PPTC041LGBN-R datasheet(3/8 Pages) ETC2

3 / 8 page

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.

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

PPTC041LGBN-R датащи(PDF) 3 Page - List of Unclassifed Manufacturers

PPTC041LGBN-R датащи(HTML) 3 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8

датащи скачать

ссылки URL