Neutral point controller, method of controlling and...

Details Neutral point controller, method of controlling and... Neutral point controller, method of controlling and...

2007-03-27

2007-03-27

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S043000, C363S037000

Reexamination Certificate

active

11089597

ABSTRACT:
The present invention provides a neutral point controller for use with a three level rectifier. In one embodiment, the neutral point controller includes a primary drive circuit configured to provide primary drive signals for the three level rectifier thereby establishing output voltages having a common neutral point. Additionally, the neutral point controller also includes a current balancing compensator coupled to the primary drive circuit and configured to maintain the common neutral point within a predefined voltage by adjusting the primary drive signals based on a current balancing feedback signal. In an alternative embodiment, the neutral point controller further includes a duty cycle compensator coupled to the current balancing compensator and configured to maintain the common neutral point within the predefined voltage by adjusting the primary drive signals based on a direct balancing pulse width modulation signal.

REFERENCES:
patent: 6031738 (2000-02-01), Lipo et al.

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