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TMR Coreless Current Sensing in EVs

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    May 27, 2023 2:04 AM EDT

    TMR Coreless Current Sensing in EVs

    Boston Consulting Group predicts that EVs will be more than half of all light vehicles sold by 2026. Market competition and increasingly stricter environmental regulations mean these vehicles have to become increasingly efficient. And that means efficient powertrains.Get more news about Current sensor core,you can vist our website!

    Power train designs have a direct influence on EV ranges and driving performance. According to Tesla, if you improve motor efficiency by 8 to 10 percent, range will improve by 15 to 18 percent. The more efficient a motor, the more time an EV will stay on the road.

    Efficiency is the name of game

    EVs are driving technology innovations across the board. The combination of accurate current sensors and smart MCUs with real-time control reduce latency and improve the accuracy of the motor-control loop, enabling smooth speed and torque transitions. With reduced harmonics distortion, the electrical efficiency and range improve. So do motor vibrations and torque ripple, which help prevent an uncomfortable drive. Traction inverter power density and efficiency allow the integration of various powertrain functions and ultimately increased range per charge.

    It is critical to monitor and control the EV Powertrain operation and these devices ensure consistent, improved performance with lower costs. As SkyQuest notes, “The electric vehicle industry has become a significant consumer of current sensors, greatly aided by favorable governmental laws and more remarkable technological improvements.
    These sensors ensure the consistent performance of traction inverters, a cornerstone in the EV powertrain. Any talk of efficiency starts here. Since inverters convert battery DC to AC for the electric motor, the more efficient the inverter, the more range the battery has. These traction inverters – specifically high power inverters 100A up to 1000A – are essential for EV’s acceleration and consistent speeds.

    In inverters, the 3-phase, full bridge driver converts DC battery voltage to the 3-phase AC voltage. This inverter “control loop” requires high bandwidth current sensors to improve accuracy, and to maximize motor torque and overall motor efficiency. High-side current sensors with fast response times also enable overcurrent protection during a short circuit condition from a motor phase to the system ground node. The requirement is to meet the voltage isolation, > 200 ampere (A) load current, and high bandwidth demands of HEV inverter applications.
    The biggest architectural change comes when moving from HEV to PHEV. That is the point where outside power — from the grid, possibly from an outlet at the owner’s house — now enters the vehicle. Receiving alternating current (AC) power from the outlet means the vehicle has to have an inlet, leading to an onboard charger (OBC) that converts the power to direct current (DC) to charge the battery. As the battery powers devices in the vehicle, the power stays DC but requires an inverter to change to AC to power the electric motors.