Canonical Model and Design Methodology for LLC DC/DC Converter With Constant Current Operation Capability Under Shorted Load

2016 ◽  
Vol 31 (10) ◽  
pp. 6870-6883 ◽  
Author(s):  
Feiyue Duan ◽  
Ming Xu ◽  
Xu Yang ◽  
Yuan Yao
Keyword(s):  
Design Methodology ◽  
Canonical Model ◽  
Constant Current ◽  
Current Operation

scholarly journals A Graphical Design Methodology Based on Ideal Gyrator and Transformer for Compensation Topology with Load-Independent Output in Inductive Power Transfer System

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 575
Author(s):  
Qian Su ◽  
Xin Liu ◽  
Yan Li ◽  
Xiaosong Wang ◽  
Zhiqiang Wang ◽  
...  
Keyword(s):  
Phase Angle ◽  
Design Methodology ◽  
Constant Current ◽  
Current Gain ◽  
Transfer System ◽  
Power Transfer ◽  
Current Output ◽  
Inductive Power Transfer ◽  
Zero Phase ◽  
Inductive Power

Compensation is crucial in the inductive power transfer system to achieve load-independent constant voltage or constant current output, near-zero reactive power, higher design freedom, and zero-voltage switching of the driver circuit. This article proposes a simple, comprehensive, and innovative graphic design methodology for compensation topology to realize load-independent output at zero-phase-angle frequencies. Four types of graphical models of the loosely coupled transformer that utilize the ideal transformer and gyrator are presented. The combination of four types of models with the source-side/load-side conversion model can realize the load-independent output from the source to load. Instead of previous design methods of solving the equations derived from the circuits, the load-independent frequency, zero-phase angle (ZPA) conditions, and source-to-load voltage/current gain of the compensation topology can be intuitively obtained using the circuit model given in this paper. In addition, not limited to only research of the existing compensation topology, based on the design methodology in this paper, 12 novel compensation topologies that are free from the constraints of transformer parameters and independent of load variations are stated and verified by simulations. In addition, a novel prototype of primary-series inductor–capacitance–capacitance (S/LCC) topology is constructed to demonstrate the proposed design approach. The simulation and experimental results are consistent with the theory, indicating the correctness of the design method.

Turbulence measurements with inclined hot-wires Part 2. Hot-wire response equations

1967 ◽  
Vol 28 (1) ◽  
pp. 177-182 ◽  
Author(s):  
F. H. Champagne ◽  
C. A. Sleicher
Keyword(s):  
Velocity Component ◽  
Wire Array ◽  
Tangential Velocity ◽  
Constant Current ◽  
Hot Wire ◽  
Tangential Velocity Component ◽  
Low Intensity ◽  
Hot Wires ◽  
Current Operation ◽  
Cosine Law

Hot-wire response equations to include the effects of the tangential velocity component as well as the non-linearities caused by high intensity turbulence are derived for linearized constant temperature operation. For low intensity turbulence similar equations are derived for constant current operation. The equations are applied to an X-wire array to determine the errors in selected turbulence quantities which arise from the assumption of cosine law cooling. The error depends upon the quantity measured, the method of operation, and [lscr ]/d. For [lscr ]/d = 200 the error ranges from 0 to 17%.

Electronic linearization of a d.c. electron-capture detector via constant-current operation

1981 ◽  
Vol 210 (3) ◽  
pp. 401-407 ◽  
Author(s):  
K.W.Michael Siu ◽  
Christopher M. Roper ◽  
Louis Ramaley ◽  
Walter A. Aue
Keyword(s):  
Electron Capture ◽  
Electron Capture Detector ◽  
Constant Current ◽  
Current Operation

scholarly journals Design of a HACCP Plan for Vacuum-Packed Beef Cuts

2020 ◽  
Vol 13 (9) ◽  
Author(s):  
Lucero Isaura Almeraya-Soberanes ◽  
Lenin G Guajardo- Hernández ◽  
Silvia Xochilt Almeraya-Quintero ◽  
Mario Salvador González-Rodríguez ◽  
Sonia Almeraya-Soberanes
Keyword(s):  
Design Methodology ◽  
Hazard Analysis ◽  
Control Measure ◽  
Control Point ◽  
Control Points ◽  
Critical Control Point ◽  
Critical Control Points ◽  
Process Study ◽  
Metal Detection ◽  
Current Operation

Objective: To elaborate a Hazard Analysis and Critical Control Points (HACCP) plan for the process of vacuum-packed beef cuts, in a Federal Inspection Type (FIT) meat processor located in eastern Estado de México, with the aim of improving its conditions of hygiene and innocuousness. Design/Methodology/Approximation: The activities performed in the business were revised applying the HACCP methodology and the dangers identified were analyzed, to determine whether the danger found was significant for the innocuousness of the food, finally concluding if it represented, or not, a critical control point (CCP). Results: A CCP was identified in the phase of metal detection, the dangers identified were the passing of metal      shards from the transport rails, pieces of knives or saws, and pieces of needles from prior steps in the process. Study limitations/implications: Documentation about case studies of beef cuts, as well as about management of their CCP is limited. Findings/Conclusions: The CCP1 Metal Detection is a control measure that the business performs; however, under analysis, there was evidence of an opportunity to improve the current operation, which is why the adaptation of registry formats that could allow monitoring and controlling the CCP was proposed.

Optimization of constant-current operation in membrane capacitive deionization (MCDI) using variable discharging operations

2021 ◽  
pp. 117646
Author(s):  
Zhizhao He ◽  
Shuai Liu ◽  
Boyue Lian ◽  
John Fletcher ◽  
Clare Bales ◽  
...  
Keyword(s):  
Constant Current ◽  
Capacitive Deionization ◽  
Current Operation

scholarly journals Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Daniel Ping-Kuen Tsang ◽  
Toshinori Matsushima ◽  
Chihaya Adachi
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Constant Current ◽  
Driving Voltage ◽  
Light Emitting ◽  
Organic Light ◽  
Hole Blocking Layer ◽  
Current Operation ◽  
The Stability

Abstract Organic light-emitting diodes (OLEDs) under constant current operation suffer from a decrease of luminance accompanied by an increase of driving voltage. We report a way to greatly improve the stability of OLEDs having a green emitter exhibiting thermally activated delayed fluorescence (TADF), (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN), by introducing ultrathin (1 to 3 nm) interlayers of 8-hydroxyquinolinato lithium (Liq) between hole-blocking layer and its surrounding emissive and electron-transport layers. Under constant current operation starting at a luminescence of 1,000 cd/m2, the time to reach 90% of initial luminance (LT90) increased eight times, resulting in LT90 = 1,380 hours after insertion of the interlayers. Combining this new concept and mixed host system, LT95 was further extended to 1315 hours that is 16 times of reference device. This is the best value reported for TADF-based OLEDs and is comparable to the operational lifetimes of well-established phosphorescence-based OLEDs. Thermally stimulated current measurements showed that the number of deep charge traps was reduced with the insertion of the ultrathin Liq interlayer, indicating that reducing the number of deep traps is important for improving the operational lifetime and that exciton-polaron annihilation may be a source of the device degradation.

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