POWER CONVERTER
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United States of America Patent
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Jun 21, 2017
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Jul 13, 2016
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Abstract
A power converter includes a neutral point clamped inverter circuit including a first capacitor and a second capacitor that are connected in series to divide an input direct-current voltage by half. When receiving an instruction to start a single-phase three-wire output control process and finding that a voltage difference between a voltage across the first capacitor and a voltage across the second capacitor exceeds a predetermined threshold, the controller performs a capacitor voltage balancing process for reducing the voltage difference before starting the single-phase three-wire output control process.
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