Home Blog  





30 Sep 2013

soitec-44-7-efficiency-solar-cell-537x358

A team comprised of the Fraunhofer Institute for Solar Energy Systems, Soitec, CEA-Leti and the Helmholtz Center, Berlin has just unveiled the world’s most efficient solar cell! Boasting an efficiency of 44.7%, the cell breaks the record set by Sharp just three months ago by 0.3%. The four-junction photovoltaic cell is not only dramatically more efficient than the theoretical 33.7% efficiency limit of conventional silicon-based solar PV, but it puts the team well on the road to reaching their goal of 50% efficiency by 2015.

German-French Team Unveils World’s Most Efficient Solar Cell! - [Link]

20 Jun 2013

article-2013may-choosing-a-power-management-fig4

Bill Schweber writes:

The power-management IC (PMIC) supports and manages the transducer and energy-collection channel, the energy-storage element (battery, conventional capacitor or supercapacitor), and the processor/wireless link. This critical block of any energy-harvesting design implements several major functions: Captures and extracts the random, miniscule energy from the source transducer, Transforms that extracted power into energy for the storage element, usually via a DC/DC converter, Manages the outflow of power from the storage element, while ensuring that power is not drawn when the stored energy is below a threshold value and would be wasted, Perhaps most challenging, it has to manage its own start-up sequence in the transition from when there is insufficient available stored energy for the PMIC itself.

Choosing a Power Management IC for Energy-Harvesting Applications - [Link]

14 Jun 2013

MCPapp1

Here is an app note from Microchip describing the design of a solar power DC-DC converter.

The focus of this application note is to identify how to get the maximum power out of a solar panel to power a remote application.

[via]

App note: Solar power DC-DC converter - [Link]

21 May 2013

2013-05-18_2248-600x280

An application note from Microchip: Practical guide to implementing Solar Panel MPPT Algorithms (PDF!)

This application note describes how to implement MPPT using the most popular switching power supply topologies. There are many published works on this topic, but only a tiny portion of them show how to actually implement the algorithms in hardware, as well as state common problems and pitfalls. Even when using the simplest MPPT algorithm with a well-designed synchronous switching power supply, it can be expected that at least 90% of the panel’s available power will end up in the battery, so the benefits are obvious.

[via]

Practical guide to implementing Solar Panel MPPT Algorithms - [Link]


16 May 2013

Super Capacitors have become more popular over the past 5 years and are beginning to replace batteries in some applications. Charging a super cap can be tricky especially if you want to avoid damaging it. Here is a basic circuit that will allow you to charge a super capacitor with a solar panel.

How to Charge a Super Capacitor  with a Solar Panel - [Link]

14 May 2013

Untitled-1

Battery-Charging Controllers for Energy Harvesters by Jon Gabay:

Whether your energy harvesting application uses large solar panels with high voltages and currents or, more often the case, must make do with minute amounts of power derived from various other ambient energy sources, one thing is almost certain: some type of energy storage is on board, whether in the form of a small rechargeable lithium ion battery, a supercapacitor, or solid-state energy storage technology. For the engineer this means that not only do we need to design circuits to harvest and convert ambient energy, but we also have to include an energy-harvesting interface (and protection circuitry) as well as a charge controller. This article looks at single chip energy harvesting devices that also provide some form of charge control. It discusses the different conditions under which energy can be extracted as well as what to expect when trying to squeeze power out of the ambient environment. Finally, the article will present some typical integrated solutions for small-sized low-power energy-harvesting designs.

Battery-Charging Controllers for Energy Harvesters - [Link]

16 Mar 2013

A special circuit is needed when charging a battery from a Solar Panel. When the solar panel is not providing any power the battery might start draining current into the panel. One common solution is to have a diode in series with the charging circuit to keep the current from going back to the solar panel. The problem with using a diode is the voltage drop across the diode reduces the available voltage for charging.

This circuit is great because the LTC4357 prevents the current back feeding into the panel without having the voltage drop limitation of the diode circuit

Solar Panel Charging Circuit - [Link]

3 Feb 2013

Solar celx600l

The following is important because with flexible organic photovoltaic cells, we are nearing a new era of development for practical solar-based solutions can be implemented with clever usage of these devices. Efficiency needs to be higher, but technology is progressing in the right direction and a breakthrough is inevitable.

Heliatek announced a record breaking 12.0% cell efficiency for its organic solar cells. This world record, established in cooperation with the University of Ulm and TU Dresden, was measured by the accredited testing facility SGS. The measurement campaign at SGS also validated the superior low light and high temperature performances of organic photovoltaics (OPV) compared to traditional solar technologies.

New world record for organic solar technology with a cell efficiency of 12% - [Link]

16 Jan 2013

peel_and_stick_solar_cells_figt

Researchers at Stanford University claim to have developed the world’s first peel-and-stick thin-film solar cells (TFSCs) that don’t require any modification of existing processes or materials. The new process would allow the creation of decal-like solar panels that could be applied to virtually any surface.

Unlike with standard thin-film solar cells, the new process doesn’t require direct fabrication on a final carrier substrate. Instead, a 300-nm film of nickel (Ni) is deposited on a silicon/silicon dioxide (Si/SiO2) wafer, on which thin-film solar cells are then deposited using standard fabrication techniques, and covered with a layer of protective polymer. A thermal release tape is then attached to the top of the thin-film solar cells as a temporary transfer holder. [via]

Peel-and-stick solar cells - [Link]

19 Dec 2012

295450-solar_inverter_teardown_fig2t

This teardown article will delve into the architectural design and components of a solar inverter card starting from the Solar panel DC inputs and working our way through the DC to AC conversion process to the AC output that is sent out to the power grid. We will show what features need to be implemented into such a design to meet various safety and other performance standards as well as stringent power company demands upon the signal that is put onto their grid.

Teardown: The power inverter – from sunlight to power grid - [Link]



 
 
 

 

 

 

Search Site | Advertising | Contact Us
Elektrotekno.com | Free Schematics Search Engine | Electronic Kits