Driving High-Voltage Piezo sensors without using Big Capacitor banks


May 8, 2018

Medical Ultrasound Probes are Piezo sensors which are typically driven using high frequency pulses. The voltage and current levels are high while driving such probes. There is a special imaging mode called Elastography. It is a modality that maps the elastic properties and stiffness of soft tissue. For operating ultrasound probes in elastography mode, the drive waveform parameters are changed. If the supply voltages need to be stable while driving such loads, there should be very high capacitance at the output. To solve this issue, we can use floating regulators at the output of switched mode power supply rails to power the piezo driver boards.In the proposed scheme, SMPS TI Design TIDA-01352 is connected to another TI Design from Texas Instruments TIDA-01371, which is floating regulator design.

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