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

... 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

... 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