graph LR
subgraph "同步降壓轉換器拓撲"
A["12V中間匯流排"] --> B["輸入濾波電容"]
B --> C["VBGQF1606高側開關"]
C --> D["開關節點"]
D --> E["降壓電感"]
E --> F["輸出濾波電容"]
F --> G["核心電壓(5V/3.3V)"]
D --> H["VBGQF1606低側開關"]
H --> I["功率地"]
J["降壓控制器"] --> K["柵極驅動器"]
K --> C
K --> H
L["電流檢測"] --> J
M["輸出電壓回饋"] --> J
end
subgraph "週邊保護電路"
N["輸入TVS陣列"] --> A
O["自舉電容"] --> K
P["緩衝電路"] --> C
Q["緩衝電路"] --> H
R["溫度感測器"] --> S["過溫保護"]
S --> J
end
style C fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style H fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
LNB電源路徑管理拓撲詳圖
graph LR
subgraph "高側保護開關電路"
A["12V輸入"] --> B["輸入保護"]
B --> C["VBI2202K高側開關"]
C --> D["13V/18V切換電路"]
D --> E["LNB輸出端口"]
F["MCU控制"] --> G["電平轉換電路"]
G --> H["柵極驅動"]
H --> C
I["極化控制"] --> J["電壓選擇器"]
J --> D
end
subgraph "保護網路"
K["TVS管陣列"] --> E
L["過流檢測"] --> M["比較器"]
M --> N["故障鎖存"]
N --> O["關斷信號"]
O --> C
P["ESD保護"] --> H
Q["緩衝電路"] --> C
end
subgraph "LNB負載特性"
E --> R["LNB單元"]
R --> S["典型電流: 200-500mA"]
S --> T["極化切換需求"]
end
style C fill:#fff3e0,stroke:#ff9800,stroke-width:2px
信號路徑切換拓撲詳圖
graph LR
subgraph "雙通道信號路徑切換"
A["中頻信號輸入"] --> B["信號分配器"]
B --> C["VBQD3222U通道1"]
B --> D["VBQD3222U通道2"]
C --> E["主信號路徑"]
D --> F["備份信號路徑"]
E --> G["解調器輸入"]
F --> G
end
subgraph "介面電源管理"
H["3.3V電源"] --> I["VBQD3222U電源開關1"]
H --> J["VBQD3222U電源開關2"]
I --> K["數據介面1供電"]
J --> L["數據介面2供電"]
end
subgraph "控制邏輯"
M["MCU GPIO"] --> N["控制邏輯"]
N --> O["通道1使能"]
N --> P["通道2使能"]
N --> Q["介面1使能"]
N --> R["介面2使能"]
O --> C
P --> D
Q --> I
R --> J
end
subgraph "信號完整性措施"
S["阻抗匹配網路"] --> A
T["隔離電路"] --> E
U["隔離電路"] --> F
V["旁路電容"] --> C
W["旁路電容"] --> D
end
style C fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style D fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
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