Current Sensors

Solar Energy Systems – New Market Trends in Current Sensing

December 28, 2020

P0103 - As solar installations grow larger and more ambitious by the day, new trends in current sensing are emerging for this expanding energy market.

New 400 kHz Current Sensors Enable More Sustainable Designs in Switch-Mode Power Designs

Really Cool. Really Efficient. New 400 kHz current sensors enable more sustainable designs in switch-mode power designs.

Rethink PCB Current Sensing

This article will discuss two new innovative approaches to measure currents up to 600 A in PCB: a near-lossless Hall-based current sensor with an integrated conductor and a non-invasive standalone core-free and shield-free differential Hall current sensor.

An Effective Method for Characterizing System Bandwidth in Complex Current Sensor Applications

This application note describes multiple methods for measuring and characterizing system bandwidth, with a focus on the impulse response method. Allegro’s ACS720 is the perfect device to validate the test methods outlined here.

High-Current Measurement with Allegro Current Sensor IC and Ferromagnetic Core: Impact of Eddy Currents

AN296162 - The technique of measuring bus bar current with a surrounding ferromagnetic core is common knowledge. For highcurrent measurement above 200 A, Allegro recommends using a linear IC of the A136x family

Increasing System Safety using the A1365 Programmable Linear Hall-Effect Sensor IC with Self-Test Diagnostic Mode

As safety goals multiply throughout the system design process, customers demand smart sensors that can be used to diagnose abnormalities in a system. The built-in Self-Test mode of the A1365 grants users such insight into their systems.

Achieving Closed-Loop Accuracy in Open-Loop Current Sensors

Closed-loop current sensing technology is employed in many industrial and automotive applications for accurate current sensing. Allegro MicroSystems has developed magnetic-based current sensor IC solutions that achieve near closed-loop accuracy using an open-loop topology.

Allegro's Coreless Current Sensor Solutions

June 01, 2021

The ACS3761X Hall-effect sensor IC solution family is a coreless and shield-free solution, reducing BOM and overall inverter size and weight. These differential sensors reject stray magnetic fields, reducing reliance on software. The family is optimized for a large range of currents, 100 A to >4000 ...

Rejecting stray magnetic fields in Hall-effect-based current sensors using the ACS724

August 24, 2020

Watch video explaining and demonstrating a method for rejecting stray magnetic fields in Hall-effect-based current sensors using the ACS724. This technology solves interference and cross-talk issues, greatly simplifying the use of magnetic current sensors in magnetically noisy environments, such as ...

ACS780 & ACS781: High Current Density Fully Integrated Current Sensor ICs

February 01, 2020

Allegro’s new family of fully integrated current sensor linear ICs in a new core-less package designed to sense AC and DC currents up to 100 A.

ACS712 Low-Noise 2100 VRMS Hall-Effect Current Sensor IC

January 23, 2020

The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, ...

Techniques to Minimize Common-Mode Field Interference When Using Allegro Current Sensor ICs (ACS724 and ACS780)

This application note will discuss the mechanism of CMR and focus on how to best use this mechanism through optimized circuit board design and layout for sensors that need an external magnetic core, sensors that have a core built into the package, and sensors that have an integrated ...

Shifting the Offset Voltage of Current Sensors

Most of the Allegro™ unidirectional current sensor ICs are trimmed such that the zero ampere output is at 0.1 × VCC . The advantage of having the output voltage at 0.1 × VCC  is that the output can swing slightly lower than this value before saturating.

Non-Intrusive Hall-Effect Current-Sensing Techniques Provide Safe, Reliable Detection and Protection for Power Electronics

As systems extend and expand the exploitation of the latest power semiconductors (IGBTs, MCTs, etc.) that manifest the very relentless advance in power output limits, a prerequisite (and parallel) demand for sensing these escalating current levels is (increasingly) very apparent.

Allegro MicroSystems - New Approaches to High Efficiency Current Sensing Hall Sensor ICs Save Power and Space

Recent advancements in integrated Hall-effect current sensor technology provide an alternative current sensing solution that reduces power loss, achieves most cost targets, and occupies a much smaller volume on the application printed circuit board, current sense resistor.