w parallel resonant half bridge quasi resonant converter

... to PWM switching converters In PWM switching converters, the switch network is replaced by an average circuit model and only low-frequency (DC) components are considered while ignoring switching ... typical switching waveform of a half- bridge inverter which is the input to the LLC resonant tank (θ = Dead Time, d = Duty Cycle) FIGURE 5: OUTPUT VOLTAGE OF HALF- BRIDGE INVERTER The switching waveform ... Technical Support: http://www.microchip.com/ support Web Address: www.microchip.com Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200...

Ngày tải lên: 11/01/2016, 16:57

... http://pubs.acs.org ’ ACKNOWLEDGMENT This research was supported in part by AFOSR Award No FA9550-08-1-0019, ARO Award No W9 11NF-09-1-0240, and NSF Award No CBET-0846725 W. H was supported as part ... (10 nm fwhm) from 400 to 1600 nm Figure shows the photocurrent of anodic TiO2 with and without Au nanoparticles irradiated with ultraviolet (20 mW/ cm2 at 254 nm) and visible light (7 W/ cm2 at ... illumination Figure 5a shows the photocurrent spectra of anodic TiO2 with and without Au nanoparticles Both spectra show an appreciable photocurrent for wavelengths below 500 nm By taking the ratio...

Ngày tải lên: 18/09/2013, 21:25

... actuation waveform is shown in Figure This wave- Comb-resonators as shown in Figure were measured in order to prove that this measurement concept was feasible A total of eight devices were measured ... resonators without external damping were driven with a 45 Vpeak pulse as shown in Figure The resonators were then re-measured in the presence of an external displacement bias The waveform was modified ... total of eight devices were measured The devices were driven with a waveform such as described in Figure The waveform’s amplitude was set to 55 Vpeak with a frequency of 480 Hz The design resonance...

Ngày tải lên: 23/10/2013, 16:15

... actuation waveform is shown in Figure This wave- Comb-resonators as shown in Figure were measured in order to prove that this measurement concept was feasible A total of eight devices were measured ... resonators without external damping were driven with a 45 Vpeak pulse as shown in Figure The resonators were then re-measured in the presence of an external displacement bias The waveform was modified ... total of eight devices were measured The devices were driven with a waveform such as described in Figure The waveform’s amplitude was set to 55 Vpeak with a frequency of 480 Hz The design resonance...

Ngày tải lên: 25/12/2013, 05:17

... are always present, whereupon the thyristors will conduct whenever they become forward biased (anode positive) just as if they were diodes Converter operation for constant id with lc = and without ... slowly relative to the converter switching frequency, (3) the thyristor is an infinite impedance device when reverse biased or when the gating signal to allow current flow has not occurred, (4) when ... Semiconductor Circuits, John Wiley and Sons, New York, 1975 [4] P Wood, Switching Power Converters, Van Nostrand Reinhold Co., New York, 1981 [5] S.D Sudhoff and O Wasynczuk, “Analysis and Average-Value...

Ngày tải lên: 16/02/2014, 18:52

... THREE-PHASE BRIDGE CONVERTER 463 Figure 12.2-3 Phase leg equivalent circuits (a) Upper switch on; ixs > (b) Upper switch on; ixs < (c) Upper switch on; ixs = (d) Lower switch on; ixs > (e) Lower switch ... type of converter is often referred to as an inverter when power flow is from the dc system to the ac system If power flow is from the ac system to the dc system, which is also possible, the converter ... selection of the switching frequency Trading off waveform quality versus the switching frequency, while keeping in mind that the actual switching frequency will be lower than the set switching frequency,...

Ngày tải lên: 16/02/2014, 18:53

... đổi Push – pull converter mostfet phải chịu điện áp ngược lớn gấp 2,6VDC cỡ 1000V đắt tiền khó tìm kiếm thị trường Còn sử dụng biến đổi Half – Bridge converter mosfet mạch full – bridge thay tụ ... dùng tụ điện công suất tải không lớn dùng mosfet nên mạch half – bridge dùng cho dải công suất cỡ 100 0W với mạch 200 0W phải dùng mạch full – bridge hoạt động ổn định 23 CHƯƠNG 3: TÍNH CHỌN CÁC PHẦN ... ngược mà Diode phải chịu là:  Nếu ta chọn mạch half – bridge có tính chất đặc biệt sau: Điện áp cuộn sơ cấp máy biến áp là:  Nếu ta chọn mạch Full – bridge có tính chất đặc biệt sau: Điện áp ngược...

Ngày tải lên: 03/04/2014, 20:20

... however, it allows a finite radius which would result from any practical fabrication method The mode area vs waveguide geometry is shown in Fig 4(b), which shows that a waveguide defined by w ... Figure (Media 1) shows that the incident wave with wave vector k0 couples through the bowtie aperture to the mode propagating in the ±y directions down the waveguide, with wave vectors indicated ... lines with variable widths, i.e., a wider width directly above the bowtie aperture for a higher coupling efficiency, and tapered down to a narrower width at the desired locations Standard microwave...

Ngày tải lên: 06/05/2014, 08:53

... collinear pump-probe scheme Laser pulses with 50 fs FWHM (full width at half maximum) are generated by a Spectra Physics Ti:sapphire system with the center wavelength at 800 nm and a repetition ... umklapp, and phonon resonant scattering, respectively The last term, the phonon resonant scattering, is the resonant interaction between guest atoms and lattice phonons, with the resonant frequency ... modes measured with ultrafast optical experiments are in general different from the Raman modes The two dashed lines in Fig shows the two Ag modes of the Sb4 ring [6], and the arrows are the frequencies...

Ngày tải lên: 06/05/2014, 08:54

... to the much lower filling ratios, which agrees with observations in previous work.13 Also, the n-type samples in the present study may have smaller carrier effective mass, which can weaken the carrier–phonon ... duration (full-width at half- maximum, FWHM) of 70 fs as measured by autocorrelation, and the pump had pulse duration (FWHM) of 140 fs as measured by cross-correlation The fluence of the pump was tuned ... change of the reflectance of the sample surface within several ps was recorded The Raman spectra measurements were taken with the excitation laser at wavelength of 633 nm Considering the possible...

Ngày tải lên: 06/05/2014, 08:54

... collinear pump-probe scheme Laser pulses with 50 fs FWHM (full width at half maximum) are generated by a Spectra Physics Ti:sapphire system with the center wavelength at 800 nm and a repetition ... umklapp, and phonon resonant scattering, respectively The last term, the phonon resonant scattering, is the resonant interaction between guest atoms and lattice phonons, with the resonant frequency ... modes measured with ultrafast optical experiments are in general different from the Raman modes The two dashed lines in Fig shows the two Ag modes of the Sb4 ring [6], and the arrows are the frequencies...

Ngày tải lên: 06/05/2014, 08:58

... to the much lower filling ratios, which agrees with observations in previous work.13 Also, the n-type samples in the present study may have smaller carrier effective mass, which can weaken the carrier–phonon ... duration (full-width at half- maximum, FWHM) of 70 fs as measured by autocorrelation, and the pump had pulse duration (FWHM) of 140 fs as measured by cross-correlation The fluence of the pump was tuned ... change of the reflectance of the sample surface within several ps was recorded The Raman spectra measurements were taken with the excitation laser at wavelength of 633 nm Considering the possible...

Ngày tải lên: 06/05/2014, 08:58

... http://www.wasserauto.de/html/stanley_meyer.html http://www.rexresearch.com/meyerhy/meyerhy.htm - http://www.paulkemble.com/stan3.htm http://www.hydropowercar.com/comment.php?reply.content.18.6 - http://www.777001.com/index.php/Persons:Stan_Meyer ... http://countrycoast.com/waterbuggy.htm http://automorrow.com/articles/meyers.html - http://www.padrak.com/ine/NEN_4_11_1.html http://www.stanleymeyer.com/index.html - http://www.wasserauto.de/html/stanley_meyer.html ... info, visit www.energeticforum.com/renewable-energy or the FREE Members Only section www.energeticforum.com/energy ; I posted schematics and other info there White Dragon Press www.whitedragonpress.com...

Ngày tải lên: 28/05/2014, 14:51

... book series and new book proposals please contact the Publisher, Dr Nigel Hollingworth at nhollingworth@williamandrew.com http://www.williamandrew.com/MNT Fabrication and Design of Resonant Microdevices ... This book is printed on acid-free paper 10 Published by: William Andrew Inc 13 Eaton Avenue Norwich, NY 13815 1-800-932-7045 www.williamandrew.com Environmentally Friendly This book has been printed ... bridge at Tacoma Narrows in November 1940 due to wind is an c 2008 William Andrew Inc Fabrication and Design of Resonant Microdevices Figure 1.1 Amplitude response of a system with multiple resonant...

Ngày tải lên: 04/06/2014, 15:18

... substrate while the second printing temperature is below Tg The higher temperature was used to ensure that the templated surface was fully replicated into the surface of the PC substrate while the lower ... the resonant frequency can be as high as 91 MHz when H = μm and d = μm By contrast, for E = 10 MPa, the resonant frequency can be as low as 23.2 KHz when H = 0.2 μm and d = 50 μm In other words, ... secondary mode resonant frequency is 199 MHz when H = μm, d = μm, and E = 10 GPa, compared with the base mode resonant frequency of 91 MHz As shown in Figure 6b, the secondary mode resonant frequency...

Ngày tải lên: 21/06/2014, 06:20

... QW is created next to the emitter barrier Electrons which occupy the quasi- bound states in the triangular QW form a 2DEG Resonant tunneling can occur between 2DEG states in this triangular well ... magnetic field We have observed one electron resonant peak at V1 = 0.32 V which was associated with the resonant tunneling through the first confined electron state e1 in the QW Under light excitation, ... Therefore, resonant tunneling can also occur between 2DHG states and hole resonant states (hh1, lh1, and etc.) in the QW Under applied bias, photo-created holes can tunnel (resonantly or non-resonantly)...

Ngày tải lên: 21/06/2014, 06:20

... nanosecond pulses in the near resonant regime It is well known that resonant nonlinearity is large but has a slow response with large linear absorption On the other hand, off resonant nonlinearity has ... Klimov, Ch.J Schwarz, D .W Mcbranch, Phys Rev B 60, R2177 (1999) 24 J He, W Ji, G.H Ma, S.H Tang, E.S .W Kong, S.Y Chow, X.H Zhang, Z.L Hua, J.L Shi, J Phys Chem B 109, 4373 (2005) 25 R.E Schwerzel, K.B ... operative The absorption spectrum shows a long wavelength tail absorption which can be due to the defect levels arising from sulphur vacancies which are located below the conduction band in bulk CdS...

Ngày tải lên: 22/06/2014, 18:20

... was shown how the model can be used to analyze the sensitivity to channel matching errors for a parallel system Both Nyquist-rate and oversampled systems have been considered, and it was shown ... such that “full calibration” between the channels is not needed Whereas the new formulation is in fact not constrained to parallel ΣΔ-ADCs but applicable to general parallel systems that use modulation ... et al ACKNOWLEDGEMENT The work is financially supported by the Swedish Research Council REFERENCES [1] L J Breems, R Rutten, and G Wetzker, “A cascaded continuous-time ΣΔ modulator with 67-dB...

Ngày tải lên: 22/06/2014, 19:20

... Arrangement with Stainless Steel Setup 136 4.15 Two Halves Soil Specimens with Filter Paper Apparatus 137 4.16 Schleicher & Schuell No 589-WH Filter Paper in Between Two Larger ... the wave propagation velocity The differential shear stress-elastic strain relationship can be studied by propagating shear waves (S-waves) Wave propagation measurement is a very powerful way ... Typical Resonant Curve with Variables for Half- Power Method 96 3.27 Nyquist Plot Used in the Circle-Fit Method 97 3.28 Triaxial and Bender Element Setup 98 3.29 Arbitrary Waveform...

Ngày tải lên: 14/11/2014, 13:29

... measurement I would also like to thank Professor Wai-Kin Wang for the vacuum setup Throughout my PHD study, I work closely with Jiangzhong Chen We did designs together, shared the know-hows together, ... Comparison of this work with previous capacitive MEMS accelerometer 104 7.3 Comparison of this work with previous silicon resonant accelerometer 104 - vii - Silicon micromachined resonant accelerometer ... electrostatic stiffness [8], both of them work well only for low frequency resonators with natural frequency below hundreds of kHz For MEMS resonators with higher natural frequencies, their mechanical...

Ngày tải lên: 14/09/2015, 14:13