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Coordination of Leakage Inductance and Distributed Capacitance in High - Frequency Transformer Primary Windings
Created on 06.03
I. Generation Mechanisms and Impacts of Leakage Inductance and Stray Capacitance
Leakage Inductance
- Generation Mechanism
- Impacts
- Voltage Spikes
- Reduced Efficiency
- EMI Issues
Stray Capacitance
- Generation Mechanism
- Impacts
- Resonant Frequency Shift
- Reduced Efficiency
- EMI Issues
II. Methods for Coordinating Leakage Inductance and Stray Capacitance
Structural Design Optimization
- Reducing Leakage Inductance
- Tight Coupling
- Reducing Turn Count
- Reducing Stray Capacitance
- Increasing Interlayer Insulation
- Reducing Interturn Capacitance
- Increasing Distance from Shielding Layer
Material Selection
- Magnetic Core Material
- Insulating Material
Circuit Design Optimization
- Resonant Compensation
- Damping Network
Simulation and Experimental Verification
- Use electromagnetic simulation software (e.g., ANSYS Maxwell, PSIM) to simulate the impacts of leakage inductance and stray capacitance and optimize design parameters.
- Verify the design effects through experimental testing and adjust the winding structure or materials accordingly.
III. Design Example: High-Frequency DC-DC Transformer
Target Parameters:
- Leakage inductance: ≤1% of the main inductance
- Stray capacitance: ≤50 pF
Design Steps:
- Winding Structure
- Insulating Material
- Magnetic Core Selection
- Simulation Verification
IV. Summary
Balancing Leakage Inductance and Stray Capacitance:
Through structural design optimization, material selection, and circuit optimization, achieve coordination between leakage inductance and stray capacitance to ensure efficient and stable operation of the transformer at high frequencies.
Key Points:
- Leakage inductance should be controlled within a reasonable range to avoid voltage spikes and reduced efficiency.
- Stray capacitance should be minimized to avoid resonant interference and energy loss.
Design Recommendations:
- Prioritize reducing leakage inductance and stray capacitance through winding structure and material optimization, then compensate and dampen through circuit design.
By adopting the above methods, the performance of high-frequency transformers can be significantly improved, meeting the design requirements for high frequency, high efficiency, and low EMI.
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