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CAS-120TA Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

No. de pieza CAS-120TA
Descripción Electrónicos  ENERGY HARVESTING ELECTRONICS
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Fabricante Electrónico  ETC2 [List of Unclassifed Manufacturers]
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CONFIGURATION
The EHE004 has two means of signal rectification
(Normal and Superseries) and two ways to connect the
two piezoelectric wafers in a Volture™ product (Series
and Parallel).
There are also four options for the
regulated DC output (1.8V, 2.5V, 3.3V, and 3.6V). In
total there are sixteen possible configuration settings.
The vibration environment and voltage requirements
dictated by the application will determine the best
configuration settings for the EHE004.
Maximum Power Point:
The efficiency of power transfer from the piezo to the
load, and thus normalized power (mW/G), will be at
maximum when the loaded piezo voltage (for moderate
to heavy loads, equal to the average UVLO voltage) is
approximately ½ its open-circuit voltage. However, the
ouput will continue to increase with increasing vibration
amplitude. For light loads where VCAP is not depleted
to the UVLO voltage during buck operation, transfer
efficiency is inconsequential as more power is
available than the load can use.
Normal vs. “Superseries”:
The difference between ‘Normal’ and ‘Superseries’, is the
bridge rectifier connection. In the normal mode of
operation, the bridge rectifier is operated in fullbridge
mode and its output voltage is half the peak-to-peak input
voltage minus two diode drops. In the “superseries”
configuration, the rectifier operates in a half-bridge mode
with only one diode drop. The normal mode is
recommended for maximum power output at moderate
input voltages, however the halfbridge mode will allow
operation from slightly lower minimum input voltages.
Parallel vs. Series operation:
All of MIDE’s Volture products contain two piezo
elements stacked in a bimorph configuration and
pinned out independently, allowing the user to choose
between parallel and series connection. On the EHE004
board, switch SW1 selects between parallel (doubled
current, lower input voltage) and series (doubled input
voltage, lower current) connection. Generally low level
vibrations are best suited to the series configuration
and high level vibrations are best suited to the parallel
configuration. However, the optimal setting will depend
on a number of factors including which Volture product
is being used and the parameters of the vibration
environment.
The table below shows the general configuration
settings for different application types. However, each
application is unique and the optimal settings will
depend on both the application and Volture™ or other
piezoelectric element used for the energy conversion.
Table 1: General configuration guide listing for various
applications. Every application is unique and may not
fit these general settings.
3
REVISION N0. 002
REVISION DATE: 01-23-2013
EHE004
Application
(Vibration Level)
General EHE004
Configuration Settings
SW1
SW3
Very Low Amplitude
Series
Superseries
Low to Moderate Amplitude Series
or Superseries
Moderate Amplitude
Parallel Normal
High Amplitude
Parallel Normal


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