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
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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.
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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
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