Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1996-06-06
1997-04-15
Krishnan, Aditya
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 89, H02M 5453
Patent
active
056216289
ABSTRACT:
A power converter including, a converter, a three-level DC voltage source composed of a series connected capacitors connected between outputs of the converter to generate a positive, a neutral and a negative potential, a three-level NPC inverter, a chopper circuit, and a chopper control circuit. The chopper circuit includes a series circuit of a first and a second switching device connected between a positive and a negative potential points of the three-level DC voltage source, a first and a second diode connected in antiparallel with the first and second switching devices, respectively, and a reactor connected between a neutral potential point and a connecting point of the first and second switching devices. The chopper control circuit includes a first and a second voltage detector for detecting a first and a second voltages between the capacitors, respectively, a voltage controller for comparing the first and second voltages and for generating a voltage control output signal so that a voltage difference becomes zero, and a control circuit for driving the first and second switching devices based on the voltage control output signal. Whereby the fluctuation of the neutral potential of the three-level DC power source is suppressed.
REFERENCES:
patent: 5367448 (1994-11-01), Carroll
patent: 5414613 (1995-05-01), Chen
patent: 5446641 (1995-08-01), Reynolds et al.
patent: 5514915 (1996-05-01), Kim et al.
Miyazaki Satoshi
Yuki Kazuaki
Kabushiki Kaisha Toshiba
Krishnan Aditya
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