converter is not only simple in topology but also achieves ZVT in both the main switch and the auxilary switch. The boost diode turns off naturally and there is no reverse recovery loss.
Jianbing Li, Yujie Shi, Zhongxia Niu, Dongfang Zhou   +3 more
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Improved active clamp for secondary circuits

INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131), 2002
The paper describes improvements to an active clamp for secondary circuits in isolated converter topologies. The active clamp provides both voltage clamping of the secondary diodes and the recycling of diode reverse recovery energy stored in the leakage inductance of the transformer secondary winding.
R. Sheehy, J. Dekter, N. Machin
openaire   +1 more source