Modulation method and circuit of LLC conversion circuit, and electronic equipment

By generating and blocking the wave drive control signal to adjust the switching state of the resonant converter circuit, the output ripple problem of the resonant converter under light load or no load conditions is solved, and stability and high dynamic performance under light load are achieved.

CN120979188APending Publication Date: 2025-11-18HUNAN MEGMEET ELECTRICAL TECH CO LTD
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Patent Information

Application Number
CN202510950884.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing resonant converters have large output ripple under light load or no-load conditions, and the control algorithm fails under light load, resulting in unstable output voltage.

Method used

By acquiring the power supply output of the resonant converter circuit, an output control signal is generated using the error signal between the power supply output and the target reference signal. When the output control signal is less than the second comparison threshold of negative correlation, the drive control signal is blocked until the output control signal is greater than the first comparison threshold. The switching state of the resonant converter circuit is adjusted to suppress the output ripple.

Benefits of technology

Under light load or no load conditions, the adaptive control strategy suppresses output ripple, reduces the resource consumption of the digital controller, and maintains high dynamic performance and stability across the entire load range.

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Abstract

The invention discloses a modulation method and circuit of an LLC conversion circuit, and electronic equipment, and is applied to charge modulation of a resonant conversion circuit, and the modulation method comprises the steps: obtaining the power supply output of the resonant conversion circuit; obtaining an output control signal by using an error signal between the power supply output and a target reference signal; generating a drive control signal using the output control signal; detecting whether the output control signal is in a dynamic threshold interval; wherein the second comparison threshold value of the lower limit value of the dynamic threshold value interval is in negative correlation with the output control signal; in response to the fact that the output control signal is smaller than the second comparison threshold value, carrying out wave sealing on the driving control signal until the output control signal is larger than the first comparison threshold value; and the driving control signal is sent to the resonant conversion circuit to adjust the power supply output. Through the mode, the modulation method of the LLC conversion circuit can realize full-load adaptive control through the dynamic hysteresis threshold value and a natural wave stopping mechanism, and the requirement of stability in a full-load range is effectively met.
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