| 摘要 |
A power supply arrangement ( 1 ) has a first input for connecting to a first power source, at least one second input for connecting to at least one second power source and an output for connecting to a load. The arrangement ( 1 ) comprises at least two paralleled inverter modules ( 11, 12, 13 ) supplied by said at least one second input and a static switch ( 30 ) for switching a connection from said first power source to said load. Each of said inverter modules ( 11, 12, 13 ) comprises an internal switch ( 11 a , 12 a , 13 a) for switching a connection from the respective inverter module ( 11, 12, 13 ) to said load. This architecture allows for directly connecting the critical load to the inverter group ( 10 ), thereby eliminating the susceptibility for single point failures at a common static switch for all inverter modules. Redundancy of the whole system may be easily established or increased by providing additional inverter modules. The proposed architecture guarantees a fail safe maintenance procedure as there is no manual bypass needed for maintenance of the static switch.
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