TOSHIBA G9000 UPS White Paper
© 2008 TOSHIBA INTERNATIONAL CORPORATION – INDUSTRIAL DIVISION
Page 2
/toshiba02/User2/UPSMKT/GENERAL/UPS/3 Phase Systems/White Papers/G9000 White Paper - multi-level converter.doc
UPSG9000WP081201
Multilevel Power Converters for Higher Efficiency and
Size Effective UPS Systems
A double conversion UPS typically has three power conversion stages
(converter, inverter and chopper) as shown in Figure 1. Each power
converter is basically an array of semiconductors (switches). These
switches are arranged in such way that their commutation enables the
synthesis of the required output voltage waveform.
Conventional inverters have a configuration as shown in Figure 2. In this
configuration, note that,
n
the voltage stress on each power switch can be as high as the DC link
voltage E.
n
the output voltage at each terminal varies between two levels: +E/2
Volts and –E/2 Volts. Thus, the voltage variation (
dv/dt
) at the terminal
is equal to E Volts.
FIGURE 1
Single line
diagram of a double
conversion UPS
FIGURE 2
A conventional
2-level 3-phase
inverte r circuit
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