空间站高压锂电采集电路的安全性设计与应用研究

Study on Safety Design and Application of Acquisition Circuit for High-Voltage Li-ion Battery in Space Station

由于空间站有锂离子蓄电池组在轨更换的需求,为保障航天员在进行电池更换操作时的人身安全,电池组内设计有分断开关,但分断开关的动作会引起浪涌电流及反向过电压,影响基于AD7280芯片的锂电采集电路及下位机系统的安全。研究了在分断开关工况下浪涌电流及反向过电压的产生原理,提出了一种基于AD7280芯片的锂电采集电路的优化设计方案,通过采取反压隔离、浪涌抑制及高低压隔离等保护措施以进一步提高系统的安全性和可靠性,并通过Cadence仿真及试验进行验证,结果表明该设计方案安全、可靠、满足系统要求。

The space station requires that the Lithium-ion battery pack should be replaceable on orbit. To ensure the safety of astronauts during the battery replacement operation,the breaking switch was designed in the battery. However,the action of the breaking switch will cause surge voltage and reverse overvoltage,thus affect the safety of the AD7280 based acquisition circuit of the Lithium-ion battery and the software system. The principle of the surge voltage and the reverse overvoltage during the breaking switch operation was studied and an optimal design of battery acquisition circuit based on AD7280 was given. The surge suppression and high and low voltage isolation protection measures were taken to improve the safety and reliability of the system. Finally,the theoretical analysis was verified by Cadence simulation and experiments. The results showed that the system was safe in complex working conditions,easy to maintain and could meet the requirements of stabilization and reliability.