Difference between revisions of "EnergyHarvesting"

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Latest revision as of 16:51, 11 September 2015

TI BQ25504

  • BQ25504 Nano Power, suitable for WSN
  • Maximum power point tracking (MPPT) is implemented in bq25504 in order to maximize the power extracted

from an energy harvester source.

  • When operating as a charger, the main storage elements must be connected to VBAT pin. Many types of

elements can be used, such as capacitors, super capacitors or various battery chemistries HARVEST-1.jpg




TI TPS61200 boost converter

  • LiPower - Boost Converter from Sparkfun at $1
  • Input voltage 0.3-5.5V
  • Output voltage 3.3 or 5V
  • 5V @ 600mA max
  • 3.3V @ 200mA max
  • Undervoltage lock out at 2.6V
  • Quiescent current, less than 55uA
  • LiPo JST connector or 2-pin header power input\
  • Inductor: 4.7uH, 1.2A Sumida CDRH2D18
  • Over temperature protection



Linear technologies LTC3108

LTC3108 BREAKOUT.png LTC3108.png 

The LTC3108 is a highly integrated DC/DC converter ideal for harvesting 
and managing surplus energy from extremely low input voltage sources 
such as TEGs (thermoelectric generators), thermopiles and small solar cells. 
The step-up topology operates from input voltages as low as 20mV.

Using a small step-up transformer, the LTC3108 provides a complete power 
management solution for wireless sensing and data acquisition.

LTC3108 TRANSFORMER

The LTC3108 utilizes a depletion mode N-channel MOSFET switch to form a resonant step-up oscillator using an external step-up transformer and a small coupling capacitor. This allows it to boost input voltages as low as 20mV high enough to provide multiple regulated output voltages for powering other circuits. The frequency of oscillation is determined by the inductance of the transformer secondary winding and is typically in the range of 20kHz to 200kHz. For input voltages as low as 20mV, a primary-secondary turns ratio of about 1:100 is recommended. For higher input voltages, a lower turns ratio can be used. These transformers are standard, off-the-shelf components, and are readily available from many magnetic suppliers. The compound depletion mode FET is what makes 20mV operation possible.  Linear Technology has optimized the FET in ways not possible with discrete designs that result in much better harvesting efficiency.  

  • Coilcraft LPR-6235


LTC3108 breakout boards



Linear technologies LTC3588

LTC3588-1.jpg

Linear technologies LTC3109

  • Operates from Inputs as Low as ±30mV
  • Less Than ±1°C Needed Across TEG to Harvest Energy
  • Proprietary Auto-Polarity Architecture
  • Complete Energy Harvesting Power Management System
  • Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
  • 2.2V, 5mA LDO
  • Logic-Controlled Output
  • Energy Storage Capability for Operation During Power Interruption
  • Tool Is For Evaluation Of: LTC3105, LTC3459, LTC2935, LTC3108, LTC3109, LTC3588



BPW34 based




Rectenna




Solid State Batteries



Related links



External links



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