Figure 3 shows an example of a piezoelectric transducer driver. To achieve 40V square-wave, a piezo amplifier driver is used to boost the generator signal and outputs high voltage and high current to drive the piezoelectric actuator. Consequently a high output voltage and high output current piezo amplifier driver is required to drive such transducers.įor instance, an actuator/motor specifies 40V peak voltage, but a lab signal generator can only output is 5V or less. Piezoelectric devices often require voltage in the range of 20V or more. Their output voltage is even lower when the PZT transducer impedance is lower than 50 ohm. Signal and function generators commonly found in labs can output less than 5V into a 50 ohm load. Furthermore for AC piezo devices that have any combination of high capacitance, high voltage, or high frequency will require a high current driver. Higher frequency requires even more current.Īs discussed above, the piezo transducer device’s operating voltage range can be anywhere from 10V to 200V or more. The piezo driver must be able to output such high current, high voltage, and high frequency at the same time. ![]() For a high-frequency piezoelectric actuator whose capacitance is 1.1uF, the required peak voltage is 30V, and the driving frequency is 15kHz the peak current required from the driver is about 2.5A (5.0A peak-to-peak).
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