Power conversion control device

The power conversion control device addresses waveform distortion in three-phase rectifiers by using semiconductor circuits and zero-sequence voltage control, achieving high power factor and reduced distortion in AC to DC conversion.

JP7863709B2Active Publication Date: 2026-05-22PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2021-12-02
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing three-phase rectifiers face challenges in reducing distortion of the AC current waveform when using reactors with large inductance, leading to inefficiencies in converting AC power to DC power.

Method used

A power conversion control device that includes semiconductor circuits with reactors, semiconductor switches, and diodes, controlled by a controller to manage the on/off ratio of the switches, ensuring the current waveform matches the voltage waveform by adjusting the polarity and applying zero-sequence voltage to minimize distortion.

Benefits of technology

The device achieves a high power factor and reduces phase current distortion, enabling accurate and efficient conversion of AC power to DC power.

✦ Generated by Eureka AI based on patent content.

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Abstract

A semiconductor switch (204R) is provided so as to conductively connect a DC intermediate potential terminal with a reactor (203R) that is between the semiconductor switch (204R) and each phase output of a three-phase AC power supply (201). A positive side diode (205R) and a negative side diode (206R) are provided so as to conductively connect the reactor (203R) with a DC positive potential terminal and a DC negative potential terminal, thereby supplying power to the DC side. The on / off state of the semiconductor switch (204R) is controlled so that electric current from the three-phase AC power supply has a similar waveform which is in phase with voltage. The same voltage is added to the ideal voltage of each phase unless polarity of the output voltage of the three-phase AC power supply (201) coincides with polarity of a short-time average voltage during the on / off control period at a connection point between the reactor (203R) and the semiconductor switch (204R).
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