Capacitor charge balancing technique for a three-level PWM...

Details Capacitor charge balancing technique for a three-level PWM... Capacitor charge balancing technique for a three-level PWM...

2005-01-11

2005-01-11

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S132000

Reexamination Certificate

active

06842354

ABSTRACT:
A power converter includes a DC to AC inverter that is connected to a neutral node formed between first and second capacitors connected across two DC supply lines. The inverter is operated to selectively couple the DC supply lines and the neutral node to an output terminal thereby producing an alternating voltage waveform formed by a sequence of output pulses having positive, zero and negative voltage levels. To compensate for a voltage imbalance across the capacitors, an imbalance compensation coefficient is derived from the difference in voltages across the first and second capacitors and from the direction of current between the neutral node and the inverter. The imbalance compensation coefficient is employed to adjust the width of the output pulses so as to charge and discharge the capacitors to correct the imbalance.

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“A Novel Approach to the Generation and Optimization of Three-Level PWM Waveforms,” PESC '88 Proceedings, pp. 1255-1262.

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