A soft-switching flyback converter based on coupled inductor LC resonance

CN122137243APending Publication Date: 2026-06-02TIANCHANG FUAN ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANCHANG FUAN ELECTRONICS CO LTD
Filing Date
2026-02-26
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing soft-switching flyback converters suffer from high switching losses, severe electromagnetic interference, low efficiency under light loads, and ineffective recovery of transformer leakage inductance energy.

Method used

The soft-switching flyback converter employs coupled inductor LC resonance. By connecting the parasitic leakage inductance of the transformer primary winding in parallel with an independently set resonant inductor, a parallel relationship is formed, which participates in the LC resonance process. Combined with a digital control module, the duty cycle and switching frequency are dynamically adjusted to achieve zero-voltage switching and leakage inductance energy recovery.

Benefits of technology

Significantly reduces switching losses and electromagnetic interference, improves light-load efficiency, reduces converter size and weight, and meets the needs of high power density and high-precision applications.

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Abstract

This application relates to the field of switching power supply technology, and in particular to a soft-switching flyback converter based on coupled inductor LC resonance, comprising a DC power supply, a high-frequency transformer, main and auxiliary power switches, an LC resonant network, and a digital control module. By connecting an independent resonant inductor in parallel with the primary side of the transformer, the leakage inductance and the resonant inductance participate in LC resonance together, recovering leakage inductance energy; the auxiliary switch controls the resonant branch, achieving zero-voltage switching before the main power switch is turned on; the digital control module dynamically adjusts the operating frequency and duty cycle according to the load, improving light-load efficiency. This invention effectively reduces switching losses and electromagnetic interference, eliminates the need for an RCD clamping circuit, and improves power density and overall efficiency.
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