Cross-connected series-parallel LLC converter and system

By using a cross-connected series-parallel LLC converter topology and state machine control, the efficiency and control problems of LLC converters under bidirectional power flow are solved, achieving efficient power conversion and stable power regulation, and simplifying the control complexity of ISOP systems.

CN224459669UActive Publication Date: 2026-07-03AEROSPACE CHANGFENG CHAOYANG POWER SUPPLY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
AEROSPACE CHANGFENG CHAOYANG POWER SUPPLY
Filing Date
2025-08-12
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional LLC converters suffer from problems such as increased stress on switching transistors, DC bias of resonant capacitor voltage, reduced power conversion efficiency, and lag in control response under bidirectional power flow conditions, and ISOP topology has high complexity.

Method used

A cross-connected series-parallel LLC converter topology is adopted. Through the cross connection of Class A and Class B LLC converters, efficient power conversion under forward and reverse power transmission is achieved. A state machine control strategy is used for smooth switching, simplifying the control logic between modules.

Benefits of technology

It improves bidirectional power regulation capability and energy transmission efficiency, simplifies voltage and current equalization control between modules, and enhances system stability and reliability.

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Abstract

This utility model discloses a cross-connected series-parallel LLC converter and the system thereof. The converter includes a Class A LLC converter and a Class B LLC converter. The resonant side of the Class A LLC converter is connected in series with the non-resonant side of the Class B LLC converter, serving as the series side port. The non-resonant side of the Class A LLC converter is connected in parallel with the resonant side of the Class B LLC converter, serving as the parallel side port. The system includes N cross-connected series-parallel LLC converter modules, where N≥2. The series sides of each module are connected in series to form the system series side, receiving or providing the total voltage and current Is of the system series side. The parallel sides of each module are connected in parallel to form the system parallel side, receiving or providing the system parallel side voltage Vp and the total current of the system parallel side. The beneficial effects of this utility model are: improved bidirectional power regulation capability and energy transmission efficiency, simplified voltage and current sharing control between ISOP system modules, and stable switching of multiple operating modes and smooth power commutation.
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