Voltage source inverter and medium voltage pre-charge...

Details Voltage source inverter and medium voltage pre-charge... Voltage source inverter and medium voltage pre-charge...

2011-06-21

2011-06-21

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S035000, C323S248000

Reexamination Certificate

active

07965529

ABSTRACT:
A medium voltage adjustable frequency drive includes an input isolation transformer having a three-phase input and a three-phase output, a converter having a three-phase input electrically connected to the three-phase output of the input isolation transformer and an output providing a direct current bus, an inverter having an input electrically connected to the output of the converter and a three-phase output, and a pre-charge circuit. The pre-charge circuit includes a ferro-resonant transformer circuit having a primary winding structured to input a low voltage and a secondary winding structured to output a medium voltage and provide a constant current source. The pre-charge circuit also includes a medium voltage diode bridge having an input receiving the medium voltage from the secondary winding of the ferro-resonant transformer circuit and an output structured to provide the constant current source to the direct current bus.

REFERENCES:
patent: 3914685 (1975-10-01), Van Gilder
patent: 4001665 (1977-01-01), Wisner et al.
patent: 4030025 (1977-06-01), Kakalec
patent: 5416687 (1995-05-01), Beasley
patent: 5747942 (1998-05-01), Ranganath
patent: 6603216 (2003-08-01), Costello
patent: 2003/0067284 (2003-04-01), Costello

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