Current Sensor

The ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems.

841 Views, 03 Nov 2017 12:40 pm

Description

The ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The current sensor consists of 3 pins: VCC, GND, OUT.

As it is the analog sensor we need to connect the output pin of the current sensor to the analog pin of the Arduino board. The operating voltage is 5v. There are different current sensors which will measure the current values according to their range. The different ranges of current sensors are 5A, 20A, 30A. The device consists of a precise, low-offset, linear Hall circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope (>VIOUT(Q)) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sampling. The internal resistance of this conductive path is 1.2 m? typical, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads (pins 5 through 8). This allows the ACS712 to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. Features • 100 mV/A output sensitivity • 5.0 V, single supply operation • Output voltage proportional to AC or DC currents • Factory-trimmed for accuracy • Extremely stable output offset voltage • Nearly zero magnetic hysteresis • Ratiometric output from supply voltage • Low-noise analog signal path • Device bandwidth is set via the new FILTER pin • 5 µs output rise time in response to step input current • 80 kHz bandwidth • Total output error 1.5% at TA = 25°C • Small footprint, low-profile SOIC8 package • 1.2 m? internal conductor resistance • 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 Applications: • Can be used to detect the current consumption of machines and other industrial equipment.