The AIT series high-precision current transducers from Hangzhi which adopted enhanced magnetic flux gate technologies, delivering an accuracy of 0.001% (10 ppm), linearity of 2 ppm, bandwidth up to 500 kHz and response time as low as 1 μs, fully meeting the stringent high-precision dynamic measuring requirements of EVs inverters, battery charging/ discharging systems and motor driving systems. The solution supports high-speed synchronous AC/DC measurement, enabling precise capture of high-frequency dynamic current signals and significantly improving the overall accuracy of measuring equipment to 0.01%. It provides a more stable and reliable measurement benchmark for development, validation and end-of-life(EOL) testing of core components in new energy systems.

Application Solutions

1. High-precision AC/DC Measurement for Inverters

As the core component for energy conversion in electric driving systems, performance of inverter directly determines the vehicle dynamic performance and energy efficiency.

Challenge: The transient current fluctuations generated by high-frequency switches (e.g., SiC based devices) are highly complex and demand extremely rigorous harmonic analysis.

Solution: Hangzhi AIT transducers establish a precise power measurement benchmark for the inverter input and output terminals, featuring ultra-high accuracy of 0.001% and a wide bandwidth of 500 kHz, ensuring accurate calculation of power conversion efficiency during R&D and quality validation phases.

2. Precision Charging & Discharging Measurement of Power Batteries

Performance of battery dynamic charging and discharging is crucial and determines mileage and safety.

Challenge: Battery pack measuring equipment requires extremely high sampling accuracy and system precision requires 0.01% level.

Solution: Leveraging the AIT series' core measurement accuracy of 0.001%, this solution directly enhances overall consistency of complete charge-discharge measuring systems to 0.01%, providing robust data support for BMS strategy optimization, precise capacity calibration and State of Health (SOH) assessment.

3. Full-parameter Synchronous Measurement of Motor Driving System

Motor bench measurement requires simultaneous acquisition of power, current, voltage and phase parameters under strong electromagnetic interference.

Challenge: During high-speed motor operation, PWM control generates significant electromagnetic interference, making it difficult for conventional sensors to maintain phase synchronization and interference resistance.

Solution: Utilizing a high-precision synchronous acquisition system combining AIT current transducer and HCV voltage sensor collocating with a power analyzer. This solution ensures real-time, synchronized collection of electrical parameters across wide bandwidth ranges, delivering a zero-bias measurement chain for motor NVH analysis and efficiency evaluation.