Isolated Two Inductor Boost Converter Start-up and Steady State Operation with any Output Voltage

2007 ◽  
Author(s):  
L.A. Flores ◽  
O. Garcia ◽  
A. Roman ◽  
F. Rizo ◽  
L.E. Arambula
Keyword(s):  
Steady State ◽  
Output Voltage ◽  
Boost Converter ◽  
Steady State Operation ◽  
Start Up

scholarly journals Two-inductor Boost Converter Start-up And Steady-state Operation

2010 ◽  
Vol 15 (3) ◽  
pp. 143-149
Author(s):  
Luis A. Flores-Oropeza ◽  
Alejandro Román-Loera ◽  
Jorge E. Macías-Díaz ◽  
Felipe de J. Rizo-Díaz
Keyword(s):  
Steady State ◽  
Boost Converter ◽  
Steady State Operation ◽  
Start Up

scholarly journals Discrete Sliding Mode Control Strategy for Start-Up and Steady-State of Boost Converter

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2990
Author(s):  
Yang ◽  
Liao
Keyword(s):  
Steady State ◽  
Sliding Mode Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Boost Converter ◽  
Lyapunov Theory ◽  
Signal Model ◽  
Switching Surface ◽  
Mode Control ◽  
Start Up

Since the zero initial conditions of the boost converter are far from the target equilibrium point, the overshoot of the input current and the output voltage will cause energy loss during the start-up process when the converter adopts the commonly used small-signal model design control method. This paper presents a sliding mode control strategy that combines two switching surfaces. One switching surface based on the large-signal model is employed for the start-up to minimize inrush current and voltage overshoot. The stability of this strategy is verified by Lyapunov theory and simulation. Once the converter reaches the steady-state, the other switching surface with PI compensation of voltage error is employed to improve the robustness. The latter switching surface, which is adopted to regulate the voltage, can not only suppress the perturbation of input voltage and load, but also achieve a better dynamic process and a zero steady-state error. Furthermore, the discrete sliding mode controller is implemented by digital signal processor (DSP). Finally, the results of simulation, experiment and theoretical analysis are consistent.

scholarly journals Concurrent operation of 10 gyrotrons at W7-X experience and improvement opportunities

2018 ◽  
Vol 187 ◽  
pp. 01003 ◽  
Author(s):  
H. Braune ◽  
K.J. Brunner ◽  
H.P. Laqua ◽  
S. Marsen ◽  
D. Moseev ◽  
...  
Keyword(s):  
Steady State ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Heating System ◽  
Current Drive ◽  
Electron Cyclotron Resonance Heating ◽  
Neutral Gas ◽  
Steady State Operation ◽  
Start Up ◽  
Operation Phase

At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017. The ECRH, equipped with 10 operational 140 GHz gyrotrons [1], was used for different tasks at W7-X such as wall conditioning, controlled plasma start-up from the neutral gas up to steady state plasma control and different heating scenarios such as X2-mode and O2-mode heating as well as current drive (ECCD). The operational experiences and improvement opportunities of the ECRH plant will be discussed.

An Ultra-Low-Power, Self-Start-Up DC-DC Boost Converter for Self-Powered IoT Node

2021 ◽  
pp. 2250026
Author(s):  
Krishna Reddy Komatla ◽  
Sreehari Rao Patri
Keyword(s):  
Charge Transfer ◽  
Low Power ◽  
Output Voltage ◽  
Low Voltage ◽  
Boost Converter ◽  
Switching Loss ◽  
Ultra Low Power ◽  
Start Up ◽  
Self Powered ◽  
Iot Devices

This paper presents an ultra-low-power boost converter for self-powered IoT applications to self-start and power-up IoT devices from scratch without any requirement of an external start-up. The proposed converter and its clock generator operate in sub-threshold utilizing bulk-driven technique for low-power operation. The bulk-driven technique improves charge transfer switches for effective switching using auxiliary transistors. This approach enables a MOSFET to operate on supplies lower than its threshold voltage with a significant reduction in the reverse charge transfer and switching loss while increasing the voltage conversion efficiency and output voltage. To validate the performance of the proposed architecture, the post-layout simulation is carried out in standard CMOS 0.18[Formula: see text][Formula: see text]m technology. Under low-voltage supply of 0.4[Formula: see text]V, the simulated transient output voltage takes 110[Formula: see text][Formula: see text]s to reach 1.92[Formula: see text]V with 0.15[Formula: see text] output voltage ripple, while consuming the power of 772[Formula: see text]nW.

scholarly journals An improved MPPT algorithm to minimize transient and steady state oscillation conditions for small SPV systems

2018 ◽  
Vol 7 (3) ◽  
pp. 191-197 ◽  
Author(s):  
Kashif Javed ◽  
Haroon Ashfaq ◽  
Rajveer Singh
Keyword(s):  
Steady State ◽  
Output Voltage ◽  
Low Cost ◽  
Boost Converter ◽  
Photovoltaic System ◽  
Variable Load ◽  
Solar Pv ◽  
Pv Systems ◽  
Steady State Oscillation ◽  
Transient And Steady State

Small solar PV systems mostly residential PV systems are bounded to be low cost. So these systems are required low-cost processors, and these low-cost processors can only process simple algorithm efficiently. The conventional P&O MPPT algorithm is widely employed algorithm to control solar PV systems because of its simplicity, low cost, and ease of implementation. During rapid radiation change condition (RRC) the output voltage of conventional P&O MPPT algorithm is found unstable and suffers oscillations around MPP at transient and steady state conditions. This paper proposes a simple MPPT algorithm for small or residential solar PV systems to eliminate such above said drawbacks. The proposed MPPT controls the step size (dD) of the boost converter duty cycle (D) according to the system input conditions and have the ability to compensate the transient as well as steady-state oscillations around MPP and stabilize the output voltage under RRC and variable load conditions. To validate the proposed algorithm, a 1kW photovoltaic system model is simulated using MATLAB/Simulink, and the performance of the system is also investigated under RRC. The performance of proposed MPPT algorithm is found to be adequate under various insolation patterns. An experimental set-up comprising a boost converter, solar emulator with dSPACE controller is also used to investigate the performance of proposed MPPT algorithm further.Article History: Received October 4th 2017; Received in revised form September 15th 2018; Accepted November 1st 2018; Available onlineHow to Cite This Article: Javed, K. Ashfaq, H and Singh, R. (2018). An Improved MPPT Algorithm to Minimize Transient and Steady State Oscillation Conditions for Small SPV Systems. International Journal of Renewable Energy Development, 7(3), 191-197.http://dx.doi.org/10.14710/ijred.7.3.191-197

Inrush Current Effects on SiC-MOSFETs for LLC Converter

2020 ◽  
Vol 1004 ◽  
pp. 1134-1140
Author(s):  
Yoshimasa Takaku ◽  
Hikaru Tanaka ◽  
Yosei Takada ◽  
Shuhei Nakata
Keyword(s):  
Steady State ◽  
Pulse Current ◽  
Energy Conversion Efficiency ◽  
Inrush Current ◽  
High Current ◽  
Current Waveform ◽  
Steady State Operation ◽  
Start Up ◽  
Pulse Experiment ◽  
Gan Fet

We prototyped an LLC converter using SiC-MOSFET and GaN-FET to study the device dependence of the resonant type converter characteristics and high current effects on the devices during the start-up mode.Under steady state operation, no observable difference exists between the SiC-MOSFET and GaN-FET in current and voltage waveforms and energy conversion efficiency is over 96% regardless of the device used.However, significant differences exist during the start-up mode. As for the SiC-MOSFET, the inrush current is at maximum in the first few cycles and gradually decreases to steady state. As for the effects on the device, there are no characteristic changes or current waveform fluctuation during the start-up period even after 50 repetitions.Alternately, in the case of GaN-FET, the maximum inrush current is at the first cycle and decreases rapidly to half only a few cycles later. The multi-pulse experiment shows that a single high current pulse degrades the I-V characteristics of the device and the subsequent pulse current decreases. It is also noted that the degradation could be overcome by a longer interval after the high current, however, no further improvement is seen above a 20 µs interval.

Feed Material Influence on the Dynamics of the Suspended Screen at Its Steady State Operation and Transient States

2017 ◽  
Vol 62 (1) ◽  
pp. 145-161 ◽  
Author(s):  
Jerzy Michalczyk ◽  
Łukasz Bednarski ◽  
Marek Gajowy
Keyword(s):  
Steady State ◽  
Simulation Model ◽  
Feed Material ◽  
Transient States ◽  
Steady State Operation ◽  
Start Up ◽  
Steady Vibrations ◽  
Transient Resonance ◽  
Half Turn

Abstract The influence of the feed material on steady vibrations as well as on the transient resonance during the start-up and coasting of the suspended screen, was analysed in the hereby paper. The influence of the feed material presence on the possibility of performing the first half-turn of the vibrator was also established. The original, feed material simulation model reflecting its layer properties and diversification of feed particles vibrations along the screen riddle – specially developed for this aim – was applied in investigations.

Anaerobic digestion of high-sulphate-content wastewater from the industrial production of citric acid

1994 ◽  
Vol 30 (12) ◽  
pp. 263-273 ◽  
Author(s):  
E. Colleran ◽  
S. Finnegan ◽  
R. B. O'Keeffe
Keyword(s):  
Steady State ◽  
Citric Acid ◽  
Fixed Bed ◽  
Full Scale ◽  
Sulphate Content ◽  
Methanogenic Activity ◽  
Term Operation ◽  
Steady State Operation ◽  
Start Up

The start-up and steady-state operation of a full-scale fixed bed digester treating citric acid production wastewater with an estimated COD/sulphate ratio of approximately 4 are described. Parallel studies at laboratory-scale with two reactors, one of which received the same high influent sulphate concentration as the full-scale plant, confirmed the finding that methanogenesis was not inhibited by the level of sulphate reduction shown to occur. After long-term operation on a high sulphate influent, the retained biomass in the laboratory and full-scale reactors displayed a very low specific methanogenic activity against propionate and butyrate. Since propionate and butyrate were barely detectable in the effluents at steady-state, their oxidation under high influent sulphate conditions may be completely or incompletely mediated by fatty-acid-utilising SRB.

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