QNP3 Hardware Manual
Piezo Engineering Tutorial
Figure C-11:
Voltage and current waveforms for the profile commanded in
Example 2
A move from 0 to 100 μm in 4 ms, dwell for 60 ms, then move back from 100 μm to 0 in 4 ms is the desired
output move profile of a stage with a piezo capacitance of 5 μF. The desired amplifier has a semi-bipolar
supply of +150 V/-30 V, a 300 mA peak current rating and a 130 mA continuous current rating. Will this
amplifier be able to supply enough current to perform this move?
Example 2 Calculations
The same calculations performed in
are performed using
,
and
. Again, the capacitance is assumed to increase by approximately 60% due to large signal conditions.
The voltage and current waveforms are shown in
.
In this example, the continuous current is below the rating of the amplifier. However, the peak current
exceeds the maximum current rating of the amplifier. Therefore, this amplifier is NOT capable of supplying
the necessary current and power to perform the desired move profile.
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Appendix C
59
