Rectifier bridge apparatus
AssigneeTelefonaktiebolaget LM Ericsson
InventorsKjell Rundkvist, Eric Groth
Life of this patent
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Abstract
In a rectifier bridge, a method and system for starting a DC-driven device without the occurrence of a current surge. The input of the rectifier bridge is connected to a three-phase source and a storage capacitor is connected across the output of the rectifier bridge. At least two of the three input terminals of the rectifier bridge are each connected in series to a respective AC capacitor. Each of the capacitors is connected in parallel with a respective controlled switch which functions to short-circuit the capcitors subsequent to the storage capacitor being charged.
Claims26
A rectifier bridge for starting a DC-driven device without current surges, the system comprising:
- an output of said rectifier bridge;
- a storage capacitor connected across said output;
- an input of said rectifier bridge, said input comprising three terminals for connection to a three-phase source;
- and
- at least two terminals of said input connected in series to respective AC capacitors, said AC capacitors connected in parallel to a controlled switch for short-circuiting said AC capacitors subsequent to said storage capacitor being charged.
A method of using a rectifier bridge for starting a DC-driven device without current surges wherein said rectifier bridge comprises an input with three terminals and an output, the method comprising the steps of:
- connecting a storage capacitor across said output;
- connecting a three-phase source to said three terminals;
- connecting at least two terminals of said input in series to respective AC capacitors;
- connecting said AC capacitors in parallel to a controlled switch;
- and
- short-circuiting said AC capacitors subsequent to said storage capacitor being charged.
A rectifier bridge for starting a DC-driven device the system comprising:
- an output of said rectifier bridge;
- a storage capacitor connected across said output;
- an input of said rectifier bridge, said input comprising three terminals for connection to a three-phase source;
- and
- at least two terminals of said input connected in series to respective means for limiting current upon startup of said DC-driven device, said means for limiting current connected in parallel to a controlled switch for short-circuiting said means for limiting current subsequent to said storage capacitor being charged;
- wherein said means for limiting current generates substantially no heat.
A rectifier bridge for starting a DC-driven device the system comprising:
- an output of said rectifier bridge;
- a storage capacitor connected across said output;
- an input of said rectifier bridge, said input comprising three terminals for connection to a three-phase source;
- and
- at least two terminals of said input connected in series to respective means for capacitively limiting current upon startup of said DC-driven device, said means for capacitively limiting current connected in parallel to a controlled switch for shortcircuiting said means for capacitively limiting current subsequent to said storage capacitor being charged.
Dependencies are inferred from the claim text.