graph LR
subgraph "主电源路径管理"
A["电池输入 \n 3.6V-12V"] --> B["TVS管 \n SMBJ12A"]
B --> C["输入滤波电容"]
C --> D["VBQG2317 \n P-MOSFET \n DFN6封装"]
D --> E["主电源输出 \n 至DC-DC"]
E --> F["3.3V/5V \n 系统电源"]
G["MCU GPIO"] --> H["驱动电阻 \n 10-100Ω"]
H --> I["VBQG2317栅极"]
I --> J["栅极去耦电容"]
K["压降采样点"] --> L["差分放大器"]
L --> M["MCU ADC \n 电池监测"]
N["故障锁存信号"] --> O["关断逻辑"]
O --> I
end
subgraph "电气保护网络"
P["反接保护 \n 二极管/PMOS"] --> A
Q["RC缓冲电路"] --> D
R["热设计 \n PCB敷铜散热"] --> D
end
style D fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style F fill:#fce4ec,stroke:#e91e63,stroke-width:2px
分区供电管理拓扑详图
graph TB
subgraph "双通道负载开关"
A["3.3V辅助电源"] --> B["VBI3328 \n 双N-MOSFET \n SOT89-6"]
subgraph B ["VBI3328内部结构"]
direction LR
GATE1["栅极1"]
GATE2["栅极2"]
DRAIN1["漏极1"]
DRAIN2["漏极2"]
SOURCE1["源极1"]
SOURCE2["源极2"]
end
B --> C["通道1输出"]
B --> D["通道2输出"]
C --> E["π型滤波网络"]
D --> F["π型滤波网络"]
E --> G["传感器域 \n 压力/温度"]
F --> H["通信域 \n LoRa/NB-IoT"]
I["MCU控制"] --> J["电平转换"]
J --> GATE1
J --> GATE2
end
subgraph "动态功耗管理"
K["工作模式控制"] --> L["占空比调度"]
L --> M["传感器:5分钟/1秒"]
L --> N["通信:1小时/10秒"]
M --> O["通道1使能"]
N --> P["通道2使能"]
O --> GATE1
P --> GATE2
end
subgraph "电流监测保护"
Q["采样电阻 \n 毫欧级"] --> R["电流检测放大器"]
R --> S["比较器"]
S --> T["过流锁存"]
T --> U["关断信号"]
U --> GATE1
U --> GATE2
end
style B fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style I fill:#fce4ec,stroke:#e91e63,stroke-width:2px
信号调理路径拓扑详图
graph LR
subgraph "多路信号切换"
A["流量传感器信号"] --> B["RC滤波器"]
B --> C["钳位保护"]
C --> D["VBTA1290-1 \n 模拟开关 \n SC75-3"]
D --> E["量程选择网络"]
E --> F["ADC输入1"]
G["电池电压"] --> H["分压电阻网络"]
H --> I["VBTA1290-2 \n 采样开关 \n SC75-3"]
I --> J["ADC输入2"]
K["外部接口"] --> L["ESD保护"]
L --> M["VBTA1290-3 \n IO保护开关 \n SC75-3"]
M --> N["MCU GPIO"]
end
subgraph "精密控制逻辑"
O["MCU控制逻辑"] --> P["定时触发"]
P --> Q["微秒级脉冲"]
Q --> R["开关控制线"]
R --> D
R --> I
R --> M
S["导通电阻监测"] --> T["线性度补偿"]
T --> U["软件校准"]
U --> V["采样精度"]
end
subgraph "功耗优化"
W["常闭路径"] --> X["静态漏电"]
Y["开关控制"] --> Z["nA级关断"]
Z --> X
end
style D fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style I fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style M fill:#fff3e0,stroke:#ff9800,stroke-width:2px
系统集成与可靠性拓扑详图
graph TB
subgraph "三级供电架构"
A["一级:常供电路径"] --> B["VBQG2317主开关 \n 维护模式控制"]
C["二级:分区供电"] --> D["VBI3328双通道 \n 按需供电"]
E["三级:信号路径"] --> F["VBTA1290阵列 \n 微秒级通断"]
B --> G["系统基础电源"]
D --> H["传感器/通信电源"]
F --> I["信号链电源"]
G --> MCU_CORE["MCU核心"]
H --> SENSOR_PWR["传感器"]
H --> COMM_PWR["通信模块"]
I --> ADC_PWR["ADC采样"]
end
subgraph "EMC与防护设计"
J["电池端防护"] --> K["TVS+滤波电容"]
L["信号线防护"] --> M["ESD器件 \n DFN1006"]
N["空间隔离"] --> O["高频DC-DC区"]
N --> P["敏感模拟区"]
Q["金属屏蔽"] --> R["水表外壳接地"]
end
subgraph "可靠性增强机制"
S["电气应力保护"] --> T["反接保护电路"]
S --> U["RC滤波+钳位"]
V["故障诊断"] --> W["电流监测"]
V --> X["电压监测"]
V --> Y["温度监测"]
Z["容错机制"] --> AA["看门狗复位"]
Z --> BB["电源监控复位"]
Z --> CC["软件恢复流程"]
end
subgraph "测试验证节点"
DD["静态功耗测试"] --> EE["皮安计测量 \n <10μA"]
FF["动态功耗测试"] --> GG["电流探头积分 \n 平均电流"]
HH["开关响应测试"] --> II["示波器测量 \n <100μs"]
JJ["环境测试"] --> KK["-40℃~+85℃ \n 高低温循环"]
end
style B fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style D fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style F fill:#fff3e0,stroke:#ff9800,stroke-width:2px
点击下载：VBI3328规格书
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