Power converter

The power converter reduces switching losses and maintains distortion-free phase voltage by employing two-phase modulation in a three-phase inverter with a single-phase inverter, using IGBT and MOSFET elements to enhance voltage utilization.

JP7864595B2Active Publication Date: 2026-05-25TOYO DENKI SEIZO KK
View PDF 5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYO DENKI SEIZO KK
Filing Date
2022-08-22
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

High-frequency isolation systems in power conversion devices face increased power loss due to the use of switching elements with large current capacity, leading to slower switching speeds and distorted phase voltage waveforms, especially when output voltage is low.

Method used

A power converter design incorporating a three-phase inverter with a single-phase inverter and a control circuit that applies two-phase modulation to reduce switching losses by pausing switching in one phase during each cycle, using IGBT elements for the three-phase inverter and MOSFET elements for the single-phase inverter.

Benefits of technology

The design achieves reduced element losses while maintaining distortion-free phase voltage and improving voltage utilization.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007864595000001
    Figure 0007864595000001
  • Figure 0007864595000002
    Figure 0007864595000002
  • Figure 0007864595000003
    Figure 0007864595000003
Patent Text Reader

Abstract

To provide a power conversion device having small element loss while achieving a high voltage utilization ratio and phase voltage without distortion.SOLUTION: A power conversion device 10 comprises: a three-phase inverter 20 having first to third legs each having first and second switching elements connected in serial between a first terminal and a second terminal to which a DC electric signal is input; a single phase inverter having a fourth leg 21n with first and second switching elements connected between a first terminal and a second terminal in serial; and a control circuit 40 that inputs a control signal to each of the first and second switching elements provided in each of the first to fourth legs to switch conduction of the switching element. The control circuit 40 inputs, to each of the first and second switching elements, a signal generated by comparing first to third modulated signal waves in which the first to third signal waves corresponding to the first to third legs are modulated in two phases with a transfer wave as a control signal.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Power conversion device

    JP2007274825A

  • Controller of three-phase rotary machine

    JP2008104327A

  • Power converter for railway vehicle

    JP2019041544A

  • Utilizing zero-sequence switchings for reversible converters

    US20040004852A1

  • Power conversion device

    WO2020089990A1