cúk and sepic dc dc converters

... is not inverted The voltage ratio is defined as: VDCout = −u (1 − u ) VDCin Where VDCin is the supply voltage, VDCout is the output voltage and u is the duty cycle ratio The state-space equation ... the wind speed and Cp is turbine power coefficient which depends on the tip speed ratio (2) and θ is the pitch angle The power coefficient is different for every particular turbine and a convenient ... this work) As the foreseen power converter configuration consists of passive diode rectifier and of DC- DC converter, the speed control is achieved by the noninverting buck-boost converter The reference...

Ngày tải lên: 03/01/2014, 19:15

... resistor id （2-15） ud E R ud O α θ δ ωt id E Id ωt O a) b)  With resistor and inductor When L is large enough, the output voltage and current waveforms are the same as ordinary inductive load When L ... O iC iR ud+ C R ia ωt b) O ωt VD4VD6VD2 a) c) 2.5 Harmonics and power factor of rectifier circuits 2.5.1 Basic concepts of harmonics and reactive power For pure sinusoidal waveform For periodic ... uac ωt Ud = 2π 5π +α π +α ∫ 2U sin ωtd (ωt ) = U cos α = 1.17U cosα （2-18） 2π Thyristor voltage and currents, transformer current : I = I VT = I d = 0.577 I d （2-23） U FM = U RM = 2.45U （2-25）...

Ngày tải lên: 14/05/2014, 21:59

... topologies used in dc to dc converters There are now available new integrated circuit pulse-width-modulating chips (1’WM) that simplify the dc to dc converter design These new PWM chips and the ease ... FREQUENCY DC- DC CONVERTERS a @ ii Other Books and Software by the Author BQQks Mo~netic Core Selection for Trnnsfortners mui lnchctors Marcel Dekker, 270 Madison Ave., New York, NY 10016 Transformer and ... beginning of the book and continuing through to the end, will gain a comprehensive knowledge in transformer and inductor design for different topologies used in dc to dc converters No responsibility...

Ngày tải lên: 06/08/2014, 10:20

... The interaction of HIV-1 with DC- SIGN can lead to either infection of DCs or internalization of the virus and subsequent transfer [18,19] The interaction of HIV-1 and DC- SIGN is mainly dependent ... with Raji -DC- SIGN cells A) DC- SIGN dependent transfer of viruses cultured long-term in the presence or absence of CQ (days 14, 77 and 197) B) DC- SIGN dependent transfer of JR-CSF, 299.10 and LAI ... 332, 386, 392, 397 and 448 [23] It is known that the binding sites on gp120 that interact with 2G12 and DC- SIGN are overlapping and encompass PNG events Binding of cellular DC- SIGN can be reduced...

Ngày tải lên: 13/08/2014, 09:20

Ngày tải lên: 06/06/2016, 17:54

... currents andifluxes due to the permanent magnets of the rotor : where L, and M, are the self-inductance and the mutualinductance of the stator coils Since we assume a constant airgap and no saturation, ... d torque and the i current component estimations, the calculation of the linear control outputs (vI and v2) and the nonlinear feedback total compensation A powem microprocessor-basedcontrol system ... difWentes str&gies de aommande", ThPse de Dmtorat de U.N.P.G.,Juin 1989 H Bolton, R Ashen, "Influence of Motor Design and FeedCument Waveform on Torque m l e in Brushless DC Drives ", in IEE Proceedings,...

Ngày tải lên: 03/01/2014, 19:44

... from the measured stator voltages Vsα and Vsβ and currents i sα and isβ , then by using (1) and (4) qand d-axis flux linkage are drived Also, by usig (4) qand d-axis current are calculated Finally, ... respectively Implementations of torque, q– and d–axis rotor reference frame stator currents and three-phase currents and Back-EMFs responses of the proposed DTC of a BLDC motor drive scheme are demonstrated ... obtained and the estimated torque tracks the reference torque closely The high frequency ripples observed in the torque and current can be minimized by properly selecting the dc- link voltage and torque...

Ngày tải lên: 03/01/2014, 19:45

... of the torque and flux hysteresis bands are 0.001 N·m and 0.001 Wb, respectively The dc- link voltage Vdc equals 355 √ 40 V Appendix I shows the specifications and parameters of the BLDC motor In ... = Lq ds = Ldq s and Lq ds are the mutual inductances between d- and q-axis Ldsf and Lq sf are the mutual inductances between dq-axes and permanent magnet (PM), respectively, and if is the equivalent ... [Tα β ] ⎣ Xb ⎦= [Tα β ]+ [TL L ] Xca Xc OZTURK AND TOLIYAT: DIRECT TORQUE AND INDIRECT FLUX CONTROL OF BRUSHLESS DC MOTOR 353 After (3) is expanded and multiplied by the original × Park transformation...

Ngày tải lên: 03/01/2014, 19:46

... in figure To control i rd n o and sepa arately the co oupling elem ments b and d are decoupled b the matrix Fdc and AIdc so that d by xes and de epend only on a and c After removin A ng the coupling ... controllable dc link volta as indica in the ri age ated ight hand sub b diagram d Figure capacitor v voltage of the output filt with unbalanced load and controlled DC lin ter d o nk vo oltage Figure DC ... was discus r ssed in [4], [6 and [8] an 6] nd for three pha inverters in [1], [2], [3], [5] and [7], the dead beat contro in [1] and [2] is adopte ase s d ol ed and extended to mach fo three...

Ngày tải lên: 19/01/2014, 02:20

... 10.6 SOLID-STATE CONVERTERS FOR DC DRIVE SYSTEMS Numerous types of ac /dc and dc/ dc converters are used in variable-speed drive systems to supply an adjustable dc voltage to the dc drive machine ... ONE-QUADRANT DC/ DC CONVERTER DRIVE + DC supply ia va – (a) DC supply + ia va – (b) ia DC supply va + – (c) Figure 10.6-3 Typical dc/ dc converters (a) One quadrant; (b) two quadrant; and (c) four ... interval A, S1 and S2 are closed and S3 and S4 are open The second state occurs over interval B, wherein the S3 and S4 are closed and S1 and S2 are open As in the case of the previous dc/ dc converters, ...

Ngày tải lên: 16/02/2014, 18:48

... DC- SIGN, Mana13Man-PA for DC- SIGNR and NGA2-Fmoc for LSECtin (Fig S2) As shown in Fig 1, the Bt and appKd values were 1.72 nmol and 49.4 lm for DC- SIGN, 4.25 nmol and 136.4 lm for DC- SIGNR, and ... binding feature to DC- SIGN (i.e Man- and Fuc-specificity) [4,23] DC- SIGNR binds to and takes up exogenous ligands, including viruses (e.g HIV and Ebola) and parasites (e.g Schistosoma), and mediates ... expressing DC- SIGN, DC- SIGNR and LSECtin to Lec8 cells (A) CHO cells stably expressing DC- SIGN, DC- SIGNR and LSECtin were prepared as described in the Materials and methods Surface expression of the DC- SIGN-related...

Ngày tải lên: 15/03/2014, 23:20

... materials The effect of dc bias voltage on the IG/ID ratio and the FWHM are presented in Figure The line shapes of the G- and D-bands and the quality indexes vary significantly with dc bias voltage The ... however, the D-band was fitted with a single Lorentzian The three components at 1573, 1599, and 1625 cm-1 correspond to the E2g, E1g, and A1g modes, respectively;28,29 these modes and the D-band are considered ... quality of the fit in the low-energy and high-energy tails of the D- and G-bands, respectively, is good The assignment of the peak components of the D- and G-bands is consistent with the works 19730...

Ngày tải lên: 06/05/2014, 08:53

... Statements of Transactions (Standard Form 224) or Statements of Accountability/Transactions (Standard Forms 1218/1219 and 1220/1221) to report agency collection and disbursement activity along ... Form 2108 and related transactions reported on Standard Form 224 are used to prepare the Treasury’s Fiscal Year 1997 Annual Report and should agree with the corresponding balances and transactions ... must timely research and resolve any differences between their records and what Treasury has reported on Statement of Differences (FMS Form 6652) and Undisbursed Appropriation and Receipt Account...

Ngày tải lên: 20/06/2014, 06:20

... Service, and General Government, House Committee on Ways and Means, House Committee on Government Reform and Oversight, House Subcommittee on Government Management, Information and Technology, and ... explain agencies’ roles and responsibilities in the overall reconciliation process, and does not contain step-by-step guidance that some agencies say they need to effectively and efficiently reconcile ... promote efficient and effective reconciliations Agency Comments Treasury agreed with our findings and recommendations Treasury stated its intention to implement corrective actions and appropriately...

Ngày tải lên: 20/06/2014, 06:20

... indicators was investigated and it was suggested that it induces a decline in vascular plant -diversity, i.e species richness and species evenness [27] and a decline in the biomass and diversity of macroarthropods ... representation of VI/SI and sites Beyond these two constraints, sampling was randomly conducted within the 94 AI previously studied Male and female cones were individualized, and were also divided ... diversity, land use and climate change in the central Scandes Mountains of Norway, Global Ecol Biogeogr Lett (1997) 419429 [14] Jay-Robert P., Lobo J.M., Lumaret J.P., Altitudinal turnover and species...

Ngày tải lên: 08/08/2014, 14:21

... storage DC nano-grid concept 41 Selection of power interface for energy storage 46 2.3.1 Bidirectional DC- DC converters 46 2.3.2 Bidirectional DC- AC converters ... and help of lab officers: Mr i Woo Ying Chee and Mr Chandra from Electrical Machines and Drives Laboratory, and Mr Seow Hung Cheng from Energy Management and Micro-grid Lab I also would like to express ... equivalent circuit of DC- DC converter and (b) Its application for subsystem division 193 6.4 DC power system with multi sources, multi loads 194 6.5 Diagram of DC power system with...

Ngày tải lên: 09/09/2015, 09:59

... waveform The DC flux density BDC (t) and the DC magnetizing field intensity HDC (t) are given by BDC (t) = HDC (t) = NIL (t) Ac R NIL (t) lm (2.10) (2.11) The AC flux density ∆B(t) and the AC magnetizing ... loss BDC HDC H ∆H HDC: DC magnetizing force ∆H : AC magnetizing force BDC: DC flux density ∆B : AC flux density Figure 2.4: B-H hysteresis loop Substituting (2.7) into (2.6), we have B(t) = BDC ... whereas other DCM control schemes require multiple clock cycles There is a smooth transition between CCM and DCM operations of the boost converter in each AC half cycle and between heavy and light...

Ngày tải lên: 09/09/2015, 17:53

... transient DC link voltage, vdc (in DC coupling), DC link split capacitor voltage, vdcp , with grid power command, (b) zoomed DC link voltage, vdc (in DC coupling), DC link split capacitor voltage, vdcp ... iCa , DC link split capacitor current, in , phase-c current of CCVSI, iCc , (d) DC link voltage, vdc and upper DC link split capacitor voltage, vpdc , with grid power command, Pg = −200W and Qg ... current, iCa , DC link lower capacitor current, in , phase-c CCVSI current, iCc , (f) DC link voltage, Vdc , DC link upper split capacitor voltage, Vdcp at grid power command, Pg = W and Qg = V ar...

Ngày tải lên: 09/09/2015, 18:56

... inductance vaL1 idc ,∆idc DC signal and AC signal in DC link current ip ,ip ,in ,in d q d q DC signals in positive and negative d-q frame currents vdc ,∆vdc DC signal and AC signal in DC link voltage ... fundamental frequency voltage across the inductance vdc DC link voltage ∗ vdc reference value of DC link voltage Vrh ,φvh amplitude and phase of the hth -order DC voltage harmonics VCES IGBT maximum collector-emitter ... in positive and negative α-β frame I0 DC signal of DC link current Ia1 ,δi amplitude and phase of fundamental line side current ia1 p p n n Id0 ,Iq0 ,Id0 ,Iq0 DC signals in positive and negative...

Ngày tải lên: 11/09/2015, 16:02

... via the basic power converters, such as the DC- DC, AC -DC, DC- AC converters The main focus of this thesis is the analysis and design of a soft switching bi-directional DC- DC converter, including ... bi-directional DC- DC converter operating with PWM and phase-shift control, shown in Fig 2.7 The combination of PWM and phase-shift control helps to expand the ZVS range, and reduce the current 23 stress and ... back-to-back bi-directional DC- DC converter is proposed, and an FPGA based digital control design for it is developed The bi-directional DC- DC converter is able to handle the power ow in both...

Ngày tải lên: 12/09/2015, 08:20