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US 4,048,553 AGranted
Interruption-free power supply
AssigneeSiemens Aktiengesellschaft
InventorGunter Schierer
Life of this patent
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Abstract
An interruption-free power supply is disclosed comprising a line-commutated, controlled rectifier whose input is adapted to be connected to a supply voltage and whose output is connected to the network to be protected via a filter means. In order to prevent overvoltages at the inverter output from disturbing the network being protected, the inverter output is connected to a controlled rectifier which is controlled by a control unit to connect the inverter output to a battery during an overvoltage condition.
Claims6
An interruption-free power supply for connecting a supply network to a network to be protected comprising:
- a line-commutated, controlled rectifier having an input adapted to be connected to said supply network and an output which is adapted to be connected to a battery;
- a self commutating controlled inverter connected to the output of said line-commutated, controlled rectifier, said inverter including filter means adapted to be connected to said network to be protected;
- an externally commutated rectifier having a first end connected to the output of said controlled inverter and a second end adapted to be connected to said battery;
- means for sensing the output voltage of said inverter;
- and means responsive to said sensed output voltage for controlling said externally commutated rectifier so as to enable said externally commutated rectifier to carry increased current when a voltage dependent on said sensed output voltage exceeds a predetermined limit.
2 more elements
Dependencies are inferred from the claim text.