一种具备二次电压纹波抑制功能的AC / DC变换电路及方法
By adding a VRM unit and employing voltage closed-loop control to the LLC-DCX converter, the problem of the LLC-DCX converter being unable to eliminate the secondary ripple of the preceding PFC converter was solved, thereby improving the waveform quality and power density on the output side.
CN117728698BActive Publication Date: 2026-07-17NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
- Filing Date
- 2023-11-07
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
The LLC-DCX converter cannot effectively eliminate the secondary ripple effect caused by the preceding PFC converter, resulting in poor waveform quality on the DC load side.
Method used
A VRM unit is added to the subsequent DC/DC converter. Through voltage closed-loop or voltage-current dual-loop control, a secondary voltage ripple active suppression strategy is adopted. The auxiliary transformer and synchronous rectification module are used to cancel the double frequency ripple pulsation on the bus capacitor.
Benefits of technology
It effectively suppresses and eliminates secondary ripple, ensuring output waveform quality and improving dynamic response and power density.
✦ Generated by Eureka AI based on patent content.
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Figure CN117728698B_ABST
Abstract
本发明涉及电能变换装置技术领域，公开一种具备二次电压纹波抑制功能的AC / DC变换电路，包括：前级PFC变换器和后级DC / DC变换器，后级DC / DC变换器包括LLC‑DCX变换器和VRM单元；在功率传递过程中，LLC‑DCX变换器用于传递大部分功率，VRM单元用于改变占空比来调节前级PFC变换器带来的二次纹波和母线电压波动。在拓扑结构上，本发明充分应用了LLC‑DCX变换器高效率高功率密度的特性，针对LLC‑DCX变换器无电压调节能力的缺点，添加VRM单元，确保在输出侧抑制和消除二次纹波，保证输出侧波形质量。
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