| 型号 : | IC646NAP000 | 品牌 : | GE/通用电气 |
| 加工定制 : | 否 | 产品认证 : | 已认证 |
| 输出频率 : | 2220kHz | 工作电压 : | 220V |
IC646NAP000
IC646NAP000
IC646NAP000
IC646NAP000
图1是INA115在心电检测电路中的实用电路。放大器的正负输入通过心电传感器分别接到人体的左臂（LA）与右臂（RA）上，与运放N和电阻R1~R4组成的驱动网络接到人体的右腿（RL）上，
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《QQ ：2479261344》
《QQ邮箱：2479261344@qq.com》构成“浮地”。由于生物信号很弱，加之有极化电位，所以该级的放大倍数不宜太高，一般取在10~100之间，并且只能作为前置放大用，为了检测安全，后级一般应再采用隔离放大电路进行隔离，且该级的电源电压应采用隔离电源模块进行提供，以达到电源及信号的完全隔离。如图2所示，
图2： 隔离型心电检测前置放大电路
以上电路是由汉为公司的T6235D与INA115等组成的隔离型心电检测前置放大电路，该电路由于其具有输入阻抗高、漏电流小、检测精度高和满足人体安全等指标完全可以达到医疗器械使用的要求标准。该电路一般作为前置放大电路，器件直接与人体接触，并拾取心电信号后通过INA115进行放大，最后由ISO122隔离传输到后置放大电路，实现人体信号与输出及电源的隔离放大。
放大器的工作电源应用选择有足够的安全爬电距离，较高的隔离电压特性以及极低的隔离电容值，使到系统的安全性能得到较好的保障，此处推荐采用金升阳公司6000VDC隔离G系列（定压输入，隔离6000VDC正负电压输出）或H系列产品（定压输入，隔离6000VDC单路电压输出），该系列产品由于其极高的隔离电压特性（6000VDC）且其具有极低的隔离电容值（≤10pF）被广泛地应用于医疗电子器械行业中。采用G1515S-1W使得INA115与人体相接触的地线与输入电源线真正意义上断开了，达到完全隔离的效果，即电源与信号的完全隔离。
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