PPTC041LGBN-R datasheet(6/8 Pages) ETC2

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OPERATION

The EHE004 performance was measured while

connected to a Volture™ V25W piezoelectric energy

harvester.

The system was properly clamped and

tuned using the procedures detailed in the Volture™

datasheet. The assembly was attached to a shake

table to generate vibrations to test the system. The

shake table was driven by a function generator and the

amplitude was measured with an accelerometer. To

determine average power, the output duty cycle at the

known output voltage over a fixed 1.00K-ohm load was

measured.

Performance measurements were taken at 0.25g,

0.50g, 0.75g, and 1g amplitudes. The lowest amplitude

at which the EHE004 input exceeded the UVLO

threshold, producing a usable output, was also

recorded. The figure below shows the results for these

tests.

For the same amplitude conditions, other

Volture™ products would exhibit similar performance

characteristics though with different power output

levels.

Typical average power output levels for

Volture™ energy harvesting products can be found on

the Volture™ datasheet.

This representative figure shows how the different

settings on the EHE004 can be used most efficiently

given the vibration profile that this specific energy

harvester with this tip mass was subjected to. For lowest

amplitude vibrations (in this instance below 0.175 gee)

REVISION N0. 002

REVISION DATE: 01-23-2013

0.2

0.4

0.6

0.8

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

V25W, 1.8V,

75 Hz, 2.4 gram Tip Mass, Reg Cap

Amplitude (g)

Normal, Series

Normal, Parallel

Superseries, Series

Superseries, Parallel

Vout

setting (V)

UVLO

rising (V)

UVLO

falling (V)

Vmpp (V)

Vmin (V)

Vripple @

Vin=UVLO

(mV)

Vripple @

Vin=20 (mV)

1.8

4.04

2.87

7.4

3.1

120

160

2.5

4.04

2.87

7.5

3.1

120

160

3.3

5.05

3.67

9.3

3.6

140

280

3.6

5.05

4.02

9.6

3.6

160

300

NOTE 1: Approximate maximum power point (open-

circuit piezo voltage) at which power transfer to the

load is maximized.

NOTE 2: Minimum start-up voltage in halfbridge

(“superseries”) configuration.

NOTE 3: Ripple values measured at no load and the

10uF onboard output capacitance.

PERFORMANCE PLOTS

EHE004

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