Full-bridge LLC resonant converter control circuit

By configuring a frequency conversion and phase shift controller in a full-bridge LLC resonant converter and combining a mode switching module, precise control of the output voltage under different input voltage conditions is achieved, the power density and efficiency of the converter are improved, and the performance of the traditional full-bridge LLC resonant converter is solved in a wide input voltage range.

CN223297503UActive Publication Date: 2025-09-02MAINTENANCE BRANCH OF STATE GRID CHONGQING ELECTRIC POWER
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Patent Information

Application Number
CN202422421964.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-08
Publication Date
2025-09-02
Estimated Expiration
2034-10-08

AI Technical Summary

Technical Problem

Traditional full-bridge LLC resonant converters face the problems of large filter inductance and wide duty cycle variation range under a wide input voltage range, resulting in reduced power density and reduced efficiency.

Method used

Configure the frequency converter and the phase shift controller to switch the control mode through the input voltage detection module. When the input voltage is lower than the threshold, the phase shift control is adopted when the input voltage is lower than the threshold, and when it is higher than the threshold, it is adopted to control the working mode of the switch tube with the switch switching circuit.

Benefits of technology

Under different input voltage conditions, the output voltage is accurately controlled, which improves the power density and efficiency of the converter, and solves the problems of voltage fluctuations and instability.

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Abstract

The utility model provides a full-bridge LLC resonant converter control circuit, which is characterized in that a full-bridge LCC resonant converter is provided with a frequency conversion controller, a phase shift controller and a mode switching module, the input end of the mode switching module is connected with an input voltage detection module, and when the input voltage of the full-bridge LCC resonant converter is lower than a preset threshold value, the phase shift controller is connected with the mode switching module. When the input voltage of the full-bridge LCC resonant converter is larger than or equal to a preset threshold value, the variable frequency controller controls a switching tube in the full-bridge LCC resonant converter to work through switching of the switch, and when the input voltage of the full-bridge LCC resonant converter is larger than or equal to the preset threshold value, the phase shift controller controls the switching tube in the full-bridge LCC resonant converter to work through switching of the switch. The full-bridge LLC resonant converter has the advantages that the variable-frequency controller and the phase-shift controller are arranged in the control circuit at the same time, switching of control modes can be achieved based on judgment of the magnitude of input voltage and through a simple switching circuit, the full-bridge LLC resonant converter has the advantages of variable-frequency control and phase-shift control, and the problems of voltage fluctuation and instability are solved.
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