Allegro releases the industry’s first stand-alone coreless current sensor, which can reduce the size, weight and overall system cost of electric vehicle inverters

Manchester, New Hampshire, USA-Allegro MicroSystems (hereinafter referred to as Allegro), a global leader in motion control and energy-saving system power supply and sensing solutions, announced the launch of the world’s first stand-alone, Hall-less coreless current sensor ACS37612, which can achieve 1% Accurately measure PCB or busbar currents above 200A~1000A without using magnetic cores or shielding covers. The differential Hall element used by Allegro to measure the magnetic field is highly resistant to stray field interference, but does not require the laminated shielding required by competing solutions, thereby reducing the design size and bill of materials.

ACS37612 is an ideal choice to meet the demanding requirements of electric vehicle applications:

·High voltage traction Inverter phase current measurement

·48V starter generator

·Battery disconnect switch

Allegro Product Line Manager Georges El Bacha said: “Our original intention of designing the ACS37612 is to directly respond to the development trend of the electric vehicle market. This is the industry’s first truly non-magnetic core solution, which can accurately measure hundreds of people through a small size. The current of ampere has solved the huge challenge facing automotive engineers.”

Create more energy-efficient and economical electric vehicles

When the electric vehicle accelerates, the current flowing through the traction motor inverter reaches hundreds of amperes. Accurately measuring such a large current is essential to the safety performance of electric vehicles. Engineers usually rely on low-hysteresis, laminated cores for this type of measurement, using three to six cores depending on the number of motor phases.

ACS37612 eliminates the magnetic core, so electric vehicle manufacturers can reduce the size and weight of the inverter, thereby improving the energy efficiency of electric vehicles. This non-invasive, non-contact current sensor is designed to improve the thermal efficiency of the shunt solution, so it is an ideal choice for reducing the energy consumption of the 48V electric platform system.

El Bacha added: “The advantage of ACS37612 is that it can improve efficiency while reducing overall system costs. This is a win-win solution for both automakers and consumers.”

Simplify automotive solutions

ACS37612 can be used for bus bar design as well as PCB trace current design; it can provide engineers with mechanical flexibility and can simplify their system-level solutions. The sensitivity of ACS37612, the shape and position of the bus bar together determine the system coupling coefficient, so that the current detection range can be easily increased at any stage of the design.

ACS37612 adopts ultra-small package TSSOP8 (LU-8), and its PCB package size is only 3mm x 6.4mm. Combined with the design characteristics of no magnetic core, a very small and light current sensing solution can be provided.

Allegro has nearly 20 years of industry experience in providing reliable, Hall-effect-based current sensors to meet the changing needs of customers in the automotive industry. For data sheets and more detailed information on Allegro’s innovative current sensor product line (including ACS37612), please visit www.allegromicro.com. For the price of ACS37612 or to request samples, please contact Allegro Shanghai branch or local office.

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