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Spectral Entropy Analysis and Source-Level EMI Suppression in Inverters via Sequential Switching of Series-Connected
1The College of Information Science and Engineering, Northeastern University, Shenyang 110819, China.
Entropy (Basel, Switzerland)
|June 26, 2026
Summary
This study introduces a novel strategy for reducing electromagnetic interference (EMI) in high-voltage inverters. By shaping voltage waveforms, it lowers spectral entropy and switching losses, enhancing electromagnetic compatibility.
Area of Science:
- Power Electronics
- Information Theory
- Electromagnetic Compatibility
Background:
- High-voltage inverters generate wideband electromagnetic interference (EMI) due to switching noise.
- Existing EMI suppression methods often require complex active gate profiling or extensive filtering.
Purpose of the Study:
- To propose a source-level EMI suppression strategy for high-voltage inverters.
- To reduce spectral entropy and switching losses concurrently.
- To establish a novel framework linking power electronics and information theory for EMC.
Main Methods:
- Utilizing a series-connected Insulated Gate Bipolar Transistor (IGBT) topology.
- Implementing discrete staircase voltage shaping.
- Employing a Complex Programmable Logic Device (CPLD)-based sequential gate drive circuit.
Main Results:
- Achieved harmonic attenuation of 4-16 dB μV within a 2 MHz band.
- Reduced active-region switching losses by 68.7%.
- Transformed chaotic switching noise into a deterministic harmonic structure, lowering spectral entropy.
Conclusions:
- The proposed strategy effectively suppresses EMI at the source.
- This method offers a practical, low-complexity solution for high-voltage inverters.
- Demonstrates a novel application of information theory principles to electromagnetic compatibility.
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