Power failure hold control method, resonant conversion circuit, and electronic device

By using the output voltage to control and adjust the switching state of the switching circuit in the LLC resonant converter, the resonant energy storage is enhanced, the power-down retention time is extended, the instability problem of the LLC resonant converter during power-down is solved, and the reliability and energy efficiency of the system are improved.

CN122292829APending Publication Date: 2026-06-26WUHAN MEGMEET ELECTRICAL CO LTD +1
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN MEGMEET ELECTRICAL CO LTD
Filing Date
2026-03-05
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing LLC resonant converters have a short hold-up time when power is lost, which leads to system instability and reduced reliability.

Method used

When the output voltage of the transformer rectifier circuit is lower than the set voltage threshold, a second control signal is obtained from the output voltage and sent to the regulating switch circuit to change the switching state, adjust the short circuit state of the primary side of the transformer rectifier circuit, enhance the resonant energy storage of the inverter resonant circuit, and use the resonant energy storage to extend the holding time of the output voltage within the preset threshold range.

Benefits of technology

It achieves longer power-off retention time, improves system stability, reduces energy consumption, optimizes power transmission, and eliminates the need for additional energy storage components, saving costs and space.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122292829A_ABST
    Figure CN122292829A_ABST
Patent Text Reader

Abstract

This application discloses a power-down retention control method, a resonant converter circuit, and an electronic device. The power-down retention control method includes: acquiring the output voltage of a transformer-rectifier circuit; obtaining a first control signal using the output voltage; sending the first control signal to an inverter resonant circuit to trigger the inverter resonant circuit to change its switching state to adjust the output voltage; in response to the output voltage being lower than a set voltage threshold, obtaining a second control signal using the output voltage; and sending the second control signal to an adjustment switch circuit to trigger the adjustment switch circuit to change its switching state, thereby adjusting the short-circuit state on the primary side of the transformer-rectifier circuit to enhance the resonant energy storage of the inverter resonant circuit, and using the resonant energy storage to extend the retention time of the output voltage within the preset threshold range. Through the above methods, the power-down retention control method of this application can achieve a longer power-down retention time, which helps to improve system stability, reduce energy consumption, and optimize power transmission.
Need to check novelty before this filing date? Find Prior Art