中圖分類號： TN722
文獻(xiàn)標(biāo)識碼： A
DOI：10.16157/j.issn.0258-7998.211477
中文引用格式： 李明明，潘文光. 一種用于電池管理系統(tǒng)的高壓多路選擇器[J].電子技術(shù)應(yīng)用，2021，47(10)：53-56，62.
英文引用格式： Li Mingming，Pan Wenguang. A high voltage multiplexer for battery management system[J]. Application of Electronic Technique，2021，47(10)：53-56，62.

A high voltage multiplexer for battery management system

Abstract： High voltage multiplexer is an important part of battery management system. The high voltage multiplexer studied at present will introduce leakage current to the battery, which will affect the accuracy of battery voltage detection. To reduce the influence of the control signal of the high voltage multiplexer on the leakage current of the battery and improve the accuracy of voltage detection, a new type of high voltage switch with gate drive was designed. The high voltage switch adopts gate bootstrap structure, can be directly cascade, and the switch control signal does not introduce leakage current to the signal source. At last, a 7-channel high voltage multiplexer was built by using 0.5 μm 40 V BCD process to carry out simulation verification. The post-simulation results show that the isolation of the adjacent channel of the high voltage switch is -47 dB@1 MHz, the maximum input voltage is 35 V, and the circuit layout area is 1.2 mm×1.5 mm, which meets the requirements of application.

Key words : BCD process；analog multiplexer；HV switch；battery management system