Datasheet (PDF) - Mide Technology

QPK-1001
FEATURES
DESCRIPTION
••Dual functionality: piezoelectric actuator & sensor
Midé’s QPK-1001 takes advantage of a patented
packaging process known as the “Piezo Protection
Advantage”. It allows the normally brittle piezoelectric
ceramic to be encapsulated in protective and insulating
layers. These protective layers drastically increase the
actuator’s robustness and usefulness in real world
applications.
••Hermetically Sealed for Use in Harsh Environments
••Convenient electrical termination
••Easy intergration & mounting
••Robust Polyimide Packaging
APPLICATIONS
The QPK-1001 also includes two large contact areas
for easy electrical connection to the packaged piezo
wafer via alligator clips.
••Vibration & strain sensing
••Passive vibration/strain detection
••Precise actuation
••Vibration energy harvesting
For more information please contact Midé
Technology Corporation. Email: [email protected].
QPK-1001 DIMENSIONS
POWER MEASUREMENTS
0.29 [7.4]
0.25 [6.4]
CLAMP LOCATION
0.81 0.88
[20.6] [22.4]
1.81 [46]
2.14 [54.4]
Piezoelectric material yields mechanical strain under
the influence of an externally applied electrical field,
and produces electrical potential in response to applied
mechanical strain.
Piezo energy harvesters are typically used in a
cantilevered-beam configuration, in which the
piezoelectric beam is clamped at one end while the
other end is allowed to oscillate freely in response
to vibration normal to the flat surface of the beam,
converting these vibrations to in-plane material strain.
The beam dimensions and tip mass determine the
natural frequency of the beam which can then be
tuned to match the dominant vibrational frequency of
its environment, mechanically amplifying this typically
small vibration.
PN: QPK-1001 | REVISION No. 001 | DATE: 10-08-2014 | Web: www.mide.com | Email: [email protected]
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QPK-1001
MEASURING POWER
The power output generated by the QPK-1001 in a
cantilevered configuration was determined using Midé’s
EHE004 energy harvesting conditioning circuit.
The QPK-1001 was put into a plastic clamp and mounted
to a shaker capable of generating vibrations at varying
frequencies and amplitudes. After determining the
natural frequency of the piezo package, Midé quantified
its power output at this frequency.
The EHE004 energy harvesting conditioning circuit
converts the AC output of the piezo to a regulated DC
output. It has multiple settings for voltage output: 1.8V,
2.5V, 3.3V, and 3.6V. Testing of the QPK-1001 used a
regulated output of 2.5 volts.
If the regulated DC output of the piezo is applied to a
known load, the power can be determined.
With a load that’s too low, the regulated output can’t
sustain the 2.5 voltage setting which results in a duty
cycle. A duty cycle is the percentage of one period
for which a signal is active. The period, or one cycle,
consists of both the “on time” and “off time” of a signal.
The duty cycle is a percentage as dictated by the “on
time” divided by the total time of one complete cycle.
The use of resistors allowed for power to be calculated
using the equation for dissipated power of a resistive
circuit:
P_e=V^2/R=(V∙(T/P))^2/R
where
P_e= power output [W]
V = system voltage [V]
R = resistance [Ω]
T = amount of time duty cycle is on [sec.]
P = period of duty cycle [sec.]
A range of resistors were used to accurately determine
the power output vs. load.
LOAD CURVE DATA
The load curve data was generated by clamping the
piezo to a flat surface and then subjecting it to a 50,
100, 150, or 200 volt DC signal. A load cell was under
the end of the QPK-1001 and measured the force of
the piezo when charged with the respective voltage.
A laser determined the displacement from the piezo’s
original, unstrained position.
PN: QPK-1001 | REVISION No. 001 | DATE: 10-08-2014 | Web: www.mide.com | Email: [email protected]
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QPK-1001
QPK-1001 TYPICAL PERFORMANCE POWER CHARACTERISTICS
Force vs. Displacement
Frequency vs Voltage
40
0.02
35
0.01
200 V
150 V
0.005
0
25
20
15
10
100 V
50 V
0
without mass
with 2.5 gram mass
30
Voltage per G (Volts/G)
Displacement (in)
0.015
5
0.3
0.2
0.1
0.4
0.6
0.5
Force (oz.)
0
0
50
100
150
200
Frequency (Hz.)
Power vs. Resistance (1G)
0.9
0.8
ACX piezo with 2.5 gram tip mass
ACX piezo no tip mass
0.7
Power (mW)
0.6
0.5
0.4
0.3
0.2
0.1
0
0
10000
20000
30000
40000
50000
Resistance (Ω)
PN: QPK-1001 | REVISION No. 001 | DATE: 10-08-2014 | Web: www.mide.com | Email: [email protected]
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