PiezoDrive PDUS210 Manual And Specifications page 13

12.3 Power Control
When operating with constant voltage or current, a limit can be set on the maximum power
dissipation in the load. This power is the sum of dissipation in the mechanical load and the transducer
itself.
In some applications, such as welding and cleaning, it may be preferable to control the dissipated
power rather than the vibration amplitude. The PDUS210 has a power control function that varies the
voltage to maintain a constant power dissipation in the load. As shown in the Figure 7, the power
control loop includes the power measurement �� which is compared to the power set-point �� . The
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gain of the controller �� is tuned experimentally to provide a fast transient response and stability.
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Phase Frequency Signal Power
Transformer
Setpoint Controller Generator Amplifier
Transducer
Ground
Connection
Phase and Power Detector
Figure 7. Phase and power control loop in the PDUS210 driver.
PDUS210 V5 Manual 13 Modified 17/12/2022