Array Converter (Array) is a Sunnvale, California, company that designs inverter-less solar power systems to directly convert the direct current (DC) electricity produced by solar modules into alternating current (AC) for the grid.

Array owns several patents relating to its converter technology, including U.S. Patent No. 7,884,500 and a patent family consisting of U.S. Patents Nos. 7,719,864, 7,929,324, and 7,929,326 (collectively “Converter Patents”).

The Converter Patents are directed to a DC to pulse amplitude modulated (PAM) current converter, which is referred to by its acronym, PAMCC, and to electrical power conversion systems comprising arrays of PAMCCs.

A PAMCC (400) receives direct current from a photovoltaic panel (401) through positive and negative input terminals (402, 403), each connected in series with coils L1 (406) and L2 (405), respectively. These coils comprise a single transformer T1 (407).

A controller (412) controls several independent lines (419-422) of circuits (423-426). Capacitors (438, 440) are across the input side of coils (430, 432), respectively and a neutral output terminal (432).

Control signals on lines 411 and 419-422 connect and disconnect the current provided by the PV panel (401) in sequence within the PAMCC (400) in such a way as to provide an output whose amplitude is a PAM signal approximating a sine wave.

Several claims of the Converter Patents are directed to a plurality of PAMCCs and recite the following key feature:

the current pulses of at least two converters are out of phase with respect to each other, thereby summing the current pulses of all of the converters such that a signal modulated onto the pulse output of the converters is demodulated

According to the Converter Patents, when an array of PAMCCs are connected in parallel such that the PAMCCs’ output pulses are out of phase with respect to each other, the result is an AC current waveform suitable for both local load use and connection to the utility grid:

An array of PAMCCs constructed in accordance with the present invention form a distributed multiphase inverter whose combined output is the demodulated sum of the current pulse amplitude modulated by each PAMCC. If the signal modulated onto the series of discontinuous or near discontinuous pulses produced by each PAMCC was an AC current sine wave, then a demodulated, continuous AC current waveform is produced by the array of PAMCCs. This AC current waveform is suitable for use by both the “load”, meaning the premises that is powered or partially power by the system, and suitable for connection to a grid. For example, in some embodiments an array of a plurality of PV-plus-PAMCC modules are connected together to nominally provide split-phase, Edison system 60 cps 240 volt AC to a home.

Other advantages discussed by the Converter Patents include that the high voltage portion of the PAMCC is physically very small (a few square inches) and can be located on the back of a solar panel assembly, making insulation simple and lightweight.

Array’s web site touts the simplicity of the inverter-less technology and notes that it is “less than a quarter of the complexity of the simplest power inverter without the need of short-lived filled or plastic film components.”

The bottom line, though, is cost:

Simplicity means every cost is reduced while Array Converter improves LCOE by both reducing each cost and increasing energy harvest.

Eric Lane is a patent attorney at Luce, Forward, Hamilton & Scripps in San Diego and the author of Green Patent Blog. Mr. Lane can be reached at elane@luce.com.

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An Irish university has launched the world’s largest hydro-electric wave energy converter off the coast of northern Scotland.

The so-called Oyster is a mechanically-hinged flap that is embedded into the sea floor — at a depth of about 32 feet (10 meters) — and moves with the motions of the waves. That wave energy pumps high-pressure water to a shore-based electric turbine.

Power will be fed into the national grid and provide electricity to homes in the Orkney islands. Researchers say a farm of 20 Oysters could eventually provide enough electricity to power 9,000 three-bedroom homes.

The technology was developed by Queen’s University Belfast and Scotland-based Aquamarine Power Ltd.

“Devices such as these have the power to revolutionize the world’s energy industry and help combat climate change,” said Trevor Whittaker, professor in the Queen’s School of Planning, Architecture and Civil Engineering and lead investigator for the project.

School officials say wave and tidal power could one day provide 20 percent of the UK’s energy needs.

VIDEO: The mechanically-hinged flap, which is embedded into the sea floor at a depth
of about 32 feet (10 meters), moves with the motions of the waves. That wave energy pumps
high-pressure water to a shore-based electric turbine.

Article appearing courtesy of Yale Environment 360

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• No Inverter Required: Analyzing Array’s Patented PAM Current Converters
• Why Tidal Power is Europe’s Best Near-Term Ocean Energy Technology
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• Australia Invests in World’s First Utility-Scale Wave Power Project
• Pumped Hydro: Part of the Solution to Our Energy Storage Needs