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BQ76952: 自研的短路控制电路测试多次,存在问题,都无法通过。

Part Number: BQ76952

16串电池包总压53.4V、软件配置短板保护电流为40A,120us、5000W 1欧电阻、空开

 

测试1:在输出正负极间串一个5000W 1欧电阻和空开,闭合空开,触发短路保护,正常保护MOS未损坏。测到放电MOS栅极G和源极S波形见下图。绿色为G波形、红色为S波形,放大波形观察G点电压在掉至总压时以与S重合,即MOS完全关断

测试2:测试1完成后去除输出端串接的5000W 1欧电阻,直接通过空开短路,,显示触发短路保护,但MOS管损坏。