TGP-751 datasheet(12/19 Pages) ETC2

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Micropelt - preliminary - Datasheet TE-CORE v2.5 | Page 12

Thermoharvesting Module

Micropelt TE-CORE

3.4 Power Conditioning and Management

The TE-CORE’s DC-DC booster and power conditioning

module provides a reference for a low-cost, high effi-

ciency pure thermoharvesting power supply. It conse-

quently uses carefully selected off-the-shelf compo-

nents in a electronic circuit which best leverages the

special electrical properties of our TEGs: high resistance

and high thermovoltage. Configurable power manage-

ment functions allow for flexible adaptation to a host

of ultra-low-power applications.

When connecting the TI ez430-RF2500T evaluation

board to the Micropelt TE-CORE Power Harvesting Sys-

tem please note the following notifications.

 The TI radio communication link (TI demonstration

software) requires a relative high amount of energy

for its initial radio link set-up,

 Initial link set-up needs for 100ms approximately

20mA current and operating voltage = 2.4 Volt

[energy consumption 4.8mJ]

 Change the value of capacitor C3 and add C33

1500µF capacitor (2x 1500µF = 3000µF; for exam-

ple: Vishay Model 592D158X06R3R2T20H).

 Set the comparator hysteresis to follow options:

Vcc turn “off” = 2.6 Volt; Vcc turn “ON” = 3.9 Volt.

Replace the resistor R4 –R6 to the next values:

R4 = 1.5 MΩ, R5 = 470 kΩ, R6 = 910 kΩ

The DC-DC booster is optimized for start up with low

temperature gradients.

In applications with small load currents, the efficiency

looks reduced while the energy storage device is being

changed and current being used by the load in parallel.

3.5 DC-DC Booster Characteristics

DC-DC booster output voltage is set to 2.4 Volt. Meas-

urement with FET Transistor at oscillator part

ATF-55143 and storage capacitor C3= 100 µF:

TGP-751 Datasheet(PDF) 12 Page - List of Unclassifed Manufacturers