Development of High-Voltage Short-Pulse Signal Generator for Ultrasonic Transducer Excitation

High-voltage short-pulse generators play a crucial role in diverse applications within both industrial and biomedical sectors. Among these applications, one notable example is its use in industrial 5-l0 MHz ultrasonic transducers, which require sub-100ns high negative voltage pulse for measuring pipeline thickness and offering up to 0.1 mm precision. However, generating these signals is a challenging task. In this paper, two circuit techniques have been proposed to generate high-voltage short-pulse signals. The first circuit utilizes a combination of a variable resistor and a variable capacitor to adjust the width of the generated signal. It also incorporates two inverters and a power MOSFET to generate a high negative voltage pulse. This circuit successfully generates a -150V pulse with a duration of 75ns. The second circuit relies solely on a variable capacitor to control the pulse width. It includes a logic circuit and a power BJT to produce a high negative pulse, resulting in a -220V pulse with a width of 90μs. Both circuits have been verified either by simulation or experimental testing.