Resonant converter output overload and short circuit protection system and method without output current detection

Through the resonant converter output overload and short-circuit protection system without output current detection, the resonant current peak detection and dual closed-loop control, combined with ramp compensation control, the efficient overload and short-circuit protection of the LLC resonant converter is achieved, which improves control performance and reduces hardware costs.

CN120433596APending Publication Date: 2025-08-05YANSHAN UNIV +1
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Patent Information

Application Number
CN202510686444.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-27
Publication Date
2025-08-05

AI Technical Summary

Technical Problem

Existing LLC resonant converters are prone to damage switch tubes and diodes in overload and short-circuit states, and existing protection methods require complex hardware or high-cost digital processors, making it difficult to achieve effective overload and short-circuit protection without adding detection circuits.

Method used

The resonant converter output overload and short-circuit protection system is adopted without output current detection. The peak current control and protection function is realized through the resonant current peak detection circuit and dual closed-loop control, combined with the ramp compensation control method, and fully digital control is realized using the microcontroller software algorithm and built-in analog peripherals.

Benefits of technology

Without adding detection circuits, overload and short-circuit protection of the resonant converter is achieved, control performance and dynamic response are improved, hardware costs are reduced, and soft start function is realized through ramp compensation.

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Abstract

The invention discloses a resonant converter output overload and short circuit protection system and method without output current detection, and belongs to the technical field of power electronic converters. When a resonance tank current peak detection signal is equal to a ramp signal to trigger a comparator to output a high-level pulse, the edge triggers the microcontroller to interrupt, and the register value of the current ramp signal is captured immediately after interruption, so that a resonance current peak can be obtained. After an output overload and short circuit fault mark based on the value and the output voltage is triggered, the switching frequency is adjusted through the slope parameter self-adaptive controller to achieve output overload protection, and when the output overload is serious or short circuit occurs, rapid wave sealing protection can be achieved through a software code and a hardware comparator. And meanwhile, the soft start function of the resonant converter can be realized by gradually decreasing the initial value of the set slope descent rate cycle by cycle during starting. The control performance of the resonant converter is improved under the control of the peak current, and the output overload and short circuit protection function can be realized without adding an output current detection circuit.
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