phase bridge half controlled rectifier

... converter bridge, and idc designates the dc current flowing into the bridge The bridge is divided into three legs, one for each phase of the load The line-to-ground voltage of the a-, b-, and c -phase ... drop vd If the upper switch is on and the phase current is zero, it seems Figure 12.2-2 One phase leg THE THREE -PHASE BRIDGE CONVERTER 463 Figure 12.2-3 Phase leg equivalent circuits (a) Upper ... analogous expressions for vbs and vcs Consider a three -phase bridge supplying a wye-connected load in which the a -phase, b -phase, and c -phase resistances are 2, 4, and Ω, respectively Given that...

Ngày tải lên: 16/02/2014, 18:53

... Kharagpur 10.2 Single phase fully controlled halfwave rectifier 10.2.1 Resistive load Fig.10 1(a) shows the circuit diagram of a single phase fully controlled halfwave rectifier supplying a purely ... of the converter A single phase half wave controlled converter always operates in the conduction mode The voltage form factor of a single phase fully controlled half wave converter with a ... Version EE IIT, Kharagpur 10.3 Single phase fully controlled bridge converter Fig 10.3 (a) shows the circuit diagram of a single phase fully controlled bridge converter It is one of the most...

Ngày tải lên: 14/05/2014, 22:32

... circuit, load circuit and experimental results of three -phase dual controlled rectifier Keyword: Synchronous control, firing pulse, dual rectifier I MỞ ĐẦU 1.1 Tổng quan tình hình nghiên cứu thuộc ... switching frequency The application of dual rectifiers will help to overcome the disadvantage as mentioned above In addition, the dual controlled rectifier with common control method allows to ... control method allows to work in two mode including rectification and inversion For three -phase dual controlled rectifiers, the direction conversion is implemented by switching thyristor's firing pulse...

Ngày tải lên: 18/03/2016, 05:21

Ngày tải lên: 13/12/2013, 11:15

... M rectifier is 387 i,, PWM signals SI,, S, and S , for phase U, phase v and phase w , respectively, are generated as follows: are obtained, which are given by To produce these currents , the rectifier ... the three -phase voltage-type P W M rectifier having the function of an active power filterhas been investigated and its effectiveness has been confirmed using a thee -phase diode bridge rectifier ... signal forphase v which is given by (11) can also be obtained in the same manner as that explained above for phase U EXPERIMENTAL INVESTIGATION To confirm the operation of the three -phase PWM rectifier...

Ngày tải lên: 03/01/2014, 19:44

Ngày tải lên: 16/11/2015, 00:30

... SCR (thyristor – silicon controlled rectifier) Nếu ta mắc nguồn điện chiều VAA vào SCR hình sau dòng điện nhỏ IG kích vào cực ... cổng G để SCR dẫn điện phải có dòng điện kích IG vào cực cổng 2/8 SCR (thyristor – silicon controlled rectifier) Ta thấy SCR coi tương đương với hai transistor PNP NPN liên kết qua ngõ thu Khi ... nghịch (điện anod âm điện catod), có dòng điện rỉ nhỏ chạy qua SCR 3/8 SCR (thyristor – silicon controlled rectifier) - Khi SCR phân cực thuận (điện anod dương điện catod), ta nối tắt (hoặc để hở)...

Ngày tải lên: 31/12/2015, 17:08

... SEMI -CONTROLLED BRIDGE CONVERTERS Id wg l c p + Vd0 cos a + - Vd – Figure 11.2-6 Average-value equivalent circuit for a single -phase full -bridge converter Figure 11.2-7 Single -phase, full -bridge ... di3 dt (11.2-6) Figure 11.2-3 Single -phase, full -bridge converter operation for constant output current with lc and without firing delay 438 SEMI -CONTROLLED BRIDGE CONVERTERS where i3 is the current ... From (11.2-13) 2E [cos α − cos(α + γ )] ω g lc (11.2-15) 440 SEMI -CONTROLLED BRIDGE CONVERTERS Figure 11.2-4 Single -phase, full -bridge converter operation for constant output current without lc...

Ngày tải lên: 16/02/2014, 18:52

... Single phase uncontrolled full bridge rectifier Version EE IIT, Kharagpur 21 The split supply full wave single phase rectifier offers as good performance as possible from a single phase rectifier ... - θ) ⎥ = 0.8564 Amps ⎦ 2π ⎣ RMS Diode current = 9.4 Single phase uncontrolled full wave rectifier Single phase uncontrolled half wave rectifiers suffer from poor output voltage and/or input current ... Lesson Single Phase Uncontrolled Rectifier Version EE IIT, Kharagpur Operation and Analysis of single phase uncontrolled rectifiers Instructional Objectives On completion...

Ngày tải lên: 14/05/2014, 22:33

... well-tolerated for patients with moderate to severe psoriasis [16-19] In a 16-week, Phase III, randomized, double-blind, placebo -controlled trial, adalimumab improved HRQOL outcomes in patients with psoriasis, ... analysis came from the Randomized Controlled EValuation of Adalimumab Every Other Week Dosing in Moderate to Severe Psoriasis TriAL (REVEAL) study, a 52-week, Phase III clinical trial in adult ... Corporation and completed this analysis on behalf of Abbott Laboratories NHH: Ms Harnan is an employee of United BioSource Corporation and completed this analysis on behalf of Abbott Laboratories MKW: Dr...

Ngày tải lên: 18/06/2014, 19:20

... a half- line, Journal of Functional Analysis 235 (2006), no 1, 330–354 [9] N T Huy and N V Minh, Exponential dichotomy of difference equations and applications to evolution equations on the half- line, ... on the differences between the exponential dichotomy of the differential equations defined on the half- line and on the whole line) Therefore, one needs new ideas and new techniques to handle the ... exponential dichotomy of difference equations defined only on N For differential equations defined on the half- line, such ideas and techniques have appeared in [14] (see also [8, 13]) Those ideas and techniques...

Ngày tải lên: 22/06/2014, 22:20

... immunopotentiator for therapeutic vaccines Methods Study design and subject selection This single blind controlled phase I study was conducted at the Aster-Cephac S.A facility in Paris Ethical Review http://www.jibtherapies.com/content/5/1/5 ... evaluation of IMP321, a GMP-grade sLAG-3 (hLAG-3Ig) protein, in a large randomised single blind phase I clinical trial The results of this proof-of-concept clinical study in healthy volunteers ... degradation or of a depot effect from the alum The same result has also been obtained in a previous phase I trial testing 10 and 30 μg IMP321 and a flu vaccine (manuscript submitted) Compared to alum,...

Ngày tải lên: 11/08/2014, 10:23

... provided the basis for human clinical trials In a randomized, double-blind, multicenter, and controlled phase II clinical trial involving 236 patients with severe active RA, a decrease in the number ... groups of RA patients with oral CCII or MTX in a randomized, doubleblind, multicenter, and controlled phase III clinical trial Rheumatoid arthritis (RA) is a chronic inflammatory disease characterized ... after giving their written informed consent [20] There are no patients in the phase II study who were enrolled in this phase III trial Table defines the study population Admission criteria also...

Ngày tải lên: 12/08/2014, 11:22

... (page number not for citation purposes) Study design A prospective, placebo -controlled, randomized, double blind, phase II study was conducted in seven centres in France The protocol was approved ... size and statistical analysis This phase II study arbitrarily planned to include 60 patients (30 in each group) in order to assess the opportunity of a larger phase III trial Making the hypothesis ... Saint-Germain en Laye, France on 15 March 2001 Patients were excluded if they were pregnant, if they had endphase chronic disease, if they had a medical staff decision of limitation of care, if they had preliminary...

Ngày tải lên: 13/08/2014, 03:21

... of a three -phase boost-type PWM rectifier ………………… Fig.2.1 Structure of a three phase ac to dc PWM rectifier ……………………….19 Fig.2.2 Schematic diagram for indirect current control or phase and amplitude ... servo drives, the ac to dc uncontrolled diode rectifier or the line-commutated thyristor rectifier, has been used at the front end to provide an uncontrolled or controlled dc output voltage However, ... Fig.5.15 Experiment results for a -phase current and a -phase voltage under unbalanced condition………………………………………….…… …156 Fig.5.16 Experiment results for b -phase current and b -phase voltage under unbalanced...

Ngày tải lên: 11/09/2015, 16:04

... their strategic plan for bridge engineering The detailed plan follows Grand Challenges: Strategic Plan for Bridge Engineering GRAND CHALLENGES: A STRATEGIC PLAN FOR BRIDGE ENGINEERING GRAND CHALLENGE ... Challenges: Strategic Plan for Bridge Engineering GRAND CHALLENGE 3: ACCELERATING BRIDGE CONSTRUCTION To understand the time-restraints, durability and economy of traditional bridge systems and their ... and economical bridges; both the construction of new bridges and highway structures, and the rehabilitation of existing ones Practical Importance A quarter of our nation’s 590,000 bridges are currently...

Ngày tải lên: 06/09/2012, 14:24

... explain this ANTICIPATED EFFECT ON BRIDGES: Changes to the resistance factors could make foundation designs more or less conservative, which could affect the overall bridge design However, the changes ... displacement that should be used will depend on the structure geometry, for example, column height, bridge seat width, etc., as a “one size fits all” approach does not work Furthermore, movement criteria ... Duncan, J M., Rojiani, K B., Ooi, P S K., Tan, C K and Kim S G (1991) Manuals for the Design of Bridge Foundations NCHRP Report 343, TRB, National Research Council, Washington, DC Hannigan, P.J.,...

Ngày tải lên: 06/09/2012, 15:56

... thấp hơn) việc xét chu kỳ lũ 100 năm không kinh tế Lũ thiết kế để tính xói cầu (design flood for bridge scour) lũ chu kỳ 100 năm, đợc dùng để thiết kế cho trờng hợp tải trọng trừ trờng hợp trạng ... cầu phải giả thiết tình trạng xói tơng ứng với dòng lũ xảy Lũ kiểm tra xói cầu (check flood for bridge scour) lũ chu kỳ 500 năm, đợc dùng để kiểm tra ổn định móng trụ cầu trạng thái giới hạn đặc...

Ngày tải lên: 07/09/2012, 09:53

... Existing bridge Cantilever bridge Composite beam bridge Cable-stayed bridge Approach viaduct Movable bridge Sliding bridge Railway bridge, rail bridge Masonry bridge Double deck bridge Frame bridge ... member Bridge Slab bridge Two-equal spans continuos slab bridge Renforced concrete bridge Hoist bridge Bridge design for one traffic lane Bridge design for two or more traffic lanes Deck bridge ... Portal bridge Rigid frame with hinges Bridge composed of simple span precast prestressed grider made continues prefabriques Aqueduct Lifting bridge Skew bridge Long span bridge Short span bridge...

Ngày tải lên: 07/09/2012, 11:12

... which was documented in the trial registration (ISRCTN67636203) This prospective non-randomized controlled cluster trial assessed the cost-effectiveness of three stroke service experiments between ... are assumed to take place at the end of each cycle of six months In our life time perspective a half cycle correction is unnecessary as the effects hardly influence the life-time results All parameters ... However, most are physically or mentally not able to (self-) report quality of life in the acute phase after stroke Therefore, no EuroQoL-5 D scores were available from the EDISSE study at baseline...

Ngày tải lên: 25/10/2012, 10:35