High speed, high accuracy current sensor for EV inverters

March 19, 2019 //By Christoph Hammerschmidt
Allegro current sensor
For applications in hybrid and electric vehicle intervers developed Allegro MicroSystems the ACS70310 Hall effect current sensor IC. The device is designed to meet the requirements of high-current (1000A) inverters, the ACS70310 offers a highly exact, robust solution with diagnostic functions that can help improve functional safety and reliability.

The ACS70310 linear current sensor IC achieves +/-1.2% sensitivity and +/-5mV of offset error over the automotive temperature range of –40°C to 150°C. By providing both short circuit and overcurrent detection, the ACS70310 delivers an analog output voltage proportional to the applied magnetic field. The output of the ACS70310 has a response time of 2uS and a typical operating bandwidth of 240kHz. 

This current sensor IC is also extremely robust, advertises Allegro. The on-board supply regulator of the ACS70310 enables the supply pin to survive voltages of +/-18V to protect against reverse battery connection, and the output pin can survive voltages of +16 to -6V for defense against harsh automotive voltage transients. 

The sensor is field programmable by the customer to optimise both the sensitivity and offset after assembly into the final system. Several other parameters are also programmable. Customers can also order Allegro-programmed devices and conduct fast and efficient software calibration of both sensitivity and offset using their system microcontroller. 

The device incorporates a highly sensitive Hall element with a BiCMOS interface integrated circuit that employs a low noise, small-signal high-gain amplifier, as well as a low-impedance output stage, and a proprietary, high bandwidth dynamic offset cancellation technique.

The IC is provided in a thin case (1 mm thick), 4-pin SIP (single in-line package, suffix KT) that is lead (Pb) free, with 100% matt-tin lead frame plating.

More Information: ACS70310 linear current sensor IC datasheet .

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