Tài liệu POWER DENSITY ppt

... all directions. The power of a transmitter that is radiated from an isotropic antenna will have a uniform power density (power per unit area) in all directions. The power density at any distance ... dB 4-2.2 Figure 1. Power Density vs. Range Sample Power Density Calculation - Far Field (Refer to Section 3-5 for the definition of near field and far field) Calculate the powe...

Ngày tải lên: 22/01/2014, 11:20

... money. Managing Density in the Data Center: A Long-term Approach for the Future Ample Data Center White Space Managing Density in the Data Center: A Long-term Approach for the Future Page 3 Managing Density ... operations personnel who maintain the network. A managed density approach that takes a long-term view of data center design is key to ensuring maximum density and growth wi...

Ngày tải lên: 10/12/2013, 19:15

... F.G.Turnbull; Power electronic control of AC motors, Oxford: Pergamon Press, 1988. [3] B.K.Bose; Power electronics and AC drives, Englewood Cliffs: Prentice-Hall, 1986. ENGNG3070 Power Electronics ... Nowadays, semiconductor switching frequencies are for major part of the power region in the kHz region. Typically, for small to medium powers, inverter switching frequency is of the orde...

Ngày tải lên: 26/12/2013, 01:17

... PCU output power. When the PCU output power reaches a maximum level, the input resistance is fixed at the value that produces this level. Presumably when output power is a maximum, input power is ... maximum power from the array. This is done by incorporating maximum power- tracking circuitry into the PCU. Figure 18.4 shows the I – V characteristics of an array with the max...

Ngày tải lên: 13/12/2013, 00:15

... displacement power factor yields the total power factor, 0.75 in this case. Thus, the incandescent lamp, a resistive load, appears to the power system as a 0.75 power factor lagging load. Low power ... it is possible to achieve a power factor greater than 0.99 and a THD less Power factor Average power Apparent power 1 T v s t()i s t() 0 T ∫ V rms I rms == Power factor...

Ngày tải lên: 13/12/2013, 00:15

... Basic FullBasic Full Bridge Power ConverterBridge Power Converter Either Q1 & Q3 or Q2 & Q4 are turned ON simultaneously. H. Chan; ... and driving V o to zero. . H. Chan; Mohawk College 52 and driving V o to zero. . Power Supply Block DiagramPower Supply Block Diagram H. Chan; Mohawk College 1 Equations for LH1605 Switching ... Mohawk College 51 Either Q1 & Q3 or Q2 & Q...

Ngày tải lên: 13/12/2013, 23:15

Ngày tải lên: 24/01/2014, 19:20

... high- power voltage source inverters, IEEE Trans. Power Electron., 7, 189, 1992. © 2002 by CRC Press LLC 25. Corzine, K. A., Delisle, D. E., Borraccini, J. P., and Baker, J. R., Multi-level power ... Introduction Multilevel power conversion was first introduced 20 years ago [1]. The general concept involves utilizing a higher number of active semiconductor switches to perform the po...

Ngày tải lên: 25/01/2014, 13:20

... larger power applications, typically above 1.5 kW, it is advisable to use a higher power supply. In some applications, two of the three phases of a three-phase power system are used as the source powering the ... CRC Press LLC 3. AC power systems can be interconnected employing a DC tie without reference to system frequen- cies, short circuit power, etc. 4. High-speed control of DC...

Ngày tải lên: 25/01/2014, 13:20

... three-phase bridge (Fig. 3.3) converters. The cycloconverter is usually used for three-phase, high -power, low-speed synchronous motor drives and rarely employed for induction motor drives. 3.3

Ngày tải lên: 25/01/2014, 13:20