Patent ID: 7872373

Claim:
A device for supplying uninterruptible power, said device comprising: input connections for connection to a primary DC voltage supply device; standby-power connections for connecting a standby power source; first-output connections for connecting a load; a device for decoupling the input connections from the first-output connections in the event of a fault in the primary DC voltage supply device; a first controllable switching device for connecting the standby power source to the first-output connections in a controlled manner in the event of a fault in the primary DC voltage supply device; and a control and monitoring device having a control part that is assigned to the first controllable switching device; characterized in that the device for decoupling comprises a diode that has i) an anode connection that is directly electrically connected to one of the input connections and ii) a cathode connection that is directly electrically connected to one of the first-output connections, the first controllable switching device has a first power transistor having a gate, a drain and a source terminal, the control and monitoring device i) also has a monitoring part that is provided for monitoring the output current flowing through the first power transistor, and ii) is directly electrically connected to the source terminal of the first power transistor, and the control part is directly electrically connected to the gate terminal of the first power transistor and is designed to pulse-width-modulate the first power transistor on the basis of the current being monitored in order to limit the current which can be provided by the standby power source.