Patent attributes
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 (11a, 12a, 13a) 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.
