graph LR
subgraph "输入与整流级"
A["90-264VAC输入"] --> B["π型EMI滤波器"]
B --> C["整流桥"]
C --> D["高压电解电容 \n 400VDC"]
end
subgraph "反激功率级"
D --> E["变压器初级绕组"]
E --> F["开关节点"]
F --> G["VBR165R01 \n Drain"]
G --> H["Source \n 初级地"]
I["初级PWM控制器"] --> J["栅极驱动器"]
J --> K["VBR165R01 \n Gate"]
end
subgraph "保护与缓冲"
L["RCD钳位电路"] --> F
L --> D
M["电流检测电阻"] --> H
M --> I
N["电压反馈 \n 光耦隔离"] --> I
end
subgraph "变压器设计"
O["初级绕组 \n 高压侧"] --> P["磁芯 \n PC40/PC44"]
P --> Q["次级绕组 \n 低压侧"]
R["屏蔽层 \n 降低EMI"]
end
style G fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
次级侧同步整流与负载管理拓扑详图
graph TB
subgraph "同步整流级"
A["变压器次级"] --> B["整流节点"]
B --> C["VBGQF1302 \n Drain"]
C --> D["Source \n 输出正极"]
E["同步整流控制器"] --> F["栅极驱动器"]
F --> G["VBGQF1302 \n Gate"]
end
subgraph "输出滤波"
D --> H["滤波电感"]
H --> I["输出电容 \n 低ESR"]
I --> J["5V直流输出"]
end
subgraph "智能负载管理"
J --> K["负载开关节点"]
subgraph "VBB2355开关"
L["VBB2355 \n Drain"]
M["VBB2355 \n Gate"]
N["VBB2355 \n Source"]
end
K --> L
M --> O["MCU/协议芯片"]
N --> P["Type-C接口 \n VBUS"]
Q["过流检测"] --> R["比较器"]
R --> O
O --> S["故障指示"]
end
subgraph "协议识别"
T["Type-C CC引脚"] --> U["协议芯片"]
U --> O
V["电压反馈"] --> W["误差放大器"]
W --> X["光耦 \n 隔离反馈"]
end
style C fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style L fill:#fff3e0,stroke:#ff9800,stroke-width:2px
热管理与可靠性拓扑详图
graph LR
subgraph "两级热管理架构"
A["一级散热:同步整流管"] --> B["PCB大面积敷铜 \n 2oz铜厚"]
B --> C["散热过孔阵列 \n 连接背面铜层"]
D["二级散热:初级开关管"] --> E["PCB边缘布局 \n 预留敷铜区"]
E --> F["壳体通风孔 \n 自然对流"]
G["温度监控点"] --> H["NTC传感器"]
H --> I["MCU ADC"]
end
subgraph "电气保护网络"
subgraph "初级侧保护"
J["TVS管 \n 防浪涌"] --> K["输入端口"]
L["MOV压敏电阻"] --> K
M["RCD钳位"] --> N["开关管漏极"]
end
subgraph "次级侧保护"
O["输出过压保护"] --> P["比较器+基准"]
Q["输出过流保护"] --> R["电流检测+比较器"]
S["短路保护"] --> T["VBB2355硬关断"]
end
subgraph "隔离与安全"
U["光耦隔离 \n 反馈回路"]
V["安规距离 \n 初级-次级≥6mm"]
W["绝缘测试 \n 3000VAC/1min"]
end
end
subgraph "EMI抑制措施"
X["变压器屏蔽层"] --> Y["三明治绕法"]
Z["RC缓冲电路"] --> N
AA["布局优化 \n 高频环路最小化"]
end
style N fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style C fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
点击下载：VBB2355规格书
中文
English
