TOSHIBA G9000 UPS White Paper
© 2008 TOSHIBA INTERNATIONAL CORPORATION – INDUSTRIAL DIVISION
Page 8
/toshiba02/User2/UPSMKT/GENERAL/UPS/3 Phase Systems/White Papers/G9000 White Paper - multi-level converter.doc
UPSG9000WP081201
an interesting improvement toward high efficiency. Basically, switching
losses are a function of the voltage across the semiconductor, switching
frequency, switch current, and the junction temperature. For a given
switching frequency, current level and temperature, three-level converters
show a dramatic reduction of switching losses due to the reduced voltage
stress on each power switch and better characteristics of using an IGBT
with lower voltage ratings.
Considering both types of losses in an UPS, the three-level concept
realizes an overall improvement of power conversion efficiency. Figure 10
shows a typical scenario of power loss distribution in an UPS system for
both circuit topologies. Despite of the fact that conduction losses almost
doubles, switching losses are dramatically reduced in a three-level
double-conversion topology. This loss reduction is translated into a higher
efficiency UPS with lower thermal stresses on power semiconductors.
Due to the dramatic
reduction of switching
losses, a three-level
UPS exhibits over
15% of reduction in
power semiconductor
losses.
FIGURE 10
Typical
semiconductor
losses distribution
in an UPS system.
Numbers for
3-level are
referred to
2-level topology.
Содержание T90S3S08KS6XSN
Страница 21: ......
Страница 23: ......
Страница 25: ......
Страница 27: ......
Страница 29: ...G9000 Installation and Operation Manual ...
Страница 31: ...G9000 Installation and Operation Manual ...
Страница 98: ...G9000 Installation and Operation Manual 61 APPENDIX A Installation Planning Guides IPG ...
Страница 99: ...62 G9000 Installation and Operation Manual ...
Страница 100: ...G9000 Installation and Operation Manual 63 ...
Страница 101: ...64 G9000 Installation and Operation Manual ...
Страница 102: ......
Страница 104: ......
Страница 105: ......
Страница 106: ......
Страница 107: ......
Страница 108: ......
Страница 109: ......
Страница 110: ......
Страница 111: ......
Страница 112: ......
Страница 113: ......
Страница 114: ......
Страница 115: ......
Страница 116: ......
Страница 117: ......
Страница 118: ......
Страница 119: ......
Страница 120: ......
Страница 121: ......
Страница 122: ......
Страница 123: ......
Страница 124: ......
Страница 125: ......
Страница 126: ......
Страница 127: ......
Страница 128: ......
Страница 129: ......
Страница 130: ......
Страница 131: ......