Kyrgyz president gains greater but not absolute power

2021 ◽  
Keyword(s):  
Total Power ◽  
Content Type ◽  
Absolute Power

Headline KYRGYZSTAN: Japarov wins greater but not total power

Application of cascode level shifter for EMI reduction in LCD driver IC

2015 ◽  
Vol 32 (2) ◽  
pp. 73-80 ◽  
Author(s):  
Soo-Woo Kim ◽  
Ho-Yong Choi ◽  
Sehyuk An ◽  
Nam-Soo Kim
Keyword(s):  
Current Source ◽  
Cmos Technology ◽  
Total Power ◽  
Noise Power ◽  
Content Type ◽  
Switching Current ◽  
Lcd Driver ◽  
Driver Circuit ◽  
Level Shifter ◽  
Emi Reduction

Purpose – This paper aims to design the circuit for electromagnetic interface (EMI) reduction in liquid crystal display (LCD). Design/methodology/approach – The cascode level shifter and segmented driver circuit are applied in LCD column driver integrated circuit (IC) for EMI reduction. Cascode current mirror is used in the proposed level shifter for DC voltage biasing and reduction of the driving current which passes through the level shifter. The on-off switching currents and transient times are measured and compared between the conventional and proposed level shifters. Additionally, a segmented data latch is obtained by the timing spread solution in data latch, and applied to split the large peak switching current into a number of smaller peak current. The timing spread-operation does not actually reduce the total power of the noise, instead, it spreads the noise power evenly over the frequency bandwidth. The optimal number of latch is dependent on the operating frequency and EMI allowance. The column driver IC and clock controller are integrated in 0.18 μm CMOS technology with 1-poly and 4-metal process. Findings – The post-layout simulation shows that the proposed column driver circuit for LCD driver IC significantly reduces the peak switching current, and it results in the reduction of EMI noise level by more than 15 dB. It is obtained with 20 segmented operations in data latch at 40 MHz frequency. Originality/value – The advantage of the cascode current source is that it can provide a well-controlled bias current with an accurate current transfer ratio. To reduce the EMI noise in LCD driver circuit, the cascode current source is properly located for the DC bias block in the level shifter. The application is rarely done by others, and a significant EMI noise reduction is found. The well-controlled current source provides a high performance switching in the level shifter.

Modeling and validation of stray-field loss inside magnetic and non-magnetic components under harmonics-DC hybrid excitations based on updated TEAM Problem 21

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhiguang Cheng ◽  
Behzad Forghani ◽  
Zhenbin Du ◽  
Lanrong Liu ◽  
Yongjian Li ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Magnetic Flux ◽  
Total Power ◽  
Electromagnetic Analysis ◽  
Stray Field ◽  
Content Type ◽  
Magnetic Components ◽  
Analysis Methods ◽  
Load Component ◽  
Magnetic Flux Compensation

Purpose This paper aims to propose and establish a set of new benchmark models to investigate and confidently validate the modeling and prediction of total stray-field loss inside magnetic and non-magnetic components under harmonics-direct current (HDC) hybrid excitations. As a new member-set (P21e) of the testing electromagnetic analysis methods Problem 21 Family, the focus is on efficient analysis methods and accurate material property modeling under complex excitations. Design/methodology/approach This P21e-based benchmarking covers the design of new benchmark models with magnetic flux compensation, the establishment of a new benchmark measurement system with HDC hybrid excitation, the formulation of the testing program (such as defined Cases I–V) and the measurement and prediction of material properties under HDC hybrid excitations, to test electromagnetic analysis methods and finite element (FE) computation models and investigate the electromagnetic behavior of typical magnetic and electromagnetic shields in electrical equipment. Findings The updated Problem 21 Family (V.2021) can now be used to investigate and validate the total power loss and the different shielding performance of magnetic and electromagnetic shields under various HDC hybrid excitations, including the different spatial distributions of the same excitation parameters. The new member-set (P21e) with magnetic flux compensation can experimentally determine the total power loss inside the load-component, which helps to validate the numerical modeling and simulation with confidence. The additional iron loss inside the laminated sheets caused by the magnetic flux normal to the laminations must be correctly modeled and predicted during the design and analysis. It is also observed that the magnetic properties (B27R090) measured in the rolling and transverse directions with different direct current (DC) biasing magnetic field are quite different from each other. Research limitations/implications The future benchmarking target is to study the effects of stronger HDC hybrid excitations on the internal loss behavior and the microstructure of magnetic load components. Originality/value This paper proposes a new extension of Problem 21 Family (1993–2021) with the upgraded excitation, involving multi-harmonics and DC bias. The alternating current (AC) and DC excitation can be applied at the two sides of the model’s load-component to avoid the adverse impact on the AC and DC power supply and investigate the effect of different AC and DC hybrid patterns on the total loss inside the load-component. The overall effectiveness of numerical modeling and simulation is highlighted and achieved via combining the efficient electromagnetic analysis methods and solvers, the reliable material property modeling and prediction under complex excitations and the precise FE computation model using partition processing. The outcome of this project will be beneficial to large-scale and high-performance numerical modeling.

scholarly journals High-speed Cherry Hooper flash analog-to-digital converter

2017 ◽  
Vol 34 (1) ◽  
pp. 22-29 ◽  
Author(s):  
Nicolaas Faure ◽  
Saurabh Sinha
Keyword(s):  
High Speed ◽  
Group Delay ◽  
Differential Amplifier ◽  
Total Power ◽  
Input Tree ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Content Type ◽  
Analog To Digital ◽  
Technology Node

Purpose The 60 GHz unlicensed band is being utilized for high-speed wireless networks with data rates in the gigabit range. To successfully make use of these high-speed signals in a digital system, a high-speed analog-to-digital converter (ADC) is necessary. This paper aims to present the use of a common collector (CC) input tree and Cherry Hooper (C-H) differential amplifier to enable analog-to-digital conversion at high frequencies. Design/methodology/approach The CC input tree is designed to separate the input Miller capacitance of each comparator stage. The CC stages are biased to obtain bandwidth speeds higher than the comparator stages while using less current than the comparator stages. The C-H differential amplifier is modified to accommodate the low breakdown voltages of the technology node and implemented as a comparator. The comparator stages are biased to obtain a high output voltage swing and have a small signal bandwidth up to 29 GHz. Simulations were performed using foundry development kits to verify circuit operation. A two-bit ADC was prototyped in IBM’s 130 nm SiGe BiCMOS 8HP technology node. Measurements were carried out on test printed circuit boards and compared with simulation results. Findings The use of the added CC input tree showed a simulated bandwidth improvement of approximately 3.23 times when compared to a basic flash architecture, for a two-bit ADC. Measured results showed an effective number of bits (ENOB) of 1.18, from DC up to 2 GHz, whereas the simulated result was 1.5. The maximum measured integral non-linearity and differential non-linearity was 0.33 LSB. The prototype ADC had a figure of merit of 42 pJ/sample. Originality/value The prototype ADC results showed that the group delay for the C-H comparator plays a critical role in ADC performance for high frequency input signals. For minimal component variation, the group delay between channels deviate from each other, causing incorrect output codes. The prototype ADC had a low gain which reduced the comparator performance. The two-bit CC C-H ADC is capable of achieving an ENOB close to 1.18, for frequencies up to 2 GHz, with 180 mW total power consumption.

Impact of integrated HSE management system on power generation in Iran by a unique mathematical programming approach

2016 ◽  
Vol 13 (1) ◽  
pp. 82-90 ◽  
Author(s):  
A. Azadeh ◽  
S. Motevali Haghighi ◽  
M. Hosseinabadi Farahani ◽  
R. Yazdanparast
Keyword(s):  
Power Generation ◽  
Performance Assessment ◽  
Power Plants ◽  
Electrical Power ◽  
Labor Cost ◽  
Total Power ◽  
Programming Approach ◽  
Content Type ◽  
Mathematical Programming Approach ◽  
Installed Capacity

Purpose Concern for health, safety and environment (HSE) is increasing in many developing countries, especially in energy industries. Improving power plants efficiencies in terms of HSE issues requires considering these issues in performance assessment of power generation units. This study aims to discuss the use of data envelopment analysis methodology for the performance assessment of electrical power plants in Iran by considering HSE and conventional indicators. Design/methodology/approach Installed capacity, fuel consumption, labor cost, internal power, forced outage hours, operating hours and total power generation along with HSE indices are taken into consideration for determining the efficiency of 20 electric power plants or decision-making units (DMUs). Moreover, DMUs are ranked based on their relative efficiency scores. Findings Results show that HSE factors are significant in performance assessment of the power plants studied in this research, and among HSE factors, health has the most powerful impact on the efficiency of the power plants. Originality/value The approach of this study could be used for continuous improvement of combined HSE and conventional factors. It would also help managers to have better comprehension of key shaping factors in terms of HSE.

Power and area-efficient register designs involving EHO algorithm

Circuit World ◽  
2020 ◽  
Vol 46 (2) ◽  
pp. 93-105
Author(s):  
Neethu Anna Sabu ◽  
Batri K.
Keyword(s):  
Low Power ◽  
Building Blocks ◽  
Leakage Power ◽  
Shift Register ◽  
Total Power ◽  
Performance Parameters ◽  
Content Type ◽  
Total Power Consumption ◽  
First Time ◽  
Area Efficient

Purpose This paper aims to design three low-power and area-efficient serial input parallel output (SIPO) register designs, namely, transistor count reduction technique shift register (TCRSR), series stacking in TCR shift register (S-TCRSR) and forced stacking of transistor in TCR shift register (FST in TCRSR). Shift registers (SR) are the basic building blocks of all types of digital applications. The performance of all the designs has been improved through one of the metaheuristic algorithms named elephant herding optimization (EHO) algorithm and hence suited for low-power very large scale integration (VLSI) applications. It is for the first time that the EHO algorithm is implemented in memory elements. Design/methodology/approach The registers together with clock network consume 18-36 percentage of the total power consumption of a microprocessor. The proposed designs are implemented using low-power and high-performance double edge-triggered D flip-flops with least count of clocked transistors involving transmission gate. The second and third register designs are developed from the modified version of the first one employing series and forced stacking, thereby reducing static power because of sub-threshold leakage current. The performance parameters such as power-delay-product (PDP) and leakage power are further optimized using the EHO algorithm. A greater reduction in power is achieved in all the designs by utilizing the EHO algorithm. Findings All the designs are simulated at a supply voltage of 1 V/500 MHz when the input switching activity is 25 percentage in Cadence Virtuoso using 45 nm CMOS technology. Nine recently proposed SR designs are simulated in the same conditions, and the performance has been compared with the proposed ones. The simulated results prove the excellence of proposed designs in different performance parameters like leakage power, energy-delay-product (EDP), PDP, layout area compared with the recent designs. The PDPdq value has a reduction of 95.9per cent (TCRSR), 96.6per cent (S-TCRSR) and 97per cent (FST in TCRSR) with that of a conventional shift register (TGSR). Originality/value The performance of proposed low-power SR designs is enhanced using EHO algorithm. The optimized performance results have been compared with a few optimization algorithms. It is for the first time that EHO algorithm is implemented in memory elements.

scholarly journals BiCMOS Colpitts oscillator for vector-sum interpolators

2016 ◽  
Vol 33 (2) ◽  
pp. 87-93
Author(s):  
Deepa George ◽  
Saurabh Sinha
Keyword(s):  
Phase Shifter ◽  
Phased Array ◽  
Total Power ◽  
60 Ghz ◽  
Colpitts Oscillator ◽  
Content Type ◽  
Simulation Results ◽  
Vector Sum ◽  
5 Ghz ◽  
Oscillator Output

Purpose The demand for higher bandwidth has resulted in the development of mm-wave phased array systems. This paper aims to explore a technique that could be used to feed the individual antennas in a mm-wave phased array system with the appropriate phase shifted signal to achieve the required directivity. It presents differential Colpitts oscillators at 5 and 60 GHz that can provide differential output signals to the quadrature signal generators in the proposed phase shifter system. Design/methodology/approach The phase shifter system comprises a differential Colpitts voltage controlled oscillator (VCO) and utilizes the vector-sum technique to generate the phase shifted signal. The differential VCO is connected in the common-collector configuration for the 5-GHz VCO, and is extended using a cascode transistor for the 60-GHz VCO for better stability at mm-wave. The vector sum is achieved using a variable gain amplifier (VGA) that combines the in-phase and quadrature phase signal, generated from oscillator output using hybrid Lange couplers. The devices were fabricated using IBM 130-nm SiGe BiCMOS process, and simulations were performed with a process design kit provided by the foundry. Findings The measured results of the 5-GHz and 60-GHz VCOs indicate that differential Colpitts VCO could generate oscillator output with good phase noise performance. The simulation results of the phase shifter system indicate that the generation of signals with phases from 0° to 360° in steps of 22.5° was achieved using the proposed approach. A Gilbert mixer topology was used for the VGA and the linearity was improved by a pre-distortion circuit implemented using an inverse tanh cell. Originality/value The measurement results indicate that differential Colpitts oscillator in common-collector configuration could be used to generate differential VCO signals for the vector-sum phase shifter. The simulation results of the proposed phase shifter system at mm-wave show that the phase shift could be realised at a total power consumption of 200 mW.

Computationally efficient permanent magnet traction motor loss assessment

2018 ◽  
Vol 37 (6) ◽  
pp. 2093-2108 ◽  
Author(s):  
Athanasios Sarigiannidis ◽  
Minos Beniakar ◽  
Antonios Kladas
Keyword(s):  
Permanent Magnet ◽  
Computational Cost ◽  
Operating Conditions ◽  
Total Power ◽  
Fe Model ◽  
Evaluation Technique ◽  
Computationally Efficient ◽  
Operating Cycle ◽  
Traction Motor ◽  
Content Type

Purpose This paper aims to introduce a computationally efficient hybrid analytical–finite element (FE) methodology for loss evaluation in electric vehicle (EV) permanent magnet (PM) traction motor applications. In this class of problems, eddy current losses in PMs and iron laminations constitute an important part of overall drive losses, representing a key design target. Design/methodology/approach Both surface mounted permanent magnet (SMPM) and double-layer interior permanent magnet (IPM) motor topologies are considered. The PM eddy losses are calculated by using analytical solutions and Fourier harmonic decomposition. The boundary conditions are based on slot opening magnetic field strength tangential component in the air gap in the SMPM topology case, whereas the numerically evaluated normal flux density variation on the surface of the outer PM is implemented in the IPM case. Combined analytical–loss evaluation technique has been verified by comparing its results to a transient magnetodynamic two-dimensional FE model ones. Findings The proposed loss evaluation technique calculated the total power losses for various operating conditions with low computational cost, illustrating the relative advantages and drawbacks of each motor topology along a typical EV operating cycle. The accuracy of the method was comparable to transient FE loss evaluation models, particularly around nominal speed. Originality/value The originality of this paper is based on the development of a fast and accurate PM eddy loss model for both SMPM and IPM motor topologies for traction applications, combining effectively both analytical and FE techniques.

Global coal market will decline in the long term

2016 ◽  
Keyword(s):  
Power Generation ◽  
Carbon Sources ◽  
Total Power ◽  
Low Carbon ◽  
Export Markets ◽  
Content Type ◽  
Thermal Coal ◽  
Coal Market ◽  
Domestic Power

Subject Outlook for global coal markets. Significance Thermal coal prices hit a record of 210 dollars per tonne in July 2008 and have declined since 2011. Last year, prices averaged 57 dollars per tonne and until recently struggled to hold above the 45 threshold. The slide is due to environmental concerns, which are shifting power generation towards low-carbon sources. After several years of 300 million tonnes (mt) yearly growth, global coal demand fell by 63 mt in 2014 and by 180 mt in 2015. Although many mines have been shut, production fell by less than demand. Impacts This year Russia may surpass its 2015 production by 10 mt, all of which will be exported. Australia's compliance with Paris emissions reduction targets may thwart domestic coal projects mulled by China's Shenhua and India's Adani. Having lost its export markets, Indonesia is redirecting its coal production towards the slated increase in domestic power generation. Colombia has entered the Indian market thanks to record-low freight rates; their increase may reduce flows to the subcontinent. Japan targets a 26% reduction in emissions for 2030 by limiting coal use to 26% of total power output.

scholarly journals Unified model of temperature dependence of core losses in soft magnetic materials exposed to non-sinusoidal flux waveforms and DC bias condition

2015 ◽  
Vol 34 (1) ◽  
pp. 371-379 ◽  
Author(s):  
Adam Ruszczyk ◽  
Krzysztof Sokalski
Keyword(s):  
Magnetic Materials ◽  
Power Density ◽  
Soft Magnetic Materials ◽  
Scaling Theory ◽  
Total Power ◽  
Soft Magnetic ◽  
Content Type ◽  
Core Losses ◽  
Dc Bias ◽  
Bias Condition

Purpose – The purpose of this paper is to present modelling of power losses dependences on temperature in soft magnetic materials exposed to non-sinusoidal flux waveforms and DC bias condition. Design/methodology/approach – Scaling theory allows the power loss density to be derived in the form of a general homogeneous function, which depends on the peak-to-peak of the magnetic inductance ΔB, frequency f, DC bias HDC and temperature T. The form of this function has been generated through the Maclaurin expansion with respect to scaled frequency, which suit very much for the Bertotti decomposition. The parameters of the model consist of expansion coefficients, scaling exponents, parameters of DC bias mapping, parameters of temperature factor and tuning exponents. Values of these model parameters were estimated on the basis of measured data of total power density losses. Findings – The main finding of the paper is a unified methodology for the derivation of a mathematical model which satisfactorily describes the total power density losses versus ΔB, f, HDC, and T in soft magnetic devices. Research limitations/implications – Still the derived method does not describe dependences of the power density loss on shape and size of considered sample. Practical implications – The most important achievement is of the practical use. The paper is useful for device designers. Originality/value – This paper presents the algorithm which enables us to calculate core losses while the temperature is changing. Moreover, this method is effective regardless of soft magnetic material type and the flux waveforms as well as the DC bias condition. The application of scaling theory in the description of energy losses in soft magnetic materials justifies that soft magnetic materials are scaling invariant systems.

scholarly journals Unmitigated Surgical Castration in Calves of Different Ages: Electroencephalographic and Neurohormonal Findings

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1791
Author(s):  
Luciana Bergamasco ◽  
Lily N. Edwards-Callaway ◽  
Nora M. Bello ◽  
Sage Mijares ◽  
Charley A. Cull ◽  
...  
Keyword(s):  
Substance P ◽  
North American ◽  
Mitigation Strategies ◽  
Total Power ◽  
Median Frequency ◽  
Experimental Conditions ◽  
Absolute Power ◽  
Management Procedure ◽  
Different Ages ◽  
Cattle Management

Castration is a common management procedure employed in North American cattle production and is known to cause a pain response. The present study was designed to investigate the effect of unmitigated surgical castration on the electroencephalography (EEG) responses and plasma substance P (SP) concentrations in calves of different ages under the same experimental conditions. Thirty male Holstein calves in three age categories [<6 weeks (6W); 3 months (3M); 6 months (6M); 10 calves per age group] were used in the study. Calves were subjected to a simulated castration session (SHAM) followed 24 h later by surgical castration (CAST) without analgesia. An EEG analysis was performed before the procedure (i.e., baseline), at treatment, and 0–5, 5–10, and 10–20 min post-treatment for both SHAM and CAST, respectively. Blood samples were collected immediately prior to both treatments (time 0) and again at 1, 2, 4, 8, and 12 h after both treatments. The EEG results showed a three-way interaction between treatment, age, and time for delta and beta absolute power, beta relative power, total power, and median frequency (p = 0.004, p = 0.04, p = 0.04, p = 0.03, and p = 0.008, respectively). Following CAST, EEG total power decreased, and median frequency increased relative to SHAM in 6W and 3M calves only following treatment. For 6W and 3M calves, delta and beta absolute power increased at CAST and at later time points relative to SHAM. Marginal evidence for two-way interactions was noted between time and treatment and between age and treatment on the concentration of SP (p = 0.068 and p = 0.066, respectively). Substance P concentrations decreased in CAST treatment compared to SHAM at the later times (8 h: p = 0.007; 12 h: p = 0.048); 6W calves showed lower SP concentration at CAST relative to SHAM (p = 0.017). These findings indicate variation in EEG responses and in SP concentrations following unmitigated surgical castration in calves and that these responses may be age specific. These EEG findings have implications for supporting the perception of the pain associated with surgical castration in young calves and emphasize the urgency of pain mitigation strategies during routine husbandry practices such as castration, as typically implemented in North American cattle management.

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