中圖分類號(hào)： TN722 文獻(xiàn)標(biāo)識(shí)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
Li Mingming1,，2，Pan Wenguang1,，3
1.Institute of Microelectronics,，Chinese Academy of Sciences，Beijing 100029,，China,； 2.School of Electronic，Electrical and Communication Engineering,，University of Chinese Academy of Sciences,， Beijing 100049，China,； 3.Nanjing Zhongke Microelectronics Co.,，Ltd.，Nanjing 210018,，China
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
在電池電壓的采集結(jié)構(gòu)中,，通常使用由高壓開(kāi)關(guān)組成的高壓多路選擇器將每節(jié)電池的電壓傳遞到后續(xù)模數(shù)轉(zhuǎn)換器(Analog to Digital Converter,，ADC)進(jìn)行模數(shù)轉(zhuǎn)換。如何降低高壓多路選擇器對(duì)電池信號(hào)的電壓損耗一直是研究的熱點(diǎn)，不少學(xué)者針對(duì)BMS系統(tǒng)的高壓多路選擇器提出了許多新穎的高壓開(kāi)關(guān)[5-15],，但是這些高壓開(kāi)關(guān)的控制信號(hào)會(huì)對(duì)信號(hào)源引入輕微的漏電流,，影響電池電壓檢測(cè)精度。
為了降低漏電流,，進(jìn)一步提高電壓檢測(cè)精度,，本文設(shè)計(jì)了一種新型柵極驅(qū)動(dòng)型高壓開(kāi)關(guān)，并采用0.5 μm 40 V BCD工藝,，搭建一個(gè)7路高壓多路選擇器進(jìn)行了后仿真驗(yàn)證,。設(shè)計(jì)的電路已經(jīng)遞交工藝廠進(jìn)行流片。
