graph LR
subgraph "PFC升压级"
A["AC输入 \n 85-265VAC"] --> B["EMI滤波器"]
B --> C["整流桥"]
C --> D["PFC升压电感"]
D --> E["PFC开关节点"]
E --> F["VBMB17R11S \n 700V/11A"]
F --> G["高压母线 \n 400VDC"]
H["PFC控制器"] --> I["栅极驱动器"]
I --> F
G -->|电压反馈| H
end
subgraph "LLC谐振变换级"
G --> J["谐振电容Cr"]
J --> K["谐振电感Lr"]
K --> L["励磁电感Lm"]
L --> M["变压器初级"]
M --> N["LLC开关节点"]
N --> O["VBM165R08SE \n 650V/8A"]
O --> P["初级地"]
Q["LLC控制器"] --> R["栅极驱动器"]
R --> O
M -->|辅助绕组反馈| Q
end
subgraph "热管理接口"
S["液冷板/散热器"] --> T["PFC MOSFET"]
S --> U["LLC MOSFET"]
V["温度传感器"] --> W["MCU"]
W --> X["风扇/PWM控制"]
X --> Y["冷却系统"]
end
style F fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style O fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
同步整流与智能负载管理拓扑详图
graph TB
subgraph "同步整流电路"
A["变压器次级"] --> B["同步整流节点"]
B --> C["VBA1402 \n 40V/36A"]
C --> D["输出滤波电感"]
D --> E["输出电容"]
E --> F["直流输出正极"]
B --> G["VBA1402 \n 40V/36A"]
G --> H["输出地"]
I["同步整流控制器"] --> J["栅极驱动器"]
J --> C
J --> G
end
subgraph "智能负载管理通道"
K["MCU GPIO"] --> L["电平转换电路"]
L --> M["VBA1402控制端"]
subgraph N["VBA1402负载开关"]
direction LR
IN["栅极"]
S["源极"]
D["漏极"]
end
VCC_12V["12V辅助电源"] --> D
S --> O["负载设备"]
O --> P["地"]
end
subgraph "散热设计"
Q["PCB厚铜箔 \n 2oz以上"] --> R["同步整流MOSFET"]
S["散热过孔阵列 \n 孔径0.3mm,间距1mm"] --> R
T["底部散热焊盘"] --> R
U["散热冷板"] --> T
end
subgraph "保护电路"
V["RC缓冲电路"] --> C
W["TVS保护"] --> C
X["电流检测电阻"] --> F
X --> Y["比较器"]
Y --> Z["故障保护"]
end
style C fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style N fill:#fff3e0,stroke:#ff9800,stroke-width:2px
热管理与保护电路拓扑详图
graph LR
subgraph "三级热管理系统"
A["一级: 主动散热"] --> B["液冷板/强制风冷"]
B --> C["PFC & LLC MOSFET"]
D["二级: 强化导热"] --> E["PCB导热设计"]
E --> F["同步整流MOSFET"]
G["三级: 自然散热"] --> H["控制芯片与无源元件"]
I["温度监测网络"] --> J["MCU"]
subgraph I["温度监测网络"]
T1["NTC1: PFC MOSFET"]
T2["NTC2: LLC MOSFET"]
T3["NTC3: 同步整流"]
T4["NTC4: 散热器"]
end
J --> K["风扇PWM控制"]
J --> L["泵速控制"]
J --> M["功率降额控制"]
K --> N["冷却风扇"]
L --> O["液冷泵"]
end
subgraph "电气保护网络"
P["输入级保护"] --> Q["MOV浪涌保护"]
P --> R["气体放电管"]
S["开关节点保护"] --> T["RCD缓冲电路"]
S --> U["RC吸收电路"]
V["栅极驱动保护"] --> W["TVS阵列"]
V --> X["有源米勒钳位"]
Y["输出保护"] --> Z["过压保护"]
Y --> AA["过流保护"]
Y --> BB["短路保护"]
Z --> CC["比较器与锁存"]
AA --> CC
BB --> CC
CC --> DD["故障关断信号"]
DD --> C
DD --> F
end
subgraph "故障诊断机制"
EE["电流检测"] --> FF["硬件比较器"]
GG["电压检测"] --> FF
HH["温度检测"] --> FF
II["谐振监测"] --> JJ["LLC故障检测"]
FF --> KK["故障锁存与上报"]
JJ --> KK
KK --> MCU
end
style C fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style F fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
点击下载：VBA1402规格书
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