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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。
Due to the demand of on-orbit replacement of lithium-ion battery pack in space station, in order to protect astronaut’s personal safety during battery replacement operation, a disconnecting switch is designed in the battery pack. However, the action of breaking switch causes surge current and reverse overvoltage , Affecting the safety of the lithium battery acquisition circuit and the lower computer system based on the AD7280 chip. In this paper, the principle of inrush current and reverse overvoltage under the condition of breaking switch are studied, and an optimized design scheme of lithium battery collecting circuit based on AD7280 chip is proposed. By adopting anti-voltage isolation, surge suppression and high and low voltage isolation Protection measures to further improve system safety and reliability, and verified by Cadence simulation and experiment, the results show that the design is safe, reliable and meet the system requirements.