graph LR
subgraph "传感器激励控制"
A["模拟电源3.3V"] --> B["VBK5213N \n 双N+P MOSFET"]
B --> C["传感器桥路 \n EXC+"]
B --> D["传感器桥路 \n EXC-"]
E["MCU GPIO"] --> F["电平转换"]
F --> B
C --> G["称重传感器"]
D --> G
G --> H["SIG+输出"]
G --> I["SIG-输出"]
end
subgraph "信号调理链路"
H --> J["仪表放大器"]
I --> J
J --> K["一级滤波 \n RC低通"]
K --> L["VB4290A \n 模拟开关"]
M["温度传感器"] --> L
N["校准参考"] --> L
L --> O["二级滤波"]
O --> P["24位Σ-Δ ADC"]
end
subgraph "保护电路"
Q["TVS阵列"] --> H
Q --> I
R["RFI滤波器"] --> H
R --> I
S["EMI屏蔽层"] --> G
end
style B fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style L fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
电源管理与负载控制拓扑详图
graph TB
subgraph "电池供电与主开关"
A["锂电池3.7V"] --> B["保护IC"]
B --> C["VBQF2311主开关"]
C --> D["主电源3.3V"]
E["MCU控制"] --> F["驱动电路"]
F --> C
end
subgraph "电源分区管理"
D --> G["LDO稳压器"]
G --> H["模拟电源域"]
G --> I["数字电源域"]
subgraph "负载开关阵列"
SW1["VBK5213N \n 传感器电源"]
SW2["VBQF2311 \n 显示屏电源"]
SW3["VBQF2311 \n 通信模块"]
SW4["VBK5213N \n ADC电源"]
end
H --> SW1
I --> SW2
I --> SW3
H --> SW4
SW1 --> J["称重传感器"]
SW2 --> K["LCD显示屏"]
SW3 --> L["Wi-Fi/BT模块"]
SW4 --> M["高精度ADC"]
end
subgraph "功耗管理状态机"
N["工作模式"] --> O["称重状态 \n 全功耗"]
N --> P["待机状态 \n 低功耗"]
N --> Q["睡眠状态 \n 微功耗"]
O -->|动态切换| P
P -->|定时唤醒| O
P -->|超时| Q
Q -->|外部触发| O
end
subgraph "电流监测与保护"
R["电流检测电阻"] --> S["高精度运放"]
S --> T["比较器阵列"]
T --> U["过流保护"]
T --> V["短路保护"]
U --> W["关断信号"]
V --> W
W --> C
end
style C fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style SW1 fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
保护电路与可靠性设计拓扑详图
graph LR
subgraph "三级信号保护系统"
A["一级隔离"] --> B["传感器桥路"]
C["二级滤波"] --> D["ADC前端"]
E["三级屏蔽"] --> F["模拟走线"]
B --> G["VBK5213N隔离开关"]
D --> H["RC滤波器网络"]
F --> I["包地处理"]
end
subgraph "电气应力保护"
subgraph "ESD保护网络"
J["TVS二极管阵列"] --> K["传感器接口"]
J --> L["模拟开关I/O"]
J --> M["通信接口"]
end
subgraph "过压过流保护"
N["电压箝位"] --> O["ADC输入"]
P["电流限制"] --> Q["电源开关"]
R["保险丝"] --> S["电池入口"]
end
end
subgraph "热管理与可靠性"
T["热设计"] --> U["功率器件布局"]
V["降额设计"] --> W["电压/电流/功率"]
X["寿命预测"] --> Y["MTBF分析"]
Z["环境适应性"] --> AA["温湿度范围"]
end
subgraph "故障诊断机制"
AB["在线自检"] --> AC["开关通路测试"]
AD["定期校准"] --> AE["ADC精度验证"]
AF["状态监控"] --> AG["温度/电压/电流"]
AG --> AH["MCU诊断"]
end
style G fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style J fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
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