Abstract
AbstractDeveloping a high‐performance transducer driver is essential yet challenging for air‐coupled ultrasound applications. This study introduces a MOSFET‐based bipolar high‐voltage pulse driver designed for defect detection in soft‐pack lithium batteries. High‐voltage DC generation is achieved through a push–pull inverter and full‐wave voltage multiplier circuit, producing a stable DC output. High‐speed MOSFET switching then controls the charging and discharging of a capacitor in an RC network, generating a symmetric bipolar high‐voltage pulse signal with a peak‐to‐peak voltage of 1104 V at 100 kHz. Performance evaluation experiments demonstrated that a 7‐cycle pulse train provides an optimal balance of signal penetration and time resolution, effectively preventing waveform overlap. The system reliably penetrates soft‐pack lithium batteries up to 6 mm thick, and detects internal lithium battery defects, such as 1 mm air bubbles. Overall, this bipolar high‐voltage pulse driver surpasses traditional designs in both time and frequency domains, offering enhanced detection accuracy and practicality for air‐coupled ultrasonic inspection of lithium battery defects.
Published Version
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