商铺名称:厦门盈亦自动化科技有限公司
联系人:刘莉(小姐)
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固定电话:
企业邮箱:3001679289@qq.com
联系地址:厦门市集美区杏林禹州中央海岸一期5号楼923室
邮编:361022
联系我时,请说是在五金机电网上看到的,谢谢!
R2U1N1D0C0T0A驱动器
.组合代换
组合代换就是把同一型号的多块IC内部未受损的电路部分,重新组合成一块完整的IC,用以代替功能不良的IC的方法。对买不到原配IC的情况下是十分适用的。但要求所利用IC内部完好的电路一定要有接口引出脚。
非直接代换关键是要查清楚互相代换的两种IC的基本电参数、内部等效电路、各引脚的功能、IC与外部元件之间连接关系的资料。实际操作时予以注意:
⑴集成电路引脚的编号顺序,切勿接错;
⑵为适应代换后的IC的特点,与其相连的外围电路的元件要作相应的改变;
⑶电源电压要与代换后的IC相符,如果原电路中电源电压高,应设法降压;电压低,要看代换IC能否工作。
⑷代换以后要测量IC的静态工作电流,如电流远大于正常值,则说明电路可能产生自激,这时须进行去耦、调整。若增益与原来有所差别,可调整反馈电阻阻值;
⑸代换后IC的输入、输出阻抗要与原电路相匹配;检查其驱动能力。
⑹在改动时要充分利用原电路板上的脚孔和引线,外接引线要求整齐,避免前后交叉,以便检查和防止电路自激,特别是防止高频自激;
[7]在通电前电源Vcc回路里再串接一直流电流表,降压电阻阻值由大到小观察集成电路总电流的变化是否正常。
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SSLKEY-GED |
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KEY M5 |
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R2U1N1D0C0T0A驱动器
继电保护的技术发展,与电子、信息、通信等技术的发展密不可分。未来,随着电子式CT(电流互感器)和PT(电压互感器),的逐步应用、IEC61850标准化规约的进一步完善,可以预见,数字化技术将得到更加广泛的应用。国内已有110千伏、220千伏电压等级的电子式CT、电子式PT投入试运行,研发适用于电子式CT和PT的继电保护设备,将推动继电保护技术的发展,带动继电保护新原理、新技术和新应用的变革,成为摆在继电保护科研人员面前的新课题。
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