A new three-phase interleaved isolated boost converter with active clamp for fuel cells

2008 ◽  
Author(s):  
Hanju Cha ◽  
Jungwan Choi ◽  
Byung-moon Han
Keyword(s):  
Fuel Cells ◽  
Boost Converter ◽  
Three Phase ◽  
Active Clamp

A Three-Phase Interleaved DC–DC Converter With Active Clamp for Fuel Cells

2010 ◽  
Vol 25 (8) ◽  
pp. 2115-2123 ◽  
Author(s):  
Jungwan Choi ◽  
Hanju Cha ◽  
Byung-Moon Han
Keyword(s):  
Fuel Cells ◽  
Three Phase ◽  
Active Clamp

A 5kW Zero Voltage Switch Space Vector Modulation (ZVS-SVM) Controlled Three-Phase Boost Converter

2012 ◽  
Vol 433-440 ◽  
pp. 7200-7207
Author(s):  
Decha Panprasert ◽  
Wara Sadara ◽  
Bunlung Neammanee
Keyword(s):  
Harmonic Distortion ◽  
Boost Converter ◽  
Switching Frequency ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Power Circuit ◽  
Three Phase ◽  
Active Clamp ◽  
Vector Modulation ◽  
Zero Voltage

This paper proposes a 5kW zero voltage switch space vector modulation (ZVS-SVM) controlled three-phase boost converter. A power circuit of this converter is modified from the conventional three phase boost rectify by combine the active clamp branch. A branch composed of an active switch, a resonant inductor and a clamping capacitor. By used the control techniques to active clamp, the ZVS are occurring at the power switching components. The simulation results can confirm the superiority of this topology to increase the system efficiency up 98 percent. The system has fast response, low total harmonic distortion and steady state error with unity power factor. Moreover, both the main and the auxiliary switches have the same and fixed switching frequency.

scholarly journals Active Clamp Boost Converter with Blanking Time Tuning Considered

2021 ◽  
Vol 11 (2) ◽  
pp. 860
Author(s):  
Yeu-Torng Yau ◽  
Kuo-Ing Hwu ◽  
Yu-Kun Tai
Keyword(s):  
Boost Converter ◽  
Zero Current Switching ◽  
Active Clamp ◽  
Overall Efficiency ◽  
Auto Tuning ◽  
Voltage Spike ◽  
Resonant Inductor ◽  
Off Time ◽  
Conduction Mode ◽  
Time Point

An active clamp boost converter with blanking time auto-tuned is presented herein, and this is implemented by an additional auxiliary switch, an additional resonant inductor, and an additional active clamp capacitor as compared with the conventional boost converter. In this structure, both the main and auxiliary switches have zero voltage switching (ZVS) turn-on as well as the output diode has zero current switching (ZCS) turn-off, causing the overall efficiency of the converter to be upgraded. Moreover, as the active clamp circuit is adopted, the voltage spike on the main switch can be suppressed to some extent whereas, because of this structure, although the input inductor is designed in the continuous conduction mode (CCM), the output diode can operate with ZCS turn-off, leading to the resonant inductor operating in the discontinuous conduction mode (DCM), hence there is no reverse recovery current during the turn-off period of the output diode. Furthermore, unlike the existing soft switching circuits, the auto-tuning technique based on a given look-up table is added to adjust the cut-off time point of the auxiliary switch to reduce the current flowing through the output diode, so that the overall efficiency is upgraded further. In this paper, basic operating principles, mathematic deductions, potential designs, and some experimental results are given. To sum up, the novelty of this paper is ZCS turn-off of the output diode, DCM operation of the resonant inductor, and auto-tuning of cut-off time point of the auxiliary switch. In addition, the efficiency of the proposed converter can be up to 96.9%.

Soft-Switching AC-Link Three-Phase AC–AC Buck–Boost Converter

2015 ◽  
Vol 62 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Mahshid Amirabadi ◽  
Jeihoon Baek ◽  
Hamid A. Toliyat ◽  
William C. Alexander
Keyword(s):  
Boost Converter ◽  
Soft Switching ◽  
Three Phase

Effect of Bi-Layer Interconnector Design on the Current Density of Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Qiuyang Chen ◽  
Jian Zhang ◽  
Qiuwang Wang ◽  
Min Zeng
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Porous Electrode ◽  
Solid Oxide ◽  
The Novel ◽  
Oxide Fuel ◽  
Plane Normal ◽  
Three Phase ◽  
Porous Anode

The concentration gradient of fuel and oxidant gas is great in the plane normal to the solid oxide fuel cells (SOFC) three-phase-boundary (TPB) layer, especially in the porous electrode. We present a novel interconnector design, termed bilayer interconnector, for SOFC. It can distribute the fuel and air gas in the plane normal to the SOFC TPB layer. In this paper, we develop a 3D model to study the current density of the SOFC with conventional and novel bi-layer interconnectors. The numerical results show that the novel SOFC design Rib1 can slightly enhance the mass transfer in the porous anode and current density. The novel SOFC design Rib2 can improve the current density significantly under low electrical conductivity of interconnector.

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