graph TB
subgraph "高压侧原边电路"
A["高压电池输入 \n 400-800VDC"] --> B["输入滤波与保护"]
B --> C["预充电电路"]
C --> D["反激/LLC拓扑"]
subgraph "高压主开关"
E["VBQF125N5K \n 250V/2.5A \n DFN8(3x3)"]
end
D --> E
E --> F["高频变压器 \n 原边绕组"]
F --> G["原边地"]
H["隔离型PWM控制器"] --> I["隔离栅极驱动器"]
I --> E
end
subgraph "低压侧副边电路"
F --> J["高频变压器 \n 副边绕组"]
J --> K["同步整流电路"]
K --> L["输出滤波"]
L --> M["低压输出 \n 28V/48VDC"]
N["次级侧控制器"] --> O["同步整流驱动器"]
O --> P["同步整流MOSFET"]
end
subgraph "隔离与保护"
Q["隔离反馈网络"] --> H
R["原边电压检测"] --> H
S["原边电流检测"] --> H
T["RCD钳位电路"] --> E
U["TVS保护"] --> I
end
M --> V["低压配电单元"]
style E fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
冗余电源管理与精密驱动拓扑详图
graph LR
subgraph "双路冗余电源切换"
A["主电源28V"] --> B["VB5460通道1 \n N沟道"]
C["备用电源28V"] --> D["VB5460通道1 \n P沟道"]
subgraph VB5460_1 ["VB5460芯片1 \n SOT23-6封装"]
direction TB
GATE_N1["栅极N"]
GATE_P1["栅极P"]
SOURCE_N1["源极N"]
SOURCE_P1["源极P"]
DRAIN_N1["漏极N"]
DRAIN_P1["漏极P"]
end
B --> SOURCE_N1
C --> SOURCE_P1
DRAIN_N1 --> E["或逻辑节点"]
DRAIN_P1 --> E
E --> F["飞控系统供电"]
G["冗余控制逻辑"] --> GATE_N1
G --> GATE_P1
end
subgraph "精密传感器供电管理"
H["VB5460通道2 \n N沟道"] --> I["关键传感器 \n IMU/空速管"]
J["VB5460通道2 \n P沟道"] --> K["传感器地"]
subgraph VB5460_2 ["VB5460芯片2 \n SOT23-6封装"]
direction TB
GATE_N2["栅极N"]
GATE_P2["栅极P"]
SOURCE_N2["源极N"]
SOURCE_P2["源极P"]
DRAIN_N2["漏极N"]
DRAIN_P2["漏极P"]
end
L["28V电源"] --> SOURCE_N2
SOURCE_P2 --> K
DRAIN_N2 --> I
DRAIN_P2 --> K
M["电源管理MCU"] --> GATE_N2
M --> GATE_P2
end
subgraph "低压大电流驱动"
N["28V电源"] --> O["VBQG1620 \n 60V/14A \n DFN6(2x2)"]
O --> P["输出滤波"]
P --> Q["负载:舵机/风扇"]
R["电机驱动器"] --> S["栅极驱动器"]
S --> O
T["电流检测"] --> R
U["续流二极管"] --> O
end
style VB5460_1 fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style VB5460_2 fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style O fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
三级热管理与保护拓扑详图
graph TB
subgraph "三级散热架构"
A["一级散热: PCB传导"] --> B["VBQG1620驱动芯片 \n 通过厚铜箔散热"]
C["二级散热: 混合冷却"] --> D["VBQF125N5K隔离开关 \n PCB+散热凸台"]
E["三级散热: 自然对流"] --> F["VB5460控制芯片 \n 环境冷却"]
subgraph "PCB热设计要素"
G["2oz厚铜箔"] --> B
H["多层板内层铜箔"] --> B
I["散热过孔阵列"] --> B
J["大面积接地铜皮"] --> D
K["热焊盘设计"] --> D
end
L["温度传感器网络"] --> M["热管理控制器"]
M --> N["风扇PWM控制"]
M --> O["降频保护逻辑"]
N --> P["主动冷却风扇"]
end
subgraph "航空级电气保护"
Q["RCD钳位网络"] --> R["VBQF125N5K关断尖峰吸收"]
S["TVS瞬态抑制"] --> T["栅极驱动保护"]
U["RC吸收电路"] --> V["感性负载瞬态抑制"]
W["续流二极管"] --> X["VBQG1620感性续流"]
Y["双重过流检测"] --> Z["快速关断保护"]
AA["电压降额设计 \n Vds<80%额定"] --> R
AA --> X
BB["电流降额设计 \n Id<60%额定"] --> X
CC["温度降额设计 \n Tj<125°C"] --> ALL_COMPONENTS["所有功率器件"]
end
style B fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style D fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style F fill:#fff3e0,stroke:#ff9800,stroke-width:2px
点击下载：VB5460规格书
中文
English
