PX200 V5 Manual
14
13/05/2022
The most common bender actuators are parallel-
poled and driven using the ‘biased unipolar’ or
‘three
-
wire’ configuration [1], as shown in
Figure 6. Parallel-poled bender driven in the biased unipolar configuration [1].
A zero volt input results in +150V across the top piezo layer and maximum upward deflection. A 7.5V
input results in +150V across the bottom piezo layer and maximum downward deflection. The
deflection
𝛿
can be represented by
𝛿 =
𝑉
𝑖𝑛
− 7.5/2
7.5
𝛿
𝑝𝑝
where
𝛿
𝑝𝑝
is the peak-to-peak displacement of the bender.
To reduce the maximum DC voltage, a negative bias voltage can be used, as shown in Figure 7.
Figure 7. 200V Parallel-poled bender driven with dual bias sources.
In Figure 7, the deflection is
𝛿 =
𝑉
𝑖𝑛
10
𝛿
𝑝𝑝
where
𝛿
𝑝𝑝
is the peak-to-peak displacement of the bender.
References
[1]
A New Electrical Configuration for Improving the Range of Piezoelectric Bimorph Benders; S. A.
Rios, A. J. Fleming; Sensors and Actuators A: Physical, 2015.
+150 Vdc
𝛿
Parallel-poled bender, e.g.
Thorlabs PB4NB2W or
PiezoDrive BA6020
Ground
PX200-P150
HV+
CH1 Out
Ground
CH1 In
0 to +150V
0 to 7.5V
+100 Vdc
𝛿
200V parallel-poled bender,
e.g. Noliac CMBR02
-100 Vdc
PX200-N100-P100
HV+
CH1 Out
HV-
CH1 In
+/-100 V
+/-5V
