研究目的
To analyze common mode noise in a high step-up converter with GaN devices, identify noise sources through equivalent modeling, and experimentally validate the effects of switching frequency, operation modes, and voltage transition times on conducted emissions.
研究成果
The equivalent noise model effectively identifies noise sources in the high step-up converter, showing that the central winding does not impact emissions from switches. Experimental results confirm that noise emissions increase with higher switching frequencies, vary with operation modes, and are influenced by voltage transition times. GaN devices enable high-frequency operation but exacerbate EMI issues. Recommendations include careful layout design to minimize parasitics and future studies on impedance balancing and voltage collapse mitigation.
研究不足
The study is limited to conducted emissions analysis; radiated emissions are not addressed. The prototype uses specific GaN devices and parameters, which may not generalize to other components or topologies. Parasitic capacitances in the layout could be minimized but not eliminated, affecting results. Future work is needed for impedance balancing and detailed analysis of voltage collapse phenomena.
1：Experimental Design and Method Selection:
The study involves designing a GaN-based prototype of an interleaved high step-up boost converter with a coupled inductor to analyze conducted electromagnetic interference (EMI) emissions. Equivalent noise models are developed to identify noise sources, and superposition principles are used for analysis.
2：Sample Selection and Data Sources:
A practical prototype is built with specific parameters (e.g., input voltage 20-50 VDC, output voltage 100 VDC, switching frequency 100-500 kHz). Conducted emissions are measured using a line impedance stabilization network (LISN) and spectrum analyzer.
3：List of Experimental Equipment and Materials:
Equipment includes a double-layer printed circuit board, GaN FETs (TPH3206), ferrite core inductors (PC40 material), LISN (50Ω/50μH), DC power source, and spectrum analyzer. Materials include components for the converter topology (inductors, diodes, capacitors).
4：Experimental Procedures and Operational Workflow:
The prototype is operated at different switching frequencies (100 kHz, 300 kHz, 500 kHz), duty ratios (30%, 50%, 70% covering various operation modes), and turn-on times (
5：2 ns, 14 ns). Emissions are recorded across the frequency range 15 MHz to 30 MHz. Data Analysis Methods:
Data from the spectrum analyzer is analyzed to compare noise levels under different conditions, using dBμV measurements to assess compliance with CISPR standards.
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