Voltage drive system with hysteretic current control and...

Electric power conversion systems – Current conversion – Using semiconductor-type converter

Reexamination Certificate

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C363S095000, C363S097000, C363S098000, C363S131000, C363S016000, C363S017000

Reexamination Certificate

active

07894224

ABSTRACT:
A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator receives a phase current error and has an adder which generates a modulated phase current error based on the phase current error and based on a signal having a phase. For each respective modulator, the phase of the respective signal is different. Each respective modulator changes a respective gate input when the respective modulated phase current error changes from being within a predetermined current range to being outside of the predetermined current range. Each respective switching circuit receives the respective gate input and generates a respective output terminal voltage based on the respective gate input. The change in the respective gate input effectively causes a switching event of the respective switching circuit.

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“Operation and Design of Multilevel Inverters”, Corzine, University of Missouri, Rolla, Developed for the Office of Naval Research Dec. 2003, revised Jun. 2005.

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