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Design Notes

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  Tiny 2-Cell Solar Panel Charges Batteries in Compact, Off-Grid Devices &mdash DN491
  PDF, 137 Kb, File published: May 13, 2011
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  Tiny 2-Cell Solar Panel Charges Batteries in Compact,
  Off-Grid Devices
  Design Note 491
  Fran Hoffart
  Introduction
  Advances in low power electronics now allow placement
  of battery-powered sensors and other devices in locations
  far from the power grid. Ideally, for true grid independence,
  the batteries should not need replacement, but instead be
  recharged using locally available renewable energy, such
  as solar power. This Design Note shows how to produce
  a compact battery charger that operates from a small
  2-cell solar panel. A unique feature of this design is that
  the DC/DC converter uses power point control to extract
  maximum power from the solar panel.
  The Importance of Maximum Power Point Control
  Although solar cells or solar panels are rated by power
  output, a panel’s available power is hardly constant. Its
  output power depends heavily on illumination, temperature
  and on the load current drawn from the panel. To illustrate
  this, Figure 1 shows the V-I characteristic of a 2-cell solar
  panel at a constant illumination. The I-vs-V curve features
  a relatively constant-current characteristic from shortcircuit (at the far left) to around 550mA load current, at …

Articles

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  Harvest Energy from a Single Photovoltaic Cell &mdash LT Journal
  PDF, 1.4 Mb, File published: Mar 30, 2011
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  April 2011 I N T H I S I S S U E dual input/output 3A
  monolithic buck with
  3V–36V input range 10 Volume 21 Number 1 Harvest Energy from a
  Single Photovoltaic Cell
  Nathan Bourgoine how to drive low power,
  1Msps, 16-bit, differential
  input ADC from singleended signals 30 maximize output power
  from current-limited USB
  and PCMCIA sources 38 dual output step-down
  controller converts 60V
  directly to 3.3V 40 POWER
  SUPPLY CONNECTOR
  DROPS WIRING DROPS CONNECTOR
  DROPS WIRING DROPS To simplify the distribution of wireless communications for
  instrumentation, monitoring and control applications, power supply
  designers strive for device grid-independence. Batteries, the
  immediately obvious solution, offer the illusion of grid independence,
  but require replacement or recharging, which means eventual
  connection to the grid and expensive human intervention and
  maintenance. Enter energy harvesting, where energy is collected
  from the instrument’s immediate environment, offering perpetual
  operation with no connection to the grid and minimal or no
  maintenance requirements. CONNECTOR …

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Manufacturer's Classification

• Power Management > Energy Harvesting