The Experts below are selected from a list of 828 Experts worldwide ranked by ideXlab platform
Zhang Chong-jin - One of the best experts on this subject based on the ideXlab platform.
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The Key Technologies of the Synchronous Buck Circuit in an Active Load
IEEE Transactions on Power Electronics, 2013Co-Authors: Zhang Chong-jinAbstract:This paper discusses the operational status of the synchronous Buck converter respectively working in continuous current mode(CCM) and discontinuous current mode(DCM) with an active load,and proposes a protection method whose effectiveness is verified through practical Circuit to prevent the current backflow.Based on the protection technology,the control methods of soft-starting and pulse frequency modulation(PFM) and pulse width modulation(PWM) of the synchronous Buck converter are achieved.
Gong Chun-ying - One of the best experts on this subject based on the ideXlab platform.
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Analysis and Design of a Soft-switching Buck Circuit
IEEE Transactions on Power Electronics, 2013Co-Authors: Gong Chun-yingAbstract:The detailed operational principle of the passive lossless snubber Circuit with coupled-inductor which is suitable for high power situations is analyzed.The zero current switching(ZCS) turn-on and zero voltage switching(ZVS) turn-off of the power switch can be realized from resonance between the leakage inductance of coupled-inductor and snubber capacitor.An optimal engineering design method for resonant devices in this Circuit is proposed.Thus,a prototype is constructed to verify the design of the snubber,and the simulation and experimental waveforms are provided as well.The results show that the snubber Circuit can achieve soft-switching in a wide range of duty cycle,and full load efficiency of 97.6%is observed.
Guo Tang - One of the best experts on this subject based on the ideXlab platform.
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Research on a Novel DC/DC Converter Using Double-voltage Controlled PWM
IEEE Transactions on Power Electronics, 2002Co-Authors: Guo TangAbstract:Because of the ripple of the input DC power supply in the DC/DC Circuit, the output harmonic amplitude of the voltage controlled by the single voltage feedback controlled PWM converter is high, and the dynamic response is much slow. In this paper, a novel methodology to realize double voltage PWM control is presented, which is adapted to the ripple of the DC power supply system, and the control rule in Buck Circuit is presented.
Xiaoyong Ren - One of the best experts on this subject based on the ideXlab platform.
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Two-stage Interleaving DC/DC Topology Based on Phase-shift Full bridge Converter
2018 IEEE International Conference on Electrical Systems for Aircraft Railway Ship Propulsion and Road Vehicles & International Transportation Electri, 2018Co-Authors: Cheng Pu, Chenmao Shao, Zhenyang Hao, Xiaoyong RenAbstract:Two-stage DC/DC converter usually adopts the structure of phase-shift full bridge and Buck Circuit. This paper introduces the topology and principle of two-stage DC/DC converter. The pre-stage phase-shift full bridge Circuit realizes soft switch by phase-shift control, so it reduces switch loss. The Buck Circuit can realize closed loop control to output a fixed voltage. It's suggested that the output current ripple could be gotten a well inhibition when the interleaving parallel technology is applied, so it increases output power. The hardware and software of the system are designed by TMS28335. Finally, a 5kW-converter is designed whose maximum input voltage is 700V and output voltage is 250V-550V, then the experimental results are given.
Zhang Feng - One of the best experts on this subject based on the ideXlab platform.
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The Loss Calculation of the MOSFET in Synchronous Buck Circuit
IEEE Transactions on Power Electronics, 2007Co-Authors: Zhang FengAbstract:The synchronous Buck Circuit is in widespread use to provide high current,low voltage power for CPU's,chipsets,peripherals etc.Typically,it is used to convert supply from a 12V or 5V,to an outputs as low as 0.7V for low voltage CPUs made in sub-micron technologies.The majority of the power losses in the conversion process is the losses in the power MOSFET switches.The profiles of loss for the high-side and low-side MOSFET are quite different.These low out-put voltage converters have low duty cycles,and the majority of the conduction loss concentrates in the low-side MOSFET.For the high side MOSFET,the loss is caused by the switches,named the switching loss.At the end of the thesis,we use the formulas and conclusion drawn before to calculate the loss of the CPU Circuit on the server board,which will be com-pared to the test results in order to validate the correctness.
