High performance Current sensing circuit

Most analog ICs (comparators, OP amps, instrumentation amplifiers, benchmarks, filters, etc.) are used to process
of the voltage signal. As for the devices that deal with current signals, the designers have little choice but to face much more.
The problem. This is unfortunate because the direct monitoring and measurement of current has a great advantage. By observing current flow, it is best to
To monitor motor torque, solenoid stress, LED density, solar cell light and battery power. What is needed is only
is a circuit that accurately measures current and converts the current into a voltage so that an existing voltage can be easily purchased
Amplifiers, comparators, ADCS, etc.) to amplify, adjust, and measure voltage.

Tools/Materials

• ltc2053,ltc6102

Steps/Methods

2. 1

   Connecting the resistor to the connected location seems to be the same as most simple direct current detection methods. This method, known as low-side current sensing, requires no grounding pathways that can cause current to be diverted around the sense resistor or may introduce adjacent circuit currents. If the rack is a systematic one, then inserting such a sense resistor may not be practical. Moreover, since the ground is not an ideal conductor, the ground voltages in different locations in the system may be different, so a differential amplifier must be used to achieve accurate measurements

4. 2
6. 3

   To overcome these current detection challenges, a high-end current sense amplifier has been created. These special amplifiers are used to extract a small differential voltage from a high common-mode voltage from a current with a small sense resistor. The detection voltage is then amplified and converted to a ground-based signal. In this figure, the amplifier adds a voltage equal to Vsense to Rin. Then, the current through Rin flows through the rout, providing a ground-based output voltage. For this basic function, it is clear that high-side current-sense amplifiers should have higher input impedance, high gain and high gain accuracy, a wide common-mode range, and good common-mode rejection. Perhaps less obvious is the importance of amplifier accuracy.

8. 4

   The LTC6102 also does not impair other important current detection performance. Its high impedance input limits the input bias current to low
   To 300pA. The LTC6102 can operate at input common-mode voltages up to 105V. 130dB common-mode rejection in the entire
   An offset error of less than 32uV is generated within the 100V input common-mode voltage range. In the case of fault protection, the LTC6102 has a 1us response time, allowing the device to quickly turn off the power when an unexpected load or power change occurs.

10. 5

    High-side current-sense amplifiers have inherent advantages when used to monitor and control current. Technological advancements in battery management, motor control and other fields have led to a high demand for current-sense amplifiers with higher common-mode voltages, higher accuracy, and higher accuracy. LTC6102 pioneered a new world with an impressive set of features and exceptional precision. High-end current-sense amplifiers have now reached the performance level of industry-leading precision op amps, providing designers with a simple, versatile, and highly accurate device that can replace previously less-than-accurate or complex current-sense circuits

High performance Current sensing circuit