NL1021591C2 - Photovoltaic device has photovoltaic modules secured to frame acting as conductor for current generated - Google Patents

Photovoltaic device has photovoltaic modules secured to frame acting as conductor for current generated Download PDF

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Publication number
NL1021591C2
NL1021591C2 NL1021591A NL1021591A NL1021591C2 NL 1021591 C2 NL1021591 C2 NL 1021591C2 NL 1021591 A NL1021591 A NL 1021591A NL 1021591 A NL1021591 A NL 1021591A NL 1021591 C2 NL1021591 C2 NL 1021591C2
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NL
Netherlands
Prior art keywords
carrier
modules
photovoltaic
bodies
module
Prior art date
Application number
NL1021591A
Other languages
Dutch (nl)
Inventor
Henk Oldenkamp
Original Assignee
Energieonderzoek Ct Petten Ecn
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Energieonderzoek Ct Petten Ecn filed Critical Energieonderzoek Ct Petten Ecn
Priority to NL1021591A priority Critical patent/NL1021591C2/en
Priority to NL1021591 priority
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Publication of NL1021591C2 publication Critical patent/NL1021591C2/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/02002Arrangements for conducting electric current to or from the device in operations
    • H01L31/02005Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
    • H01L31/02008Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00Supporting structures for PV modules
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00Supporting structures for PV modules
    • H02S20/20Supporting structures directly fixed to an immovable object
    • H02S20/22Supporting structures directly fixed to an immovable object specially adapted for buildings
    • H02S20/23Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures
    • Y02B10/12
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

Photovoltaic modules (2) are secured to a frame which acts as a conductor for the current generated by the modules. A device (1) for converting sunlight into electricity comprises at least one photovoltaic module secured to a frame which also acts as a conductor for at least some of the current generated by the module(s).

Description

Photovoltaic device without wiring

The invention relates to a photovoltaic installation for the conversion of sunlight into electricity built up from one or more modules, the supporting structure for the module (s) also serving as a conductor of the generated current. If the installation comprises several modules, in a preferred embodiment of the installation these are electrically connected in parallel by means of the common carriers and connected to an inverter. A complete photovoltaic system can be made up of several installations.

A photovoltaic device is known which is composed of a number of photovoltaic modules, each of which comprises a laminate that is composed of a carrier plate, a number of electrically coupled solar cells and a transparent cover plate. The photovoltaic modules in this device are mounted on a steel or aluminum frame, and electrically connected in series with each other using junction boxes (junction boxes) and flexible cables. In an electric series connection, the device supplies a certain power at high voltage and low current. This makes it possible to use connecting cables with a relatively small cross-section, while converting direct voltage to alternating voltage with a sufficiently high efficiency is possible.

This device is intended, for example, for placement on the roof of a building, for the energy supply of that building.

The known photovoltaic device has a number of disadvantages. Installation is labor-intensive, requires the deployment of trained, qualified personnel and is therefore costly. In addition, a photovoltaic device with modules in an electric series circuit entails the disadvantage that it is susceptible to failure of modules, for example as a result of defects or shadings, which results in a decrease in efficiency.

It is an object of the invention to provide a photovoltaic device that can be installed in a simple and therefore cost-saving manner, for example on the roof of a building.

It is furthermore an object to provide such a device that can be assembled from a relatively small number of components. It is another object to provide a photovoltaic 1021591 device in which the failure of a module does not affect the efficiency of other modules in that device.

These objectives are achieved with a modularly assembled photovoltaic device of the type mentioned in the preamble, wherein according to an embodiment of the invention the carrier bodies are electrically isolated from each other and can be electrically coupled to the module, the first electrical contact point being connectable to the first carrier body and the second electrical contact point can be coupled to the second carrier body.

In a photovoltaic device according to an embodiment of the invention, the carrier bodies are used both for attaching photovoltaic modules and for transporting electric current generated in those modules. As a result, it is to a lesser extent or even not at all necessary to provide cables and junction boxes for power transport, which results in substantial cost savings. For attaching modules, the carrier bodies must have a cross-section that is so large that the carrier bodies, if they are made of a highly conductive material, are suitable for transporting relatively high currents. In a photovoltaic device with several modules, in which relatively high currents can be transported, it is possible to connect the modules in parallel. A further cost saving is hereby achieved because it is not necessary to take safety measures which are required in a series-connected device according to the prior art, in which relatively high voltages occur. Among the components that can be omitted in a device according to the invention include bypass diodes and internal wiring for them, direct current fuses, over voltage protections, isolation monitoring circuits and safety earths, connectors for high direct voltages and of course direct current cables and junction boxes therefor.

In embodiments of a device according to the invention, the carrier bodies are made of aluminum or steel.

In yet another embodiment, the carrier bodies are formed by elongated carrier beams extending parallel to each other.

In a special embodiment, the carrier bodies are formed by three elongate carrier beams extending parallel to each other, at least two of which carrier beams are electrically insulated from each other and electrically connectable to the module, the first electrically contact point is connectable to the first carrier beam and the second electrical contact point is connectable to the second carrier beam, the distance between the first and second carrier beam being small with respect to the distance between the third and the first or the second carrier beam.

In an embodiment of a photovoltaic device according to the invention in which modules can be electrically coupled to the carrier bodies in a simple manner, the first and second contact point of each of the modules are each provided by a strip of a flexible electrically conductive material.

This strip of flexible material comprises, for example, a metal layer provided on a plastic film, for example a layer of aluminum.

This plastic film is, for example, a polyethylene film or a polyester film.

In yet another embodiment of a photovoltaic device according to the invention, in which the modules have a flat laminar structure, the modules are mounted on the carrier bodies by means of coupling bodies clamped around an edge zone of the respective modules, the coupling bodies each preferably under a force supplied by a compression spring is clamped around the respective edge zone, and more preferably the coupling bodies and the carrier bodies are provided with interlocking claw-shaped edge profiles for attaching the coupling bodies to the respective carrier bodies.

In an advantageous embodiment, the respective claw-shaped edge profiles interlock under a force supplied by a compression spring.

In a particularly advantageous embodiment of a photovoltaic device according to the invention, in which the modules have a flat laminar structure and are mounted on the carrier bodies by means of coupling bodies clamped around an edge zone of the respective modules, the coupling bodies are each under a compression spring force supplied is clamped around the respective edge zone and the coupling bodies and the carrier bodies are provided with claw-shaped edge profiles interlocking under a force supplied by the compression spring for attaching the coupling bodies to the respective carrier bodies.

A compression spring in a coupling body is preferably provided with a pressure element that can be supported on a surface of a carrier body for locking between a surface and that pressure element under a force supplied by the pressure spring a contact point of a photovoltaic module provided a strip of a flexible electrically conductive material.

With a photovoltaic device according to the invention, as a result of the use of the carrier bodies in a frame for transporting electric current relative to a device according to the prior art, costs of material and parts are saved, and the costs for installing time required for the device.

A device according to the invention with several modules is inherently safe as a result of the parallel connection of the photovoltaic modules, in that the occurring voltages can remain lower than 30 V. Insulation of the current conductors is hereby superfluous, while the risk of fire in the device due to short-circuiting or overheating is virtually excluded. An additional advantage of a device with modules connected in parallel is the high efficiency, because partial shading or failure of only one module has no consequences for the operation of the other modules.

The simple method of attaching and connecting the modules in a device according to the invention results in a considerable saving in labor costs, while the reliability of the device as a result of the industrial preparation of installation components is very high.

An additional advantage of a device according to the invention is the lack of the necessity to provide the individual modules with an edge profile, which leads to a further saving of costs.

The indication "positive contact point" mentioned earlier in the text should be understood as a contact point that has a higher potential than another contact point on the same module that is referred to as "negative" and vice versa.

A number of forces can work on a module. Among other things, the gravity, the forces by the wind, forces by thermal expansion, mechanical stresses, and forces by snow, ice or rain on the module. More specifically, modules must sometimes be walkable and at least be resistant to the weight of 30 (large) birds or other animals. All these and other conceivable forces must be passed through the carrier bodies, which together can again be referred to as the frame, so that the module remains in place. A preferred embodiment of the invention utilizes the current conductors that connect the modules to the inverters to transmit the forces or a portion thereof. The material used for the current conduction therefore has a dual function. This is advantageous because it requires less material than in the case of a load-bearing structure without a conductive function together with a conductor without a load-bearing function. In a preferred embodiment, at least one conductor is dimensioned such that more than 90% of forces and more in particular at least 30% and even more particularly 10% of the forces are passed on to a module. This is possible, for example, if the conductor carries the entire module. The lower percentages apply in particular if a module rests on several supports, at least one of which also has a conductive function.

In a preferred embodiment of the coupling pieces with which the connection between the modules and the carrier bodies can be established, these coupling pieces are given a double function. By designing the coupling pieces in such a way that the coupling passes through both the mechanical forces and the electric current, several conceivable advantages are obtained. In a special embodiment there is only one connection between the frame and the module that conducts both the forces and the current, in another embodiment more connections are conceivable, at least one of which has such a double function. Conceivable advantages are the speed and simplicity of installation, but also efficient use of materials by applying the dual function.

The invention is explained below with reference to a number of exemplary embodiments, with reference to the drawings.

Show in the drawings

FIG. 1 shows a first embodiment of a photovoltaic device according to the invention in perspective view, FIG. 2 schematically shows a second embodiment of a photovoltaic device according to the invention in top view,

FIG. 3 shows a third embodiment of a photovoltaic device according to the invention in perspective view,

FIG. Fig. 4 shows a detail of the device shown in Fig. 3 in perspective view, 5 shows an embodiment of a coupling body according to the invention for a device shown in FIG. 1 in perspective view, and FIG. 6 shows the coupling body shown in FIG. 5 in a cross-section.

-λ η o λ c o 1 6

In the drawings, corresponding parts are designated by the same reference numerals.

FIG. 1 shows a photovoltaic device 1, composed of photovoltaic modules 2 with a flat laminar structure, wherein a number of photovoltaic cells (not shown) connected in series 5 are arranged in a known manner between a bottom plate and a transparent plastic plate or glass plate. The modules 2 are attached by means of coupling pieces 5 to aluminum support beams 3, 4, which are electrically isolated from each other and the environment. The modules 2 are each provided with one electrically positive and one electrically negative contact point, which contact points (not shown) are connected via one of the coupling pieces 5 to the respective carriers 3, 4, which thus function as positive 3 and negative 4 current conductors for the modules connected in parallel 2.

FIG. 2 shows a photovoltaic device 6 that differs from the device 1 shown in FIG. 1 in that the parallel aluminum support beams act alternatively as a positive 3 or (grounded) negative 4 current conductor, with current being taken from two adjacent conductors 3, 4 via an inverter 7.

FIG. 3 shows a photovoltaic device 8 on the roof 9 of a building that differs from the device 1 shown in FIG. 1 in that the parallel carrier beams that act as positive 3 or negative 4 current conductors are integrated in one beam. One of the current conductors 4 and a third carrier beam 10, electrically insulated from the modules 2, parallel to the conductor beams 3, 4 and at a distance therefrom much larger than the mutual distance between the conductor beams 3, 4, provide the necessary mechanical stability to the device. The negative and positive contact points of the modules 2 are connected to the conductor beams 3, 4 by means of coupling pieces 12 (shown in Fig. 4) designed for this purpose. Such an embodiment offers the possibility of directing the carrier beams 4, 10, i.e. without electrical insulation, to attach a steel bottom frame, whereby the electrically conductive support beam 4 is grounded. The advantages of this device 8 are the possibility of directly coupling an inverter, i.e. without strip connections, to the conductor beams 3, 4, the possibility of intermingling modules 2 of different length but with the same voltage (of course the distance between the carrier beam 10 and the conductor beams 3, 4 must be adjusted) and the possibility of mounting the device 8 on a steel bottom frame, which is important in connection with protection against lightning strikes. Because the positive 3 and negative conductor beams 4 are close to each other, the alignment of the carrier beams 4, 10 during installation of the device is less critical, while a device once installed is less susceptible to malfunctions due to thermal expansion.

FIG. 4 shows the circled part IV of FIG. 3 in more detail. The positive electrical conductor beam 3 is included between the upright long sides of a U-shaped plastic profile 11, which is fixed with its short side on the positive conductor beam 4.

FIG. 5 shows a coupling piece 5 of a fiber-reinforced plastic material, which is coupled to an aluminum support tube 3, 4 and which serves to attach a module with a laminar structure (not shown) and to conduct current. The carrier tube 3, 4 is mounted on a plastic base 13 in which a screw hole 14 is provided for the purpose of mounting the profile 3, 4 at a place intended for this purpose. The coupling piece 5 has a U-shaped slot 20 on its top side, parallel to the support tube 3, 4, the opening of which extends parallel to the support tube 3, 4, for receiving an edge zone of a module (not shown) . The carrier tube 3, 4 and the coupling piece 5 are provided with interlocking respective claw-shaped edge profiles 15, 16. A compression spring 17, 20 provided with a pressure element 19 supported on the upper surface 18 of the carrier tube 3, 4 for the intermediate element 18 and that pressure element 19 encloses, under the force supplied by compression spring 17, a contact strip (not shown) of a flexible electrically conductive material connected to the relevant module. The compression spring exerts a force on its upper side on a half ring 21 pivotally attached to the coupling piece 5 for pressing a module received in the U-slot 20. Aperture 22 in the upper side of the coupling piece 5 serves to receive a retaining spring after placing a module in the slot 20.

FIG. 6 shows the coupling piece 5 on the carrier tube 3,4 from FIG. 5 in a view transverse to the carrier tube 3,4. The outer walls 23 of the coupling piece 5 have a wedge-shaped and rounded shape on their underside 30, which serves to protect the edge profiles 16 when the coupling piece 15 is placed on the support tube 3,4.

It is emphasized that the exemplary embodiments described serve to illustrate the invention, not to limit it. Within the scope of the invention, a wide variety of embodiments can be realized by the person skilled in the art. It is, for example, possible to provide the carrier bodies in the form of round tubes, on which the modules are clamped with clamping bodies which are provided with a transverse ring-shaped and partially open resilient contact, the inner dimensions S of which correspond to the outer dimensions of the tubes. It is also possible, for the purpose of mechanical attachment of and electrical contact with the modules, to provide the carrier bodies with bushes and to provide the modules with plugs cooperating with these bushes.

10 Below is a legend for the numbers in the figures: 1. photovoltaic device 2. photovoltaic modules 3. positive conductor and / or carrier 4. negative conductor and / or carrier 15 5. coupling piece 6. photovoltaic device 7. inverter 8. photovoltaic device 9. roof 20 10. carrier beam 11. U-profile 12. coupling piece 13. base 14. screw hole 25 15. claw-shaped edge profile 16. claw-shaped edge profile 17. compression spring 18. upper surface 19. pressure element 30 20. U-shaped slot 21. washer 22. opening 23. outer walls »1021591

Claims (16)

  1. Device (1, 6, 8) with which sunlight can be converted into electricity, which consists of at least one photovoltaic module (2), which is attached to a frame, characterized in that this frame also has a function as a conductor of (a part of) the electricity generated by the modules.
  2. A photovoltaic device (1, 6, 8) according to claim 1, comprising one or more photovoltaic modules (2) attached to a frame, which frame comprises at least one carrier body which partly consists of electrically conductive material (3, 4), characterized in that at least one carrier body (3, 4) can be electrically coupled to at least one module and acts as a conductor of (a part of) the current generated by said at least one module.
  3. 3. Device as claimed in claim 1 or 2, characterized in that at least one carrier body comprises at least two conductors (3, 4) which are electrically insulated relative to each other.
  4. Device as claimed in any of the claims 1-3, characterized in that at least one conductor, with which the current generated by the modules is led to the inverter, also at least 90%, in particular 30% and more in particular 10% of passes on the forces on one module.
  5. Device as claimed in claims 2, 3 or 4, comprising at least one carrier body and wherein each module is provided with at least one positive contact point and at least one negative contact point, characterized in that at least one carrier body has at least two conductors insulated from each other and that at least one positive contact point of each module is electrically connectable with at least one conductor and at least one negative contact point is electrically connectable with at least one other conductor.
  6. Device as claimed in any of the foregoing claims, characterized in that the modules are secured with at least one connection that conducts both electrical current and structural forces from the module to the carrier.
  7. Device (1, 6, 8) according to one of the above claims, characterized in that at least one carrier body (3, 4) is substantially of aluminum. 1021591 V111111111111 V111V11V11 V11V11V11 V11V11 / V11V11 V11V11V V11 V11V11 V1111 V1111 V11 V1111 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11 V11?
  8. Device (1,6, 8) according to one of claims 1 to 8, characterized in that at least one electrical contact point of each of the modules (2) is provided by a flexible electrically conductive material, in particular in the shape of a strip.
  9. Device (1,6,8) according to claim 9, characterized in that the flexible conductive material comprises a layer of aluminum provided on a plastic film.
  10. Device (1, 6, 8) according to claims 9 or 10, characterized in that the plastic film is substantially of polyethylene or polyester.
  11. Device (1, 6, 8) according to one of claims 1 to 11, wherein modules (2) extending at least in one direction have a flat laminar structure, characterized in that the modules are on the carrier bodies (3, 4) attached by coupling members clamped around an edge zone of the respective modules (2).
  12. Device (1) according to one of claims 1 to 12, characterized in that the coupling bodies (5) are each clamped around the respective edge zone under a force supplied by a spring (17).
  13. Device (1) as claimed in any of the claims 12 or 13, characterized in that the coupling bodies (5) and the carrier bodies (3, 4) are provided with interlocking claw-shaped edge profiles (15, 16) for fixing the coupling bodies (5) on the respective carrier bodies (3,4).
  14. Device (1) according to claims 12 or 13, characterized in that the respective claw-shaped edge profiles (15, 16) engage under a force supplied by a spring (17).
  15. Device (1) according to claims 12 or 13, characterized in that the coupling bodies (5) are each clamped around the respective edge zone under a force supplied by a spring (17) and the coupling bodies (5) and the carrier bodies (3, 4) are provided with interlocking claw-shaped edge profiles (15, 16) under a force supplied by the compression spring (17) for attaching the coupling bodies 30 (5) to the respective carrier bodies.
  16. Device (1) according to one of claims 15-16, characterized in that the coupling body (5) is provided with a pressing element (19) which can be supported on a surface of a carrier body (3, 4) for the intermediate element between that surface and in that P1 021 5 9 1 press element (19) confines under a force supplied by the spring (17) a strip of a flexible electrically conductive material provided as the contact point of a photovoltaic module (2). 5 .......... - 1 OQ1 C Q 1
NL1021591A 2002-10-05 2002-10-05 Photovoltaic device has photovoltaic modules secured to frame acting as conductor for current generated NL1021591C2 (en)

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NL1021591 2002-10-05

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WO2008098279A1 (en) * 2007-02-15 2008-08-21 The Australian National University A substrate assembly, an assembly process, and an assembly apparatus
US8174856B2 (en) 2011-04-27 2012-05-08 Solarbridge Technologies, Inc. Configurable power supply assembly
US8279649B2 (en) 2010-10-11 2012-10-02 Solarbridge Technologies, Inc. Apparatus and method for controlling a power inverter
US8284574B2 (en) 2011-10-17 2012-10-09 Solarbridge Technologies, Inc. Method and apparatus for controlling an inverter using pulse mode control
US8325499B2 (en) 2007-10-11 2012-12-04 Solarbridge Technologies, Inc. Methods for minimizing double-frequency ripple power in single-phase power conditioners
US8350411B2 (en) 2006-12-22 2013-01-08 Solarbridge Technologies, Inc. Modular system for unattended energy generation and storage
US8462518B2 (en) 2009-10-12 2013-06-11 Solarbridge Technologies, Inc. Power inverter docking system for photovoltaic modules
US8503200B2 (en) 2010-10-11 2013-08-06 Solarbridge Technologies, Inc. Quadrature-corrected feedforward control apparatus and method for DC-AC power conversion
US8611107B2 (en) 2011-04-27 2013-12-17 Solarbridge Technologies, Inc. Method and system for controlling a multi-stage power inverter
US8824178B1 (en) 2009-12-31 2014-09-02 Solarbridge Technologies, Inc. Parallel power converter topology
US8842454B2 (en) 2010-11-29 2014-09-23 Solarbridge Technologies, Inc. Inverter array with localized inverter control
US8922185B2 (en) 2011-07-11 2014-12-30 Solarbridge Technologies, Inc. Device and method for global maximum power point tracking
US9065354B2 (en) 2011-04-27 2015-06-23 Sunpower Corporation Multi-stage power inverter for power bus communication
US9093919B2 (en) 2009-07-31 2015-07-28 Sunpower Corporation Apparatus for converting direct current to alternating current using a frequency converter
US9160408B2 (en) 2010-10-11 2015-10-13 Sunpower Corporation System and method for establishing communication with an array of inverters
US9276635B2 (en) 2012-06-29 2016-03-01 Sunpower Corporation Device, system, and method for communicating with a power inverter using power line communications
US9467063B2 (en) 2010-11-29 2016-10-11 Sunpower Corporation Technologies for interleaved control of an inverter array
US9564835B2 (en) 2013-03-15 2017-02-07 Sunpower Corporation Inverter communications using output signal
US9584044B2 (en) 2013-03-15 2017-02-28 Sunpower Corporation Technologies for converter topologies

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US8350411B2 (en) 2006-12-22 2013-01-08 Solarbridge Technologies, Inc. Modular system for unattended energy generation and storage
WO2008098279A1 (en) * 2007-02-15 2008-08-21 The Australian National University A substrate assembly, an assembly process, and an assembly apparatus
US8325499B2 (en) 2007-10-11 2012-12-04 Solarbridge Technologies, Inc. Methods for minimizing double-frequency ripple power in single-phase power conditioners
US9225256B2 (en) 2009-07-31 2015-12-29 Sunpower Corporation Apparatus and method for controlling DC-AC power conversion
US9093919B2 (en) 2009-07-31 2015-07-28 Sunpower Corporation Apparatus for converting direct current to alternating current using a frequency converter
US8929094B2 (en) 2009-10-12 2015-01-06 Solarbridge Technologies, Inc. Power inverter docking system for photovoltaic modules
US8462518B2 (en) 2009-10-12 2013-06-11 Solarbridge Technologies, Inc. Power inverter docking system for photovoltaic modules
US8824178B1 (en) 2009-12-31 2014-09-02 Solarbridge Technologies, Inc. Parallel power converter topology
US8817510B2 (en) 2010-10-11 2014-08-26 Solarbridge Technologies, Inc. Apparatus and method for controlling a power inverter
US10483795B2 (en) 2010-10-11 2019-11-19 Enphase Energy, Inc. System and method for establishing communication with an array of inverters
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