Load current measurement amplifier composed of INA117
Source: InternetPublisher:天天都吃好吃的 Keywords: Amplifier Updated: 2024/09/11
As shown in the figure, this is a load current measurement amplifier composed of INA117. Operational amplifier A1 constitutes a voltage follower, which plays the role of isolating the signal source from the load. The power supply ±Vs supplies power to A1, and VIN is added to the load after passing through A1, that is, the power supply current of the load is provided by A1. R1 and R2 are connected in series to the power supply circuit of the power supply ±Vs to A1 as sampling resistors, which are used to detect the current flowing through the resistors. According to the "node current law", ILOAD=I1-I2, and the voltages across the two sampling resistors reflect the size of ILOAD, that is, the size of JLOAD. The voltage across the sampling resistor is input into two INA117s, amplified 10 times by INA106 and output.
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