串联电池组的母线式电压采集系统优化设计

动力电池组、燃料电池等通常采用多路串联式供电结构，单体电压参数为反映电池性能的重要指标。设计了一种母线式电压采集系统，该系统利用光控继电器把电池单体加载到测量母线，通过移位寄存器74HC164逻辑控制实现电池单体电压巡检，经过一套信号调理、隔离电路处理，使整体测量一致性提高，相比于采用译码器的逻辑电路，从元件数量和控制程序上都得到优化。集成PIC18F2580最小系统及CAN总线接口，实现模块化及可扩展性。实验结果表明：该采集系统性能稳定，满足测量精度要求，并成功应用于3 kW和10 kW燃料电池系统。

Optimal Design of Bus-type Voltage Acquisition System

Power supply system, such as power battery pack and fuel cell,normally uses a series-type power supply structure, and the voltage parameter of battery is an important performance index of the battery. A bus-type voltage acquisition system is designed. In the system, the photoelectric relay is adopted to load a battery on the measurement bus, and the voltage monitoring is implemented by means of the logic control of shift register 74HC164. Thus the consistency of the overall measurement is improved through single signal processing and isolation circuit. The number of components is reduced, and the circuit structure and control procedure are optimized compared to logic circuit with decoder. The modularization and scalability of the measurement system are achieved by PIC18F2580 minimum system and CAN bus interface. The experimental result shows that the system has stable performance and meets the requirement of measuring accuracy, which has been used for the voltage monitoring of 3 kW and 10 kW fuel cells.