graph LR
subgraph "输入整流与滤波"
A["90-264VAC输入"] --> B["保险丝"]
B --> C["π型滤波器 \n 1mH工字电感"]
C --> D["2x0.1μF X2电容"]
D --> E["全桥整流"]
E --> F["高压直流母线 \n ~400VDC"]
end
subgraph "QR反激功率级"
F --> G["反激变压器初级"]
G --> H["开关节点"]
H --> I["VBQF1252M \n 250V/10.3A"]
I --> J["初级地"]
K["PWM控制器"] --> L["栅极驱动器"]
L --> I
end
subgraph "RCD箝位电路"
M["变压器初级"] --> N["UF4007"]
N --> O["1nF/1kV"]
O --> P["100kΩ"]
P --> F
end
subgraph "反馈与控制"
Q["输出电压采样"] --> R["光耦隔离"]
R --> S["反馈输入"]
S --> K
T["电流检测电阻"] --> U["CS输入"]
U --> K
end
style I fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
次级侧同步整流与输出拓扑详图
graph TB
subgraph "同步整流功率路径"
A["变压器次级"] --> B["同步整流节点"]
B --> C["VBI1322G \n 30V/6.8A"]
C --> D["滤波电感"]
D --> E["输出电容"]
E --> F["直流输出"]
F --> G["VBUS开关"]
end
subgraph "同步整流控制"
H["同步整流控制器"] --> I["驱动器"]
I --> C
J["变压器辅助绕组"] --> K["零电流检测"]
K --> H
end
subgraph "输出保护与滤波"
G --> L["Type-C接口"]
M["TVS管SMBJ5.0A"] --> L
N["输出磁珠"] --> L
O["滤波电容阵列"] --> F
end
subgraph "协议控制"
P["协议芯片PD3.0"] --> Q["CC1/CC2通信"]
P --> R["VBUS开关控制"]
R --> G
end
style C fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style G fill:#fff3e0,stroke:#ff9800,stroke-width:2px
微型化热管理与保护拓扑详图
graph LR
subgraph "两级散热架构"
A["一级: PCB导热"] --> B["2oz铜箔+散热过孔"]
B --> C["初级MOSFET VBQF1252M"]
B --> D["同步整流MOSFET VBI1322G"]
B --> E["反激变压器"]
F["二级: 壳体导热"] --> G["导热硅脂"]
G --> H["金属散热片"]
H --> I["塑料外壳表面"]
end
subgraph "电气保护网络"
J["RCD箝位电路"] --> K["吸收漏感能量"]
L["TVS保护阵列"] --> M["抑制浪涌"]
N["电流检测网络"] --> O["过流保护"]
P["电压反馈环路"] --> Q["过压保护"]
R["NTC温度传感器"] --> S["过温保护"]
T["故障锁存电路"] --> U["关断信号"]
U --> C
U --> D
end
subgraph "EMI抑制设计"
V["π型输入滤波器"] --> W["传导EMI抑制"]
X["变压器屏蔽"] --> Y["辐射EMI抑制"]
Z["PCB分区布局"] --> AA["地线分离"]
end
style C fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style D fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
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