pc not turning on power supply
Single phase uninterruptible power supply based on z source inverter
Ngày tải lên :
03/01/2014, 19:12
... operation, the rectifier provides power
0278-0046/$25.00 â 2008 IEEE
3002 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 55, NO. 8, AUGUST 2008
Fig. 9. Simulation results. (a) Traditional UPS ... transfer
function is
W
ou
(s)=W
u
(s)W
ci
(s)
1
sC
s
(20)
where W
u
(s) is the transfer function of the outer loop
controller.
The proportional–integral (PI) controller is adopted to con-
trol the ... high
efficiency, low harmonics, fast response, and good steady-state
performance in comparison with traditional UPSs. The simulation
and experimental results of a 3-kW UPS with the new topology
confirm its validity.
Index...
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Your PC, Inside and Out: Chassis, Power supply and Motherboard
Ngày tải lên :
19/03/2014, 20:35
... PCIE connectors can also be powered using
2 molex connectors if one isn’t available from
the PSU itself, and molex to SATA power
connectors are also quite common.
SATA - This connector ... take only
Modular Power Supplies
Modular power supplies, on the other hand,
have detachable power connectors. This has
the added benefit that you can have exactly
the connectors you need, and nothing ... the more efficient the power
supply is the less AC power it requires to
provide sufficient DC power, meaning lower
overall power consumption from the mains
and a smaller power bill. The earth...
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Power Supply Units Guide.
Ngày tải lên :
01/11/2012, 16:38
... công suất trực tuyến để tìm
ra con số cần thiết ví dụ như:
- http://www.jscustompcs.com /power_ supply/
- http://www.mymp3car.com/MP3Car/PSUpower.asp
Trong thực thế, Khi đem một hệ
thống ... công suất khoảng 430w
vào bộ nguồn có chỉ số Continuous Power
là 400w, chúng vẫn có thể hoạt động
được trong khoảng thời gian ngắn nếu
mức Peak Power của nguồn đạt trên
430w nhưng sau một ... Pentium III hoặc Athlon XP).
- WTX: jack chính 24 chân, dùng cho Pentium II, III Xeon và Athlon MP.
- ATX 12V: jack chính 20 chân, dây phụ 4 chân 12v (Pentium 4 hoặc Athlon 64)
- EPS12v: jack...
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UPS (Uninterruptible Power Supply)
Ngày tải lên :
27/04/2013, 11:36
... Cách Test đơn giãn là dùng một điện trở tải (điện trở sứ trong các monitor
CRT hay tivi) chừng vài chục ôm và vài chục W. Kẹp song song với que đo
đồng hồ khi đo.
- Nếu mức sụt áp <= 5% là ...
vhoạt động v cung cp ngun cho ti.
ã ON LINE: Inverter luụn hoạt động (on) cung cấp điện
cho tải.
UPS thông minh
ã c iu khin bi phn mm qua cng USB hoc
cng song song.
ã Cho phộp chn oỏn UPS Cho ... như “Wake on Modem”, “Wake on
LAN”. Đó cũng là lý do bạn không nên làm việc với thùng máy khi chưa rút
điện lưới AC cung cấp cho PSU. Dòng điện này còn cấp cho các khe cắm
card PCI, do đó...
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Electronics - Digital Control of Switching Power Supply
Ngày tải lên :
27/10/2013, 16:15
... D/A converters or power control devices. The A/D Converter of ST52x420 is an 8-bit analog to
digital converter with up to 8 analog inputs offering 8-bit resolution and a typical conversion time ... system parameters.
Digital Control of Switching Power Supply
- Power Factor Correction Stage
Sangsun Kim and Dr. P. Enjeti
Power Electronics and Power Quality Laboratory
Department ... additional PFC boost converter in the system is
A conventional SMPS employs a diode rectifier for ac to dc conversion. This type of utility
interface generates harmonics and the input power...
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Tài liệu Power Supply Block Diagram ppt
Ngày tải lên :
13/12/2013, 23:15
... R
s
constant. Since the voltage drop across R
s
is
constant V stays constant
H. Chan; Mohawk College
11
constant, V
o
stays constant.
Comparison of Different Types of RectifiersComparison of ... dropout, higher in/output,
and better regulation are available.
Equations for Buck RegulatorEquations for Buck Regulator
ttV
T
t
tt
t
V
V
on
offon
on
i
o
=
+
=
Sl i I 04I hISelecting I
L
= 0.4I
o
where ... flow through C and D.
Basic PushBasic Push Pull Power ConverterPull Power Converter
Operates as a class D power amplifier. Output rectifier converts
the sq are a e to dc Each transistor m st...
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Tài liệu The Computer Case and Power Supply pptx
Ngày tải lên :
21/12/2013, 19:15
... Power Supply
Estimated time: 45 Minutes
Objective
In this lab, identify the type of computer case to be used, the form factor of the unit, and
the voltage selector switch on the power supply. ...
_______________
USB
Keyboard
Connector
_______
5-pin DIN or
________
6-pin mini DIN
_______
USB (Make sure it matches the connector on the Motherboard).
Power Supply
AT
__________
ATX ...
ISA
_____________
PCI
_____________
On Board
______________
Sound Card
Manufacturer:
__________
Model:
_______________
ISA
____________
PCI
____________
On Board
_____________
...
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asg 2 electrical power supply
Ngày tải lên :
15/02/2014, 08:33
... Electrical power supply architecture
2.4 Power supply functions
2. Electrical power
supply
6
2.4 Power supply functions
There are three separate functions:
b Supply and cut off the machine power ... Electrical power
supply
7
b Power unit supply
The table (C Fig. 5) summarises the power units and functions covering
the requisite functions.
2.5 Power supply to the control circuit
The power supply ... Electrical power
supply
3
1
2
3
4
5
6
7
8
9
10
11
12
M
2.1 Introduction Page
2.2 Power supply to machinery Page
2.3 Standards and conventions Page
2.4 Power supply functions Page
2.5 Power supply...
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Tài liệu Báo cáo khoa học: The antibacterial and antifungal properties of trappin-2 (pre-elafin) do not depend on its protease inhibitory function pptx
Ngày tải lên :
18/02/2014, 17:20
... surviving CFU
Trappin-2/activated conidia
Trappin-2 A62D/M63L/activated conidia
Trappin-2/nonactivated conidia
Trappin-2 A62D/M63L /nonactivated conidia
Elafin/activated conidia
Fig. 4. Antifungal activity ... whereas
dormant conidia were not killed (Fig. 4). The maxi-
mum fungicidal effect was approximately 60% with
the protein concentrations tested and was reached at a
15 lm concentration of trappin-2.
Figure ... added in
the incubation mixture (10
)7
M final) to evaluate their effect on
fibronectin degradation by A. fumigatus protease(s). Fibronectin
breakdown products were separated on a 10% SDS ⁄ PAGE...
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Báo cáo "Application of power electronic components to control parameters and switching of compensation devices on power networks " doc
Ngày tải lên :
05/03/2014, 14:20
... because of consuming a lot of reactive power. Therefore, not only the compensation devices
should be installed on the primary side but also on the the secondary side.
Commonly, compensation level ... valves.
3. Conclusion
The application of power electronic components for controlling in the above mentioned cases
brings certain benefits. Comparing with the manual switching method or contactors ... The controlling of compensation devices could be implemented by power
electronics structures controlling the firing angle of thyristor.
In the next section, we introduce a power electronic...
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Báo cáo khoa học: Heterologous synthesis of cytochrome c¢ by Escherichia coli is not dependent on the System I cytochrome c biogenesis machinery ppt
Ngày tải lên :
06/03/2014, 00:20
... corresponding to the
sequence of the 45th to 53rd residues. The resulting PCR
products were then used as the second PCR templates with a
gene-specific nested reverse primer, PHcp04rv, correspond-
ing ... b
562
from Escherichia coli at
1.4 A
˚
resolution. J Mol Biol 247, 947–962.
4 Weber PC, Salemme FR, Mathews FS & Bethge PH
(1981) On the evolutionary relationship of the 4-a-heli-
cal heme proteins. ... Page MD, Sambongi Y & Ferguson SJ (1998) Contrast-
ing routes of c-type cytochrome assembly in mitochon-
dria, chloroplast and bacteria. Trends Biochem Sci 23,
103–108.
6 Sambongi Y, Uchiyama...
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AN UPDATE ON POWER QUALITY pptx
Ngày tải lên :
17/03/2014, 02:20
... capable of controlling reactive power
to zero value at point of common connection (PCC).The mode of operation is referred as
unity power factor.
2.7. Location of wind turbine
The way of connecting ... and malfunction in communication system. The degree of variation is assessed
at the point of common connection, where consumer and supplier area of responsibility
meet. The harmonics voltage ... induction generator is directly connected to grid. Harmonic measurements are
required only for variable speed turbines equipped with electronic power converters. In
general the power converters...
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AN UPDATE ON POWER QUALITY doc
Ngày tải lên :
23/03/2014, 15:20
...
Harmonics Generation, Propagation and Purging Techniques in Non-Linear Loads
11
the measurement of harmonics should be made on Point of Common Coupling (PCC) or at
the point where non-linear ... and malfunction in communication system. The degree of variation is assessed
at the point of common connection, where consumer and supplier area of responsibility
meet. The harmonics voltage ... induction generator is directly connected to grid. Harmonic measurements are
required only for variable speed turbines equipped with electronic power converters. In
general the power converters...
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Báo cáo khoa học: "Last but Definitely not Least: On the Role of the Last Sentence in Automatic Polarity-Classification" pdf
Ngày tải lên :
23/03/2014, 16:20
... customer-
reviews on the Internet, one should concentrate
computational efforts on messages in the final
position of the text.
1 Introduction
The ever-growing field of polarity-classification
of written ... be located on a nearby position.
From the user interaction point of view, the
mouse movement to that location would have
been either considerably shorter or longer (de-
pending on its distance ... polarity-classification.
Therefore, we first
briefly review the well-established structure of
text units while comparing notions of topic-
extraction vs. our notion of polarity-
classification. We then...
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